【发布时间】：2021-09-08 10:51:35
【问题描述】：
我正在使用 firebase 数据库开发一个项目，我使用他们的 displayName 而不是 uid 保存用户。我检查尝试注册的用户的 displayName 是否在 firebase 上的 displayNames 列表中，如果不是，我允许用户使用该 displayName 进行注册。
这是我的注册功能；
func signUp(email: String, password: String) {
//gets the user data in the firebase
Database.database().reference().child("users").observe(.value) { [self] (snapshot) in
if snapshot.hasChild(self.userNameTxtField.text!){ //checking the displayName
self.present(alertFunction(message: "Seçmiş olduğunuz kullanıcı adı daha önceden alınmış."), animated: true)
} else {
Auth.auth().createUser(withEmail: email, password: password) { (authResult, error) in
if let error = error as NSError? {...} else {
self.signIn(email: email, password: password)
}
}
}
}
}
这是我的登录功能；
func signIn(email: String, password: String) {
Auth.auth().signIn(withEmail: email, password: password) { (authResult, error) in
if let error = error as NSError? {...} else {
self.activityIndicator.stopAnimating()
self.view.isUserInteractionEnabled = true
//create database reference
self.ref = Database.database().reference()
//create new child and write a value on the existance child
if self.userNameTxtField.text == ""{
print("User Name can not be nill!")
self.present(self.alertFunction(message: "Kullanıcı adı boş bırakılamaz"), animated: true)
} else {
UserDefaults.standard.setValue(true, forKey: "userSignedIn")
if let currentUser = Auth.auth().currentUser?.createProfileChangeRequest() {
currentUser.displayName = self.userNameTxtField.text!
currentUser.commitChanges(completion: { error in
if let error = error {
print(error)
} else {
print("DisplayName changed")
self.ref.child("users").child(currentUser.displayName!).setValue(["nickname": self.userNameTxtField.text ?? ""])
self.ref.child("users/\(currentUser.displayName!)/step_count").setValue(Int(0))
self.ref.child("users/\(currentUser.displayName!)/total_point").setValue(Int(0))
self.ref.child("users/\(currentUser.displayName!)/onesignal_player_id").setValue("")
self.performSegue(withIdentifier: "showMainFromRegister", sender: self)
}
})
}
}
}
}
}
最后是我的actionFunction；
func alertFunction(message: String) -> UIAlertController {
let alert = UIAlertController(title: "Uyarı!", message: message, preferredStyle: .alert)
alert.addAction(UIAlertAction(title: "Tamam", style: .cancel, handler: nil))
self.activityIndicator.stopAnimating()
self.view.isUserInteractionEnabled = true
return alert
}
我在单击按钮后调用 signUp 函数，并且 signUp 函数正在调用 signIn 函数，如果一切正常，则 signIn 函数调用 performSegue 函数但在 performSegue 之后
snapshot.hasChild(self.userNameTxtField.text!)
多次触发并发出警报；
self.present(alertFunction(message: "Seçmiş olduğunuz kullanıcı adı daha önceden alınmış."), 动画: true)
无故显示。 我该如何解决这个问题？
【问题讨论】：
标签： swift firebase firebase-realtime-database uialertcontroller uialertaction