iOS - Calling App Delegate method from ViewController

Question

What I am trying to do is click a button  that was created in code  and have it call up a different view controller then have it run a function in the new view controller   I know it could be done relatively easily in IB but that isn t an option   An example of what I want to do would be if you had two view controllers one with a splash screen of house  The other view controller had a walk through of the house on it that you could go through all the rooms in a set order  The splash screen would have buttons for each room that would allow you to jump to any point on the walk through

User · Answer

And if anyone is wondering how to do this in swift   if let myDelegate   UIApplication sharedApplication   delegate as  AppDelegate      myDelegate someMethod

User · Answer

If someone need the same in Xamarin  Xamarin ios   Monotouch   this worked for me   var myDelegate   UIApplication SharedApplication Delegate as AppDelegate     Require using UIKit

User · Answer

Even if technically feasible  is NOT a good approach  When You say   The splash screen would have buttons for each room that would allow you to jump to any point on the walk through   So you want to pass through appdelegate to call these controllers via tohc events on buttons   This approach does not follow Apple guidelines and has a lot of drawbacks

User · Answer

A lot of good answers are already added  Though I want to add something which suits me most of the time    define kAppDelegate   YourAppDelegate     UIApplication sharedApplication  delegate      and thats it  Use it throughout the application just like a constant   e g    kAppDelegate methodName     Don t forget to import yourAppDelegate h in corresponding  pch or macros file

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Just Follow these steps  1 import your app delegate in your class where you want app delegate object    import  YourAppDelegate h    2 inside your class create an instance of your app delegate object Its basically a singleton    YourAppDelegate  appDelegate   YourAppDelegate    UIApplication sharedApplication  delegate    3 Now invoke method using selector  if  appDelegate respondsToSelector  selector yourMethod               appDelegate yourMethod           or directly by   appDelegate yourMethod     for swift  let appdel   AppDelegate   UIApplication shared delegate as  AppDelegate   i will recommend the first one  Run and Go

User · Answer

This is how I do it      UIApplication sharedApplication  delegate  performSelector  selector nameofMethod      Dont forget to import    import  AppDelegate h

User · Answer

And in case you need access to your WatchKit extension delegate from a view controller on watchOS   extDelegate   WKExtension sharedExtension   delegate as WKExtensionDelegate

User · Answer

Update for Swift 3 0 and higher        Step 1 - Create a method in AppDelegate swift    func someMethodInAppDelegate          print  someMethodInAppDelegate called       calling above method from your controller by followings        Step 2 - Getting a reference to the AppDelegate  amp  calling the require method       if let appDelegate   UIApplication shared delegate as  AppDelegate        appDelegate someMethodInAppDelegate       Output

User · Answer

You can add  define uAppDelegate  AppDelegate     UIApplication sharedApplication  delegate  in your project s Prefix pch file and then call any method of your AppDelegate in any UIViewController with the below code    uAppDelegate showLoginView

User · Answer

NSObject  lt UIApplicationDelegate gt    universalAppDelegate          NSObject  lt UIApplicationDelegate gt          UIApplication sharedApplication   delegate      It avoid having to include your AppDelegate h everywhere   It s a simple cast that goes a long way  allowing to develop independent Controller and reuse them elsewhere without to worry about class name and so on     Enjoy

User · Answer

You can access the delegate like this   MainClass  appDelegate    MainClass     UIApplication sharedApplication  delegate     Replace MainClass with the name of your application class   Then  provided you have a property for the other view controller  you can call something like    appDelegate viewController someMethod

User · Answer

In 2020  iOS13  xCode 11 3  What is working for Objective-C is    import  AppDelegate h   AppDelegate  appDelegate    AppDelegate     UIApplication sharedApplication  delegate     It s working for me  i hope the same to you    D

User · Answer

Sounds like you just need a UINavigationController setup   You can get the AppDelegate anywhere in the program via  YourAppDelegateName  blah    YourAppDelegateName    UIApplication sharedApplication delegate     In your app delegate you should have your navigation controller setup  either via IB or in code     In code  assuming you ve created your  House overview  viewcontroller already it would be something like this in your AppDelegate didFinishLaunchingWithOptions     self m window      UIWindow alloc initWithFrame   UIScreen mainScreen bounds  autorelease   self m navigationController      UINavigationController alloc initWithRootViewController homeViewController autorelease    m window addSubview self m navigationController view     After this you just need a viewcontroller per  room  and invoke the following when a button click event is picked up     YourAppDelegateName  blah    YourAppDelegateName    UIApplication sharedApplication delegate    blah m navigationController pushViewController newRoomViewController animated YES     I ve not tested the above code so forgive any syntax errors but hope the pseudo code is of help

[ios] iOS - Calling App Delegate method from ViewController

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