解決問題:
UICollectionView下巢狀UITableView作為多個列表時側滑返回失效及cell側滑刪除失效的問題

繼承自UICollectionView：

@implementation XYCollectionView
// 是否允許同時支援多個手勢，預設是不支援多個手勢
// 返回yes表示支援多個手勢
- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldRecognizeSimultaneouslyWithGestureRecognizer:(UIGestureRecognizer *)otherGestureRecognizer {
    if
 
 (gestureRecognizer.view == self) {
        if (self.contentOffset.x <= 0 && gestureRecognizer.state != UIGestureRecognizerStatePossible) {
            return YES;
        }
    }
    return NO;
}
// 每次觸控式螢幕幕時保證collectionView第一時間可以響應滾動
- (UIView *)hitTest:(CGPoint)point withEvent:(UIEvent *)event {
    self
 
.scrollEnabled = YES;
    return [super hitTest:point withEvent:event];
}
@end

設定下面這個是為了觸發側滑返回時collectionView不再去滾動cell， 在CollectionView的代理方法中，根據collectionView的contentOffse讓其是否可以滾動

- (void)scrollViewDidScroll:(UIScrollView *)scrollView {
UIPanGestureRecognizer *pan = (UICollectionView *)scrollView.panGestureRecognizer
    if
 
 (pan.view == scrollView) {
        if (_switchState == 0 && _downloadingArr.count > 0) {
            for (NSInteger i = 0; i < _downloadingArr.count; ++i) {
                NSIndexPath *indexPath = [NSIndexPath indexPathForRow:i inSection:0];
                UITableViewCell *cell = [self.tableView cellForRowAtIndexPath:indexPath];
              // 此處是為了解決cell左滑刪除失效的問題
                if (cell && [cell isKindOfClass:[DownloadingCell class]]) {
                    CGPoint location = [pan locationInView: scrollView];
                    if (location.y > 0 && location.y < cell.frame.size.height*(i+1)) {
                       scrollView.scrollEnabled = NO;
                    }
                }
            }
        }
        
        // 此處是為了解決滑動到第一個cell左側邊緣時側滑返回失效問題
        if (scrollView .contentOffset.x < 0) {
            scrollView.scrollEnabled = NO;
        } else {
            scrollView.scrollEnabled = YES;
        }
    }
    
}

最終效果：每次又滑到第一個cell邊緣時，就會觸發側滑返回