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Editorial Team
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Asked: 2026-06-06T22:54:39+00:00

I’m trying to pass a NSString text to a UIViewController in button click event

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I’m trying to pass a NSString text to a UIViewController in button “click” event in iOS. I wrote following code.

self.detailViewController = [[DetailViewController alloc] initWithNibName:@"DetailViewController" bundle:nil];

self.detailViewController.modalTransitionStyle = UIModalTransitionStyleCrossDissolve;
[self presentModalViewController:self.detailViewController animated:YES];

self.detailViewController.urlAddress = @"http://www.google.com";

I’ve already declared urlAddress property in detailViewController.
After I tested with NSLog in viewWillAppear, it shows only null values, not the urlAddress string. How can I solve it?

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1 Answer

  1. Editorial Team

    Note the order of methods being called:

    1. initWithNibName
    2. viewDidLoad
    3. viewWillAppear

    Your string is changed only after all three have done their work.

    Change your code to:

    self.detailViewController = [[DetailViewController alloc] initWithNibName:@"DetailViewController" bundle:nil];
self.detailViewController.urlAddress = @"http://www.google.com";
self.detailViewController.modalTransitionStyle = UIModalTransitionStyleCrossDissolve;
[self presentModalViewController:self.detailViewController animated:YES]; //Triggers viewWillAppear eventually
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