滚动指示器的不正确行为

Question

我有UIScrollView。我使用代码设置 contentOffset ：

    [UIView animateWithDuration:0.2 delay:0 options:UIViewAnimationOptionAllowUserInteraction | UIViewAnimationOptionCurveEaseOut animations:^{
    [comicsScrollView setContentOffset:CGPointMake(comicsScrollView.contentOffset.x, currentView.frame.origin.y + currentView.bounds.size.height/2 - comicsScrollView.bounds.size.height/2) animated:NO];
        } completion:^(BOOL finished) {
     }];

进入

- (void)scrollViewDidEndDragging:(UIScrollView *)scrollView willDecelerate:(BOOL)decelerate

方法和代码相同

- (void)scrollViewWillBeginDecelerating:(UIScrollView *)scrollView

当我进行垂直滚动时 - 滚动指示器的行为不正确，它会跳跃或保持在先前的位置。

我的错误在哪里？

Answer 1

setContentOffset 调用可以为您处理动画。传入animated:YES 并丢失UIView animationWithDuration: 块。

换句话说，试试这个：

[comicsScrollView setContentOffset:CGPointMake(comicsScrollView.contentOffset.x,     
   currentView.frame.origin.y + currentView.bounds.size.height/2 -    
   comicsScrollView.bounds.size.height/2) animated:YES];
} completion:nil];