在做登录注册的时候往往需要设置TextField的leftView，如果直接添加一个UIImageView到leftView，textField的光标就会紧挨着图片导致界面不是太美观，解决这个问题的方法非常简单，只需要把UIImageView添加到一个UIView里设置好位置，再把UIView放到textField的leftView里就好了
设置圆角使用self.layer.cornerRadius
当该视图有子视图时并且子视图遮挡住俯视图被设置为圆角的部分时需要加一句self.layer.masksToBounds = YES,因为子视图会覆盖俯视图所以就看不到圆角效果了
该句话决定子layer是否被当前layer的边界剪切。
没有使用self.layer.masksToBounds=YES 蓝色视图遮盖住红色视图的左上角所以显示的不是圆角
使用self.layer.masksToBounds=YES，设置圆角效果也可以作用于子视图,但是这样的话会造成离屏渲染,如果一个界面需要用到大量的圆角尽量不用这个方法
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