访问 Firebase 中的用户帐户时生成的完成块错误

Completion Block Error Generated when accessing User account in Firebase

我试图在从 firebase table 中提取用户配置文件时创建一个完成块。在允许它传回一个值之前,我需要它完成。

这是我目前的情况:

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
            }
        }
        
    }

我收到以下错误:

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

我不确定如何解决这个问题,如有任何建议,我们将不胜感激。

我不确定这是否会修复错误。如果没有,那么我想我知道问题所在,那就是你的错误块和你的 observeEvent。

编辑:刚刚更改了 return 来自 observeEvent 的错误对象。

 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.
                }
            }
            
        }