I am new developing with swift and don't know how to resolve my problem. I have two views. One for signUp and one for signIn. I added the following functions to my viewControllers and everything works fine. When I click on each textField (for password, username) the view moves up when keyboard appears. But when I sign in a user and after that call "Part 2" of my code and the User is signed in, the view changes from my signInView to my signUpView. The problem: after I did the following steps and tab now on my textFields the keyboard don't appear anymore.
Part 1: Code in signInViewController:
var kbHeight: CGFloat!
override func viewDidLoad() {
super.viewDidLoad()
textFieldUserName.delegate = self
txtFieldUserPassword.delegate = self
}
func textFieldShouldReturn(textField: UITextField) -> Bool {
txtFieldUserPassword.resignFirstResponder()
return true
}
//viewDidAppear or viewWillAppear?
override func viewDidAppear(animated:Bool) {
super.viewWillAppear(animated)
NSNotificationCenter.defaultCenter().addObserver(self, selector: Selector("keyboardWillShow:"), name: UIKeyboardWillShowNotification, object: nil)
NSNotificationCenter.defaultCenter().addObserver(self, selector: Selector("keyboardWillHide:"), name: UIKeyboardWillHideNotification, object: nil)
}
override func viewWillDisappear(animated: Bool) {
super.viewWillDisappear(animated)
NSNotificationCenter.defaultCenter().removeObserver(self)
}
func keyboardWillShow(notification: NSNotification) {
if let userInfo = notification.userInfo {
if let keyboardSize = (userInfo[UIKeyboardFrameBeginUserInfoKey] as? NSValue)?.CGRectValue() {
kbHeight = keyboardSize.height-50
self.animateTextField(true)
}
}
}
func keyboardWillHide(notification: NSNotification) {
self.animateTextField(false)
}
func animateTextField(up: Bool) {
let movement = (up ? -kbHeight : kbHeight)
UIView.animateWithDuration(0.3, animations: {
self.view.frame = CGRectOffset(self.view.frame, 0, movement) //Fatal Error: nil sometimes? - Why?
})
}
Part 2: Code in signInViewController
do {
try signup.signUpUser()
self.showAlert(self)
} catch ...
func showAlert(viewController : UIViewController) -> Void {
let alertController = UIAlertController(title: "Registrieren erfolgreich", message: "Sie können sich jetzt Anmelden", preferredStyle: .Alert)
alertController.addAction(UIAlertAction(title: "Anmelden", style: .Default, handler: { (alertAction) -> Void in self.dismissViewControllerAnimated(true, completion: nil) }))
viewController.presentViewController(alertController, animated: true, completion: nil)
I use this handy solution called TPKeyboardAvoiding in one of my apps: https://github.com/michaeltyson/TPKeyboardAvoiding
With this library you don't need handle this kind of scroll behavior on your app, imagine that you can have other behavior in other VC, and you need to calculate it every time.
Related
Right now my code presents a alert message immediately when the app loads. I would like to change the code to only display the alert message. If the button is not pressed within 20 seconds of loading. The button action is called pressBUTTON.
import UIKit
class ViewController: UIViewController {
let myNotification = Notification.Name(rawValue:"MyNotification")
override func viewDidLoad() {
super.viewDidLoad()
let nc = NotificationCenter.default
nc.addObserver(forName:myNotification, object:nil, queue:nil, using:catchNotification)
}
#IBAction func pressBUTTON(_ sender: Any) {
}
override func viewDidAppear(_ animated: Bool) {
super.viewDidAppear(animated)
let nc = NotificationCenter.default
nc.post(name:myNotification,
object: nil,
userInfo:["message":"Hello there!", "date":Date()])
}
func catchNotification(notification:Notification) -> Void {
print("Catch notification")
guard let userInfo = notification.userInfo,
let message = userInfo["message"] as? String,
let date = userInfo["date"] as? Date else {
print("No userInfo found in notification")
return
}
let alert = UIAlertController(title: "Notification!",
message:"\(message) received at \(date)",
preferredStyle: UIAlertControllerStyle.alert)
alert.addAction(UIAlertAction(title: "OK", style: UIAlertActionStyle.default, handler: nil))
self.present(alert, animated: true, completion: nil)
}}
Wrap your alert code inside a non-repeating Timer with a 20 seconds delay. In your pressBUTTON function, call invalidate on such timer to disable the notification from showing.
Might be a good idea to invalidate the timer when leaving your view controller as well (e.g., in the viewWillDisapear method).
i am trying to dismiss view controller if internet connected. When there is no internet it present my noInternetViewController but when i reconnect to internet, noInternetViewController view didnt dismissed.
override func viewWillDisappear(_ animated: Bool) {
super.viewWillDisappear(animated)
NotificationCenter.default.removeObserver(self, name: ReachabilityChangedNotification, object: reachability)
}
func reachabilityChanged(note: NSNotification) {
let reachability = note.object as! Reachability
if reachability.isReachable {
if noInternet == true {
DispatchQueue.main.async {
self.noInternet = false
self.dismiss(animated: true, completion: nil)
}
}
} else {
noInternet = true
if noInternet == true {
DispatchQueue.main.async {
let storyboard = UIStoryboard(name: "Main", bundle: nil)
let noInternetViewController = storyboard.instantiateViewController(withIdentifier: "NoInternetViewController") as! NoInternetViewController
noInternetViewController.modalPresentationStyle = UIModalPresentationStyle.overFullScreen
self.present(noInternetViewController, animated: true, completion: nil)
}
}
}
}
And NoInternetViewController:
import UIKit
class NoInternetViewController: UIViewController {
override func viewDidLoad() {
super.viewDidLoad()
}
}
Thanks for your helps
In your NoInternetViewController, you can add a Observer to it as well. When you received connection, post a notification to trigger it's selector to dismiss itself.
override func viewDidLoad() {
super.viewDidLoad()
NotificationCenter.default.addObserver(self, selector: #selector(receivedConnection), name: NSNotification.Name.init(rawValue: "ReceivedConnection"), object: nil)
}
func receivedConnection() {
self.dismiss(animated: true, completion: nil)
}
I am attempting to change views in the simulator via a button click but keep getting the error:
Thread 1: signal SIGABRT
I am aware that this usually occurs when there is a disconnect with outlets or actions but I have checked and they all seem to be linked.
AppDelegate.swift
import UIKit
import Parse
#UIApplicationMain
class AppDelegate: UIResponder, UIApplicationDelegate {
var window: UIWindow?
private func application(application: UIApplication, didFinishLaunchingWithOptions launchOptions: [NSObject: AnyObject]?) -> Bool {
// Override point for customization after application launch.
// Parse configuration in Heroku
let configuration = ParseClientConfiguration {
// accessing Heroku App via ID and Keys
$0.applicationId = "truegramIDDB91"
$0.clientKey = "truegramKeyDB91"
$0.server = "http://truegram.herokuapp.com/parse"
}
// call login function
login()
Parse.initialize(with: configuration)
return true
}
func applicationWillResignActive(_ application: UIApplication) {
// Sent when the application is about to move from active to inactive state. This can occur for certain types of temporary interruptions (such as an incoming phone call or SMS message) or when the user quits the application and it begins the transition to the background state.
// Use this method to pause ongoing tasks, disable timers, and throttle down OpenGL ES frame rates. Games should use this method to pause the game.
}
func applicationDidEnterBackground(_ application: UIApplication) {
// Use this method to release shared resources, save user data, invalidate timers, and store enough application state information to restore your application to its current state in case it is terminated later.
// If your application supports background execution, this method is called instead of applicationWillTerminate: when the user quits.
}
func applicationWillEnterForeground(_ application: UIApplication) {
// Called as part of the transition from the background to the inactive state; here you can undo many of the changes made on entering the background.
}
func applicationDidBecomeActive(_ application: UIApplication) {
// Restart any tasks that were paused (or not yet started) while the application was inactive. If the application was previously in the background, optionally refresh the user interface.
}
func applicationWillTerminate(_ application: UIApplication) {
// Called when the application is about to terminate. Save data if appropriate. See also applicationDidEnterBackground:.
}
func login() {
// remember user's login
let username : String? = UserDefaults.standard.string(forKey: "username")
// if logged in
if username != nil {
let storyboard : UIStoryboard = UIStoryboard(name: "Main", bundle: nil)
let myTabBar = storyboard.instantiateViewController(withIdentifier: "tabBar") as! UITabBarController
window?.rootViewController = myTabBar
}
}
}
SignInVC.swift
import UIKit
import Parse
class signInVC: UIViewController {
// textfields
#IBOutlet weak var usernameTxt: UITextField!
#IBOutlet weak var passwordTxt: UITextField!
#IBOutlet weak var label: UILabel!
