410 lines
19 KiB
Objective-C
410 lines
19 KiB
Objective-C
//
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// JXPagerView.m
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// JXPagerView
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//
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// Created by jiaxin on 2018/8/27.
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// Copyright © 2018年 jiaxin. All rights reserved.
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//
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#import "JXPagerView.h"
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@class JXPagerListContainerScrollView;
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@class JXPagerListContainerCollectionView;
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@interface JXPagerView () <UITableViewDataSource, UITableViewDelegate, JXPagerListContainerViewDelegate>
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@property (nonatomic, weak) id<JXPagerViewDelegate> delegate;
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@property (nonatomic, strong) JXPagerMainTableView *mainTableView;
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@property (nonatomic, strong) JXPagerListContainerView *listContainerView;
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@property (nonatomic, strong) UIScrollView *currentScrollingListView;
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@property (nonatomic, strong) id<JXPagerViewListViewDelegate> currentList;
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@property (nonatomic, strong) NSMutableDictionary <NSNumber *, id<JXPagerViewListViewDelegate>> *validListDict;
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@property (nonatomic, strong) UIView *tableHeaderContainerView;
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@property (nonatomic, strong) NSMutableDictionary<NSString *, id<JXPagerViewListViewDelegate>> *listCache;
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@end
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@implementation JXPagerView
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- (instancetype)initWithDelegate:(id<JXPagerViewDelegate>)delegate {
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return [self initWithDelegate:delegate listContainerType:JXPagerListContainerType_CollectionView];
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}
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- (instancetype)initWithDelegate:(id<JXPagerViewDelegate>)delegate listContainerType:(JXPagerListContainerType)type {
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self = [super initWithFrame:CGRectZero];
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if (self) {
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_delegate = delegate;
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_validListDict = [NSMutableDictionary dictionary];
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_automaticallyDisplayListVerticalScrollIndicator = YES;
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_isListHorizontalScrollEnabled = YES;
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_mainTableView = [[JXPagerMainTableView alloc] initWithFrame:CGRectZero style:UITableViewStylePlain];
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self.mainTableView.showsVerticalScrollIndicator = NO;
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self.mainTableView.showsHorizontalScrollIndicator = NO;
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self.mainTableView.separatorStyle = UITableViewCellSeparatorStyleNone;
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self.mainTableView.scrollsToTop = NO;
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self.mainTableView.dataSource = self;
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self.mainTableView.delegate = self;
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[self refreshTableHeaderView];
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[self.mainTableView registerClass:[UITableViewCell class] forCellReuseIdentifier:@"cell"];
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if (@available(iOS 11.0, *)) {
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self.mainTableView.contentInsetAdjustmentBehavior = UIScrollViewContentInsetAdjustmentNever;
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}
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#if __IPHONE_OS_VERSION_MAX_ALLOWED >= 150000
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if (@available(iOS 15.0, *)) {
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self.mainTableView.sectionHeaderTopPadding = 0;
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}
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#endif
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[self addSubview:self.mainTableView];
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_listContainerView = [[JXPagerListContainerView alloc] initWithType:type delegate:self];
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}
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return self;
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}
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- (void)layoutSubviews {
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[super layoutSubviews];
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if (!CGRectEqualToRect(self.bounds, self.mainTableView.frame)) {
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self.mainTableView.frame = self.bounds;
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[self.mainTableView reloadData];
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}
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}
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- (void)setDefaultSelectedIndex:(NSInteger)defaultSelectedIndex {
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_defaultSelectedIndex = defaultSelectedIndex;
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self.listContainerView.defaultSelectedIndex = defaultSelectedIndex;
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}
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- (void)setIsListHorizontalScrollEnabled:(BOOL)isListHorizontalScrollEnabled {
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_isListHorizontalScrollEnabled = isListHorizontalScrollEnabled;
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self.listContainerView.scrollView.scrollEnabled = isListHorizontalScrollEnabled;
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}
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- (void)reloadData {
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self.currentList = nil;
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self.currentScrollingListView = nil;
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[_validListDict removeAllObjects];
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//根据新数据删除不需要的list
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if (self.allowsCacheList) {
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NSMutableArray *newListIdentifierArray = [NSMutableArray array];
