我创建了一个应用程序,当用户注册时,应该在用户文档的 Firestore 服务器中创建两个值,即级别和主题(意味着它在/users/userid 中)。
我已尝试手动创建“用户”集合,但在用户注册时没有创建任何内容。
以下是我的代码(SignUpViewController):
import Firebase
var reference: DocumentReference!
func firebaseAuth() {
let userDisplayName = textfieldDisplayName.text!
let userEmail = textfieldEmail.text!
let userPassword = textfieldPassword.text!
if userEmail == "" || userPassword == "" {
labelMessage.isHidden = false
labelMessage.textColor = UIColor.red
labelMessage.text = "Error: A compulsory field is left blank."
} else {
Auth.auth().createUser(withEmail: userEmail, password: userPassword) { (user, error) in
if user != nil && error == nil {
let changeRequest = Auth.auth().currentUser?.createProfileChangeRequest()
changeRequest?.displayName = userDisplayName
changeRequest?.commitChanges(completion: { (error) in
if error == nil {
let userID = Auth.auth().currentUser?.uid
let dataToSave: [String: Any] = ["level":0, "subjects":[""]]
self.reference = Firestore.firestore().collection("users").document(userID ?? "")
self.reference.setData(dataToSave, completion: { (error) in
if error == nil {
self.performSegue(withIdentifier: "presentInitial", sender: self)
} else {
self.labelMessage.isHidden = false
self.labelMessage.textColor = UIColor.red
self.labelMessage.text = "Error: \(error?.localizedDescription ?? "")"
}
})
self.performSegue(withIdentifier: "presentInitial", sender: self)
} else {
self.labelMessage.isHidden = false
self.labelMessage.textColor = UIColor.red
self.labelMessage.text = "Error: \(error?.localizedDescription ?? "")"
}
})
} else {
self.labelMessage.isHidden = false
self.labelMessage.textColor = UIColor.red
self.labelMessage.text = "Error: \(error?.localizedDescription ?? "")"
}
}
}
}
以下代码来自 SignUpViewController 重定向到 (HomeViewController) 的另一个 View Controller:
import Firebase
var reference: DocumentReference!
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view.
let userID = Auth.auth().currentUser?.uid
reference.getDocument { (docSnapshot, error) in // Fatal error occured here
let data = docSnapshot?.data()
let userLevel = data?["level"] as? String ?? ""
if userLevel == "" {
self.performSegue(withIdentifier: "performSetup", sender: self)
}
}
}
我预计当重定向到主页时(通过 presentInitial 进行搜索),主页将读取“level”的值。但是,该应用程序因 fatal error 而崩溃:“ fatal error :在隐式展开可选值时意外发现 nil”,其中“级别”本应从服务器读取。
最佳答案
我认为问题不在于 Firestore。根据错误信息,代码包装了一个可选值但失败,因为它是nil
,所以问题可能出在这三行:
let userDisplayName = textfieldDisplayName.text!
let userEmail = textfieldEmail.text!
let userPassword = textfieldPassword.text!
有时,当 UITextField
没有文本时,它的 text
是 nil
而不是 ""
,这可能会导致问题。您可以将这三行替换为以下内容:
let userDisplayName = textfieldDisplayName.text ?? ""
let userEmail = textfieldEmail.text ?? ""
let userPassword = textfieldPassword.text ?? ""
这样,当没有文本时,这三个变量将始终为""
,您检查空白字段的逻辑仍然有效。
编辑:为了将来引用,真正的问题不在问题中,而在这个答案的评论中。
关于swift - Firestore 数据库不存储数据,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/56503210/