// sign in button view
#IBOutlet weak var signinBtnBlock: UIView!
// buttons
#IBOutlet weak var signInBtn: UIButton!
#IBOutlet weak var signUpBtn: UIButton!
#IBOutlet weak var forgotPasswordBtn: UIButton!
// default function
override func viewDidLoad() {
super.viewDidLoad()
// font of label (Clubbr)
label.font = UIFont(name: "gillsans-light", size: 22)
}
// clicked sign in button
#IBAction func signInBtnClick(sender: AnyObject) {
print("sign in pressed")
// hide keyboard
self.view.endEditing(true)
// if text fields are empty
if usernameTxt.text!.isEmpty || passwordTxt.text!.isEmpty {
// show alert message
let alert = UIAlertController(title: "Please", message: "fill in fields", preferredStyle: UIAlertControllerStyle.alert)
let ok = UIAlertAction(title: "OK", style: UIAlertActionStyle.cancel, handler: nil)
alert.addAction(ok)
self.present(alert, animated: true, completion: nil)
}
// login functions
PFUser.logInWithUsername(inBackground: usernameTxt.text!, password: passwordTxt.text!) { (user: PFUser?, error: Error?) -> Void in
if error == nil {
// remember user or save in app memory (did the user log in or not)
UserDefaults.standard.set(user!.username, forKey: "username")
UserDefaults.standard.synchronize()
// Call login function from AppDelegate.swift class
let appDelegate : AppDelegate = UIApplication.shared.delegate as! AppDelegate
appDelegate.login()
} else {
// show alert message
let alert = UIAlertController(title: "Error", message: error!.localizedDescription, preferredStyle: UIAlertControllerStyle.alert)
let ok = UIAlertAction(title: "OK", style: UIAlertActionStyle.cancel, handler: nil)
alert.addAction(ok)
self.present(alert, animated: true, completion: nil)
}
}
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
}
SignUpVc.swift
import UIKit
import Parse
class signUpVC: UIViewController, UIImagePickerControllerDelegate, UINavigationControllerDelegate {
// profile image
#IBOutlet weak var avaImg: UIImageView!
// textfields
#IBOutlet weak var firstnameTxt: UITextField!
#IBOutlet weak var lastnameTxt: UITextField!
#IBOutlet weak var emailTxt: UITextField!
#IBOutlet weak var passwordTxt: UITextField!
#IBOutlet weak var confirmTxt: UITextField!
// buttons
#IBOutlet weak var loginBtn: UIButton!
#IBOutlet weak var signupBtn: UIButton!
#IBOutlet weak var businessSignupBtn: UIButton!
// scroll view
#IBOutlet weak var scrollView: UIScrollView!
// resets scroll view to default size
var scrollViewHeight : CGFloat = 0
// keyboard frame size
var keyboard = CGRect()
// default func
override func viewDidLoad() {
super.viewDidLoad()
// check notifications if keyboard is shown or not
NotificationCenter.default.addObserver(self, selector: Selector(("showKeyboard:")), name: NSNotification.Name.UIKeyboardWillShow, object: nil)
NotificationCenter.default.addObserver(self, selector: Selector(("hideKeyboard:")), name: NSNotification.Name.UIKeyboardWillHide, object: nil)
// declare hide keyboard tap
let hideTap = UITapGestureRecognizer(target: self, action: Selector(("hideKeyboardTap:")))
hideTap.numberOfTapsRequired = 1
self.view.isUserInteractionEnabled = true
self.view.addGestureRecognizer(hideTap)
// profile image circle shape and custom border colour
avaImg.layer.borderWidth = 2
avaImg.layer.borderColor = UIColor.init(red: 90/255, green: 187/255, blue: 181/255, alpha: 1).cgColor
avaImg.layer.cornerRadius = avaImg.frame.height/2
avaImg.clipsToBounds = true
// declare select image tap
let avaTap = UITapGestureRecognizer(target: self, action: Selector(("loadImg:")))
avaTap.numberOfTapsRequired = 1
avaImg.isUserInteractionEnabled = true
avaImg.addGestureRecognizer(avaTap)
}
// call picker to select image
func loadImg(recognizer: UITapGestureRecognizer) {
let picker = UIImagePickerController()
picker.delegate = self
picker.sourceType = .photoLibrary
picker.allowsEditing = true
present(picker, animated: true, completion: nil)
}
// connect selected image to our image view
private func imagePickerController(picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [String : AnyObject]) {
avaImg.image = info[UIImagePickerControllerEditedImage] as? UIImage
self.dismiss(animated: true, completion: nil)
}
// hide keyboard if tapped
func hideKeyboardTap(recognizer: UITapGestureRecognizer) {
self.view.endEditing(true)
}
// show keyboard
func showKeyboard(notification: NSNotification) {
// define keyboard sizes
keyboard = ((notification.userInfo?[UIKeyboardFrameEndUserInfoKey]! as AnyObject).cgRectValue)!
