Views

作者: dzhou3 | 来源:发表于2018-05-27 07:39 被阅读0次

View Basics

iOS app的UI由View对象组成,一个对象:

1. 是UIView或其子类的一个实例

2. 知道如何画出本身

3. 可以处理事件,例如触摸

4. 存在于一组视图,这些视图的根视图是app的window

View drawing occurs on an as-needed basis. When a view is first shown, or when all or part of it becomes visible due to layout changes, the system asks the view to draw its contents.

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