Question

嗨社区我已经对此问题进行了一段时间的排查，并且没有在网络上找到与我的问题有关的解决方案。

我对快速语言不熟悉我认为这个问题似乎与将NSString转换为String有关。

错误读取

无法转换类型＆＃39; NSString的值？＆＃39;预期的参数类型＆＃39;字符串？＆＃39;

关于我的

let file = PFFile(name: fileName, data: fileData!, contentType: fileType )

这是整个功能

func uploadMessage() {
    var fileData: NSData?
    var fileName: NSString?
    var fileType: NSString?

    if image != nil {
        let newImage = resizeImage(image!, width: view.window!.frame.size.width, height: view.window!.frame.size.height)
        fileData = UIImagePNGRepresentation(newImage)
        fileName = "image.png"
        fileType = "image"
    } else {
        fileData = NSData.dataWithContentsOfMappedFile(videoFilePath! as String) as? NSData
        fileName = "video.mov"
        fileType = "video"
    }

    let file = PFFile(name: fileName, data: fileData!, contentType: fileType )

    file.saveInBackgroundWithBlock { (success: Bool, error: NSError!) -> Void in
        if error == nil {
            let message = PFObject(className: "Messages")
            message.setObject(file, forKey: "file")
            message.setObject(fileType!, forKey: "fileType")
            message.setObject(self.recipients!, forKey: "recipientIds")
            message.setObject(PFUser.currentUser()!.objectId!, forKey: "senderId")
            message.setObject(PFUser.currentUser()!.username!, forKey: "senderName")
            message.saveInBackgroundWithBlock({ (success: Bool, error: NSError!) -> Void in
                if error == nil {
                    //worked!
                    self.reset()
                } else {
                    UIAlertView(title: "Error", message: "Try agian", delegate: nil, cancelButtonTitle: "OK").show()
                }
            })
        } else {
            UIAlertView(title: "Error", message: "Try agian", delegate: nil, cancelButtonTitle: "OK").show()
        }
    }

先谢谢社区。

Answer 1

错误很明显......要么让你的fileName变量成为一个字符串，（因为你使用的是Swift，你可能应该这么做），或者当你要设置文件时，将NSString转换为String let file = PFFile(name: fileName as String, data: fileData!, contentType: fileType)

原始答案仍然有效，但您必须执行以下任一选项：

do {
    let file = try PFFile(name: fileName as String, data: fileData!, contentType: fileType)
} catch (_) {
    //this is the default catch which is exhaustive and will catch all errors. here you can find the specific error if you want, or just use this as a way to know the file wasn't created and to let the user know
}

通话可以抛出，但没有标记为＆＃39;尝试＆＃39;并且不处理错误

1 个答案: