所以问题似乎出在我的profileViewController上。在完成此代码段的注册后，我设置了当前用户。
class func setCurrent(_ user: User, writeToUserDefaults: Bool = true) {
print(user)
print("")
if writeToUserDefaults {
let data = NSKeyedArchiver.archivedData(withRootObject: user)
UserDefaults.standard.set(data, forKey: "currentUser")
UserDefaults.standard.synchronize()
}
_current = user
print(_current)
}
然后在那之后，它将转到我的profileViewController并尝试寻找原来为空的用户。为什么在我什至没有去视图控制器之前就去那里。为什么没有？
以下是我的个人资料视图控制器和我的viewDidLoad
class ProfileeViewController: UICollectionViewController, UICollectionViewDelegateFlowLayout {
var profileHandle: DatabaseHandle = 0
var profileRef: DatabaseReference?
let cellID = "cellID"
let profileSetupTransition = AlterProfileViewController()
let settingView = SettingsViewController()
var userEvents = [Event]()
var userId: String?
var user: User?
var emptyLabel: UILabel?
var currentUserName: String = ""
override func viewDidLoad() {
super.viewDidLoad()
collectionView?.backgroundColor = UIColor.white
let user = self.user ?? User.current
profileHandle = UserService.observeProfile(for: user) { [unowned self](ref, user, events) in
self.profileRef = ref
self.user = user
self.userEvents = events
// self.jobs = allJobs
// self.reciepts = allReciepts
// print(self.userEvents)
// print(self.reciepts)
DispatchQueue.main.async {
self.collectionView?.reloadData()
}
}
我调用setCurrent的方法如下
// will handle the sign up of a user
@objc func handleSignUp(){
// first we cant to take sure that all of the fields are filled
var profilePic: String = ""
// will take the user selected image and load it to firebase
let imageName = NSUUID().uuidString
guard let username = self.nameTextField.text,
let confirmPassword = self.confirmPasswordTextField.text,
let email = self.emailTextField.text,
let password = self.passwordTextField.text,
!username.isEmpty,
!email.isEmpty,
!password.isEmpty,
!confirmPassword.isEmpty
else {
print("Required fields are not all filled!")
return
}
if self.validateEmail(enteredEmail:email) != true{
let alertController = UIAlertController(title: "Error", message: "Please Enter A Valid Email", preferredStyle: .alert)
let defaultAction = UIAlertAction(title: "Ok", style: .cancel, handler: nil)
alertController.addAction(defaultAction)
self.present(alertController, animated: true, completion: nil)
}
// will make sure user is validated before it even tries to create user
// will make sure the password and confirm password textfields have the same value if so it will print an error
if self.passwordTextField.text != self.confirmPasswordTextField.text {
let alertController = UIAlertController(title: "Error", message: "Passwords Don't Match", preferredStyle: .alert)
let defaultAction = UIAlertAction(title: "Ok", style: .cancel, handler: nil)
alertController.addAction(defaultAction)
self.present(alertController, animated: true, completion: nil)
}
//create a reference to the sotrage database in firebase
let storageRef = Storage.storage().reference().child("profile_images").child("\(imageName).PNG")
//following function does the work of putting it into firebase
//notice I also set the value of profilepic oo it can be saved in the updated user instance in the database
if let userImage = selectedImageFromPicker,let uploadData = UIImageJPEGRepresentation(userImage, 0.1){
AuthService.createUser(controller: self, email: email, password: password) { (authUser) in
guard let firUser = authUser else{
return
}
storageRef.putData(uploadData, metadata: nil, completion: { (metadata, error) in
if error != nil {
print(error ?? "")
return
}
profilePic = (metadata?.downloadURL()!.absoluteString)!
//printing to make sure values are contained in these strings
print(profilePic)
print(username)
UserService.create(firUser, username: username, profilePic: profilePic, location: self.userLocation!, completion: { (user) in
guard let user = user else {
print("User not loaded into firebase db")
return
}
User.setCurrent(user, writeToUserDefaults: true)
// will set the current user for userdefaults to work
print(user.profilePic ?? "")
print(user.username ?? "")
// self.delegate?.finishSigningUp()
self.finishSigningUp()
})
})
}
}
}
然后调用此方法将用户移至homeviewController并将其设置为root
func finishSigningUp() {
print("Finish signing up from signup view controller")
print("Attempting to return to root view controller")
let homeController = HomeViewController()
//should change the root view controller to the homecontroller when done signing up
self.view.window?.rootViewController = homeController
self.view.window?.makeKeyAndVisible()
}
最佳答案
当您执行User.current时，将使用用户默认值检索先前保存在该用户默认值上的当前用户，该用户在setCurrent方法上正确吗？
您是否使用键“ currentUser”检查用户是否正确保存在用户默认设置上？也许这就是为什么它为零。
为什么我什至没有去viewcontroller之前就去那里？也许您正在执行某种异步方法计算，即使尚未完成，您也要转到vie控制器。在没有异步方法的结果的情况下，您将其移至该逻辑，并且逻辑上是您的值为零，因为您不希望设置它们。当我看到您的代码片段并且您在代码流中调用了一些异步方法时，这就是一个假设。
关于ios - Controller 在应用程序进入之前就已初始化，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/47117715/