How to get a value from one view controller to another view controller?

Question

//viewcontrollerA.h

@class viewA;
@protocol viewADelegate<NSObject>
- (void)emailidgetmethod:(NSString *)string;

@end

@interface Login : UIViewController
{

}
@property (nonatomic,assign) id <viewADelegate> delegate;
@end

//viewcontrollerA.m

#import "viewcontrollerA.h"
 @synthesize delegate;

 - (void)viewDidLoad 
  {
   [self.delegate emailidgetmethod:@"myString"];
  }

//viewcontrollerB.h

  #import "viewcontrollerA.h"
  @interface viewcontrollerB : UIViewController<viewADelegate>
  @end

//viewcontrollerB.m #import "viewcontrollerB.h"

   - (void)viewDidLoad 
   {
       viewcontrollerA *viewA= [[viewcontrollerA alloc]init];
       [viewA setDelegate:self];
   }

 - (void)emailidgetmethod:(NSString *)string
   {
       NSLog(@"Delegatehomemethod %@",string); // This is not calling.
   }

what do you want you want to send string from one view controller to another? — Pradumna Patil, Jul 14 '15 at 11:29
i want to access the view controllerA from view controllerB without getinto the view controllerA. — Deepak ravi, Jul 14 '15 at 11:31
you can save valu in User Default & then get it from other View Controller. — Mehul, Jul 14 '15 at 11:32
@Deepakravi, viewController A is then in Navigation Array or not ? — Mehul, Jul 14 '15 at 11:33
viewControllerA is not a Navigation Array. i want to access the data in view controllerA data without pushing viewcontrollerA screen. — Deepak ravi, Jul 14 '15 at 12:02

score -1 · Answer 1 · answered Jul 14 '15 at 11:36

-1

Method doesn't calling because viewDidLoad method of viewControllerA doesn't calling. You should add viewControllerA as child to viewControllerB and add view of viewContollerA as subview of viewControllerB's view

answered Jul 14 '15 at 11:36

Sergei Stralenia

855
7
16

score -1 · Answer 2 · answered Jul 14 '15 at 11:40

I think, your ViewControllerA is loading first and then you navigate to ViewControllerB Controllers. If that is your case, your delegate function will not call because as you can see, when your ViewControllerA is loaded and viewDidLoad is called, your delegate is nil so it will not able to call function.

So you need to load ViewControllerB first and navigate to ViewControllerA

Thanks

score -1 · Answer 3 · answered Jul 14 '15 at 11:54

You are calling an instance method which is declared in ViewControllerA in another ViewController. This won't be called because you can only access that method within ViewControllerA. You can change the -(void) to +(void), to make it a class method. Then in your ViewControllerB, create an instance of ViewControllerAViewControllerA *VCA = [[ViewControllerA alloc] init]; Then you can access this method within ViewControllerA.[VCA methodName];

How to get a value from one view controller to another view controller?

3 Answers3