362 lines
16 KiB
Mathematica
362 lines
16 KiB
Mathematica
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//
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// JXPagerSmoothView.m
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// JXPagerViewExample-OC
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//
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// Created by jiaxin on 2019/11/15.
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// Copyright © 2019 jiaxin. All rights reserved.
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//
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#import "JXPagerSmoothView.h"
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static NSString *JXPagerSmoothViewCollectionViewCellIdentifier = @"cell";
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@interface JXPagerSmoothCollectionView : UICollectionView <UIGestureRecognizerDelegate>
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@property (nonatomic, strong) UIView *pagerHeaderContainerView;
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@end
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@implementation JXPagerSmoothCollectionView
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- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldReceiveTouch:(UITouch *)touch {
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CGPoint point = [touch locationInView:self.pagerHeaderContainerView];
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if (CGRectContainsPoint(self.pagerHeaderContainerView.bounds, point)) {
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return NO;
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}
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return YES;
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}
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@end
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@interface JXPagerSmoothView () <UICollectionViewDataSource, UICollectionViewDelegateFlowLayout>
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@property (nonatomic, weak) id<JXPagerSmoothViewDataSource> dataSource;
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@property (nonatomic, strong) JXPagerSmoothCollectionView *listCollectionView;
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@property (nonatomic, strong) NSMutableDictionary <NSNumber *, id<JXPagerSmoothViewListViewDelegate>> *listDict;
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@property (nonatomic, strong) NSMutableDictionary <NSNumber *, UIView*> *listHeaderDict;
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@property (nonatomic, assign, getter=isSyncListContentOffsetEnabled) BOOL syncListContentOffsetEnabled;
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@property (nonatomic, strong) UIView *pagerHeaderContainerView;
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@property (nonatomic, assign) CGFloat currentPagerHeaderContainerViewY;
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@property (nonatomic, assign) NSInteger currentIndex;
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@property (nonatomic, strong) UIScrollView *currentListScrollView;
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@property (nonatomic, assign) CGFloat heightForPagerHeader;
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@property (nonatomic, assign) CGFloat heightForPinHeader;
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@property (nonatomic, assign) CGFloat heightForPagerHeaderContainerView;
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@property (nonatomic, assign) CGFloat currentListInitializeContentOffsetY;
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@property (nonatomic, strong) UIScrollView *singleScrollView;
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@end
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@implementation JXPagerSmoothView
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- (void)dealloc
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{
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for (id<JXPagerSmoothViewListViewDelegate> list in self.listDict.allValues) {
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[[list listScrollView] removeObserver:self forKeyPath:@"contentOffset"];
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[[list listScrollView] removeObserver:self forKeyPath:@"contentSize"];
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}
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}
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- (instancetype)initWithDataSource:(id<JXPagerSmoothViewDataSource>)dataSource
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{
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self = [super initWithFrame:CGRectZero];
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if (self) {
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_dataSource = dataSource;
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_listDict = [NSMutableDictionary dictionary];
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_listHeaderDict = [NSMutableDictionary dictionary];
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[self initializeViews];
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}
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return self;
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}
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- (void)initializeViews {
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self.pagerHeaderContainerView = [[UIView alloc] init];
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UICollectionViewFlowLayout *layout = [[UICollectionViewFlowLayout alloc] init];
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layout.scrollDirection = UICollectionViewScrollDirectionHorizontal;
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layout.minimumLineSpacing = 0;
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layout.minimumInteritemSpacing = 0;
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_listCollectionView = [[JXPagerSmoothCollectionView alloc] initWithFrame:CGRectZero collectionViewLayout:layout];
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self.listCollectionView.dataSource = self;
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self.listCollectionView.delegate = self;
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self.listCollectionView.pagingEnabled = YES;
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self.listCollectionView.bounces = NO;
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self.listCollectionView.showsHorizontalScrollIndicator = NO;
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self.listCollectionView.scrollsToTop = NO;
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[self.listCollectionView registerClass:[UICollectionViewCell class] forCellWithReuseIdentifier:JXPagerSmoothViewCollectionViewCellIdentifier];
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if (@available(iOS 10.0, *)) {
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self.listCollectionView.prefetchingEnabled = NO;
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}
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if (@available(iOS 11.0, *)) {
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self.listCollectionView.contentInsetAdjustmentBehavior = UIScrollViewContentInsetAdjustmentNever;
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}
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_listCollectionView.pagerHeaderContainerView = self.pagerHeaderContainerView;
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[self addSubview:self.listCollectionView];
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}
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- (void)layoutSubviews {
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[super layoutSubviews];
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self.listCollectionView.frame = self.bounds;
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if (CGRectEqualToRect(self.pagerHeaderContainerView.frame, CGRectZero)) {
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[self reloadData];
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}
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if (self.singleScrollView != nil) {
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self.singleScrollView.frame = self.bounds;
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}
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}
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- (void)reloadData {
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self.currentListScrollView = nil;
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self.currentIndex = self.defaultSelectedIndex;
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self.currentPagerHeaderContainerViewY = 0;
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self.syncListContentOffsetEnabled = NO;
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[self.listHeaderDict removeAllObjects];
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for (id<JXPagerSmoothViewListViewDelegate> list in self.listDict.allValues) {
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[[list listScrollView] removeObserver:self forKeyPath:@"contentOffset"];
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[[list listScrollView] removeObserver:self forKeyPath:@"contentSize"];
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[[list listView] removeFromSuperview];
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}
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[_listDict removeAllObjects];
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self.heightForPagerHeader = [self.dataSource heightForPagerHeaderInPagerView:self];
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self.heightForPinHeader = [self.dataSource heightForPinHeaderInPagerView:self];
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self.heightForPagerHeaderContainerView = self.heightForPagerHeader + self.heightForPinHeader;
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UIView *pagerHeader = [self.dataSource viewForPagerHeaderInPagerView:self];
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UIView *pinHeader = [self.dataSource viewForPinHeaderInPagerView:self];
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[self.pagerHeaderContainerView addSubview:pagerHeader];
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[self.pagerHeaderContainerView addSubview:pinHeader];
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self.pagerHeaderContainerView.frame = CGRectMake(0, 0, self.bounds.size.width, self.heightForPagerHeaderContainerView);
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pagerHeader.frame = CGRectMake(0, 0, self.bounds.size.width, self.heightForPagerHeader);
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pinHeader.frame = CGRectMake(0, self.heightForPagerHeader, self.bounds.size.width, self.heightForPinHeader);
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[self.listCollectionView setContentOffset:CGPointMake(self.listCollectionView.bounds.size.width*self.defaultSelectedIndex, 0) animated:NO];
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[self.listCollectionView reloadData];
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if ([self.dataSource numberOfListsInPagerView:self] == 0) {
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self.singleScrollView = [[UIScrollView alloc] init];
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[self addSubview:self.singleScrollView];
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[self.singleScrollView addSubview:pagerHeader];
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self.singleScrollView.contentSize = CGSizeMake(self.bounds.size.width, self.heightForPagerHeader);
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}else if (self.singleScrollView != nil) {
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[self.singleScrollView removeFromSuperview];
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self.singleScrollView = nil;
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}
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}
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#pragma mark - UICollectionViewDataSource & UICollectionViewDelegateFlowLayout
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- (CGSize)collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout*)collectionViewLayout sizeForItemAtIndexPath:(NSIndexPath *)indexPath {
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return self.bounds.size;
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}
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- (NSInteger)collectionView:(UICollectionView *)collectionView numberOfItemsInSection:(NSInteger)section {
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return [self.dataSource numberOfListsInPagerView:self];
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}
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- (UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath {
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UICollectionViewCell *cell = [collectionView dequeueReusableCellWithReuseIdentifier:JXPagerSmoothViewCollectionViewCellIdentifier forIndexPath:indexPath];
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id<JXPagerSmoothViewListViewDelegate> list = self.listDict[@(indexPath.item)];
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if (list == nil) {
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list = [self.dataSource pagerView:self initListAtIndex:indexPath.item];
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_listDict[@(indexPath.item)] = list;
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[[list listView] setNeedsLayout];
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[[list listView] layoutIfNeeded];
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UIScrollView *listScrollView = [list listScrollView];
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if ([listScrollView isKindOfClass:[UITableView class]]) {
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((UITableView *)listScrollView).estimatedRowHeight = 0;
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((UITableView *)listScrollView).estimatedSectionFooterHeight = 0;
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((UITableView *)listScrollView).estimatedSectionHeaderHeight = 0;
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}
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if (@available(iOS 11.0, *)) {
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listScrollView.contentInsetAdjustmentBehavior = UIScrollViewContentInsetAdjustmentNever;
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}
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listScrollView.contentInset = UIEdgeInsetsMake(self.heightForPagerHeaderContainerView, 0, 0, 0);
