我想直接从[CGImage]创建一个gif作为Data。使用功能
func createGIF(with images: [NSImage], name: NSURL, loopCount: Int = 0, frameDelay: Double) {
let destinationURL = name
let destinationGIF = CGImageDestinationCreateWithURL(destinationURL, kUTTypeGIF, images.count, nil)!
// This dictionary controls the delay between frames
// If you don't specify this, CGImage will apply a default delay
let properties = [
(kCGImagePropertyGIFDictionary as String): [(kCGImagePropertyGIFDelayTime as String): frameDelay]
]
for img in images {
// Convert an NSImage to CGImage, fitting within the specified rect
let cgImage = img.CGImageForProposedRect(nil, context: nil, hints: nil)!
// Add the frame to the GIF image
CGImageDestinationAddImage(destinationGIF, cgImage, properties)
}
// Write the GIF file to disk
CGImageDestinationFinalize(destinationGIF)
}
...来自帖子（Swift - Create a GIF from Images and turn it into NSData）。
我想将此gif保存为可转换数据作为entity.property。
因此，我想跳过将其保存到documents.url的步骤，并基本上从[CGImage]创建一个gif作为数据并设置为entity.gif。
是否有CGImageCreate函数可以接受[CGImage]并输出gif作为数据？