将元数据应用于图像导致performChanges请求失败
我正在使用PhotoKit编辑照片，我需要保留原始照片的元数据。 为此，我保存元数据，然后将其提供给CGImageDestinationAddImage的options参数。 我能够最终确定并成功将其写入磁盘，但是当我调用performChanges来提交资源编辑时，它会失败。 如果我提供nil options ，它将成功。 这里怎么了？
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 }) } } })
错误是： Error Domain=NSCocoaErrorDomain Code=-1 "The operation couldn't be completed. (Cocoa error -1.)
元数据中的某些键似乎会导致失败。 这工作：
NSArray *validMetadataKeys = @[ (NSString *)kCGImagePropertyTIFFDictionary, (NSString *)kCGImagePropertyGIFDictionary, (NSString *)kCGImagePropertyJFIFDictionary, (NSString *)kCGImagePropertyExifDictionary, (NSString *)kCGImagePropertyPNGDictionary, (NSString *)kCGImagePropertyIPTCDictionary, (NSString *)kCGImagePropertyGPSDictionary, (NSString *)kCGImagePropertyRawDictionary, (NSString *)kCGImagePropertyCIFFDictionary, (NSString *)kCGImageProperty8BIMDictionary, (NSString *)kCGImagePropertyDNGDictionary, (NSString *)kCGImagePropertyExifAuxDictionary, ]; NSMutableDictionary *validMetadata = [NSMutableDictionary dictionary]; [metadata enumerateKeysAndObjectsUsingBlock:^(id key, id obj, BOOL *stop) { if ([validMetadataKeys containsObject:key]) { validMetadata[key] = obj; } }]; // your CGImage stuff CGImageDestinationAddImageFromSource(destination, imgSource, 0, (__bridge CFDictionaryRef)validMetadata);
我有完全相同的问题，我已经提交了雷达rdar：// 21057247。 我尝试使用TSIlogging一个案例，但我被告知要提交一个雷达。
似乎填充PHContentEditingOutput对象的adjustementData属性是强制性的，以编辑照片。
我们应该把新图像的数据写到我们获得的URL上
let theExportURL = output.renderedContentURL
在我的情况下，我正在这样做…
let outputData = UIImagePNGRepresentation(bakedImage)
而在运行时，我得到了错误
Error Domain=NSCocoaErrorDomain Code=-1 "The operation couldn't be completed. (Cocoa error -1.)
但是当我开始导出这样的数据…
let outputData = UIImageJPEGRepresentation(bakedImage, 1)
有效。 这是logging在这里… https://developer.apple.com/library/prerelease/ios/documentation/Photos/Reference/PHContentEditingOutput_Class/index.html
和这个相同的问题已经在这里回答了… https://stackoverflow.com/a/28362235
//如果资产不允许所请求的更改types，则这些方法将引发exception，在资产上调用canPerformEditOperation：以确定是否允许编辑操作的types。
- （instancetype）changeRequestForAsset 🙁 PHAsset *）资产;
我想这是因为苹果不希望你改变metaData。你可以尝试下面的这个方法，也许创build一个新的是允许的。
- （instancetype）creationRequestForAssetFromImage：（UIImage *）image;
- （instancetype）creationRequestForAssetFromImageAtFileURL：（NSURL *）fileURL;
- （instancetype）creationRequestForAssetFromVideoAtFileURL：（NSURL *）fileURL;