viewController
https://www.jianshu.com/p/6b79cf270796 使用presentingViewController属性可能会遇到的坑
https://www.jianshu.com/p/5ca24feae0ba UIViewController
https://www.jianshu.com/p/8d19d299ca7a iOS小记－－－－－－关于view－viewcontroller页面之间的跳转的方法
UIView
https://www.jianshu.com/p/7242bc413ca8 [UIVIew]谈谈对drawRect的理解
https://www.jianshu.com/p/4bcaf6349133 UIView并没想的那么简单 - tintColor揭秘
https://www.jianshu.com/p/ae6843d981b6 UIView的setNeedsLayout, layoutIfNeeded 和 layoutSubviews 方法之间的关系解释
https://www.jianshu.com/p/d0d3f6b5a1b0 使用drawRect有什么影响？
https://www.jianshu.com/p/e08b80856e1a iOS-hitTest:withEvent与自定义hit-testing规则
https://www.jianshu.com/p/2f664e71c527 一篇搞定事件传递、响应者链条、hitTest和pointInside的使用
https://www.jianshu.com/p/a03024557c66 iOS开发技巧：快速实现 圆角+描边
https://www.jianshu.com/p/f972e0db785a iOS frame和Bounds 以及frame和bounds区别
https://www.jianshu.com/p/abe815018b2a iOS 设置视图半透明而子控件不透明
https://www.jianshu.com/p/50c46c72e3dd iOS 中间镂空效果的View
https://www.jianshu.com/p/e4e179cea022 programming iOS - view drawing (一)
https://www.jianshu.com/p/fc35592b9fd1 convertPoint: toView: 等方法详解(链接)
https://www.jianshu.com/p/9ac372683735 iOS-UIBezierPath和各种layer把我玩坏了
https://www.jianshu.com/p/2f500c765541 iOS绘画之UIBezierPath
https://www.jianshu.com/p/c38b79c9527b iOS 验证码View的实现方案
https://www.jianshu.com/p/b9be23d50f5c UI 里面的类简要说明(转载)
https://www.jianshu.com/p/3b317a80abce drawRect layoutSubviews