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self.currentListInitializeContentOffsetY = -listScrollView.contentInset.top + MIN(-self.currentPagerHeaderContainerViewY, self.heightForPagerHeader);
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listScrollView.contentOffset = CGPointMake(0, self.currentListInitializeContentOffsetY);
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UIView *listHeader = [[UIView alloc] initWithFrame:CGRectMake(0, -self.heightForPagerHeaderContainerView, self.bounds.size.width, self.heightForPagerHeaderContainerView)];
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[listScrollView addSubview:listHeader];
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if (self.pagerHeaderContainerView.superview == nil) {
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[listHeader addSubview:self.pagerHeaderContainerView];
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}
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self.listHeaderDict[@(indexPath.item)] = listHeader;
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[listScrollView addObserver:self forKeyPath:@"contentOffset" options:NSKeyValueObservingOptionNew context:nil];
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[listScrollView addObserver:self forKeyPath:@"contentSize" options:NSKeyValueObservingOptionNew context:nil];
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}
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for (id<JXPagerSmoothViewListViewDelegate> listItem in self.listDict.allValues) {
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[listItem listScrollView].scrollsToTop = (listItem == list);
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}
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UIView *listView = [list listView];
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if (listView != nil && listView.superview != cell.contentView) {
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for (UIView *view in cell.contentView.subviews) {
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[view removeFromSuperview];
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}
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listView.frame = cell.contentView.bounds;
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[cell.contentView addSubview:listView];
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}
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return cell;
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}
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- (void)collectionView:(UICollectionView *)collectionView willDisplayCell:(UICollectionViewCell *)cell forItemAtIndexPath:(NSIndexPath *)indexPath {
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[self listDidAppear:indexPath.item];
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}
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- (void)collectionView:(UICollectionView *)collectionView didEndDisplayingCell:(UICollectionViewCell *)cell forItemAtIndexPath:(NSIndexPath *)indexPath {
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[self listDidDisappear:indexPath.item];
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}
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- (void)scrollViewDidScroll:(UIScrollView *)scrollView {
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if (self.delegate && [self.delegate respondsToSelector:@selector(pagerSmoothViewDidScroll:)]) {
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[self.delegate pagerSmoothViewDidScroll:scrollView];
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}
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CGFloat indexPercent = scrollView.contentOffset.x/scrollView.bounds.size.width;
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NSInteger index = floor(indexPercent);
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UIScrollView *listScrollView = [self.listDict[@(index)] listScrollView];
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if (indexPercent - index == 0 && index != self.currentIndex && !(scrollView.isDragging || scrollView.isDecelerating) && listScrollView.contentOffset.y <= -self.heightForPinHeader) {
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[self horizontalScrollDidEndAtIndex:index];
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}else {
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//左右滚动的时候，就把listHeaderContainerView添加到self，达到悬浮在顶部的效果
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if (self.pagerHeaderContainerView.superview != self) {
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self.pagerHeaderContainerView.frame = CGRectMake(0, self.currentPagerHeaderContainerViewY, self.pagerHeaderContainerView.bounds.size.width, self.pagerHeaderContainerView.bounds.size.height);
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[self addSubview:self.pagerHeaderContainerView];
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}
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}
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if (index != self.currentIndex) {
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self.currentIndex = index;
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}
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}
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- (void)scrollViewDidEndDragging:(UIScrollView *)scrollView willDecelerate:(BOOL)decelerate {
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if (!decelerate) {
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NSInteger index = scrollView.contentOffset.x/scrollView.bounds.size.width;
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[self horizontalScrollDidEndAtIndex:index];
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}
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}
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- (void)scrollViewDidEndDecelerating:(UIScrollView *)scrollView {
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NSInteger index = scrollView.contentOffset.x/scrollView.bounds.size.width;
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[self horizontalScrollDidEndAtIndex:index];
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}
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#pragma mark - KVO
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- (void)observeValueForKeyPath:(NSString *)keyPath ofObject:(id)object change:(NSDictionary<NSKeyValueChangeKey,id> *)change context:(void *)context {
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if ([keyPath isEqualToString:@"contentOffset"]) {
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UIScrollView *scrollView = (UIScrollView *)object;
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if (scrollView != nil) {
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[self listDidScroll:scrollView];
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}
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}else if([keyPath isEqualToString:@"contentSize"]) {
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UIScrollView *scrollView = (UIScrollView *)object;
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if (scrollView != nil) {
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CGFloat minContentSizeHeight = self.bounds.size.height - self.heightForPinHeader;
