从 UIImagePickerController 获取 UIImage 的 URL

Question

我正在尝试获取从 Swift 库中导入的图像的 URL，以便使用 transferFile(_:metadata) 将其发送到 Apple Watch，但在 NSURL 上出现两个错误。

这是我的代码：

func imagePickerController(picker: UIImagePickerController, didFinishPickingImage image: UIImage!, editingInfo: [NSObject : AnyObject]!)
{
    imagePicked.image = image    
    let imageUrl = editingInfo[UIImagePickerControllerReferenceURL] as! NSURL
    let imageName = imageUrl.path!.lastPathComponent
    let documentDirectory = NSSearchPathForDirectoriesInDomains(.DocumentDirectory, .UserDomainMask, true).first as String!
    let localPath = documentDirectory.stringByAppendingPathComponent(imageName)
    let image = editingInfo[UIImagePickerControllerOriginalImage]as! UIImage
    let data = UIImagePNGRepresentation(image)

    data!.writeToFile(localPath, atomically: true)

    let photoURL = NSURL(fileURLWithPath: localPath)

    self.dismissViewControllerAnimated(true, completion: nil);
}

我收到了 *imageName 和 *localPath 的错误，因为它说：

'lastPathComponent' 不可用：改为在 NSURL 上使用 lastPathComponent。 'stringByAppendingPathComponent' 不可用：在 NSURL 上使用 URLByAppendingPathComponent。

但我无法在 Swift 2.0 和 Xcode 7 中正确使用它。我哪里出错了？

Answer 1

从 iOS 11 开始，您可以使用 UIImagePickerControllerImageURL 键从信息字典中获取图像 URL。

func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [String : Any]) {
    let imageURL = info[UIImagePickerControllerImageURL] as? URL
}

Answer 2

Apple 在其最新版本 (iOS 9) 中更改了其 NSString 和 NSURL 库中的某些内容，但这些方法可从 iOS 4 中获得。您可以查看相关的 Apple Forum Post 了解更多详细信息。

要修复此错误，您需要更改以下代码：

斯威夫特 2：

func imagePickerController(picker: UIImagePickerController, didFinishPickingImage image: UIImage!, editingInfo: [NSObject : AnyObject]!)
{
    let imageUrl          = editingInfo[UIImagePickerControllerReferenceURL] as! NSURL
    let imageName         = imageUrl.lastPathComponent
    let documentDirectory = NSSearchPathForDirectoriesInDomains(.DocumentDirectory, .UserDomainMask, true).first as String!
    let photoURL          = NSURL(fileURLWithPath: documentDirectory)
    let localPath         = photoURL.URLByAppendingPathComponent(imageName!)
    let image             = editingInfo[UIImagePickerControllerOriginalImage]as! UIImage
    let data              = UIImagePNGRepresentation(image)

    data!.writeToFile(localPath.absoluteString, atomically: true)

    self.dismissViewControllerAnimated(true, completion: nil);
}

斯威夫特 3：

func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [String : Any])
{
    let imageUrl          = info[UIImagePickerControllerReferenceURL] as! NSURL
    let imageName         = imageUrl.lastPathComponent
    let documentDirectory = NSSearchPathForDirectoriesInDomains(.documentDirectory, .userDomainMask, true).first!
    let photoURL          = NSURL(fileURLWithPath: documentDirectory)
    let localPath         = photoURL.appendingPathComponent(imageName!)
    let image             = info[UIImagePickerControllerOriginalImage]as! UIImage
    let data              = UIImagePNGRepresentation(image)

    do
    {
        try data?.write(to: localPath!, options: Data.WritingOptions.atomic)
    }
    catch
    {
        // Catch exception here and act accordingly
    }

    self.dismiss(animated: true, completion: nil);
}

参考：

1. lastPathComponent
2. URLByAppendingPathComponent:

Answer 3

func imagePickerController(picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [NSObject : AnyObject]) {
   //this block of code grabs the path of the file   
   let imageURL = info[UIImagePickerControllerReferenceURL] as NSURL
   let imagePath =  imageURL.path!
   let localPath = NSURL(fileURLWithPath: NSTemporaryDirectory()).URLByAppendingPathComponent(imagePath)

  //this block of code adds data to the above path
   let path = localPath.relativePath!
   let imageName = info[UIImagePickerControllerOriginalImage] as UIImage
   let data = UIImagePNGRepresentation(imageName)
   data?.writeToFile(imagePath, atomically: true)

  //this block grabs the NSURL so you can use it in CKASSET
   let photoURL = NSURL(fileURLWithPath: path)
}