swift - 使用 Swift 2.2 OS X 将元数据重写为 .jpg 文件

Question

我正在尝试从 JPG 文件重写元数据。我想在元数据中添加一个关键字。 Xcode 没有给出任何错误，但文件未更改。这是我的代码:

var pathToOpenFile:NSURL?

接下来我将文件路径写入变量“pathToOpenFile”。如果用户将 ENTER 按钮插入 NSTextField，则工作操作:

    @IBAction func endEditKeys(sender: AnyObject) {
       if (pathToOpenFile != nil) {
           let imageSource = CGImageSourceCreateWithURL(pathToOpenFile!, nil)
           let imageProperties = CGImageSourceCopyPropertiesAtIndex(imageSource!, 0, nil)! as NSDictionary;
           let exifDict = imageProperties.valueForKey("{IPTC}")  as! NSDictionary;
           var Keywords:[String] = exifDict.valueForKey("Keywords") as! [String];
           Keywords.append("ANY")
           exifDict.setValue(Keywords, forKey: "Keywords")

           let type = CGImageSourceGetType(imageSource!)
           let count = CGImageSourceGetCount(imageSource!)
           let mutableData = NSMutableData(contentsOfURL: pathToOpenFile!)
           let destination = CGImageDestinationCreateWithData(mutableData!, type!, count, nil)
           let removeExifProperties: CFDictionary = exifDict 

             for i in 0..<count {
                CGImageDestinationAddImageFromSource(destination!, imageSource!, i, removeExifProperties)
             }

           CGImageDestinationFinalize(destination!)
      }
    }

你能帮我吗，为什么它不起作用(不更改元数据)？谢谢!

Answer 1

谢谢大家!它正在工作，最后只需要重写 .JPG 文件。

if let _ = try? mutableData!.writeToURL(pathToOpenFile!, options: NSDataWritingOptions.AtomicWrite) {
          //  if you need, do anything. For example "print ("Savig file")"
        }