Question

我正在尝试将图像上传到Firebase存储，而尝试上传数据时，我的应用程序崩溃了。这是我得到的错误：

Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '*** -[__NSPlaceholderDictionary initWithObjects:forKeys:count:]: attempt to insert nil object from objects[1]'

这是我的代码（用户单击上传按钮后，调用uploadPostImage将其上传到Firebase存储）：

@objc func addBtnTapped(){
    //Checking if the user chose photo, so user's won't upload photos with the placeholder image.
    if userChoseImage == true{
        let userID : String = (Auth.auth().currentUser?.uid)!
        let postUUID = UUID().uuidString
        guard let postTitle = self.titleTextField.text else { return }
        uploadPostImage { url in
            self.ref.child("posts").child(postUUID).setValue(["title": postTitle,"imageUrl": "http://www.test.com" ,"numberOfLikes": 0, "numberOfDislikes": 0, "postCreator": userID])
        }

    }else{
        let alert = UIAlertController(title: "Choose Image", message: "Please chose image by clicking on the image placeholder photo.", preferredStyle: .alert)
        alert.addAction(UIAlertAction(title: "Ok", style: .default, handler: nil))
        present(alert, animated: true)
    }
}

这是uploadPostImage：

   func uploadPostImage(completion: @escaping((_ url: String?)->())){

    let storageRef = Storage.storage().reference()
    guard let uploadData = self.postImage.image?.jpegData(compressionQuality: 0.8) else { return }

    let metaData = StorageMetadata()
    metaData.contentType = "image/jpg"

    //I think the crash happens here
    storageRef.putData(uploadData, metadata: metaData) { metaData, error in
        if error == nil && metaData != nil{
            if let url = metaData?.downloadURL()?.absoluteString{
                completion(url)
            }else{
                completion(nil)
            }
        }else{
        }
    }

}

我以为，也许我得到的URL是零，但是我试图在其中扔一个URL，但是它仍然崩溃，我在uploadPostImage中设置了一个断点，但似乎没有什么是零。我真的不知道发生了什么。

无法理解为什么应用程序崩溃“试图从对象中插入零对象[1]”

0 个答案: