无法转换“用户？”类型的值到预期的参数类型“用户！”

Question

我怀疑我的代码有问题，我无法确定我在这里做错了什么。错误在此行：self.setUserInfo(firstLastName: firstLastName, user: user, username: username, location: location, biography: biography, password: password, pictureData: pictureData) 在我的注册函数中。

无法转换“用户？”类型的值到预期的参数类型“用户！”

func signUP(firstLastName: String, username: String, email: String, location: String, biography: String, password: String, pictureData: NSData!) {

    Auth.auth().createUser(withEmail: email, password: password) { (user, error) in
        if error == nil{

           self.setUserInfo(firstLastName: firstLastName, user: user, username: username, location: location, biography: biography, password: password, pictureData: pictureData)

        }else{
            print(error?.localizedDescription)
        }
    }


}

private func setUserInfo(firstLastName: String, user: User!, username: String, location: String, biography: String, password: String, pictureData: NSData!){

    let imagePath = "profileImage\(user.uid)/userPic.jpg"
    let imageRef = storageRef.child(imagePath)

let metaData = StorageMetadata()
    metaData.contentType = "image/jpeg"
    imageRef.putData(pictureData as Data, metadata: metaData){(newMetaData, error)
        in
        if error == nil{
            let changeRequest = User.createProfileChangeRequest()
            changeRequest.displayName = username
            if let photoURL = newMetaData!.downloadURL(){
                changeRequest.photoURL = photoURL

            }
            changeRequest.commitChanges(completion: { (error) in
                if error == nil{

                    self.saveUserInfo(firstLastName: firstLastName, user: user, username: username, location: location, biography: biography, password: password)

                    print("user info set")

                }else{
                    print(error?.localizedDescription)
                }
            })

        }else{
            print(error?.localizedDescription)
        }

    }

}

Answer 1

在 setUserInfo 方法中，您使用“！”设置了用户参数的展开值，但在您的身份验证中。完成块似乎该值是可选的。

解决方法如下：

Auth.auth().createUser(withEmail: email, password: password) { [weak self] (user, error) in

    guard let unwrappedError = error, 
          let unwrappedUser = user, 
          let strongSelf = self 
    else {
        print(error?.localizedDescription)
        return
    }

    strongSelf.setUserInfo(firstLastName: firstLastName, user: unwrappedUser, username: username, location: location, biography: biography, password: password, pictureData: pictureData)
}

编辑：我添加了一个 strongSelf 模式并使用了一个保护语句，因为你在这里明确地保留了 self （网络回调闭包中的一个 no no ！），并且在这种情况下，保护语句是处理有效性检查的首选方法，因为它更清楚你的意图是什么。