IOS——關於UIView的autoresizingMask屬性的研究

UIView中有個屬性是autoresizingMask，該屬性是用來控制控件的自適應。

 

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

 

UIViewAutoresizingNone：控件相對於父視圖座標值不變；

UIViewAutoresizingFlexibleWidth：控件的寬度隨着父視圖的寬度按比例改變；

例如：label寬度爲100，屏幕的寬度爲320。當屏幕寬度爲480時，label寬度變爲100*480/320

UIViewAutoresizingFlexibleHeight：與UIViewAutoresizingFlexibleWidth相同

UIViewAutoresizingFlexibleLeftMargin：到屏幕左邊的距離隨着父視圖的寬度按比例改變；

例如：CGRectMake(50, 100, 200, 40)]; 當屏幕的寬度爲320，x爲50；當屏幕寬度爲480時，labelx座標變爲 50*480/320。控件座標變爲 CGRectMake(75, 100, 200, 40)];

UIViewAutoresizingFlexibleRightMargin、UIViewAutoresizingFlexibleTopMargin、UIViewAutoresizingFlexibleBottomMargin與UIViewAutoresizingFlexibleLeftMargin相似