Present and dismiss modal view controller

Question

Can anyone give me the example code that I can use to first present a modal view controller  then dismiss it  This is what I have been trying   NSLog        blue modalViewController    blue presentModalViewController red animated YES   NSLog        blue modalViewController    blue dismissModalViewControllerAnimated YES   NSLog        blue modalViewController     This code is in viewDidLoad   blue  and  red  are both subclasses of UIViewController   I expect that I will show the red view and then immediately hide it  with some animation  However this piece of code only presents the modal view and does not dismiss it  Any idea  The first log shows  null  while the two other logs show  lt RedViewController  0x3d21bf0 gt   Another point is  if I put this code in applicationDidFinishLaunching  the red view does not appear at all  and all logs get  null

User · Answer

Swift  self dismissViewControllerAnimated true  completion  nil

User · Answer

The easiest way to do it is using Storyboard and a Segue   Just create a Segue from the FirstViewController  not the Navigation Controller  of your TabBarController to a LoginViewController with the login UI and name it  showLogin    Create a method that returns a BOOL to validate if the user logged in and or his her session is valid    preferably on the AppDelegate  Call it isSessionValid   On your FirstViewController m override the method viewDidAppear as follows   -  void viewDidAppear  BOOL animated        super viewDidAppear animated        if  self isSessionValid   NO            self performSegueWithIdentifier   showLogin  sender self             Then if the user logged in successfully  just dismiss or pop-out the LoginViewController to show your tabs   Works 100    Hope it helps

User · Answer

Swift Updated for Swift 3  Storyboard Create two View Controllers with a button on each  For the second view controller  set the class name to SecondViewController and the storyboard ID to secondVC  Code ViewController swift import UIKit class ViewController  UIViewController         IBAction func presentButtonTapped   sender  UIButton                     let storyboard   UIStoryboard name   quot Main quot   bundle  nil          let myModalViewController   storyboard instantiateViewController withIdentifier   quot secondVC quot           myModalViewController modalPresentationStyle   UIModalPresentationStyle fullScreen         myModalViewController modalTransitionStyle   UIModalTransitionStyle coverVertical         self present myModalViewController  animated  true  completion  nil           SecondViewController swift import UIKit class SecondViewController  UIViewController             IBAction func dismissButtonTapped   sender  UIButton            self dismiss animated  true  completion  nil           Source   Documentation SO answer

User · Answer

The easiest way i tired in xcode 4 52 was to create an additional view and connect them by using segue modal control drag the button from view one to the second view  chose Modal    Then drag in a button to second view or the modal view that you created  Control and drag this button to the header file and use action connection  This will create an IBaction in your controller m file  Find your button action type in the code    self dismissViewControllerAnimated YES completion nil

User · Answer

First of all  when you put that code in applicationDidFinishLaunching  it might be the case that controllers instantiated from Interface Builder are not yet linked to your application  so  red  and  blue  are still nil    But to answer your initial question  what you re doing wrong is that you re calling dismissModalViewControllerAnimated  on the wrong controller  It should be like this    blue presentModalViewController red animated YES    red dismissModalViewControllerAnimated YES     Usually the  red  controller should decide to dismiss himself at some point  maybe when a  cancel  button is clicked   Then the  red  controller could call the method on self    self dismissModalViewControllerAnimated YES     If it still doesn t work  it might have something to do with the fact that the controller is presented in an animation fashion  so you might not be allowed to dismiss the controller so soon after presenting it

User · Answer

presentModalViewController   MainViewController  mainViewController   MainViewController alloc init    self navigationController presentModalViewController mainViewController animated YES     dismissModalViewController    self dismissModalViewControllerAnimated YES

[ios] Present and dismiss modal view controller

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[ios] Present and dismiss modal view controller

Examples related to ios

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