iOS 监听UIScrollView滚动停止

- (void)scrollViewDidEndDecelerating:(UIScrollView *)scrollView {
    // 停止类型1、停止类型2
    BOOL scrollToScrollStop = !scrollView.tracking && !scrollView.dragging && !scrollView.decelerating;
    if (scrollToScrollStop) {
        [self scrollViewDidEndScroll];
    }
}
- (void)scrollViewDidEndDragging:(UIScrollView *)scrollView willDecelerate:(BOOL)decelerate {
    if (!decelerate) {
        // 停止类型3
        BOOL dragToDragStop = scrollView.tracking && !scrollView.dragging && !scrollView.decelerating;
        if (dragToDragStop) {
            [self scrollViewDidEndScroll];
        }
    }
}
#pragma mark - scrollView 滚动停止
- (void)scrollViewDidEndScroll {
    NSLog(@"停止滚动了！！！");
}