uikit——UIView——content

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content

@property(nonatomic)                 UIViewContentMode contentMode;                // default is UIViewContentModeScaleToFill@property(nonatomic)                 CGRect            contentStretch NS_DEPRECATED_IOS(3_0,6_0) __TVOS_PROHIBITED; // animatable. default is unit rectangle {{0,0} {1,1}}. Now deprecated: please use -[UIImage resizableImageWithCapInsets:] to achieve the same effect.

UIViewContentMode

typedef NS_ENUM(NSInteger, UIViewContentMode) {    UIViewContentModeScaleToFill,    UIViewContentModeScaleAspectFit,      // contents scaled to fit with fixed aspect. remainder is transparent    UIViewContentModeScaleAspectFill,     // contents scaled to fill with fixed aspect. some portion of content may be clipped.    UIViewContentModeRedraw,              // redraw on bounds change (calls -setNeedsDisplay)    UIViewContentModeCenter,              // contents remain same size. positioned adjusted.    UIViewContentModeTop,    UIViewContentModeBottom,    UIViewContentModeLeft,    UIViewContentModeRight,    UIViewContentModeTopLeft,    UIViewContentModeTopRight,    UIViewContentModeBottomLeft,    UIViewContentModeBottomRight,};

contentMode属性在UIImageView中应用非常多，用来设置UIImageView的显示方式，contentMode的解释如下：

UIViewContentModeScaleToFill：content缩放，改变比例，content和view完全重叠
UIViewContentModeScaleAspectFit：content缩放，不改变比例，wRatio = view.bounds.width / content.width，hRatio = view.bounds.height / content.height，取ratio = min(wRatio, hRatio)，然后content.width = content.width * ratio，content.height = content.height * ratio，view.bounds的空余部分透明，content的中心位置和view的中心位置重叠
UIViewContentModeScaleAspectFill：content缩放，不改变比例，wRatio = view.bounds.width / content.width，hRatio = view.bounds.height / content.height，取ratio = max(wRatio, hRatio)，然后content.width = content.width * ratio，content.height = content.height * ratio，content的中心位置和view的中心位置重叠，content大于view.bounds的部分是否裁剪遵循clipsToBounds设置
UIViewContentModeRedraw：content缩放，改变比例使content和view完全重叠，当bounds改变时重绘，即调用setNeedsDisplay
UIViewContentModeCenter：content不缩放，content的中心位置和view的中心位置重叠
UIViewContentModeTop：content不缩放，content的顶部中间位置和view的顶部中间位置重叠
UIViewContentModeBottom：content不缩放，content的底部中间位置和view的底部中间位置重叠
UIViewContentModeLeft：content不缩放，content的左边中间位置和view的左边中间位置重叠
UIViewContentModeRight：content不缩放，content的右边中间位置和view的右边中间位置重叠
UIViewContentModeTopLeft：content不缩放，content的左上角位置和view的左上角位置重叠
UIViewContentModeTopRight：content不缩放，content的右上角位置和view的右上角位置重叠
UIViewContentModeBottomLeft：content不缩放，content的左下角位置和view的左下角位置重叠
UIViewContentModeBottomRight：content不缩放，content的右下角位置和view的右下角位置重叠

注：如果clipsToBounds为NO，在UI上显示的是最终的content范围，即使bounds范围小于content范围，如果clipsToBounds为YES，则content显示范围不会超出bounds

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