多个UIView动画 [英] Multiple UIView Animations

问题描述

我试图一个接一个地执行多个UIView动画。但是，我听说，一个接一个地执行多个UIView动画是一种不好的做法，我应该改用Core Animation。我尝试了这段代码：

I am trying to perform multiple UIView animations one after the other. However, I've heard that it's bad practice to perform multiple UIView animations one after the other, and that I should instead use Core Animation. I tried this code:

//First Animation
[UIView beginAnimations:@"animation1" context:nil];
[UIView setAnimationDuration:2];
nwView.backgroundColor = [UIColor redColor];
nwView.frame = CGRectMake(CGRectGetMidX(screenSize),
                          CGRectGetMinY(screenSize),
                          width, 
                          height);
nwView.transform = CGAffineTransformMakeRotation(45.0f);
[UIView commitAnimations];

//Second Animation
[UIView beginAnimations:@"second animation" context:nil];
[UIView setAnimationDuration:2];

nwView.transform = CGAffineTransformMakeScale(0.5, 0.33);
nwView.backgroundColor = [UIColor purpleColor];

[UIView commitAnimations];

但是它只播放第二个动画。我知道这个问题类似于 UIView并存的两个动画，但是上下文略有不同。

But it only does the second animation. I know this question is similar to UIView two animations coexisting, but it has a slightly different context.

推荐答案

我认为使用UIView块连续制作2个动画没有任何问题。只需确保在第一个动画的completino块中开始第二个动画即可。

I don't think there is anything wrong with doing 2 animations in a row using UIView blocks. Just make sure you start your second animation in the completino block of the first animation.

如果没有块（您的示例），它将不起作用，因为您必须设置一个委托动画或设置setAnimationDidStopSelector的选择器。在那里，您应该开始第二个动画。

Without blocks (your example) it is not working as you will have to set a delegate to the animation or set a selector for setAnimationDidStopSelector. There you should start the second animation.

但是同样，使用块进行动画也没错（这是首选方式）。

But again, nothing wrong in doing animations with blocks (it is the preferred way).

这篇关于多个UIView动画的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！