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POPass data back to previous viewcontroller
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  1. POPass data back to previous viewcontroller
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    copied!<p>I am trying to pass data BACK TO previous viewController. </p> <p>Does anyone know how to pass data back from ViewController B to ViewController A? So I want a string to go 'from' BIDAddTypeOfDealViewController to BIDDCCreateViewController. A user edits viewController B and I want that edited data back in ViewController A where I then use it. </p> <p>I am using the 'passing data back' section of <a href="https://stackoverflow.com/a/9736559/">this answer</a>. How mine differs: Point 3 and 6 just mentions when views are popped so I have put that code in viewWillDisappear. I think that is correct? Also on Point 6 I did not initialise with nib as that is old. I'm using storyboards. And I did not add that last line as I do not believe I would have to push it. Pressing a button on my storyboard already takes me forward. </p> <p>I think the problem may arise in BIDDCCreateViewController, I have the method but I cannot run it. To run a method it should go [self method]. I am unable to do that. Well that is just what I am guessing. </p> <p>It compiles and runs fine just nothing is logged, so I don't know if it works. </p> <p>UPDATE: I am unable to get the 'sendDataToA' method to execute. </p> <pre><code>#import &lt;UIKit/UIKit.h&gt; #import "BIDAddTypeOfDealViewController.h" @interface BIDDCCreateViewController : UIViewController @property (strong, nonatomic) NSString *placeId; - (IBAction)gotoBViewController:(id)sender; @end #import "BIDDCCreateViewController.h" #import "BIDAddTypeOfDealViewController.h" @implementation BIDDCCreateViewController - (void)viewDidLoad { [super viewDidLoad]; // Do any additional setup after loading the view. NSLog(@"SUCCESSFULLY PASSED PLACE ID: %@", self.placeId); } -(void)sendDataToA:(NSString *)myStringData { NSLog(@"Inside sendDataToA"); UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Your string Data Showing" message:myStringData delegate:self cancelButtonTitle:@"Ok " otherButtonTitles:nil]; [alert show]; } - (IBAction)gotoBViewController:(id)sender { NSLog(@"pressed"); BIDAddTypeOfDealViewController *bidAddType = [[BIDAddTypeOfDealViewController alloc]init]; bidAddType.delegate = self; } @end @protocol senddataProtocol &lt;NSObject&gt; -(void)sendDataToA:(NSString *)myStringData; @end #import &lt;UIKit/UIKit.h&gt; @interface BIDAddTypeOfDealViewController : UIViewController &lt;UITextFieldDelegate&gt;//Using this delegate for data a user inputs @property(nonatomic,assign)id delegate; //other textfield outlets not relevant - (IBAction)chooseDiscountDeal:(id)sender; @end #import "BIDAddTypeOfDealViewController.h" @interface BIDAddTypeOfDealViewController () @end @implementation BIDAddTypeOfDealViewController @synthesize delegate; - (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil { self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil]; if (self) { // Custom initialization } return self; } - (void)viewDidLoad { [super viewDidLoad]; } -(void)viewWillDisappear:(BOOL)animated { [delegate sendDataToA:@"Apple"]; } @end </code></pre>
 

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