iOS上实现圆角图片

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;