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POCustom delegation to pass data between tab bar view in iOS not working
 

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  1. POCustom delegation to pass data between tab bar view in iOS not working
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    <p>I am facing a problem related to delegation.I have 2 tabView. In first tabview i have 2 textfield and a button(to trigger the delegate method) and in the second tabview i have 2 label to display the content of textfield in the first tabview.Whats wrong with my code???</p> <p>For first tabviewA the .h file</p> <pre><code>#import &lt;UIKit/UIKit.h&gt; @class ViewControllerA; @protocol ViewControllerADelegate &lt;NSObject&gt; -(void)sayHello:(ViewControllerA*)viewController; @end @interface ViewControllerA : UIViewController&lt;UITextFieldDelegate&gt; @property (nonatomic,strong)IBOutlet UITextField *textFieldFirst; @property (nonatomic,strong)IBOutlet UITextField *textFieldSecond; @property (nonatomic,strong)id&lt;ViewControllerADelegate&gt;delegate; -(IBAction)next:(id)sender; @end </code></pre> <p>and the .m file </p> <pre><code>#import "ViewControllerA.h" @interface ViewControllerA () @end @implementation ViewControllerA @synthesize textFieldFirst=_textFieldFirst; @synthesize textFieldSecond=_textFieldSecond; @synthesize delegate=_delegate; - (void)viewDidLoad { [super viewDidLoad]; _textFieldFirst.delegate=self; _textFieldSecond.delegate=self; } - (BOOL)textFieldShouldReturn:(UITextField *)textField { [textField resignFirstResponder]; return NO; } -(IBAction)next:(id)sender { [self.delegate sayHello:self]; } @end </code></pre> <p>And for the second tabbarViewB the .h file</p> <pre><code>#import &lt;UIKit/UIKit.h&gt; #import "ViewControllerA.h" @interface ViewControllerB : UIViewController&lt;ViewControllerADelegate&gt; @property (nonatomic,strong)IBOutlet UILabel *labelFirst; @property (nonatomic,strong)IBOutlet UILabel *labelSecond; @end </code></pre> <p>and the .m file</p> <pre><code>#import "ViewControllerB.h" @interface ViewControllerB () @end @implementation ViewControllerB @synthesize labelFirst=_labelFirst; @synthesize labelSecond=_labelSecond; - (void)viewDidLoad { [super viewDidLoad]; ViewControllerA *viewControllerA=[self.tabBarController.viewControllers objectAtIndex:0]; viewControllerA.delegate=self; // Do any additional setup after loading the view. } -(void)sayHello:(ViewControllerA *)viewController { _labelFirst.text=viewController.textFieldFirst.text; _labelSecond.text=viewController.textFieldSecond.text; } @end </code></pre> <p>N.B: I have tried tabView B to tabview A with the same process and that worked fine. The reverse (i.e from A to B)is not working at all.Thanks</p>
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    1. USuser7388
    1. USTunvir Rahman Tusher
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    1. COWhat exactly is the problem you're facing and did you check that "sayHello" is called on ViewControllerB and are the text values not nil?
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      1. POCustom delegation to pass data between tab bar view in iOS not working
      1. USd4Rk
    2. COAt what point is it 'not working'? Have you put breakpoints in the code and check that the next: IBACtion is being called and if so whether the delegate is set correctly etc?
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      1. POCustom delegation to pass data between tab bar view in iOS not working
      1. USMike Pollard
    3. COIf ViewControllerA is the first thing to be displayed, has ViewControllerB had any chance to set itself as a delegate?
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      1. POCustom delegation to pass data between tab bar view in iOS not working
      1. USPhillip Mills
 

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