UIImageView自带
//圆角设置 imageView.layer.cornerRadius = 8;(值越大，角就越圆) imageView.layer.masksToBounds = YES; //边框宽度及颜色设置 [imageView.layer setBorderWidth:2]; [imageView.layer setBorderColor:[UIColor blueColor]]; //设置边框为蓝色 //自动适应,保持图片宽高比 imageView.contentMode = UIViewContentModeScaleAspectFit;
原文：http://www.cnblogs.com/gongchen/p/3845135.html