iOS版 - 动画中的UILabel或UITextView的文本大小的变化？ [英] iOS - Animating text size change in UILabel or UITextView?

问题描述

在显示文本块的应用程序，我在当设备转向了横向的字体大小增加。我不喜欢它怎么做整个动画，然后突然跳到​​新的大小，所以我想动画在旋转过程中的尺寸变化。

我读的地方，扔在一个的UIView 动画块这种变化不起作用，因为字体属性不能设置动画，所以有什么是我对做这个选择？

有关我的具体实现，我不能简单地缩放的UILabel / 的UITextView 原样;框的边界比字体尺寸增加更多（按比例），所以会有在文本重新流动。这由我很好。

编辑：我会被罚款与简单地缩放的UITextView

另外，我正在考虑动画它手动：我有一个勾画出我的意见，并为调整字体大小的方法。如果我知道，当转速为即将开始，而动画的持续时间，我可以火候所以它呈现中间字体大小或两个在动画的中间。任何帮助，让那些将AP preciated。

解决方案

  

如果我知道当旋转约
  开始，和的时间
  动画...

滑稽您应该提及。动画开始之前，你的视图控制器将获得 willAnimateRotationToInterfaceOrientation：时间：消息，为您提供所需的确切信息

In an application showing chunks of text, I'm having the font size increase when the device is turned to a landscape orientation. I don't like how it does the whole animation and then suddenly jumps to the new size, so I'd like to animate the size change over the course of the rotation.

I read somewhere that throwing this change in a UIView animation block doesn't work because the font property is not animatable, so what are my options for doing this?

For my specific implementation I'm not simply scaling the UILabel/UITextView as-is; The bounds of the box is increasing more (proportionally) than the font-size, so there will be re-flow in the text. That's fine by me.

Edit: I would be fine with simply scaling the UITextView.

Also, I was considering "animating" it manually: I have a method that lays out my views and adjusts for font size. If I knew when the rotation was about to start, and the duration of the animation, I could time it so it renders an intermediate font size or two in the middle of the animation. Any help with getting those would be appreciated.

解决方案

If I knew when the rotation was about to start, and the duration of the animation...

Funny you should mention that. Just before the animation starts, your view controller will receive a willAnimateRotationToInterfaceOrientation:duration: message that gives you the exact information you need.

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