'Cannot subscript a value of type '[NSObject : AnyObject]' 索引类型为 'UIImagePickerController.Infokey'

Question

我正在开发一款无需使用 IOS 客户端即可发送邮件的应用程序。我决定使用 mailcore2 async api。现在我可以发送电子邮件，但我想给它添加附件，我实际上是想点击一个按钮，打开图库，select 一张图片并获取它的路径。我正在尝试这段代码，但是 2 和 7 行出现错误，我的“

let imageURL

和

let image

":

"Cannot subscript a value of type '[NSObject : AnyObject]' with an index of type 'UIImagePickerController.InfoKey'

这是代码：

    func imagePickerController(picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [NSObject : AnyObject]) {
        let imageURL = info[UIImagePickerController.InfoKey.referenceURL] as NSURL
        let imageName = imageURL.path!.lastPathComponent
        let documentDirectory = NSSearchPathForDirectoriesInDomains(.documentDirectory, .userDomainMask, true).first as! String
        let localPath = documentDirectory.stringByAppendingPathComponent(imageName)

        let image = info[UIImagePickerController.InfoKey.originalImage] as UIImage
        let data = UIImagePNGRepresentation(image)
        data.writeToFile(localPath, atomically: true)

        let imageData = NSData(contentsOfFile: localPath)!
        let photoURL = NSURL(fileURLWithPath: localPath)
        let imageWithData = UIImage(data: imageData)!

        picker.dismiss(animated: true, completion: nil)
    }

Answer 1

您使用的是旧版本 Swift，以获取图像 URL：

let imageURL = info[UIImagePickerControllerReferenceURL] as NSURL

建议您以后升级到Swift5.0

'Cannot subscript a value of type '[NSObject : AnyObject]' 索引类型为 'UIImagePickerController.Infokey'

'Cannot subscript a value of type '[NSObject : AnyObject]' with an index of type 'UIImagePickerController.Infokey'

xcode

uiimagepickercontroller

mailcore2

swift