PhotoKit を使用して写真を編集していますが、元の写真のメタデータを保持する必要があります。そのために、メタデータを保存し、それを のoptions
パラメーターに提供しますCGImageDestinationAddImage
。ファイナライズしてディスクに正常に書き込むことはできますがperformChanges
、アセットの編集をコミットするために呼び出すと失敗します。代わりに私が提供すればnil
、options
それは成功します。ここで何がうまくいかないのですか?
asset.requestContentEditingInputWithOptions(options) { (input: PHContentEditingInput!, _) -> Void in
//get full image
let url = input.fullSizeImageURL
let inputImage = CIImage(contentsOfURL: url)
//get orginal photo's metadata
let originalImageData = NSData(contentsOfURL: url)!
let imageSource = CGImageSourceCreateWithData(originalImageData, nil)
let metadata: CFDictionaryRef = CGImageSourceCopyPropertiesAtIndex(imageSource, 0, nil)
println(metadata) //prints all the metadata, yay!
//do some processing on original photo here and create an output CIImage...
//save to disk
let dataRef = CFDataCreateMutable(nil, 0)
let destination = CGImageDestinationCreateWithData(dataRef, CGImageSourceGetType(imageSource), 1, nil)
let eaglContext = EAGLContext(API: .OpenGLES2)
let ciContext = CIContext(EAGLContext: eaglContext)
let cgImage = ContextStruct.ciContext!.createCGImage(outputPhoto, fromRect: outputPhoto.extent())
CGImageDestinationAddImage(destination, cgImage, metadata) //metadata is problematic - replacing with nil causes it to work
if CGImageDestinationFinalize(destination) {
let contentEditingOutput = PHContentEditingOutput(contentEditingInput: input)
contentEditingOutput.adjustmentData = "something"
let imageData: NSData = dataRef
let success = imageData.writeToURL(contentEditingOutput.renderedContentURL, options: .AtomicWrite, error: _)
if success {
PHPhotoLibrary.sharedPhotoLibrary().performChanges({ () -> Void in
let request = PHAssetChangeRequest(forAsset: asset)
request.contentEditingOutput = contentEditingOutput
}, completionHandler: { (success: Bool, error: NSError!) -> Void in
if success == false { println('failed to commit image edit: \(error)') } //fails unless metadata is replaced with nil above
})
}
}
})
エラーは次のとおりです。Error Domain=NSCocoaErrorDomain Code=-1 "The operation couldn’t be completed. (Cocoa error -1.)