initWithFrame 用来初始化并返回一个新的视图对象，根据指定的 CGRect （尺寸）
用编程方式申明，创建 UIView 对象时候，使用 initWithFrame 方法。
地址：https://www.cnblogs.com/lv14/articles/5013262.html
https://www.jianshu.com/p/19c083751497
https://segmentfault.com/q/1010000011473155
https://www.cnblogs.com/yajunLi/p/6344023.html
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