UIView上添加其他UIView1 但是UIView1上的button不能点击
一旦子视图超出了父视图，那么子视图就失效了。
解决方案：Autolayout中加入相应语句使父视图面积能够包含子视图。
解决方案：Autolayout中加入相应语句使父视图面积能够包含子视图。
Delegate
Each delegate is responsible for a specific role or task to keep the system simple and clean.Whenever an object needs to perform a certain task, it depends on another object to handle it. This is usually known as “separation of concerns” in software design.
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