//move up UI
UIView.animate(withDuration: 0.4) { () -> Void in
self.scrollView.frame.size.height = self.scrollViewHeight - self.keyboard.height
}
}
// hide keyboard
func hideKeyboard(notification: NSNotification) {
//move down UI
UIView.animate(withDuration: 0.4) { () -> Void in
self.scrollView.frame.size.height = self.view.frame.height
}
}
// clicked sign up
#IBAction func signupBtnClick(sender: AnyObject) {
print("sign up pressed")
// dismiss keyboard
self.view.endEditing(true)
// if fields are empty
if (emailTxt.text!.isEmpty || passwordTxt.text!.isEmpty || confirmTxt.text!.isEmpty || firstnameTxt.text!.isEmpty || lastnameTxt.text!.isEmpty) {
// alert pop up message
let alert = UIAlertController(title: "Please", message: "fill all fields", preferredStyle: UIAlertControllerStyle.alert)
let ok = UIAlertAction(title: "OK", style: UIAlertActionStyle.cancel, handler: nil)
alert.addAction(ok)
self.present(alert, animated: true, completion: nil)
}
// if incorrect password
if passwordTxt.text != confirmTxt.text {
// alert pop up message
let alert = UIAlertController(title: "Attention", message: "incorrect password", preferredStyle: UIAlertControllerStyle.alert)
let ok = UIAlertAction(title: "OK", style: UIAlertActionStyle.cancel, handler: nil)
alert.addAction(ok)
self.present(alert, animated: true, completion: nil)
}
// send data to related columns in server
let user = PFUser()
user.username = emailTxt.text?.lowercased()
user.email = emailTxt.text?.lowercased()
user.password = passwordTxt.text
user["firstname"] = firstnameTxt.text?.lowercased()
user["lastname"] = lastnameTxt.text?.lowercased()
// convert our image for sending to server
let avaData = UIImageJPEGRepresentation(avaImg.image!, 0.5)
let avaFile = PFFile(name: "ava.jpg", data: avaData!)
user["ava"] = avaFile
// save data in server
user.signUpInBackground { (success: Bool, error: Error?) -> Void in
if success {
print("registered")
// remember logged user
UserDefaults.standard.set(user.username, forKey: "username")
UserDefaults.standard.synchronize()
// calls login func from AppDelegate.swift class
let appDelegate : AppDelegate = UIApplication.shared.delegate as! AppDelegate
appDelegate.login()
} else {
// show alert message
let alert = UIAlertController(title: "Error", message: error!.localizedDescription, preferredStyle: UIAlertControllerStyle.alert)
let ok = UIAlertAction(title: "OK", style: UIAlertActionStyle.cancel, handler: nil)
alert.addAction(ok)
self.present(alert, animated: true, completion: nil)
}
}
}
// clicked return to log in
#IBAction func loginBtnClick(sender: AnyObject) {
self.dismiss(animated: true, completion: nil)
// dismiss keyboard
self.view.endEditing(true)
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
}
ResetPasswordVC.swift
import UIKit
import Parse
class resetPasswordVC: UIViewController {
// text field
#IBOutlet weak var emailTxt: UITextField!
// buttons
#IBOutlet weak var cancelBtn: UIButton!
#IBOutlet weak var resetBtn: UIButton!
