UIScrollView以自定义速度scrollRectToVisible

问题描述

我有一个UIScrollView，我正在调用scrollRectToVisible：animated：YES就可以了。
我想设置动画的速度。可以这样做吗？

I have a UIScrollView and I'm calling scrollRectToVisible:animated:YES on it.I would like to set the speed at which it is animated. Can that be done?

推荐答案

我最终找到了解决方案。在我的例子中，滚动在启动后以编程方式进行动画制作，以模仿老虎机（具有3个水平UIScrollViews）。正在使用scrollRectToVisible：animated：method。

I ended up finding a solution. In my case, the scrolling was animated programmatically after launch, to mimic a slot machine (with 3 horizontal UIScrollViews). Was doing this with the scrollRectToVisible:animated: method.

我必须使用UIView的beginAnimation设置自定义速度：

I got to set a custom speed using UIView's beginAnimation:

[UIView beginAnimations:nil context:NULL];
[UIView setAnimationDelegate:self];
[UIView setAnimationDuration:(abs(rMid-pMid)*0.3)];
scrollMid.contentOffset = CGPointMake(rMid*320, 0);
[UIView commitAnimations];

AnimationDuration取决于滚动条在每个绘图之间移动的距离。

AnimationDuration depends on the distance the scroller has to move between each "drawing".

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