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if (self.delegate && [self.delegate respondsToSelector:@selector(numberOfListsInPagerView:)]) {
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NSInteger listCount = [self.delegate numberOfListsInPagerView:self];
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for (NSInteger index = 0; index < listCount; index ++) {
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if (self.delegate && [self.delegate respondsToSelector:@selector(pagerView:listIdentifierAtIndex:)]) {
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NSString *listIdentifier = [self.delegate pagerView:self listIdentifierAtIndex:index];
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[newListIdentifierArray addObject:listIdentifier];
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}
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}
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}
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NSArray *existedKeys = self.listCache.allKeys;
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for (NSString *listIdentifier in existedKeys) {
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if (![newListIdentifierArray containsObject:listIdentifier]) {
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[self.listCache removeObjectForKey:listIdentifier];
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}
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}
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}
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[self refreshTableHeaderView];
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if (self.pinSectionHeaderVerticalOffset != 0 && self.mainTableView.contentOffset.y > self.pinSectionHeaderVerticalOffset) {
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self.mainTableView.contentOffset = CGPointZero;
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}
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[self.mainTableView reloadData];
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[self.listContainerView reloadData];
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}
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- (void)resizeTableHeaderViewHeightWithAnimatable:(BOOL)animatable duration:(NSTimeInterval)duration curve:(UIViewAnimationCurve)curve {
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if (animatable) {
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UIViewAnimationOptions options = UIViewAnimationOptionCurveLinear;
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switch (curve) {
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case UIViewAnimationCurveEaseIn: options = UIViewAnimationOptionCurveEaseIn; break;
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case UIViewAnimationCurveEaseOut: options = UIViewAnimationOptionCurveEaseOut; break;
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case UIViewAnimationCurveEaseInOut: options = UIViewAnimationOptionCurveEaseInOut; break;
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default: break;
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}
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[UIView animateWithDuration:duration delay:0 options:options animations:^{
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CGRect frame = self.tableHeaderContainerView.bounds;
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frame.size.height = [self.delegate tableHeaderViewHeightInPagerView:self];
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self.tableHeaderContainerView.frame = frame;
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self.mainTableView.tableHeaderView = self.tableHeaderContainerView;
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[self.mainTableView setNeedsLayout];
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[self.mainTableView layoutIfNeeded];
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} completion:^(BOOL finished) { }];
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}else {
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CGRect frame = self.tableHeaderContainerView.bounds;
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frame.size.height = [self.delegate tableHeaderViewHeightInPagerView:self];
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self.tableHeaderContainerView.frame = frame;
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self.mainTableView.tableHeaderView = self.tableHeaderContainerView;
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}
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}
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#pragma mark - Private
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- (void)refreshTableHeaderView {
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UIView *tableHeaderView = [self.delegate tableHeaderViewInPagerView:self];
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UIView *containerView = [[UIView alloc] initWithFrame:CGRectMake(0, 0, 0, [self.delegate tableHeaderViewHeightInPagerView:self])];
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[containerView addSubview:tableHeaderView];
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tableHeaderView.translatesAutoresizingMaskIntoConstraints = NO;
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NSLayoutConstraint *top = [NSLayoutConstraint constraintWithItem:tableHeaderView attribute:NSLayoutAttributeTop relatedBy:NSLayoutRelationEqual toItem:containerView attribute:NSLayoutAttributeTop multiplier:1 constant:0];
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NSLayoutConstraint *leading = [NSLayoutConstraint constraintWithItem:tableHeaderView attribute:NSLayoutAttributeLeading relatedBy:NSLayoutRelationEqual toItem:containerView attribute:NSLayoutAttributeLeading multiplier:1 constant:0];
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NSLayoutConstraint *bottom = [NSLayoutConstraint constraintWithItem:tableHeaderView attribute:NSLayoutAttributeBottom relatedBy:NSLayoutRelationEqual toItem:containerView attribute:NSLayoutAttributeBottom multiplier:1 constant:0];
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NSLayoutConstraint *trailing = [NSLayoutConstraint constraintWithItem:tableHeaderView attribute:NSLayoutAttributeTrailing relatedBy:NSLayoutRelationEqual toItem:containerView attribute:NSLayoutAttributeTrailing multiplier:1 constant:0];
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[containerView addConstraints:@[top, leading, bottom, trailing]];
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self.tableHeaderContainerView = containerView;
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self.mainTableView.tableHeaderView = containerView;
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}
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- (void)adjustMainScrollViewToTargetContentInsetIfNeeded:(UIEdgeInsets)insets {
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if (UIEdgeInsetsEqualToEdgeInsets(insets, self.mainTableView.contentInset) == NO) {
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self.mainTableView.delegate = nil;
