TL； DR:iOS照片编辑扩展无法保存对照片的更改，除非这些更改是使用设备沿横向向左拍摄的。

我正在尝试在iOS上开发照片编辑扩展程序。

我的代码基于Xcode模板Apple's sample code以及在线上提供的一些教程。

我注意到有些照片在应用更改后无法保存；我收到一个警报视图，内容为:

无法保存更改

保存时发生错误。请稍后再试。

好

在网络上搜索时，我在堆栈溢出中遇到了以下两个问题:

DispatchQueue.global(qos: .userInitiated).async {
    // Load full-size image to process from input.
    guard let url = input.fullSizeImageURL
        else { fatalError("missing input image url") }
    guard let inputImage = CIImage(contentsOf: url)
        else { fatalError("can't load input image to apply edit") }

    // Define output image with Core Image edits.
    let orientedImage = inputImage//.applyingOrientation(input.fullSizeImageOrientation)
    let outputImage: CIImage
    switch selectedFilterName {
        case .some(wwdcFilter):
            outputImage = orientedImage.applyingWWDCDemoEffect()
        case .some(let filterName):
            outputImage = orientedImage.applyingFilter(filterName, parameters: [:])
        default:
            outputImage = orientedImage
    }

    // Usually you want to create a CIContext early and reuse it, but
    // this extension uses one (explicitly) only on exit.
    let context = CIContext()
    // Render the filtered image to the expected output URL.
    if #available(OSXApplicationExtension 10.12, iOSApplicationExtension 10.0, *) {
        // Use Core Image convenience method to write JPEG where supported.
        do {
            try context.writeJPEGRepresentation(of: outputImage, to: output.renderedContentURL, colorSpace: inputImage.colorSpace!)
            completionHandler(output)
        } catch let error {
            NSLog("can't write image: \(error)")
            completionHandler(nil)
        }
    } else {
        // Use CGImageDestination to write JPEG in older OS.
        guard let cgImage = context.createCGImage(outputImage, from: outputImage.extent)
            else { fatalError("can't create CGImage") }
        guard let destination = CGImageDestinationCreateWithURL(output.renderedContentURL as CFURL, kUTTypeJPEG, 1, nil)
            else { fatalError("can't create CGImageDestination") }
        CGImageDestinationAddImage(destination, cgImage, nil)
        let success = CGImageDestinationFinalize(destination)
        if success {
            completionHandler(output)
        } else {
            completionHandler(nil)
        }
    }
}

最佳答案

我当然已经看到保存失败，因为定向的东西是错误的，但是以下架构目前似乎对我有用:

func startContentEditing(with contentEditingInput: PHContentEditingInput, placeholderImage: UIImage) {
    self.input = contentEditingInput
    if let im = self.input?.displaySizeImage {
        self.displayImage = CIImage(image:im, options: [.applyOrientationProperty:true])!
        // ... other stuff depending on what the adjustment data was ...
    }
    self.mtkview.setNeedsDisplay()
}
func finishContentEditing(completionHandler: @escaping ((PHContentEditingOutput?) -> Void)) {
    DispatchQueue.global(qos:.default).async {
        let inurl = self.input!.fullSizeImageURL!
        let output = PHContentEditingOutput(contentEditingInput:self.input!)
        let outurl = output.renderedContentURL
        var ci = CIImage(contentsOf: inurl, options: [.applyOrientationProperty:true])!
        let space = ci.colorSpace!
        // ... apply real filter to `ci` based on user edits ...
        try! CIContext().writeJPEGRepresentation(
            of: ci, to: outurl, colorSpace: space)
        let data = // whatever
        output.adjustmentData = PHAdjustmentData(
            formatIdentifier: self.myidentifier, formatVersion: "1.0", data: data)
        completionHandler(output)
    }
}

关于ios - 照片扩展名:无法保存未定向为“向上”的图像，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/52384281/