Different actions on alert views buttons, depending on the alert view - iphone

Question

I have 3 alert views in my apps.
'wonAlert'
'lostAlert'
'nagAlert'
I implement this to give them actions.
-(void)alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex
This used to work fine, when I had just the 'wonAlert' and 'lostAlert', they had a dismiss and a learn more button that took them to wikipedia,
now I want the nag alert to take them to the app store.
how can I make it so the above method knows which alert view the tap is coming from, or something like that?
Cheers, Sam

Answer 1

It sounds like you've got the UIAlertViews in variables, so I'd use them:
- (void)alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex {
if (alertView == wonAlert) {
//DO STUFF
}
else if (alertView == lostAlert) {
//DO OTHER STUFF
}
else if (alertView == nagAlert) {
//OPEN APP STORE
}
}
More than one view can have the same tag and you can easily mistype the title or change it and forget to update the delegate method.

Answer 2

In your view controller header file, add <UIAlertViewDelegate> so that it agrees to handle UIAlertView delegate methods:
#interface MyViewController : UIViewController <UIAlertViewDelegate> { ... }
In the implementation of your view controller, add the following delegate method:
- (void) alertView:(UIAlertView *)_actionSheet clickedButtonAtIndex:(NSInteger)_buttonIndex {
if ([_actionSheet.title isEqualToString:#"titleOfMyAlertView"]) {
if (_buttonIndex == 0) {
// do stuff for first button
}
else if (_buttonIndex == 1) {
// do something for second button
}
// etc. if needed
}
}
The _actionSheet.title property can be used to distinguish between alert views. My recommendation is to use NSString constants or NSLocalizedString(), if you have a localized strings table, to title your alert views.

Answer 3

I answered a similar question here:
Alert with 2 buttons
the correct way to do this is using the tag property of alerts
upon creating each alert, set its tag variable by adding:
alertName.tag = #; //ex: alertName.tag = 1
Then, in the clickedButtonAtIndex method, you will need to add an 'if' block for each alert you have as shown in the folllowing code:
if(alert.tag == 1)
{
if (buttonIndex == 0)
{
//do stuff
}
else
{
//do other stuff
}
}
if(alert.tag == 2)
///...etc

Answer 4

I would do what Alex suggests, but use the tag property of the AlertView to determine which AlertView had been used.