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if (minContentSizeHeight > scrollView.contentSize.height) {
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scrollView.contentSize = CGSizeMake(scrollView.contentSize.width, minContentSizeHeight);
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//新的scrollView第一次加载的时候重置contentOffset
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if (_currentListScrollView != nil && scrollView != _currentListScrollView) {
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scrollView.contentOffset = CGPointMake(0, self.currentListInitializeContentOffsetY);
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}
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}
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}
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}else {
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[super observeValueForKeyPath:keyPath ofObject:object change:change context:context];
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}
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}
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#pragma mark - Event
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- (void)listDidScroll:(UIScrollView *)scrollView {
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if (self.listCollectionView.isDragging || self.listCollectionView.isDecelerating) {
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return;
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}
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NSInteger listIndex = [self listIndexForListScrollView:scrollView];
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if (listIndex != self.currentIndex) {
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return;
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}
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self.currentListScrollView = scrollView;
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CGFloat contentOffsetY = scrollView.contentOffset.y + self.heightForPagerHeaderContainerView;
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if (contentOffsetY < self.heightForPagerHeader) {
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self.syncListContentOffsetEnabled = YES;
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self.currentPagerHeaderContainerViewY = -contentOffsetY;
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for (id<JXPagerSmoothViewListViewDelegate> list in self.listDict.allValues) {
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if ([list listScrollView] != self.currentListScrollView) {
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[[list listScrollView] setContentOffset:scrollView.contentOffset animated:NO];
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}
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}
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UIView *listHeader = [self listHeaderForListScrollView:scrollView];
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if (self.pagerHeaderContainerView.superview != listHeader) {
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self.pagerHeaderContainerView.frame = CGRectMake(0, 0, self.pagerHeaderContainerView.bounds.size.width, self.pagerHeaderContainerView.bounds.size.height);
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[listHeader addSubview:self.pagerHeaderContainerView];
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}
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}else {
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if (self.pagerHeaderContainerView.superview != self) {
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self.pagerHeaderContainerView.frame = CGRectMake(0, -self.heightForPagerHeader, self.pagerHeaderContainerView.bounds.size.width, self.pagerHeaderContainerView.bounds.size.height);
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[self addSubview:self.pagerHeaderContainerView];
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}
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if (self.isSyncListContentOffsetEnabled) {
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self.syncListContentOffsetEnabled = NO;
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self.currentPagerHeaderContainerViewY = -self.heightForPagerHeader;
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for (id<JXPagerSmoothViewListViewDelegate> list in self.listDict.allValues) {
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if ([list listScrollView] != scrollView) {
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[[list listScrollView] setContentOffset:CGPointMake(0, -self.heightForPinHeader) animated:NO];
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}
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}
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}
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}
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}
|
|||
|
|
|
|||
|
|
#pragma mark - Private
|
|||
|
|
|
|||
|
|
- (UIView *)listHeaderForListScrollView:(UIScrollView *)scrollView {
|
|||
|
|
for (NSNumber *index in self.listDict) {
|
|||
|
|
if ([self.listDict[index] listScrollView] == scrollView) {
|
|||
|
|
return self.listHeaderDict[index];
|
|||
|
|
}
|
|||
|
|
}
|
|||
|
|
return nil;
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
- (NSInteger)listIndexForListScrollView:(UIScrollView *)scrollView {
|
|||
|
|
for (NSNumber *index in self.listDict) {
|
|||
|
|
if ([self.listDict[index] listScrollView] == scrollView) {
|
|||
|
|
return [index integerValue];
|
|||
|
|
}
|
|||
|
|
}
|
|||
|
|
return 0;
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
- (void)listDidAppear:(NSInteger)index {
|
|||
|
|
NSUInteger count = [self.dataSource numberOfListsInPagerView:self];
|
|||
|
|
if (count <= 0 || index >= count) {
|
|||
|
|
return;
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
id<JXPagerSmoothViewListViewDelegate> list = self.listDict[@(index)];
|
|||
|
|
if (list && [list respondsToSelector:@selector(listDidAppear)]) {
|
|||
|
|
[list listDidAppear];
|
|||
|
|
}
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
- (void)listDidDisappear:(NSInteger)index {
|
|||
|
|
NSUInteger count = [self.dataSource numberOfListsInPagerView:self];
|
|||
|
|
if (count <= 0 || index >= count) {
|
|||
|
|
return;
|
|||
|
|
}
|
|||
|
|
id<JXPagerSmoothViewListViewDelegate> list = self.listDict[@(index)];
|
|||
|
|
if (list && [list respondsToSelector:@selector(listDidDisappear)]) {
|
|||
|
|
[list listDidDisappear];
|
|||
|
|
}
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
/// 列表左右切换滚动结束之后，需要把pagerHeaderContainerView添加到当前index的列表上面
|
|||
|
|
- (void)horizontalScrollDidEndAtIndex:(NSInteger)index {
|
|||
|
|
self.currentIndex = index;
|
|||
|
|
UIView *listHeader = self.listHeaderDict[@(index)];
|
|||
|
|
UIScrollView *listScrollView = [self.listDict[@(index)] listScrollView];
|
|||
|
|
if (listHeader != nil && listScrollView.contentOffset.y <= -self.heightForPinHeader) {
|
|||
|
|
for (id<JXPagerSmoothViewListViewDelegate> listItem in self.listDict.allValues) {
|
|||
|
|
[listItem listScrollView].scrollsToTop = ([listItem listScrollView] == listScrollView);
|
|||
|
|
}
|
|||
|
|
self.pagerHeaderContainerView.frame = CGRectMake(0, 0, self.pagerHeaderContainerView.bounds.size.width, self.pagerHeaderContainerView.bounds.size.height);
|
|||
|
|
[listHeader addSubview:self.pagerHeaderContainerView];
|
|||
|
|
}
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
@end
|