The default implementation of this method does nothing on iOS 5.1 and earlier. Otherwise, the default implementation uses any constraints you have set to determine the size and position of any subviews.
iOS - layoutSubviews總結(jié)(作用及調(diào)用機(jī)制)iOS layout機(jī)制相關(guān)方法 layoutSubviews在以下情況下會(huì)被調(diào)用: 1敛助、init初始化不會(huì)觸發(fā)layoutSubviews但是是用initWithFrame...