Swift CGImageDestination不获取属性

我正在使用swift targeting Mac OS导出一个动画gif，它可以工作，但我设置的属性没有被应用。 我已经设置了我的属性，当我记录它们时，它们会显示如下：

{
HasGlobalColorMap = 1;
LoopCount = 0;
}

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

在循环中，我将每个帧添加到目标：

CGImageDestinationAddImage(destination, cgGif, gifProperties as CFDictionaryRef)

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

然后在循环之后，我再次尝试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？

事实上，我已经取得了一些进展

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

我是这样设置选项的：

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

        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)")

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

这给了我这样的结构：

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

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

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

我发现了一个定义如下属性的

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

        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)")

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

鉴于这种结构：

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

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

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

然后，我将fileProperties应用于目标：

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

CGImageDestinationSetProperties(destination, fileProperties as CFDictionaryRef)

以及添加时每个图像的frameProperties：

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

CGImageDestinationAddImage(destination, imageRef, frameProperties as CFDictionaryRef)

最后，它起作用了，它们被应用了

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

---

尚未尝试多个属性，但应该可以。

事实上，我已经取得了一些进展

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

我是这样设置选项的：

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

        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)")

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

这给了我这样的结构：

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

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

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

我发现了一个定义如下属性的

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

        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)")

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

鉴于这种结构：

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

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

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

然后，我将fileProperties应用于目标：

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

CGImageDestinationSetProperties(destination, fileProperties as CFDictionaryRef)

以及添加时每个图像的frameProperties：

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

CGImageDestinationAddImage(destination, imageRef, frameProperties as CFDictionaryRef)

最后，它起作用了，它们被应用了

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

---

尚未尝试多个属性，但应该可以。

我没有意识到我必须为帧和图像设置不同的属性，TY！如果您想让多个属性正常工作，只需将nestedImageProperties声明更改为：让nestedImageProperties=[kCGImagePropertyGIFDictionary as String:imageProperties]，这样您就可以得到{{{GIF}={props}}，而不是像您发布的结构那样得到相反的结果。不用担心，是的，这是声明键的正确方法：字典中的值；）有时我会怀念那些显而易见的欢呼声。我没有意识到我必须为相框和图像设置不同的属性，泰！如果您想让多个属性正常工作，只需将nestedImageProperties声明更改为：让nestedImageProperties=[kCGImagePropertyGIFDictionary as String:imageProperties]，这样您就可以得到{{{GIF}={props}}，而不是像您发布的结构那样得到相反的结果。不用担心，是的，这是声明键的正确方法：字典中的值；）有时我会怀念那些显而易见的欢呼声。

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