关于UIView的autoresizingMask属性的研究

UIView中有个属性是autoresizingMask，该属性是用来控制控件的自适应。

UIViewAutoresizingNone

UIViewAutoresizingFlexibleLeftMargin

UIViewAutoresizingFlexibleWidth

UIViewAutoresizingFlexibleRightMargin

UIViewAutoresizingFlexibleTopMargin

UIViewAutoresizingFlexibleHeight

UIViewAutoresizingFlexibleBottomMargin

UIViewAutoresizingNone：控件相对于父视图坐标值不变；

UIViewAutoresizingFlexibleWidth：控件的宽度随着父视图的宽度按比例改变；

例如：label宽度为100，屏幕的宽度为320。当屏幕宽度为480时，label宽度变为100*480/320

UIViewAutoresizingFlexibleHeight：与UIViewAutoresizingFlexibleWidth相同

UIViewAutoresizingFlexibleLeftMargin：到屏幕左边的距离随着父视图的宽度按比例改变；

例如：CGRectMake(50, 100, 200, 40)]; 当屏幕的宽度为320，x为50；当屏幕宽度为480时，labelx坐标变为 50*480/320。

控件坐标变为 CGRectMake(75, 100, 200, 40)];

UIViewAutoresizingFlexibleRightMargin

UIViewAutoresizingFlexibleTopMargin

UIViewAutoresizingFlexibleBottomMargin

UIViewAutoresizingFlexibleLeftMargin类似