I'm having a homeView which is the initial view to appear when app launches. In its viewWillAppear() method I check if the user is logged in. If not, he's redirected to login page and if he's not yet registered he'll be directed to sign-up page. I get an error when user clicks the sign-up button. The signUPView appears but it gives a warning that Attempt to present loginViewController on signupViewController whose view is not in the window hierarchy. I have show detail segues between sign-up and login views.
I'm performing the segue after uialert is presented.
I got solutions to put the code in viewDidAppear or ViewWillAppear method but I'm presenting the viewControllers upon button press. So I can't use these methods.
I have searched for a lot of solutions but unable to get the right one.
Please help!
Thank you.
segue triggering code from sign-up :
dispatch_async(dispatch_get_main_queue()) {
if self.registerSuccess == true {
let alert = UIAlertController(title: "Registered!", message: "You have registered successfully!", preferredStyle: UIAlertControllerStyle.Alert)
alert.addAction(UIAlertAction(title: "OK", style: .Default, handler: { (action) -> Void in
self.dismissViewControllerAnimated(true, completion: nil)
self.nameTextField.text = ""
self.emailTextField.text = ""
self.passwordTextField.text = ""
self.performSegueWithIdentifier("loginSegue", sender: self)
}))
self.presentViewController(alert, animated: true, completion: nil)
} else {
let alert = UIAlertController(title: "Registration Failed!", message: "Please try again", preferredStyle: UIAlertControllerStyle.Alert)
alert.addAction(UIAlertAction(title: "OK", style: .Default, handler: { (action) -> Void in
self.dismissViewControllerAnimated(true, completion: nil)
}))
self.presentViewController(alert, animated: true, completion: nil)
}
}
screenshot of my storyboard
Related
I'm trying to dismiss the current view controller in the completion handler of a UIAlertAction, but it is not dismissing. I have written the following code (The loading indicator is simply a loading alert controller that I dismiss when the data was successfully uploaded):
loadingIndicator.dismiss(animated: true) {
let success = UIAlertController(title: "Successfully Uploaded", message: "", preferredStyle: .alert)
let ok = UIAlertAction(title: "Ok", style: .default, handler: { _ in
print("Ok selected") //this is working correctly
self.dismiss(animated: true, completion: nil) //this is not
})
success.addAction(ok)
self.present(success, animated: true, completion: nil)
}
However, after clicking on "Ok" in the alert, "Ok selected" is printed but the view controller is not dismissed. Nothing else shows up in the debugger.
Try dismissing it on Main thread and also check if ViewController is presented or pushed in navigation hierarchy.
loadingIndicator.dismiss(animated: true) {
let success = UIAlertController(title: "Successfully Uploaded", message: "", preferredStyle: .alert)
let ok = UIAlertAction(title: "Ok", style: .default, handler: { _ in
DispatchQueue.main.async {
self.dismiss(animated: true, completion: nil)
// If pushed use PopViewController on navigation
// self.navigationController?.popViewController(animated: true)
}
})
success.addAction(ok)
self.present(success, animated: true, completion: nil)
}
To check if ViewController is being presented or not use self.isBeingPresented property.
So here is the deal. Right now I have a viewcontroller where the user can signup, and it is working (checked in Firebase console). The next step is that I have another view with two fields and a Log in button. That login button now has a segue to the third view, home. But it is possible to click it even though nothing has been entered in the two textfields. The button should only work if the user enters his or he details he made in the signup view, thus logging in.
How can I do this?
already have the login code:
#IBAction func loginAction(sender: AnyObject)
{
if self.emailField.text == "" || self.passwordField.text == ""
{
let alertController = UIAlertController(title: "Oops!", message: "Please enter an email and password.", preferredStyle: .Alert)
let defaultAction = UIAlertAction(title: "OK", style: .Cancel, handler: nil)
alertController.addAction(defaultAction)
self.presentViewController(alertController, animated: true, completion: nil)
}
else
{
FIRAuth.auth()?.signInWithEmail(self.emailField.text!, password: self.passwordField.text!) { (user, error) in
if error == nil
{
self.emailField.text = ""
self.passwordField.text = ""
}
else
{
let alertController = UIAlertController(title: "Oops!", message: error?.localizedDescription, preferredStyle: .Alert)
let defaultAction = UIAlertAction(title: "OK", style: .Cancel, handler: nil)
alertController.addAction(defaultAction)
self.presentViewController(alertController, animated: true, completion: nil)
}
In the second if statement you see that it clears the fields to show the login worked.
What i need is that users can only login if the correct details are filled in, that are in the Firebase database.
