OSX UIGraphicsBeginImageContext

Question

我有一个iOS应用程序，我现在正在为Mac创建。我有下面的代码，将图像转换为1024的大小，并根据图像的纵横比计算出宽度。这在iOS上有效，但显然不适用于OSX。我不确定如何创建NSImage的PNG表示，或者我应该使用什么来代替UIGraphicsBeginImageContext。有什么建议吗？谢谢。

        var image = myImageView.image

        let imageData = UIImagePNGRepresentation(image)
        let imageWidth = image?.size.width
        let calculationNumber:CGFloat = imageWidth! / 1024.0

        let imageHeight = image?.size.height
        let newImageHeight = imageHeight! / calculationNumber

        UIGraphicsBeginImageContext(CGSizeMake(1024.0, newImageHeight))
        image?.drawInRect(CGRectMake(0, 0, 1024.0, newImageHeight))
        var resizedImage = UIGraphicsGetImageFromCurrentImageContext()
        UIGraphicsEndImageContext()

        let imageData = UIImagePNGRepresentation(resizedImage)

        let theImageData:NSData = UIImagePNGRepresentation(resizedImage)
        imageFile = PFFile(data: theImageData)

Answer 1

您可以使用：

let image = NSImage(size: newSize)
image.lockFocus()
//draw your stuff here
image.unlockFocus()
if let data = image?.TIFFRepresentation {
    let imageRep = NSBitmapImageRep(data: data)
    let imageData = imageRep?.representationUsingType(NSBitmapImageFileType.NSPNGFileType, properties: [:])
    //do something with your PNG data here
}

Answer 2

我的观点是..。使用部分重叠的图像绘制图像的快速扩展：

extension NSImage {

    func mergeWith(anotherImage: NSImage) -> NSImage {

        self.lockFocus()
        //draw your stuff here

        self.draw(in: CGRect(origin: .zero, size: size))
        let frame2 = CGRect(x: 4, y: 4, width: size.width/3, height: size.height/3)
        anotherImage.draw(in: frame2)

        self.unlockFocus()
        return self
    }

}

最终效果：

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