如何在路径中制作透明区域uiimage

Question

In iOS,
I have a image.
Then, I want to make transparent area in specific path of the image.
The below image is some image. And, the heart area is random path to be transparent area.
I have just one full image.
I want to make transparent specific area of image. It is UIImage, not UIImageView. So, I can't use masking.

https://stackoverflow.com/a/8306254/2160799
I tried to use this solution, but the heart area was filled with blue color, not transparent. :(
The document explain like this. Because the solution uses imageContext(not window or bitmap contexts), I should not use the function( CGContext.clear(_:) )

If the provided context is a window or bitmap context, Core Graphics clears the rectangle. For other context types, Core Graphics fills the rectangle in a device-dependent manner. However, you should not use this function in contexts other than window or bitmap contexts.

Answer 1

You can use the below snippet. Here you would be creating an imagecontext using the api UIGraphicsBeginImageContextWithOptions(_:_:_:) and specified the opaque parameter as false which would make the end image transparent.

UIGraphicsBeginImageContextWithOptions(image.size, false, 0)
image.draw(at: .zero)
if let context = UIGraphicsGetCurrentContext() {
    context.addPath(bezierPath.cgPath)
    context.setBlendMode(.clear)
    context.setFillColor(UIColor.clear.cgColor)
    context.fillPath()

    let capturedImage = UIGraphicsGetImageFromCurrentImageContext()
    UIGraphicsEndImageContext()
}