iOS开发系列-UIImageView的contentMode

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,

};

UIViewContentModeScaleAspectFit：会保证图片比例不变，等比缩放，使得图片能够完全显示在UIImageView，会导致UIImageView有空白

UIViewContentModeScaleAspectFill：会保证图片比例不变，等比缩放，使得UIImageView被图片填充，会导致图片显示不完全。

官方给了一组图片如下：

巴特西

iOS开发系列-UIImageView的contentMode

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