iPad的：移动的UIView动画，然后移回 [英] iPad: Move UIView with animation, then move it back

问题描述

我有一个UIView子类以下code，将与动画将它关闭屏幕：

I have the following code in a UIView subclass that will move it off the screen with an animation:

float currentX = xposition; //variables that store where the UIView is located
float currentY = yposition;

float targetX = -5.0f - self.width;
float targetY = -5.0f - self.height;

moveX = targetX - currentX; //stored as an instance variable so I can hang on to it and move it back
moveY = targetY - currentY;

[UIView beginAnimations:@"UIBase Hide" context:nil];
[UIView setAnimationDuration:duration]; 
self.transform = CGAffineTransformMakeTranslation(moveX,moveY);
[UIView commitAnimations];

它的工作好了。我已经改变了targetX / Y为0，看它是否确实移动到指定的点，它的作用。

It works just great. I've changed targetX/Y to 0 to see if it does indeed move to the specified point, and it does.

问题是，当我尝试移动视图回到它原来的地方：

The problem is when I try and move the view back to where it was originally:

moveX = -moveX;
moveY = -moveY;

[UIView beginAnimations:@"UIBase Show" context:nil];
[UIView setAnimationDuration:duration];
self.transform = CGAffineTransformMakeTranslation(moveX,moveY);
[UIView commitAnimations];

这看跌期权大约3倍的UIView至于它应该。因此，鉴于通常被放在了屏幕的右侧（取决于它在哪里）。

This puts the UIView about 3x as far as it should. So the view usually gets put off the right side of the screen (depending on where it is).

有什么用CGAffineTransforMakeTranslation功能，我应该知道吗？我读的文档，并从我所知道的，它应该做的事情，我希望它做的事。

Is there something with the CGAffineTransforMakeTranslation function that I should know? I read the documentation, and from what I can tell, it should be doing what I'm expecting it to do.

任何人对如何解决这一问题有何建议？谢谢你。

Anyone have a suggestion of how to fix this? Thanks.

推荐答案

分配到变换将导致旧的消失。返回到原来的位置，分配的身份转换到它

Assigning to a transform will cause the old one to disappear. To return to the original position, assign the identity transform to it.

self.transform = CGAffineTransformIdentity;

（或更好，只是改变了 .frame ，而不是改变 .transform ）

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