如何UIImage的

Question

我想的UIImage掩蓋這樣的事情如下圖所示的圖像，但其中使用CoreGraphics中屏蔽屏蔽XOR，任何答案是讚賞

Answer 1

試試這個

func maskImage(image:UIImage, mask:(UIImage))->UIImage{ 

     let imageReference = image.cgImage 
     let maskReference = mask.cgImage 

     let imageMask = CGImage(maskWidth: maskReference!.width, 
           height: maskReference!.height, 
           bitsPerComponent: maskReference!.bitsPerComponent, 
           bitsPerPixel: maskReference!.bitsPerPixel, 
           bytesPerRow: maskReference!.bytesPerRow, 
           provider: maskReference!.dataProvider!, decode: nil, shouldInterpolate: true) 

     let maskedReference = imageReference!.masking(imageMask!) 

     let maskedImage = UIImage(cgImage:maskedReference!) 

     return maskedImage 
    }