iphone - UIScrollview - 带有慢动画的scrollRectToVisible [英] iphone - UIScrollview - scrollRectToVisible with slow animation

问题描述

我正在使用UIScrollView并使用scrollRectToVisible：动画
这对我来说很好。
但是我想慢慢滚动到某个位置，以便用户可以注意到这个效果。
是否有可能。

I'm using UIScrollView and using scrollRectToVisible:animated This is working fine for me. But I want to scroll to a location slowly so that user can notice the effect. Is it possible.

我正在尝试以下代码，但没有成功。

I'm trying the following code, but didn't succeed.

[UIView beginAnimations:nil context:NULL];
[UIView setAnimationBeginsFromCurrentState:YES];
[UIView setAnimationDuration:2.0];  
[scrlView scrollRectToVisible:<<some cgrect>> animated:YES];            
[UIView commitAnimations];          

推荐答案

解决方案实际上非常简单。如果您使用 [scrollView scrollRectToVisible：frame animated：YES] ，scrollview将启动它自己的动画，因此为了使用您的持续时间制作动画，您必须使用动画中的[scrollView scrollRectToVisible：frame animated：NO] 。

The solution is actually pretty easy. If you use [scrollView scrollRectToVisible:frame animated:YES] the scrollview will start it's own animation, so in order to animate with your duration you have to use [scrollView scrollRectToVisible:frame animated:NO] within your animation.

换句话说：这样可行。

[UIView animateWithDuration:3 
                      delay:0 
                    options:UIViewAnimationOptionCurveEaseInOut 
                 animations:^{ [scrollView scrollRectToVisible:frame animated:NO]; } 
                 completion:NULL];

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