UIView clipsTobounds

view1添加view2到其中，如果view2大于view1，或者view2的坐标不在view1的范围内，view2是盖着view1的，意思就是超出的部份也会画出来

UIView有一个属性，clipsTobounds 默认情况下是NO,
如果，我们想要view2把超出的那部份隐藏起来的话，就得改变它的父视图也就view1的clipsTobounds属性值。
view1.clipsTobounds = YES;


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