Swift 中 UIImageWriteToSavedPhotosAlbum 之后的图片 URL

Question

在我用相机拍照后，我使用以下代码保存图像：

UIImageWriteToSavedPhotosAlbum(image, self,"image:didFinishSavingWithError:contextInfo:", nil)

这会将图像保存在相机胶卷中。此外，我想将 URL 保存到 Core Data 中保存的图像。是否可以检索 URL（或路径）以便我只需要保存这个 URL 而不是 Core Data 中的完整图像？

Answer 1

在阅读了很多用 ObjectivC 编写的答案后，我终于想出了如何用 Xcode 6.2 用 Swift 编写这个：

ALAssetsLibrary().writeImageToSavedPhotosAlbum(image.CGImage, orientation: ALAssetOrientation(rawValue: image.imageOrientation.rawValue)!,
            completionBlock:{ (path:NSURL!, error:NSError!) -> Void in
                println("\(path)")
        })

Answer 2

这是我的组合..

保存图片：

    let imageData = NSData(data:UIImagePNGRepresentation(pickedimage))
    let paths = NSSearchPathForDirectoriesInDomains(NSSearchPathDirectory.DocumentDirectory, NSSearchPathDomainMask.UserDomainMask, true)
    var docs: String = paths[0] as! String
    let fullPath = docs.stringByAppendingPathComponent("yourNameImg.png")
    let result = imageData.writeToFile(fullPath, atomically: true)

    print(fullPath)

获取图片：

    let nsDocumentDirectory = NSSearchPathDirectory.DocumentDirectory
    let nsUserDomainMask    = NSSearchPathDomainMask.UserDomainMask
    if let paths            = NSSearchPathForDirectoriesInDomains(nsDocumentDirectory, nsUserDomainMask, true)
    {
        if paths.count > 0
        {
            if let dirPath = paths[0] as? String
            {
                let readPath = dirPath.stringByAppendingPathComponent("yourNameImg.png")
                let image    = UIImage(contentsOfFile: readPath)

                UploadImagePreview.image = image
            }
        }
    }

我们可以尝试使用 Photos Framework 来获取最后保存的图像。

    var fetchOptions: PHFetchOptions = PHFetchOptions()

    fetchOptions.sortDescriptors = [NSSortDescriptor(key: "creationDate", ascending: true)]

    var fetchResult = PHAsset.fetchAssetsWithMediaType(PHAssetMediaType.Image, options: fetchOptions)

    if (fetchResult.firstObject != nil) {

        var lastAsset: PHAsset = fetchResult.lastObject as! PHAsset

        PHImageManager.defaultManager().requestImageForAsset(lastAsset, targetSize: self.UploadImagePreview.bounds.size, contentMode: PHImageContentMode.AspectFill, options: PHImageRequestOptions(), resultHandler: { (result, info) -> Void in

            self.UploadImagePreview.image = result

        })

    }