// clicked cancel button
#IBAction func cancelBtnClick(sender: AnyObject) {
self.dismiss(animated: true, completion: nil)
// dismiss keyboard
self.view.endEditing(true)
}
// clicked reset button
#IBAction func resetBtnClick(sender: AnyObject) {
// hide keyboard
self.view.endEditing(true)
// if email text field is empty
if emailTxt.text!.isEmpty {
// show alert message
let alert = UIAlertController(title: "Email field", message: "is empty", preferredStyle: UIAlertControllerStyle.alert)
let ok = UIAlertAction(title: "OK", style: UIAlertActionStyle.cancel, handler: nil)
alert.addAction(ok)
self.present(alert, animated: true, completion: nil)
}
// request for resetting password
PFUser.requestPasswordResetForEmail(inBackground: emailTxt.text!) { (success: Bool, error: Error?) -> Void in
if success {
// show alert message
let alert = UIAlertController(title: "Reset Password Email", message: "has been sent to the email address associated with your account", preferredStyle: UIAlertControllerStyle.alert)
// of ok is pressed call self.dismiss.. function
let ok = UIAlertAction(title: "OK", style: UIAlertActionStyle.default, handler: { (UIAlertAction) -> Void in
self.dismiss(animated: true, completion: nil)
})
alert.addAction(ok)
self.present(alert, animated: true, completion: nil)
} else {
print(error?.localizedDescription)
}
}
}
// default func
override func viewDidLoad() {
super.viewDidLoad()
// tap to hide keyboard
let hideTap = UITapGestureRecognizer(target: self, action: Selector(("hideKeyboard:")))
hideTap.numberOfTapsRequired = 1
self.view.isUserInteractionEnabled = true
self.view.addGestureRecognizer(hideTap)
}
// hide keyboard function
func hideKeyboard(recognizer: UITapGestureRecognizer) {
self.view.endEditing(true)
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
}
I am sure the issue is something fairly obvious but I have only been working with Swift for 3 months and it is my first programming language. I would really appreciate the help.
Thanks for your time.
SAME ERROR
Hey guys, I've been trying my best to sort this myself but cannot get to grips with it. After the initial response from #Vadian solved the issue of the IBActions, I have still been receiving the same SIGABRT error.
Error Info
2016-10-06 17:18:33.709206 Truegram[13130:1026640] [MobileAssetError:29] Unable to copy asset information from https://mesu.apple.com/assets/ for asset type com.apple.MobileAsset.TextInput.SpellChecker
sign up pressed
2016-10-06 17:18:53.120 Truegram[13130:1026284] *** Terminating app due to uncaught exception 'NSInternalInconsistencyException', reason: 'The class PFUser must be registered with registerSubclass before using Parse.'
I think the above is most relevant to the error and this seems to be vindicated as the error occurs after pressing 'sign up'
I have also added another sign up page, specific to businesses that might be causing the issue.
BusinessSignUp.swift
import UIKit
import Parse
class BusinessSignUpVC: UIViewController, UIImagePickerControllerDelegate, UINavigationControllerDelegate {
// profile image
#IBOutlet weak var BusinessAvaImg: UIImageView!
// textfields
#IBOutlet weak var confirmTxt: UITextField!
#IBOutlet weak var passwordTxt: UITextField!
#IBOutlet weak var AddressTxt: UITextView!
#IBOutlet weak var contactNumTxt: UITextField!
#IBOutlet weak var emailTxt: UITextField!
#IBOutlet weak var businessNameTxt: UITextField!
// buttons
#IBOutlet weak var loginBtn: UIButton!
#IBOutlet weak var signupBtn: UIButton!
#IBAction func loginBtnClick(_ sender: AnyObject) {
}
// keyboard frame size
var keyboard = CGRect()
override func viewDidLoad() {
super.viewDidLoad()
// check notifications if keyboard is shown or not
NotificationCenter.default.addObserver(self, selector: #selector(BusinessSignUpVC.showKeyboard(_:)), name: NSNotification.Name.UIKeyboardWillShow, object: nil)
NotificationCenter.default.addObserver(self, selector: Selector(("hideKeyboard:")), name: NSNotification.Name.UIKeyboardWillHide, object: nil)
// declare hide keyboard tap
let hideTap = UITapGestureRecognizer(target: self, action: #selector(BusinessSignUpVC.hideKeyboardTap(_:)))
hideTap.numberOfTapsRequired = 1
self.view.isUserInteractionEnabled = true
self.view.addGestureRecognizer(hideTap)
// profile image circle shape and custom border colour
BusinessAvaImg.layer.borderWidth = 2
BusinessAvaImg.layer.borderColor = UIColor.init(red: 90/255, green: 187/255, blue: 181/255, alpha: 1).cgColor
BusinessAvaImg.layer.cornerRadius = BusinessAvaImg.frame.height/2
BusinessAvaImg.clipsToBounds = true
// declare select image tap
let avaTap = UITapGestureRecognizer(target: self, action: #selector(BusinessSignUpVC.loadImg(_:)))
avaTap.numberOfTapsRequired = 1
BusinessAvaImg.isUserInteractionEnabled = true
BusinessAvaImg.addGestureRecognizer(avaTap)
}
// call picker to select image
func loadImg(_ recognizer: UITapGestureRecognizer) {
let picker = UIImagePickerController()
picker.delegate = self
picker.sourceType = .photoLibrary
picker.allowsEditing = true
present(picker, animated: true, completion: nil)
}
// connect selected image to our image view
private func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [String : AnyObject]) {
BusinessAvaImg.image = info[UIImagePickerControllerEditedImage] as? UIImage
self.dismiss(animated: true, completion: nil)
}
// hide keyboard if tapped
func hideKeyboardTap(_ recognizer: UITapGestureRecognizer) {
self.view.endEditing(true)
}
// show keyboard
func showKeyboard(_ notification: NSNotification) {
// define keyboard sizes
keyboard = ((notification.userInfo?[UIKeyboardFrameEndUserInfoKey]! as AnyObject).cgRectValue)!
