UIViewAutoresizingNone = 0,
UIViewAutoresizingFlexibleLeftMargin = 1 << 0,
UIViewAutoresizingFlexibleWidth = 1 << 1,
UIViewAutoresizingFlexibleRightMargin = 1 << 2,
UIViewAutoresizingFlexibleTopMargin = 1 << 3,
UIViewAutoresizingFlexibleHeight = 1 << 4,
UIViewAutoresizingFlexibleBottomMargin = 1 << 5
UIViewAutoresizingNone
UILabel* label = [[UILabel alloc] initWithFrame:CGRectMake(50, 100, 200, 40)];
[label setAutoresizingMask: UIViewAutoresizingNone];
控件相对于俯视图坐标值不变
CGRectMake(50, 100, 200, 40)
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
同理
UIViewAutoresizingFlexibleHeight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)];
50
屏幕的宽度为320 当屏幕宽度为480时 label宽度 变为 50*480/320
控件变为
CGRectMake(75, 100, 200, 40)];
UIViewAutoresizingFlexibleRightMargin
UIViewAutoresizingFlexibleTopMargin
UIViewAutoresizingFlexibleBottomMargin