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self.mainTableView.contentInset = insets;
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self.mainTableView.delegate = self;
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}
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}
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- (void)listViewDidScroll:(UIScrollView *)scrollView {
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self.currentScrollingListView = scrollView;
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[self preferredProcessListViewDidScroll:scrollView];
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}
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//仅用于处理设置了pinSectionHeaderVerticalOffset，又添加了MJRefresh的下拉刷新。这种情况会导致JXPagingView和MJRefresh来回设置contentInset值。针对这种及其特殊的情况，就内部特殊处理了。通过下面的判断条件，来判定当前是否处于下拉刷新中。请勿让pinSectionHeaderVerticalOffset和下拉刷新设置的contentInset.top值相同。
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//具体原因参考：https://github.com/pujiaxin33/JXPagingView/issues/203
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- (BOOL)isSetMainScrollViewContentInsetToZeroEnabled:(UIScrollView *)scrollView {
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//scrollView.contentInset.top不为0，且scrollView.contentInset.top不等于pinSectionHeaderVerticalOffset，即可认为列表正在刷新。所以这里必须要保证pinSectionHeaderVerticalOffset和MJRefresh的mj_insetT的值不相等。
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BOOL isRefreshing = scrollView.contentInset.top != 0 && scrollView.contentInset.top != self.pinSectionHeaderVerticalOffset;
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return !isRefreshing;
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}
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#pragma mark - UITableViewDataSource, UITableViewDelegate
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- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {
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return 1;
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}
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- (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath {
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return MAX(self.bounds.size.height - [self.delegate heightForPinSectionHeaderInPagerView:self] - self.pinSectionHeaderVerticalOffset, 0);
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}
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- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
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UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:@"cell" forIndexPath:indexPath];
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cell.selectionStyle = UITableViewCellSelectionStyleNone;
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cell.backgroundColor = [UIColor clearColor];
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if (self.listContainerView.superview != cell.contentView) {
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[cell.contentView addSubview:self.listContainerView];
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}
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if (!CGRectEqualToRect(self.listContainerView.frame, cell.bounds)) {
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self.listContainerView.frame = cell.bounds;
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}
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return cell;
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}
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- (CGFloat)tableView:(UITableView *)tableView heightForHeaderInSection:(NSInteger)section {
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return [self.delegate heightForPinSectionHeaderInPagerView:self];
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}
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- (UIView *)tableView:(UITableView *)tableView viewForHeaderInSection:(NSInteger)section {
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return [self.delegate viewForPinSectionHeaderInPagerView:self];
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}
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- (CGFloat)tableView:(UITableView *)tableView heightForFooterInSection:(NSInteger)section {
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return 1;
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}
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- (UIView *)tableView:(UITableView *)tableView viewForFooterInSection:(NSInteger)section {
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UIView *footer = [[UIView alloc] initWithFrame:CGRectZero];
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footer.backgroundColor = [UIColor clearColor];
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return footer;
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}
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- (void)scrollViewDidScroll:(UIScrollView *)scrollView {
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if (self.pinSectionHeaderVerticalOffset != 0) {
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if (!(self.currentScrollingListView != nil && self.currentScrollingListView.contentOffset.y > [self minContentOffsetYInListScrollView:self.currentScrollingListView])) {
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//没有处于滚动某一个listView的状态
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if (scrollView.contentOffset.y >= self.pinSectionHeaderVerticalOffset) {
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//固定的位置就是contentInset.top
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[self adjustMainScrollViewToTargetContentInsetIfNeeded:UIEdgeInsetsMake(self.pinSectionHeaderVerticalOffset, 0, 0, 0)];
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}else {
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if ([self isSetMainScrollViewContentInsetToZeroEnabled:scrollView]) {
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[self adjustMainScrollViewToTargetContentInsetIfNeeded:UIEdgeInsetsZero];
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}
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}
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}
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}
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[self preferredProcessMainTableViewDidScroll:scrollView];
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if (self.delegate && [self.delegate respondsToSelector:@selector(mainTableViewDidScroll:)]) {
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#pragma GCC diagnostic push
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#pragma GCC diagnostic ignored "-Wdeprecated-declarations"
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[self.delegate mainTableViewDidScroll:scrollView];
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#pragma GCC diagnostic pop
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}
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if (self.delegate && [self.delegate respondsToSelector:@selector(pagerView:mainTableViewDidScroll:)]) {
