iOS ImageView的Image自适应缩放显示全套处理

//  retina屏幕图片显示问题

[_detailImageViewsetContentScaleFactor:[[UIScreenmainScreen] scale]];

//  不规则图片显示

_detailImageView.contentMode = UIViewContentModeScaleAspectFill;

_detailImageView.autoresizingMask =UIViewAutoresizingFlexibleHeight;

//  图片大于或小于显示区域

_detailImageView.clipsToBounds  =YES;