面具周围的UIImage边框 [英] UIImage border around mask

问题描述

我目前正在使用此代码在我的图像。

I am currently this code to create a mask on my image.

- (UIImage*) maskImage:(UIImage *) image withMask:(UIImage *) mask
{
    CGImageRef imageReference = image.CGImage;
    CGImageRef maskReference = mask.CGImage;

    CGImageRef imageMask = CGImageMaskCreate(CGImageGetWidth(maskReference),
                                             CGImageGetHeight(maskReference),
                                             CGImageGetBitsPerComponent(maskReference),
                                             CGImageGetBitsPerPixel(maskReference),
                                             CGImageGetBytesPerRow(maskReference),
                                             CGImageGetDataProvider(maskReference),
                                             NULL, // Decode is null
                                             YES // Should interpolate
                                             );

    CGImageRef maskedReference = CGImageCreateWithMask(imageReference, imageMask);
    CGImageRelease(imageMask);

    UIImage *maskedImage = [UIImage imageWithCGImage:maskedReference];
    CGImageRelease(maskedReference);

    return maskedImage;
}

我现在想在屏蔽输出周围添加2点边框（如来源网址）。我有什么想法可以实现这个目标吗？

I now want to add a 2 point border around the masked output (Like in the source url). Any ideas how I can accomplish this?

谢谢！

推荐答案

请参考以下链接，我也想实现同样的目标。

Please refer to the below link, I also wanted to achieve the same.

将边框应用于图像形状

请在下面找到代码：

- (UIImage*)mergeImage:(UIImage*)first withImage:(UIImage*)second
{
    // get size of the second image
    CGImageRef secondImageRef = second.CGImage;
    CGFloat secondWidth = CGImageGetWidth(secondImageRef);
    CGFloat secondHeight = CGImageGetHeight(secondImageRef);

    float offsetwt,offsetht,offset;

    offset=20;
    if(UI_USER_INTERFACE_IDIOM() == UIUserInterfaceIdiomPhone)
    {
        offset=offset/2;
    }
    offsetht=(secondHeight   * (secondWidth+offset)) /secondWidth;
    offsetwt=secondWidth+offset;

    // build merged size
    CGSize mergedSize = CGSizeMake(offsetwt,offsetht);

    // capture image context ref
    UIGraphicsBeginImageContext(mergedSize);

    //Draw images onto the context
    [first drawInRect:CGRectMake(0, 0, offsetwt, offsetht)];
    [second drawInRect:CGRectMake(offset/2, offset/2, secondWidth, secondHeight) blendMode:kCGBlendModeNormal alpha:1.0];

    // assign context to new UIImage
    UIImage *newImage = UIGraphicsGetImageFromCurrentImageContext();

    // end context
    UIGraphicsEndImageContext();

    return  newImage;
}

第一个参数是用于屏蔽的图像，第二个参数是屏蔽图像。您可以根据您的要求设置偏移量。
我希望这可以帮到你。

Where first parameter the image you use for masking and second is the masked image. You may set offset as per your requirement. I hope this helps you.

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