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[self.delegate pagerView:self mainTableViewDidScroll:scrollView];
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}
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}
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- (void)scrollViewWillBeginDragging:(UIScrollView *)scrollView {
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self.listContainerView.scrollView.scrollEnabled = NO;
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if (self.delegate && [self.delegate respondsToSelector:@selector(pagerView:mainTableViewWillBeginDragging:)]) {
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[self.delegate pagerView:self mainTableViewWillBeginDragging:scrollView];
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}
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}
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- (void)scrollViewDidEndDragging:(UIScrollView *)scrollView willDecelerate:(BOOL)decelerate {
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if (self.isListHorizontalScrollEnabled && !decelerate) {
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self.listContainerView.scrollView.scrollEnabled = YES;
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}
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if (self.delegate && [self.delegate respondsToSelector:@selector(pagerView:mainTableViewDidEndDragging:willDecelerate:)]) {
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[self.delegate pagerView:self mainTableViewDidEndDragging:scrollView willDecelerate:decelerate];
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}
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}
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- (void)scrollViewDidEndDecelerating:(UIScrollView *)scrollView {
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if (self.isListHorizontalScrollEnabled) {
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self.listContainerView.scrollView.scrollEnabled = YES;
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}
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if ([self isSetMainScrollViewContentInsetToZeroEnabled:scrollView]) {
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if (self.mainTableView.contentInset.top != 0 && self.pinSectionHeaderVerticalOffset != 0) {
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[self adjustMainScrollViewToTargetContentInsetIfNeeded:UIEdgeInsetsZero];
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}
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}
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if (self.delegate && [self.delegate respondsToSelector:@selector(pagerView:mainTableViewDidEndDecelerating:)]) {
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[self.delegate pagerView:self mainTableViewDidEndDecelerating:scrollView];
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}
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}
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- (void)scrollViewDidEndScrollingAnimation:(UIScrollView *)scrollView {
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if (self.isListHorizontalScrollEnabled) {
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self.listContainerView.scrollView.scrollEnabled = YES;
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}
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if (self.delegate && [self.delegate respondsToSelector:@selector(pagerView:mainTableViewDidEndScrollingAnimation:)]) {
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[self.delegate pagerView:self mainTableViewDidEndScrollingAnimation:scrollView];
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}
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}
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#pragma mark - JXPagerListContainerViewDelegate
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- (NSInteger)numberOfListsInlistContainerView:(JXPagerListContainerView *)listContainerView {
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return [self.delegate numberOfListsInPagerView:self];
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}
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- (id<JXPagerViewListViewDelegate>)listContainerView:(JXPagerListContainerView *)listContainerView initListForIndex:(NSInteger)index {
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id<JXPagerViewListViewDelegate> list = self.validListDict[@(index)];
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if (list == nil) {
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if (self.allowsCacheList && self.delegate && [self.delegate respondsToSelector:@selector(pagerView:listIdentifierAtIndex:)]) {
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NSString *listIdentifier = [self.delegate pagerView:self listIdentifierAtIndex:index];
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list = self.listCache[listIdentifier];
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}
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}
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if (list == nil) {
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list = [self.delegate pagerView:self initListAtIndex:index];
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__weak typeof(self)weakSelf = self;
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__weak typeof(id<JXPagerViewListViewDelegate>) weakList = list;
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[list listViewDidScrollCallback:^(UIScrollView *scrollView) {
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weakSelf.currentList = weakList;
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[weakSelf listViewDidScroll:scrollView];
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}];
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_validListDict[@(index)] = list;
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if (self.allowsCacheList && self.delegate && [self.delegate respondsToSelector:@selector(pagerView:listIdentifierAtIndex:)]) {
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NSString *listIdentifier = [self.delegate pagerView:self listIdentifierAtIndex:index];
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self.listCache[listIdentifier] = list;
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}
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}
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return list;
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}
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- (void)listContainerViewWillBeginDragging:(JXPagerListContainerView *)listContainerView {
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self.mainTableView.scrollEnabled = NO;
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}
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- (void)listContainerViewWDidEndScroll:(JXPagerListContainerView *)listContainerView {
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self.mainTableView.scrollEnabled = YES;
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}
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- (void)listContainerView:(JXPagerListContainerView *)listContainerView listDidAppearAtIndex:(NSInteger)index {
