Detecting button click with UIAlertView

Question

I am trying to call and alert when a button is pressed. i use this :

-(IBAction)Add { 
    UIAlertView *alert = [[UIAlertView alloc] initWithTitle: @\"add bu         


        

Answer 1

I feel if you wish to show a new alert view on button click event of an existing alert view, it would be better to use

- (void) alertView:(UIAlertView *)alertView didDismissWithButtonIndex:(NSInteger)buttonIndex
{

}

delegate method instead of

- (void)alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex
{

}

Answer 2

This is your code which i used and added some my code also. **

-(IBAction) Add 
{

          UIAlertView *alert = [[UIAlertView alloc]initWithTitle:@"add button pressed"

                                                       message:@"Add to record"
                                                      delegate:nil     
                                             cancelButtonTitle:@"Cancel" 
                                             otherButtonTitles:@"OK", nil];

       alert.tag=101;//add tag to alert
       [alert show];
       [alert release];     
}

Now when you press button on alert it will call clickedButtonAtIndex but there should a identifier for every alert. So add tag and then

- (void)alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex** 

{

//  the user clicked one of the OK/Cancel buttons
if(alertView.tag == 101)     // check alert by tag 
{    

if (buttonIndex == 0)

   {

    //just to show its working, i call another alert view

    UIAlertView *alert = [[UIAlertView alloc] initWithTitle: @"OK WORKIng well"

                                                    message:@"no error"
                                                   delegate:nil
                                          cancelButtonTitle:@"IWORKS" 
                                          otherButtonTitles:@"NO PRB", nil];

    [alert show];
    [alert release];    

}

else

{
    NSLog(@"cancel");       
}
}
}

Hope it helps.

Answer 3

1)
.h file 
@interface MyClassViewController:<UIAlertViewDelegate> 

2)
.m file

UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Note"
                                                message:@"some message"
                                               delegate:self    // must be self to call clickedButtonAtIndex
                                      cancelButtonTitle:@"Cancel"
                                      otherButtonTitles:@"OK", nil];


3)
- (void)alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex {

  if (buttonIndex == [alertView cancelButtonIndex]) {
    NSLog(@"The cancel button was clicked from alertView");
  }
 else {

}
}

Answer 4

If you prefer your code to be cleaner and no dependency on delegate, you should try the blocks implementation of UIAlertView:

https://github.com/steipete/PSAlertView

Blocks are only supported on iOS 4+ devices though.

Answer 5

To detect the button clicks the alert view must have an associated delegate, e.g.

UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"add button pressed"
                                                message:@"Add to record"
                                               delegate:self    // <------
                                      cancelButtonTitle:@"Cancel"
                                      otherButtonTitles:@"OK", nil];

Answer 6

The buttonIndex of 0 is the cancel button. I would recommend using:

- (void)alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex {
if (buttonIndex == 0)
{
      NSLog(@"cancel");   
}
else
{
   UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"OK works" message:@"no error" delegate:nil cancelButtonTitle:@"OK" otherButtonTitles:nil];                                                                                                              
    [alert show];
    [alert release];        
}
}