UIImageView内容模式

蓝线是图像视图的边界。UIImageView's contentMode is UIViewContentModeScaleAspectFit, 我想保持原始图片的比例。 怎样才能让图片的左边缘在UIImageView的左边缘？ 但不喜欢UIViewContentModeTopLeft模式。保持刻度，左侧不留空白。 我的英语不好，希望你们能明白我在说什么。 非常感谢。

 yourimageView.contentMode = UIViewContentModeCenter;
if ( yourimageView.bounds.size.width > yourimageView.size.width && yourimageView.bounds.size.height > yourimageView.size.height) {
   yourimageView.contentMode = UIViewContentModeScaleAspectFit;
}

Swift3

yourimageView.contentMode = .center
if yourimageView.bounds.size.width > yourimageView.size.width && yourimageView.bounds.size.height > yourimageView.size.height {
yourimageView.contentMode = .scaleAspectFit
}

你可以改变你的模式

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,
};