Ios 访问Firebase中的用户帐户时生成完成块错误

我试图在从firebase表中提取用户配置文件时创建完成块。我需要在允许它传回值之前完成它

以下是我到目前为止的情况：

func getProf(email: String, pass: String, completionBlock: @escaping (_ success: Bool) -> (Int)) {
        let ref = Database.database().reference()
        let userID = Auth.auth().currentUser?.uid
        ref.child("users").child(userID!).observeSingleEvent(of: .value, with: { (snapshot) in
            let value = snapshot.value as? NSDictionary
            self.zDaily = value?["qday"] as? Int ?? 0
        }) {
            if let error = error {
                completionBlock(false)
            } else {
                completionBlock(true)
                return zDaily
            }
        }
        
    }

我得到以下错误：

Cannot convert value of type '() -> _' to expected argument type '((Error) -> Void)?'

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我不知道如何解决这个问题，如果您有任何建议，我们将不胜感激。

我不确定这是否能解决错误。如果没有，那么我想我知道这个问题，它将与您的错误块和您的observeEvent有关

 func getProf(email: String, pass: String, completionBlock: @escaping (Bool, Int) -> ()) {
            let ref = Database.database().reference()
            let userID = Auth.auth().currentUser?.uid
            ref.child("users").child(userID!).observeSingleEvent(of: .value, with: { (snapshot) in
                let value = snapshot.value as? NSDictionary
                self.zDaily = value?["qday"] as? Int ?? 0
            }) { (error) in //Added return error value - this may fix your error
                if let error = error {
                    completionBlock(false, 0) //Add default 0 to return if error
                } else {
                    completionBlock(true, zDaily) //Added zDaily as Int to return
                    //return zDaily - return will not return in async function so you can return the value in completionBlock above.
                }
            }
            
        }

编辑：刚刚做了一个更改，从observeEvent返回一个错误对象

 func getProf(email: String, pass: String, completionBlock: @escaping (Bool, Int) -> ()) {
            let ref = Database.database().reference()
            let userID = Auth.auth().currentUser?.uid
            ref.child("users").child(userID!).observeSingleEvent(of: .value, with: { (snapshot) in
                let value = snapshot.value as? NSDictionary
                self.zDaily = value?["qday"] as? Int ?? 0
            }) { (error) in //Added return error value - this may fix your error
                if let error = error {
                    completionBlock(false, 0) //Add default 0 to return if error
                } else {
                    completionBlock(true, zDaily) //Added zDaily as Int to return
                    //return zDaily - return will not return in async function so you can return the value in completionBlock above.
                }
            }
            
        }

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它正在抛出条件绑定的初始值设定项必须具有可选类型，而不是“Error”错误。它不喜欢错误的可选链接。还在想办法解决这个问题。嗯，从来没有收到通知-你能解决这个错误吗？