Swift NSImage到CGImage [英] Swift NSImage to CGImage

问题描述

如何在Swift中将NSImage转换为CGImage？在Objective-C我做了这样：

How can I convert a NSImage to CGImage in Swift? In Objective-C I did it like this:

- (CGImageRef)CGImage {
    NSData *imageData = self.TIFFRepresentation;
    CGImageSourceRef source = CGImageSourceCreateWithData((__bridge CFDataRef)imageData, NULL);
    CGImageRef maskRef =  CGImageSourceCreateImageAtIndex(source, 0, NULL);
    return maskRef;
}

现在我试过：

extension NSImage {
    var CGImage: CGImageRef {
    get {
        let imageData = self.TIFFRepresentation
        let source = CGImageSourceCreateWithData(imageData as CFDataRef, nil)
        let maskRef = CGImageSourceCreateImageAtIndex(source, UInt(0), nil)
        return maskRef;
    }
    }
}

我收到错误：无法找到一个重载的'init'接受提供的参数'在行 let maskRef ...

推荐答案

这里是我用来将NSImage转换为CGImage：

Here's what I'm using to convert NSImage to CGImage:

let image = NSImage(named:"image")
if let image = image {
    var imageRect:CGRect = CGRectMake(0, 0, image.size.width, image.size.height)
    var imageRef = image.CGImageForProposedRect(&imageRect, context: nil, hints: nil)
}

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