iOS: ImageView 方面适合角半径

Question

我想使用以下代码将内容模式的角半径设置为纵横比:

  cell.imgvAlbum.contentMode = UIViewContentModeScaleAspectFit;
  cell.imgvAlbum.clipsToBounds = YES;
  cell.imgvAlbum.layer.cornerRadius  = 5.0f;

但我只获得内容模式的输出作为纵横比匹配。我也尝试过:

  cell.imgvAlbum.layer.masksToBounds  = YES;

圆角半径怎么办？请给我一些解决方案。提前致谢。

Answer 1

使用以下方法获取具有指定圆角半径的圆角图像，将上述所有属性应用为 UIViewContentModeScaleAspectFit，裁剪到边界等。在 ImageView 上，并通过在 ImageView 上调用以下函数来设置接收到的图像。

-(UIImage *)makeRoundedImage:(UIImage *) image
                      radius: (float) radius;
{
    CALayer *imageLayer = [CALayer layer];
    imageLayer.frame = CGRectMake(0, 0, image.size.width, image.size.height);
    imageLayer.contents = (id) image.CGImage;

    imageLayer.masksToBounds = YES;
    imageLayer.cornerRadius = radius;

    UIGraphicsBeginImageContext(image.size);
    [imageLayer renderInContext:UIGraphicsGetCurrentContext()];
    UIImage *roundedImage = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();

    return roundedImage;
}

调用为

  UIImage *image = [self makeRoundedImage:[UIImage imageNamed:@"accept~iphone"]
                    radius: 5.0f];

  cell.imgvAlbum.contentMode = UIViewContentModeScaleAspectFit;
  cell.imgvAlbum.clipsToBounds = YES;
  cell.imgvAlbum.layer.cornerRadius  = 5.0f;

  cell.imgvAlbum.layer.masksToBounds  = YES;

  [cell.imgvAlbum setImage: image];