CODEWITHSUNDEEP
cocoa-touchios6uiviewcontrolleruibutton
vanya
vanya

Reputation: 59

How to navigate to the next ViewController programmatically when the a button is pressed?

I am new to iPhone apps development. In my code, in first ViewController1 I have a textfield and a ok- button. So here

  1. When I click ok button without entering a string, it shows an alert message.
  2. When I enter the string and then press ok button, it should navigate to next ViewController2.

I am able to do the 1st part correctly when I have not connected the ok-button to the ViewController2 in Interface Builder. But when I connect, it navigates and then shows alert message. Please tell me how to navigate to ViewController2 programmatically after I enter the string and press ok button.

This is how my code looks for Ok- button:

-(IBAction) okButton: (id) sender
{
    if([textfield.text isEqualToString:@""])
    {
        UIAlertView *alert= [[UIAlertView alloc] initWithTitle:@"Warning!!" message:@"Enter the file name" delegate:nil cancelButtonTitle:@"OK" otherButtonTitles:nil];
        [alert show];
    }
    else if(textfield.text!= nil)
    {
        foldername1= [[NSString alloc] initWithString:[NSString stringWithString:textfield.text]];
        NSLog(@"foldername is: %@", foldername1);
    }
    ViewController2 *view2= [[ViewController2 alloc] initWithNibName:@"Next View Name" bundle:nil];
    [self.navigationController pushViewController:view2 animated:YES];
}

Upvotes: 1

Views: 1761

Answers (5)

Steve Wilford
Steve Wilford

Reputation: 9012

Segue-based navigation:

Remove the segue connecting OK button to View Controller 2 and add a manual segue between View Controller 1 and View Controller 2. Then implement the following code:

-(IBAction) okButton: (id) sender
{
    if(textfield.text.length == 0)
    {
        UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Warning!!" 
                                                        message:@"Enter the file name" 
                                                       delegate:nil 
                                              cancelButtonTitle:@"OK" 
                                              otherButtonTitles:nil];
        [alert show];
    }
    else
    {
        foldername1 = textfield.text;
        NSLog(@"foldername is: %@", foldername1);

        [self performSegueWithIdentifier:@"segueIdentifier" sender:self];
    }
}

Code-based navigation:

-(IBAction) okButton: (id) sender
{
    if(textfield.text.length == 0)
    {
        UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Warning!!" 
                                                        message:@"Enter the file name" 
                                                       delegate:nil 
                                              cancelButtonTitle:@"OK" 
                                              otherButtonTitles:nil];
        [alert show];
    }
    else
    {
        foldername1 = textfield.text;
        NSLog(@"foldername is: %@", foldername1);

        ViewController2 *view2 = [[ViewController2 alloc] initWithNibName:@"Next View Name"
                                                                   bundle:nil];
        [self.navigationController pushViewController:view2 animated:YES];
    }
}

This assumes you're using ARC and that foldername1 is a strong ivar / property.

Upvotes: 3

Prasad G
Prasad G

Reputation: 6718

To push view controller:

ViewController2 *vc2 = [[ViewController2 alloc] initWithNibName:@"ViewController2" 
                                                             bundle:nil];
    [self.navigationController pushViewController:vc2 animated:YES];

And also check this.

Upvotes: 0

Muralikrishna
Muralikrishna

Reputation: 1044

try this

(IBAction) okButton: (id) sender
{
if(textfield.text.length==0)
{
    UIAlertView *alert= [[UIAlertView alloc] initWithTitle:@"Warning!!" message:@"Enter the file name" delegate:nil cancelButtonTitle:@"OK" otherButtonTitles:nil];
    [alert show];
}
else if(textfield.text.length!=0)
{
foldername1= [[NSString alloc] initWithString:[NSString stringWithString:textfield.text]];
NSLog(@"foldername is: %@", foldername1);
}
ViewController2 *view2= [[ViewController2 alloc] initWithNibName:@"Next View Name" bundle:nil];
    [self.navigationController pushViewController:view2 animated:YES];
}

Upvotes: 0

D-eptdeveloper
D-eptdeveloper

Reputation: 2430

just writedown

return;

below [alert show]; line then it just shows an alert and not navigate to the nextview.

Upvotes: 0

allprog
allprog

Reputation: 16790

If you assign a segue to a button, then you should not give it a click handler. Simply remove the segue from the button and the code should be Ok since you are using pushViewController:animated: to navigate instead of navigating with a segue.

Normally you would create a segue from view controller 1 to viwe controller 2, name it with an identifier, and activate that in code with the performSegueWithIdentifier:sender: method. Like this:

[self performSegueWithIdentifier:@"selectedIdentifierForTheSegue" sender:self];

For more info this is a pretty good tutorial for implementing navigation: http://www.appcoda.com/storyboards-ios-tutorial-pass-data-between-view-controller-with-segue/

Upvotes: 1

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