// Do any additional setup after loading the view.
}
// clicked sign up
#IBAction func signupBtnClick(_ sender: AnyObject) {
print("sign up pressed")
// dismiss keyboard
self.view.endEditing(true)
// if fields are empty
if (emailTxt.text!.isEmpty || passwordTxt.text!.isEmpty || confirmTxt.text!.isEmpty || businessNameTxt.text!.isEmpty || AddressTxt.text!.isEmpty || contactNumTxt.text!.isEmpty) {
// alert pop up message
let alert = UIAlertController(title: "Please", message: "fill all fields", preferredStyle: UIAlertControllerStyle.alert)
let ok = UIAlertAction(title: "OK", style: UIAlertActionStyle.cancel, handler: nil)
alert.addAction(ok)
self.present(alert, animated: true, completion: nil)
}
// if incorrect password
if passwordTxt.text != confirmTxt.text {
// alert pop up message
let alert = UIAlertController(title: "Attention", message: "incorrect password", preferredStyle: UIAlertControllerStyle.alert)
let ok = UIAlertAction(title: "OK", style: UIAlertActionStyle.cancel, handler: nil)
alert.addAction(ok)
self.present(alert, animated: true, completion: nil)
}
// send data to related columns in server
let businessUser = PFUser()
businessUser.username = businessNameTxt.text?.lowercased()
businessUser.email = emailTxt.text?.lowercased()
businessUser.password = passwordTxt.text
businessUser["BusinessUser"] = businessNameTxt.text?.lowercased()
businessUser["Address"] = AddressTxt.text?.lowercased()
businessUser["ContactNumber"] = contactNumTxt.text?.lowercased()
// convert our image for sending to server
let avaData = UIImageJPEGRepresentation(BusinessAvaImg.image!, 0.5)
let avaFile = PFFile(name: "ava.jpg", data: avaData!)
businessUser["ava"] = avaFile
// save data in server
businessUser.signUpInBackground { (success: Bool, error: Error?) -> Void in
if success {
print("registered")
// remember logged user
UserDefaults.standard.set(businessUser.username, forKey: "username")
UserDefaults.standard.synchronize()
// calls login func from AppDelegate.swift class
let appDelegate : AppDelegate = UIApplication.shared.delegate as! AppDelegate
appDelegate.login()
} else {
// show alert message
let alert = UIAlertController(title: "Error", message: error!.localizedDescription, preferredStyle: UIAlertControllerStyle.alert)
let ok = UIAlertAction(title: "OK", style: UIAlertActionStyle.cancel, handler: nil)
alert.addAction(ok)
self.present(alert, animated: true, completion: nil)
}
}
}
// clicked return to log in
#IBAction func businessLoginBtnClick(_ sender: AnyObject) {
self.dismiss(animated: true, completion: nil)
// dismiss keyboard
self.view.endEditing(true)
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
/*
// MARK: - Navigation
// In a storyboard-based application, you will often want to do a little preparation before navigation
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
// Get the new view controller using segue.destinationViewController.
// Pass the selected object to the new view controller.
}
*/
}
This has now taken me a couple of days attempting to fix, so I would be very appreciative if anyone could help.
The crucial information is
[Truegram.signUpVC signupBtnClick:]: unrecognized selector sent to instance 0x7f9d0700cff0'
In Swift 3 IBActions are supposed to be declared with an underscore to omit the parameter label.
#IBAction func signupBtnClick(_ sender: AnyObject)
In my swift app I have a UIViewController with a single button.
