imageView添加阴影和边框

//    //给imageView添加阴影和边框//    UIImageView*imgvPhoto = [[UIImageView alloc] init];    //添加边框    CALayer *layer = [imageView layer];    layer.borderColor = [UIColor whiteColor].CGColor;    layer.borderWidth = 5.0f;    //添加四个边阴影    imageView.layer.shadowColor = [UIColor blackColor].CGColor;    imageView.layer.shadowOffset = CGSizeMake(0,0);    imageView.layer.shadowOpacity = 0.5;    imageView.layer.shadowRadius = 10.0;//给imageview添加阴影和边框    //添加两个边的阴影    imageView.layer.shadowColor = [UIColor blackColor].CGColor;    imageView.layer.shadowOffset = CGSizeMake(4,4);    imageView.layer.shadowOpacity = 0.5;    imageView.layer.shadowRadius=2.0;