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self.currentScrollingListView = [self.validListDict[@(index)] listScrollView];
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for (id<JXPagerViewListViewDelegate> listItem in self.validListDict.allValues) {
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if (listItem == self.validListDict[@(index)]) {
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[listItem listScrollView].scrollsToTop = YES;
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}else {
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[listItem listScrollView].scrollsToTop = NO;
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}
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}
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}
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- (Class)scrollViewClassInlistContainerView:(JXPagerListContainerView *)listContainerView {
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if (self.delegate && [self.delegate respondsToSelector:@selector(scrollViewClassInlistContainerViewInPagerView:)]) {
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return [self.delegate scrollViewClassInlistContainerViewInPagerView:self];
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}
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return nil;
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}
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@end
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@implementation JXPagerView (UISubclassingGet)
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- (CGFloat)mainTableViewMaxContentOffsetY {
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return [self.delegate tableHeaderViewHeightInPagerView:self] - self.pinSectionHeaderVerticalOffset;
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}
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@end
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@implementation JXPagerView (UISubclassingHooks)
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- (void)preferredProcessListViewDidScroll:(UIScrollView *)scrollView {
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if (self.mainTableView.contentOffset.y < self.mainTableViewMaxContentOffsetY) {
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//mainTableView的header还没有消失，让listScrollView一直为0
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if (self.currentList && [self.currentList respondsToSelector:@selector(listScrollViewWillResetContentOffset)]) {
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[self.currentList listScrollViewWillResetContentOffset];
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}
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[self setListScrollViewToMinContentOffsetY:scrollView];
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if (self.automaticallyDisplayListVerticalScrollIndicator) {
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scrollView.showsVerticalScrollIndicator = NO;
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}
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}else {
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//mainTableView的header刚好消失，固定mainTableView的位置，显示listScrollView的滚动条
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self.mainTableView.contentOffset = CGPointMake(0, self.mainTableViewMaxContentOffsetY);
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if (self.automaticallyDisplayListVerticalScrollIndicator) {
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scrollView.showsVerticalScrollIndicator = YES;
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}
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}
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}
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- (void)preferredProcessMainTableViewDidScroll:(UIScrollView *)scrollView {
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if (self.currentScrollingListView != nil && self.currentScrollingListView.contentOffset.y > [self minContentOffsetYInListScrollView:self.currentScrollingListView]) {
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//mainTableView的header已经滚动不见，开始滚动某一个listView，那么固定mainTableView的contentOffset，让其不动
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[self setMainTableViewToMaxContentOffsetY];
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}
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if (scrollView.contentOffset.y < self.mainTableViewMaxContentOffsetY) {
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//mainTableView已经显示了header，listView的contentOffset需要重置
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for (id<JXPagerViewListViewDelegate> list in self.validListDict.allValues) {
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if ([list respondsToSelector:@selector(listScrollViewWillResetContentOffset)]) {
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[list listScrollViewWillResetContentOffset];
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}
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[self setListScrollViewToMinContentOffsetY:[list listScrollView]];
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}
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}
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if (scrollView.contentOffset.y > self.mainTableViewMaxContentOffsetY && self.currentScrollingListView.contentOffset.y == [self minContentOffsetYInListScrollView:self.currentScrollingListView]) {
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//当往上滚动mainTableView的headerView时，滚动到底时，修复listView往上小幅度滚动
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[self setMainTableViewToMaxContentOffsetY];
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}
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}
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- (void)setMainTableViewToMaxContentOffsetY {
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self.mainTableView.contentOffset = CGPointMake(0, self.mainTableViewMaxContentOffsetY);
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}
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- (void)setListScrollViewToMinContentOffsetY:(UIScrollView *)scrollView {
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scrollView.contentOffset = CGPointMake(scrollView.contentOffset.x, [self minContentOffsetYInListScrollView:scrollView]);
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}
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- (CGFloat)minContentOffsetYInListScrollView:(UIScrollView *)scrollView {
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if (@available(iOS 11.0, *)) {
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return -scrollView.adjustedContentInset.top;
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}
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return -scrollView.contentInset.top;
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}
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@end
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