Instead of checking if there isnt any errors, check that there is data is the user object like this.
FIRAuth.auth()?.signInWithEmail(self.emailField.text!, password: self.passwordField.text!) { (user, error) in
if user != nil
{
let VC = storyboard?.instantiateViewControllerWithIdentifier("Identifier") as! AccountViewController //The file that controls the view
self.presentViewController(VC, animated: true, completion: nil)
}
else
{
let alertController = UIAlertController(title: "Oops!", message: error?.localizedDescription, preferredStyle: .Alert)
let defaultAction = UIAlertAction(title: "OK", style: .Cancel, handler: nil)
alertController.addAction(defaultAction)
self.presentViewController(alertController, animated: true, completion: nil)
}
I managed to fix it by adding self. infront of
storyboard?.instantiate.
Thus creating:
self.storyboard?instantiate.
#IBAction func addButton(sender: AnyObject) {
let alert = UIAlertController(title: "New Exercise Added", message: "\(name)", preferredStyle: UIAlertControllerStyle.Alert)
alert.addAction(UIAlertAction(title: "Ok!!", style: UIAlertActionStyle.Default, handler: nil))
self.presentViewController(alert, animated: true, completion: nil)
self.navigationController?.popToRootViewControllerAnimated(true)
self.dismissViewControllerAnimated(true, completion: {})
}
Within the IB action function of a button I have an alert, followed by some code to change to a different ViewController.
The program crashes upon reaching these lines of code after the alert:
2016-01-04 17:48:27.147 FitnessApp[60584:4080964] popToViewController:transition: called on while an existing transition or presentation is occurring; the navigation stack will not be updated.
How do I run the code to change ViewController after the transition is done?
Your biggest issue is that you don't do anything with the alert button's handler. Instead, you immediately try to do the pop and dismiss after presenting the alert.
Move the code to pop the controller into the Ok button's alert handler.
#IBAction func addButton(sender: AnyObject) {
let alert = UIAlertController(title: "New Exercise Added", message: "\(name)", preferredStyle: UIAlertControllerStyle.Alert)
alert.addAction(UIAlertAction(title: "Ok!!", style: UIAlertActionStyle.Default, handler: {
self.navigationController?.popToRootViewControllerAnimated(true)
// You only need the pop
//self.dismissViewControllerAnimated(true, completion: {})
}))
self.presentViewController(alert, animated: true, completion: nil)
}
Note: I'm not fluent in Swift so the syntax could be off a little.
I have this function and I use it on almost all viewController´s that I have, for some reason went I push "ok" to dismiss the pop up, it switches to another viewController.
this is my function...
extension UIViewController
{
func displayAlert(title: String, message: String)
{
let alert = UIAlertController(title: title, message: message, preferredStyle: UIAlertControllerStyle.Alert)
alert.addAction((UIAlertAction(title: "Ok", style: .Default, handler:
{ (action) -> Void in
self .dismissViewControllerAnimated(true, completion: nil)
})))
self.presentViewController(alert, animated: true, completion: nil)
}
}
any help? I'm using Xcode 7.0 beta 6 with swift 2
You don't need to dismiss the alert controller yourself. That happens automatically with your alert action. You're simply providing a closure that gets called when that "OK" action gets triggered. Just remove this line:
self.dismissViewControllerAnimated(true, completion: nil)
I wrote the following function below to display alerts through my project. Every time i check for an error in a form i display the alert when the user clicks submit. I want to simply show the alert, but not unwind the pervious segue. I want to stay at the current screen and give the user the opportunity to complete the form. Right now when the user clicks submit, it displays the alert ..but when i click the ok button to dismiss the alert it immediately unwinds the segue to the previous screen.
I have included the UIAlertViewDelegate in the class.... any ideas why this might be happening?
func displayAlert(title:String, error:String) {
var alert = UIAlertController(title: title, message: error, preferredStyle: UIAlertControllerStyle.Alert)
alert.addAction(UIAlertAction(title: "OK", style: .Default, handler: { action in
self.dismissViewControllerAnimated(true, completion: nil)
}))
self.presentViewController(alert, animated: true, completion: nil)
}
Never mind.
func displayAlert(title:String, error:String) {
var alert = UIAlertController(title: title, message: error, preferredStyle: UIAlertControllerStyle.Alert)
alert.addAction(UIAlertAction(title: "OK", style: .Default, handler: { action in
//comment out this line and it will still work. It will not segue back to the previous screen.
//self.dismissViewControllerAnimated(true, completion: nil)
}))
self.presentViewController(alert, animated: true, completion: nil)
}