How to create AppDelegate shared Instance in iOS?

Question

How to create sharedInstance of AppDelegate and use in my Application anywhere.

use this macro #define myappDelegate ((AppDelegate *)[[UIApplication sharedApplication] delegate]) — Smile, Dec 23 '15 at 10:39
AppDelegate *appdelegate =((AppDelegate *)[[UIApplication sharedApplication] delegate]) — Smile, Dec 23 '15 at 10:40
AppDelegate is already shared throughout the app, you can use it's instance like [[UIApplication sharedApplication] delegate]; — channi, Dec 23 '15 at 10:40

Anoop Vaidya · Accepted Answer · 2015-12-23T11:09:32.950

10

Use like this:

In the AppDelegate.h

+ (AppDelegate *)sharedAppDelegate;

In AppDelegate.m

+ (AppDelegate *)sharedAppDelegate{
    return (AppDelegate *)[UIApplication sharedApplication].delegate;
}

edited Dec 23 '15 at 11:09

answered Dec 23 '15 at 10:40

Anoop Vaidya

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How to deal with the info that appears on the return line? _[UIApplication delegate] must be used from main thread only._ – Yuliwee Oct 30 '18 at 09:27

score 3 · Answer 2 · edited May 23 '17 at 11:33

3

declare the statement in Constants.h

#define myappDelegate ((AppDelegate *)[[UIApplication sharedApplication] delegate])

and you can use myappDelegate any where in the app if you declare the Constants.h in .pch file

Check this for PCH for Xcode 6

edited May 23 '17 at 11:33

Community

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answered Dec 23 '15 at 10:42

Smile

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score 1 · Answer 3 · answered Dec 23 '15 at 10:42

Use this in every ViewControllers

#import "AppDelegate.h"

  AppDelegate *appDelegate = (AppDelegate *)[[UIApplication sharedApplication] delegate];

Or you can create a method in ViewController subclass & use it in every ViewControllers.

-(AppDelegate*) app
{
   return (AppDelegate*) [[UIApplication sharedApplication] delegate];
}

In a subclass of UIViewController -- then make that the base-class of all of your view controllers.

Then, [self app] works, and you don't have to keep a reference.

score 1 · Answer 4 · answered Dec 23 '15 at 10:48

you can use like bellow

In Objective C : you can add following line in your .pch file and user where ever you want

#define myAppDelegate (AppDelegate *)[[UIApplication sharedApplication] delegate]

and use like myAppDelegate.someVariable or [myAppDelegate somemethod]

In Swift

Swift >= 1.2 (Introduced with Xcode 6.3)

let myAppDelegate = UIApplication.sharedApplication().delegate as! AppDelegate
let aVariable = myAppDelegate.someVariable

Swift < 1.2

let myAppDelegate = UIApplication.sharedApplication().delegate as AppDelegate
let aVariable = myAppDelegate.someVariable

score 0 · Answer 5 · answered Dec 23 '15 at 10:41

0

Use this:

+ (AppDelegate *)appDelegate
{
    return (AppDelegate *)[[UIApplication sharedApplication] delegate];
}

answered Dec 23 '15 at 10:41

iAnurag

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score 0 · Answer 6 · answered Jul 02 '17 at 00:34

Other answers use UIApplication.shared.delegate, but you need to write always 'as! AppDelegate', so a Swift more clean code:

// AppDelegate.swift

static var shared = AppDelegate() // Declare a static variable as an instance of AppDelegate

func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool {

    // Singleton
    AppDelegate.shared = self // set the value of "shared" to the current instance

    return true
}

Usage

AppDelegate.shared

score -3 · Answer 7 · edited Feb 27 '17 at 19:07

-3

Any ViewController it is working this appDelegate including Xcode 8 also

AppDelegate *appDelegate = (AppDelegate *)[[UIApplication sharedApplication] delegate];

edited Feb 27 '17 at 19:07

FelixSFD

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answered Feb 27 '17 at 17:19

AnkiReddy

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How to create AppDelegate shared Instance in iOS?

7 Answers7