UIViewAutoresizingNone = 0,UIViewAutoresizingFlexibleLeftMargin = 1 << 0,UIViewAutoresizingFlexibleWidth = 1 << 1,UIViewAutoresizingFlexibleRightMargin = 1 << 2,UIViewAutoresizingFlexibleTopMargin = 1 << 3,UIViewAutoresizingFlexibleHeight = 1 << 4,UIViewAutoresizingFlexibleBottomMargin = 1 << 5
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;......
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