ios - UIImageView 内容模式

Question

蓝线是 ImageView 的边界。 UIImageView的contentMode是UIViewContentModeScaleAspectFit， 我想保持原始图片的比例。 如何使图片的左边缘位于 UIImageView 的左边缘？ 但不像 UIViewContentModeTopLeft 模式。保留刻度，左边没有空白。 我的英语不好，希望你们能明白我在说什么。 非常感谢。

Answer 1

 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,
};