objective-c 如何在两个以上的 UIViews 之间进行翻转动画？
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How to do a flip animation between more than two UIViews?
提问by rksprst
I have animation code in a class that extends the UIView:
我在扩展 UIView 的类中有动画代码：
// Start Animation Block
CGContextRef context = UIGraphicsGetCurrentContext();
[UIView beginAnimations:nil context:context];
[UIView setAnimationTransition: UIViewAnimationTransitionFlipFromLeft forView:[self superview] cache:YES];
[UIView setAnimationCurve:UIViewAnimationCurveEaseInOut];
[UIView setAnimationDuration:1.0];
//int nextView = currentView + 1;
// Animations
[[self superview] exchangeSubviewAtIndex:0 withSubviewAtIndex:1];
//And so I would do: [[self superview exchangeSubviewAtIndex:currentView withSubviewAtIndex:nextView];
//Doesn't work because curentView is not global... with each instance of a class it's reset to what it's instanciated to.
//currentView++;
// Commit Animation Block
[UIView commitAnimations];
This animation code works fine for two views. But I am trying to do this for many views. I tried by adding in a global variable (nextview index and currentView index), however this doesn't work since each custom view class has it's own instance and these variables aren't shared.
此动画代码适用于两个视图。但是我正在尝试针对许多视图执行此操作。我尝试添加一个全局变量（nextview 索引和 currentView 索引），但是这不起作用，因为每个自定义视图类都有自己的实例并且这些变量不共享。
Does anyone know how I can accomplish what I want to do?
有谁知道我怎样才能完成我想做的事？
Thanks!
谢谢！
Edit: I would be able to do this, if I could use [self superview] to access the index of the currentview and of the nextview. Are there some methods to do this?
编辑：如果我可以使用 [self superview] 访问当前视图和下一个视图的索引，我将能够做到这一点。有没有一些方法可以做到这一点？
回答by Max Stewart
Apple have a pretty good tutorial on view transitions here. Other than the way they implement them you can also look at using a UINavigationController which manages a bunch of views and transitioning between them.
Apple 有一个关于视图转换的非常好的教程here。除了他们实现它们的方式之外，您还可以使用 UINavigationController 来管理一堆视图并在它们之间进行转换。
Essentially you need to manage the transition in the superview rather than the view - the superview can know who it's currently displaying and who's next.
本质上，您需要在超级视图而不是视图中管理过渡 - 超级视图可以知道它当前显示的是谁以及下一个显示的是谁。
回答by Noah Witherspoon
If you have pointers to the views you're trying to switch between, just call -removeFromSuperview on the "from" view and -addSubview:(the "to" view) on the superview. The transition doesn't rely on any particular method call; more or less any form of the "swap two views" approach will be animated properly.
如果您有指向要在它们之间切换的视图的指针，只需在“来自”视图上调用 -removeFromSuperview 并在超级视图上调用 -addSubview:(“to”视图）。转换不依赖于任何特定的方法调用；或多或少任何形式的“交换两个视图”方法都将正确动画。
回答by Matt James
For those who find this question who are supporting iOS 4.0 and higher, Apple has provided a built-in API for this task:
对于那些发现此问题且支持 iOS 4.0 及更高版本的人，Apple 已为此任务提供了内置 API：
回答by Nick Stinemates
I think a Linked List of views might be what you should think about implementing.
我认为链接列表视图可能是您应该考虑实施的内容。