This button invokes a function that calls a popup that disappears after 3 seconds. Also, after that time it prints a message to the console. The code of this function is as follows:
func showAlertMsg(title: String, message: String){
let alertController = UIAlertController(title: title, message: message, preferredStyle: .Alert)
self.presentViewController(alertController, animated: true, completion: nil)
let delay = 3.0 * Double(NSEC_PER_SEC)
let time = dispatch_time(DISPATCH_TIME_NOW, Int64(delay))
dispatch_after(time, dispatch_get_main_queue(), {
alertController.dismissViewControllerAnimated(true, completion: nil)
print("popup disappeared")
})
}
That works fine, but I wanted to introduce some improvement. I wanted to add there a button that will cancel this popup immediately and then avoid displaying the message in the console. Is there a way of displaying such popup to the user? Also - is there a way of showing in this popup message the counter with number of seconds running out that shows how much time is left until the popup disappears?
You can use an NSTimer to decrement a counter, update the alert view and dismiss the alert view when the counter reaches 0. This code is adapted from my Objective-C answer
class ViewController: UIViewController {
var alertController: UIAlertController?
var alertTimer: NSTimer?
var remainingTime = 0
var baseMessage: String?
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view, typically from a nib.
}
override func viewDidAppear(animated: Bool) {
super.viewDidAppear(animated)
self.showAlertMsg("Test Alert", message: "This will disappear in ", time: 5)
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
func showAlertMsg(title: String, message: String, time: Int) {
guard (self.alertController == nil) else {
print("Alert already displayed")
return
}
self.baseMessage = message
self.remainingTime = time
self.alertController = UIAlertController(title: title, message: self.alertMessage(), preferredStyle: .Alert)
let cancelAction = UIAlertAction(title: "Cancel", style: .Cancel) { (action) in
print("Alert was cancelled")
self.alertController=nil;
self.alertTimer?.invalidate()
self.alertTimer=nil
}
self.alertController!.addAction(cancelAction)
self.alertTimer = NSTimer.scheduledTimerWithTimeInterval(1.0, target: self, selector: #selector(ViewController.countDown), userInfo: nil, repeats: true)
self.presentViewController(self.alertController!, animated: true, completion: nil)
}
func countDown() {
self.remainingTime -= 1
if (self.remainingTime < 0) {
self.alertTimer?.invalidate()
self.alertTimer = nil
self.alertController!.dismissViewControllerAnimated(true, completion: {
self.alertController = nil
})
} else {
self.alertController!.message = self.alertMessage()
}
}
func alertMessage() -> String {
var message=""
if let baseMessage=self.baseMessage {
message=baseMessage+" "
}
return(message+"\(self.remainingTime)")
}
}
Just in case someone needs it, this is a Swift 4 version of the #Paulw11 solution
import UIKit
class ViewController: UIViewController {
var alertController: UIAlertController?
var alertTimer: Timer?
var remainingTime = 0
var baseMessage: String?
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view, typically from a nib.
}
override func viewDidAppear(_ animated: Bool) {
super.viewDidAppear(animated)
self.showAlertMsg(title: "Test Alert", message: "This will disappear in ", time: 5)
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
func showAlertMsg(title: String, message: String, time: Int) {
guard (self.alertController == nil) else {
print("Alert already displayed")
return
}
self.baseMessage = message
self.remainingTime = time
self.alertController = UIAlertController(title: title, message: self.alertMessage(), preferredStyle: .alert)
let cancelAction = UIAlertAction(title: "Cancel", style: .cancel) { (action) in
print("Alert was cancelled")
self.alertController=nil;
self.alertTimer?.invalidate()
self.alertTimer=nil
}
self.alertController!.addAction(cancelAction)
self.alertTimer = Timer.scheduledTimer(timeInterval: 1.0, target: self, selector: #selector(ViewController.countDown), userInfo: nil, repeats: true)
self.present(self.alertController!, animated: true, completion: nil)
}
#objc func countDown() {
self.remainingTime -= 1
if (self.remainingTime < 0) {
self.alertTimer?.invalidate()
self.alertTimer = nil
self.alertController!.dismiss(animated: true, completion: {
self.alertController = nil
})
} else {
self.alertController!.message = self.alertMessage()
}
}
func alertMessage() -> String {
var message=""
if let baseMessage=self.baseMessage {
message=baseMessage+" "
}
return(message+"\(self.remainingTime)")
}
}
I know this directly doesn't answer your question, but have you considered using MBProgressHUD SCLAlertView? They both offer functions that allow you to display an alert that disappears after a set amount of time. SCLAlertView allows the user to cancel immediately where as MBProgressHUD does not. If you want more info on how to implement these, let me know so I can add more info!
