Question

我正在使用快速定位Mac OS导出动画gif，该功能可以使用，但我设置的属性并未应用。我已经设置了我的属性，当我记录它们时，它们会显示出来：

{
HasGlobalColorMap = 1;
LoopCount = 0;
}

在循环中，我将每个帧添加到目标：

CGImageDestinationAddImage(destination, cgGif, gifProperties as CFDictionaryRef)

然后在循环之后，我尝试再次设置属性并最终确定目标：

CGImageDestinationSetProperties(destination, gifProperties as CFDictionaryRef)
            if (!CGImageDestinationFinalize(destination)) {
            NSLog("failed to finalize image destination")
        }

但是，生成的图像未设置为循环。为什么会这样？

Answer 1

实际上，我已经取得了一些进展......

我正在设置这样的选项：

        var imageProperties:NSMutableDictionary = NSMutableDictionary()
    imageProperties.setObject(NSNumber(float: 0.1), forKey: kCGImagePropertyGIFDelayTime as NSString)
    imageProperties.setObject(NSNumber(bool: false), forKey: kCGImagePropertyHasAlpha as NSString)
    imageProperties.setObject(NSString(string: "kUTTypeGIF"), forKey: kCGImageSourceTypeIdentifierHint as NSString)
    imageProperties.setObject(NSNumber(bool: false), forKey: kCGImagePropertyGIFImageColorMap as NSString)
    imageProperties.setObject(NSNumber(bool: true), forKey: kCGImageSourceShouldCache as NSString)
    let nestedImageProperties:NSDictionary = [imageProperties: kCGImagePropertyGIFDictionary]
    println("nestedImageProperties: \(nestedImageProperties)")

这给了我这个结构：

nestedImageProperties: {
    {
    DelayTime = "0.1";
    HasAlpha = 0;
    ImageColorMap = 0;
    kCGImageSourceShouldCache = 1;
    kCGImageSourceTypeIdentifierHint = kUTTypeGIF;
} = "{GIF}";
}

我发现implementation定义了这样的属性：

let fileProperties = [kCGImagePropertyGIFDictionary as String: [kCGImagePropertyGIFLoopCount as String: 0]]
let frameProperties = [kCGImagePropertyGIFDictionary as String: [kCGImagePropertyGIFDelayTime as String: 1.0]]

给出这种结构：

Frame Properties: [{GIF}: [DelayTime: 1.0]]
File Properties: [{GIF}: [LoopCount: 0]]

然后我将fileProperties应用到目标：

CGImageDestinationSetProperties(destination, fileProperties as CFDictionaryRef)

和添加的每个图像的frameProperties：

CGImageDestinationAddImage(destination, imageRef, frameProperties as CFDictionaryRef)

最后，它正在运行，它们正在被应用。

尚未尝试过多个属性，但应该没问题。

CGImageDestination没有采取属性

1 个答案: