CODEWITHSUNDEEP
iphoneiosobjective-cxcodecocoa-touch
Mani
Mani

Reputation: 1310

How can I call the one method in all the view controllers?

How can I call the one method in all the view controllers?

One method in viewcontroller1 like,

- (void)doSearch
{
   NSLog(@"Search..!");
}

I want to call doSearch method from viewcontroller2, viewcontroller3, viewcontroller4, viewcontroller5, etc.

How to do this?

Upvotes: 0

Views: 1056

Answers (7)

Lithu T.V
Lithu T.V

Reputation: 20021

The best way is to make a separate header file make this method a class method and you can call this anywhere in the project by importing the class.And you can include this class into your pch file so that import can be avoided from all VCs

class.h

+ (void)doSearch
{
   NSLog(@"Search..!");
}

in ViewControllers

#import "class.h"

    
-(void)someMethod
{
    [class doSearch];
}

Upvotes: 0

viral
viral

Reputation: 4208

You can declare this method in AppDelegate.h. like

- (void)doSearch;

And Implement it in AppDelegate.m like

- (void)doSearch
{
    //Your Search Logic
}

Then, Create AppDelegate instance like 

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

Make Your Project's .pch file look like following:

#ifdef __OBJC__

    #import <Foundation/Foundation.h>
    #import <UIKit/UIKit.h>

    #import "AppDelegate.h"
    AppDelegate *appDelegate;

#endif

Now, From Any ViewController, You can call method like:

[appDelegate doSearch];

Happy Coding.

NOTE: Personally, I avoid this kind of implementation in AppDelegate Class. I use Singleton Object Pattern for this kind of purpose. But, Given is the quickest way.

___________EDIT____________

Add a New Class file of NSObject type: Name it CommonMethod (or whatever you want)

in CommonMethod.h

@interface CommonMethods : NSObject
+ (CommonMethods *)sharedObject;
+ (void)doSearch;

in CommonMethod.m

#import "CommonMethods.h"

@implementation CommonMethods

+ (CommonMethods *)sharedObject 
{
    static dispatch_once_t once;
    static CommonMethods *sharedObject;
    dispatch_once(&once, ^ { sharedObject = [[CommonMethods alloc] init]; });
    return sharedObject;
}

+ (BOOL)doSearch
{
    // Your Search Logic.
}

Now, Add #import "CommonMethods.h" to your project's .pch file.

And You are all set to go...!!!

Method Call (in any of your viewController): [CommonMethods doSearch];

Upvotes: 0

nsgulliver
nsgulliver

Reputation: 12671

You can declare it in separate class and instantiate that class in all viewControllers, or you could define this method in your AppDelegate and call in all your viewController. you could access the AppDelegate in your ViewControllers by getting its instance like this

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

and finally call the method like this 

[self.appDelegate doSearch];

Generally it is preferable to declare all your methods or data which is shared through the application in a separate class and use this class. I usually use singelton Object class in my application, define all the shared data in that and finally access in all classes

here is example of singelton class

MyData.h

@interface MyData : NSObject

+(MyData*)getInstance;
-(void)search;

@end

MyData.m

#import "MyData.h"

@implementation MyData



static MyData *instance =nil;

+(MyData *)getInstance
{

    @synchronized(self)
    {
    if(instance==nil)
        {

        instance= [[MyData alloc]init];
        }
    }
    return instance;
}

-(void)search {
    NSLog(@"search");
}

@end

finally in your viewController 

  MyData *myData=[MyData getInstance];
  [myData search];

Upvotes: 1

Hossam Ghareeb
Hossam Ghareeb

Reputation: 7113

The best way to make AbstractViewController and inside it add all your common behaviors or methods. Any ViewController will inherits from the Abstract and can call any common Method

Upvotes: 0

swiftBoy
swiftBoy

Reputation: 35783

You may like to read below tutorial

Global functions and variables in Objective C

or You can create methods in the appDelegate class that you can access through all your app. For example, in your AppDelegate.h you have declared this method as follow:

-(void)myMethod;

In your AppDelegate.m, you define it as:

-(void)myMethod
{
    NSLog(@"myMethod is getting called");
}

From any other classes (Master or Detail, etc.), you access myMethod by:

#import "AppDelegate.h"

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

Upvotes: 0

iPatel
iPatel

Reputation: 47059

Add your method to AppDelegate.m file

- (void)doSearch
{
   NSLog(@"Search..!");
}

And Add #import "AppDelegate.h" In UIViewController that you want to call :

You can call method by,

AppDelegate *del = (AppDelegate *)[[UIApplication sharedApplication] delegate];
[del performSelector:@selector(doSearch) withObject:nil afterDelay:0];

From Any UIViewController

Upvotes: 0

Rok Jarc
Rok Jarc

Reputation: 18865

Put all controllers in an NSArray *, lets say it is called controllerArray.

Then you can make all controllers perform selector with:

[controllerArray makeObjectsPerformSelector:@selector(doSearch)];

Upvotes: 0

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