There are many questions on Stack concerning this issue, but none of them seem to solve the issue I'm having.
I am using ParseUI for the login and signup portion of my application. What I would like to have happen is for a UIAlertController to be presented when a user (for example) does not enter in any text in the username and password fields.
Here is the code for my MasterViewController:
class MasterViewController: UIViewController, PFLogInViewControllerDelegate,
PFSignUpViewControllerDelegate {
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view.
}
override func viewDidAppear(animated: Bool) {
super.viewDidAppear(animated)
if (PFUser.currentUser() == nil) {
var logInViewController = LoginViewController()
logInViewController.delegate = self
var signUpViewController = SignUpViewController()
signUpViewController.delegate = self
logInViewController.signUpController = signUpViewController
self.presentViewController(logInViewController, animated: true, completion: nil)
}
}
func logInViewController(logInController: PFLogInViewController,
shouldBeginLogInWithUsername username: String, password: String) -> Bool {
if (!username.isEmpty || !password.isEmpty) {
return true
} else {
let alertController = UIAlertController(title: "Failed to login.",
message: "Login Failure. Please try again.", preferredStyle: .Alert)
let defaultAction = UIAlertAction(title: "OK", style: .Default, handler: nil)
alertController.addAction(defaultAction)
self.presentViewController(alertController, animated: true, completion: nil)
return false
}
}
func logInViewController(logInController: PFLogInViewController,
didFailToLogInWithError error: NSError?) {
println("Failed to log in.")
}
func signUpViewController(signUpController: PFSignUpViewController,
shouldBeginSignUp info: [NSObject : AnyObject]) -> Bool {
if let password = info["password"] as? String {
return count(password.utf16) >= 8
} else {
return false
}
}
func signUpViewController(signUpController: PFSignUpViewController,
didFailToSignUpWithError error: NSError?) {
println("Failed to sign up.")
}
func logInViewController(logInController: PFLogInViewController,
didLogInUser user: PFUser) {
let installation = PFInstallation.currentInstallation()
installation["user"] = PFUser.currentUser()
installation.saveInBackground()
self.dismissViewControllerAnimated(true, completion: nil)
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
func signUpViewControllerDidCancelSignUp(signUpController:
PFSignUpViewController) {
println("User dismissed signup.")
}
}
After reading another user's answer which seemed like it would be the answer, I added the following class to my workspace:
import Foundation
class AlertHelper: NSObject {
func showAlert(fromController controller: MasterViewController) {
var alert = UIAlertController(title: "abc", message: "def", preferredStyle: .Alert)
controller.presentViewController(alert, animated: true, completion: nil)
}
}
And then modified my method accordingly:
func logInViewController(logInController: PFLogInViewController,
shouldBeginLogInWithUsername username: String, password: String) -> Bool {
if (!username.isEmpty || !password.isEmpty) {
return true
} else {
let alertController = UIAlertController(title: "Failed to login.",
message: "Login Failure. Please try again.", preferredStyle: .Alert)
let defaultAction = UIAlertAction(title: "OK", style: .Default, handler: nil)
alertController.addAction(defaultAction)
var alert = AlertHelper()
alert.showAlert(fromController: self)
return false
}
}
At this point I'm not quite sure what else to do. One thought I had was to programmatically add a UILabel to my LoginViewController and SignUpViewController and change the content based on the errors (or lack thereof) for the user login and signup, but I would like to have alerts.
EDIT: This is the code in my LoginViewController. It subclassed in order to customize the appearance. The code for my SignUpViewController is almost identical.
import UIKit
import Parse
import ParseUI
class LoginViewController: PFLogInViewController {
override func viewDidLoad() {
super.viewDidLoad()
view.backgroundColor = ckPurple
let label = UILabel()
label.textColor = UIColor.whiteColor()
label.text = "Welcome."
label.sizeToFit()
logInView?.logo = label
// Do any additional setup after loading the view.
}
The problem is that you present a login view controller from your master view controller, which removes the master view controller from the view hierarchy. You then attempt to present an alert view controller from your master view controller, but you need to present from a view controller in the view hierarchy. Try presenting the alert from your login view controller instead.
loginController.presentViewController(alertController, animated: true, completion: nil)