Don't Pop Navigation Controller in Xcode if AlertView

Question

I have a Navigation Controller and when I press the back button I don't want to pop the view but I want to show an UIAlertView.I just want to pop the view after having make a choice on the UIAlertView! How can I do? I tried to catch the event 'back button pressed' but with no results :(

do you want pop up viewcontroller? or display alertview on button action? — Romit M., Sep 18 '12 at 09:47
create a back button with custom method of showing the alert and add to navbar implement pop in the alertviewdelegate — Lithu T.V, Sep 18 '12 at 10:13

score 3 · Accepted Answer · answered Sep 18 '12 at 10:05

Create a UIBarButtonItem inside viewDidload and added it to the navigation bar

UIBarButtonItem *backButton=[[UIBarButtonItem alloc] initWithTitle:@"Back" style:UIBarButtonItemStyleBordered target:self action:@selector(backButtonClicked)];
self.navigationItem.leftBarButtonItem=backButton;

create a method which will be called when the backButton is clicked

-(void)backButtonClicked{
       UIAlertView *alert=[[UIAlertView alloc] initWithTitle:@"Pop View!" message:@"Are you sure?" delegate:self cancelButtonTitle:@"No" otherButtonTitles:@"Yes", nil];
       [alert show];
}

write this UIAlertView delegate method which will be called when the button in the UIAlertView is clicked

-(void)alertView:(UIAlertView *)alertView willDismissWithButtonIndex:(NSInteger)buttonIndex{
      if (buttonIndex==1) {
             [self.navigationController popViewControllerAnimated:YES];
      }
}

NOTE: Dont forget to add UIAlertView delegate in the header file <UIAlertViewDelegate>

Ok I think this is the correct way and It works perfectly! Is it possible to make the UIBarButtonItem looks like the Back Button? — user1679847, Sep 18 '12 at 10:07

score 1 · Answer 2 · edited May 23 '17 at 10:25

1

You can check for back-button press in the viewWillDisappear method like this (got it from here):

-(void)viewWillDisappear:(BOOL)animated {
    if ([self.navigationController.viewControllers indexOfObject:self]==NSNotFound && self.isBackButtonPressed) {
        // back button was pressed.  We know this is true because self is no longer
        // in the navigation stack.
    }
    [super viewWillDisappear:animated];

Hope this helps!

edited May 23 '17 at 10:25

Community

1
1

answered Sep 18 '12 at 09:59

Thermometer

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Would be nice if you mentioned the source with a link to the answer. http://stackoverflow.com/a/3445994/876283 – iNoob Sep 18 '12 at 10:02
You are right, I had this in my own code, and forgot the source. – Thermometer Sep 18 '12 at 13:30

score 0 · Answer 3 · edited May 23 '17 at 12:27

0

Implement pop in UIAlertview delegate method clickedButtonAtIndex: The back button press need to implement only showing the UIAlertview

refer this

edited May 23 '17 at 12:27

Community

1
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answered Sep 18 '12 at 09:48

Lithu T.V

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score 0 · Answer 4 · answered Sep 18 '12 at 09:54

follow this code

in button action.

UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Message" message:@"Do you want to open?" delegate:self cancelButtonTitle:@"NO" otherButtonTitles:@"YES", nil];
[alert show];

//Alert View delegate method
-(void)alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex
{
    if(buttonIndex==0)//NO
    {
        //your code
    }
    else if(buttonIndex==1)//YES
    {
        // your code
    }
}

Don't Pop Navigation Controller in Xcode if AlertView

4 Answers4