macos - 在Swift，Cocoa，Mac OSX中将EXIF数据设置为NSImage

如果图像没有exif数据，我正在尝试将exif数据设置为nsimage。实际上我只想把日期时间设为原始的。但我的方法不行。

let completePath = "/Users/stefocdp/image.jpg"
let dateFormatter = NSDateFormatter()
dateFormatter.dateFormat = "dd.MM.yyyy HH:mm:ss"
let folderAttributes: NSDictionary = NSFileManager.defaultManager().attributesOfItemAtPath(completePath, error: nil)!
var dateString: String = dateFormatter.stringFromDate(folderAttributes.objectForKey(NSFileCreationDate) as! NSDate)

for obj in self.image.representations {
    if let rep = obj as? NSBitmapImageRep {
        if rep.valueForProperty(NSImageEXIFData) != nil {
            //will be called if the image has exif data

            // get exif dictonary
            var exifData = rep.valueForProperty(NSImageEXIFData) as! NSDictionary

            //convert CFString to String
            var cfStr:CFString = kCGImagePropertyExifDateTimeOriginal
            var nsTypeString = cfStr as NSString
            var keySwiftString:String = nsTypeString as String

            //get date from exif data
            dateString = exifData.valueForKey(keySwiftString) as! String

            //convert the date to NSDate
            var dateFormatter = NSDateFormatter()
            dateFormatter.dateFormat = "yyyy:MM:dd HH:mm:ss"
            var date = dateFormatter.dateFromString(dateString)

            //convert the NSDate back to String (only because I want another date format)
            dateFormatter.dateFormat = "dd.MM.yyyy HH:mm:ss"
            dateString = dateFormatter.stringFromDate(date!)
        } else {
            //will be called if the image don't has exif data

            //create dictionary for the exif data
            var exifData = Dictionary<String, CFString>()

            //convert the given date string to NSDate
            var dateFormatter = NSDateFormatter()
            dateFormatter.dateFormat = "dd.MM.yyyy HH:mm:ss"
            var date = dateFormatter.dateFromString(dateString)

            //convert it back to String (different date format for exif data)
            dateFormatter.dateFormat = "yyyy:MM:dd HH:mm:ss"
            dateString = dateFormatter.stringFromDate(date!)

            //convert CFString to String
            var cfStr:CFString = kCGImagePropertyExifDateTimeOriginal
            var nsTypeString = cfStr as NSString
            var keySwiftString:String = nsTypeString as String

            //add date to the exifData dictionary
            exifData[keySwiftString] = dateString as CFString

            //set the exifData to the NSBitmapImageRep
            rep.setProperty(NSImageEXIFData, withValue: exifData)

            //add the NSBitmapImageRep to the image
            self.image.addRepresentation(rep)
        }
    }
    else {
        //is not an instance of NSBitmapImageRep
    }
}

如果图像有exif数据，我只需从中获取datetimeoriginal并将其存储在名为“datestring”的字符串变量中。但如果它没有exif数据（在else的情况下），我会创建一个字典来存储日期。然后我将exif数据添加到nsbitmapimagerep。最后，我想将这个imagerep添加到图像中。我想最后一步是问题。
有人能帮我解决问题吗？
谢谢！

最佳答案

//可以使用cgimagesourceref而不是nsbitmapimageref。首先：

let url = NSURL(fileURLWithPath: imgfile) //imgfile = a String of the img file path

let cgiSrc = CGImageSourceCreateWithURL(url,nil)

let cfD:CFDictionaryRef = CGImageSourceCopyPropertiesAtIndex(cgiSrc!, 0, nil)!

let nsDic = NSDictionary(dictionary: cfD)

print(nsDic.description) //verify that it's working

关于macos - 在Swift，Cocoa，Mac OSX中将EXIF数据设置为NSImage，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/31706502/