Question

我需要一些帮助，我真的需要知道在我做一些程序生成的滚动后会调用的UIScrollView委托方法。从this链接，我知道我必须尝试实施

- (void)scrollViewDidEndScrollingAnimation:(UIScrollView *)scrollView

但是在我实现它之后，从NSlog，我知道当scrollview已经完成时这个方法没有调用，nslog显示在调用此委托方法之后，应用程序名为

- (void)scrollViewDidScroll:(UIScrollView *)scrollView{

然后再次调用scrollViewDidEndScrollingAnimation，多次回到scrollViewDidScroll，直到滚动真的停止，我需要在编程生成滚动之前将BOOL值设置为True，并且在滚动后需要False才真正停止。有人可以帮我解决这个问题吗？

这是我的示例代码，为此：

BOOL isScroll;

- (void)viewDidLoad {
    isScroll = YES;
    [self generateScrollProgrammatically];
}

- (void) generateScrollProgrammatically{
    //i do some code for scrolling uiscrollview programmatically
}

- (void)scrollViewDidScroll:(UIScrollView *)scrollView{
    NSLog(@"scrollViewDidScroll");

    if (isScroll){
        //do something
    }

}

- (void)scrollViewDidEndScrollingAnimation:(UIScrollView *)scrollView{
    NSLog(@"scrollViewDidEndScrollingAnimation");
}

这里是我被告知的nslog：

2012-05-31 09:58:10.583 myApps[1203:fb03] scrollViewDidScroll
2012-05-31 09:58:10.584 myApps[1203:fb03] scrollViewDidScroll
2012-05-31 09:58:10.595 myApps[1203:fb03] scrollViewDidScroll
2012-05-31 09:58:10.596 myApps[1203:fb03] scrollViewDidScroll
2012-05-31 09:58:10.597 myApps[1203:fb03] scrollViewDidScroll
2012-05-31 09:58:10.598 myApps[1203:fb03] scrollViewDidScroll
2012-05-31 09:58:10.611 myApps[1203:fb03] scrollViewDidScroll
2012-05-31 09:58:10.615 myApps[1203:fb03] scrollViewDidScroll
2012-05-31 09:58:10.616 myApps[1203:fb03] scrollViewDidScroll
2012-05-31 09:58:10.617 myApps[1203:fb03] scrollViewDidEndScrollingAnimation
2012-05-31 09:58:10.631 myApps[1203:fb03] scrollViewDidScroll
2012-05-31 09:58:10.632 myApps[1203:fb03] scrollViewDidScroll
2012-05-31 09:58:10.633 myApps[1203:fb03] scrollViewDidEndScrollingAnimation
2012-05-31 09:58:10.634 myApps[1203:fb03] scrollViewDidScroll
2012-05-31 09:58:10.635 myApps[1203:fb03] scrollViewDidScroll
2012-05-31 09:58:10.636 myApps[1203:fb03] scrollViewDidEndScrollingAnimation
2012-05-31 09:58:10.636 myApps[1203:fb03] scrollViewDidScroll
2012-05-31 09:58:10.637 myApps[1203:fb03] scrollViewDidScroll
2012-05-31 09:58:10.638 myApps[1203:fb03] scrollViewDidEndScrollingAnimation
2012-05-31 09:58:10.640 myApps[1203:fb03] scrollViewDidScroll
2012-05-31 09:58:10.642 myApps[1203:fb03] scrollViewDidScroll
2012-05-31 09:58:10.644 myApps[1203:fb03] scrollViewDidEndScrollingAnimation
2012-05-31 09:58:10.644 myApps[1203:fb03] scrollViewDidScroll
2012-05-31 09:58:10.645 myApps[1203:fb03] scrollViewDidScroll
2012-05-31 09:58:10.646 myApps[1203:fb03] scrollViewDidEndScrollingAnimation

Answer 1

是的，这也是我的意思。我能找到的唯一方法是替换：

[scrollView setContentOffset:offset animated:YES];

使用：

[UIView animateWithDuration:[[UIApplication sharedApplication] statusBarAnimationDuration]
                 animations:^{ scrollView.contentOffset = offset; }
                 completion:^{ [scrollView.delegate scrollViewDidEndScrollingAnimation:scrollView]; }];

在编程生成的滚动完成后将调用的UIScrollview委托方法

1 个答案: