[英]How to remove the transparent area of an UIImageView after masking?
In one of my iOS applications, I am trying to cut a portion of an image using CGImageMask
. 在我的一个iOS应用程序中,我试图使用
CGImageMask
剪切图像的CGImageMask
。 I have succeeded in masking the image with the following code: 我已成功使用以下代码屏蔽图像:
- (UIImage *)maskImage:(UIImage *)referenceImage withMask:(UIImage *)maskImage {
CGImageRef maskRef = maskImage.CGImage;
CGImageRef mask = CGImageMaskCreate(CGImageGetWidth(maskRef),
CGImageGetHeight(maskRef),
CGImageGetBitsPerComponent(maskRef),
CGImageGetBitsPerPixel(maskRef),
CGImageGetBytesPerRow(maskRef),
CGImageGetDataProvider(maskRef), NULL, false);
CGImageRef masked = CGImageCreateWithMask([referenceImage CGImage], mask);
return [UIImage imageWithCGImage:masked];
}
So, my image will be: 所以,我的形象将是:
myImageView.image = [self maskImage:[UIImage imageNamed:@"image.png"]
withMask:[UIImage imageNamed:@"mask.png"]];
Problem: The output image is of the same size of reference image('image.png') with transparent area around. 问题:输出图像与参考图像('image.png')的大小相同,周围有透明区域。 But I want to avoid those transparent area, and crop the result image.
但我想避开那些透明区域,并裁剪结果图像。 How can I achieve this?
我怎样才能做到这一点? There are several masks, and the mask frames are not similar to all.
有几个掩模,并且掩模框架与所有掩模框架不相似。 I am attaching a reference image of the problem overview here.
我在这里附上问题概述的参考图像。 Please help me friends.
请帮帮我的朋友。 Thanks in advance.
提前致谢。
Look up auto-cropping a UIImage. 查找自动裁剪UIImage。 This should crop out anything transparent.
这应该是透明的。
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