iPhone UIView-调整框架大小以适合子视图

问题描述

添加子视图后，是否应该有一种方法来调整UIView框架的大小，以使框架的大小成为包围所有子视图所需的大小?如果您的子视图是动态添加的，那么如何确定容器视图的框架需要多大的尺寸?这不起作用:

Shouldn't there be a way to resize the frame of a UIView after you've added subviews so that the frame is the size needed to enclose all the subviews? If your subviews are added dynamically how can you determine what size the frame of the container view needs to be? This doesn't work:

[myView sizeToFit];

推荐答案

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要点是sizeToFit用于子类重写，并且在UIView中不执行任何操作.它为UILabel做一些事情，因为它会覆盖由sizeToFit

The gist is that sizeToFit is for subclasses to override, and doesn't do anything in UIView. It does stuff for UILabel, because it overrides sizeThatFits: which is called by sizeToFit

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