Make UIAlertView Button trigger function On Press

NOTE:

Important: UIAlertView is deprecated in iOS 8. (Note that UIAlertViewDelegate is also deprecated.) To create and manage alerts in iOS 8 and later, instead use UIAlertController with a preferredStyle of UIAlertControllerStyleAlert.

Please check this out tutorial

"deprecated" means???

Objectvie C

.h file

    @interface urViewController : UIViewController <UIAlertViewDelegate> {

.m file

// Create Alert and set the delegate to listen eventsUIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Today's Entry Complete"                                                message:@"Press OK to submit your data!"                                               delegate:self                                      cancelButtonTitle:nil                                      otherButtonTitles:@"OK", nil];// Set the tag to alert unique among the other alerts.// So that you can find out later, which alert we are handlingalert.tag = 100;[alert show];//[alert release];-(void) alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex{    // Is this my Alert View?    if (alertView.tag == 100) {        //Yes    // You need to compare 'buttonIndex' & 0 to other value(1,2,3) if u have more buttons.    // Then u can check which button was pressed.        if (buttonIndex == 0) {// 1st Other Button            [self submitData];        }        else if (buttonIndex == 1) {// 2nd Other Button        }    }    else {     //No        // Other Alert View    }}

Swift

The Swifty way is to use the new UIAlertController and closures:

    // Create the alert controller    let alertController = UIAlertController(title: "Title", message: "Message", preferredStyle: .Alert)    // Create the actions    let okAction = UIAlertAction(title: "OK", style: UIAlertActionStyle.Default) {        UIAlertAction in        NSLog("OK Pressed")    }    let cancelAction = UIAlertAction(title: "Cancel", style: UIAlertActionStyle.Cancel) {        UIAlertAction in        NSLog("Cancel Pressed")    }    // Add the actions    alertController.addAction(okAction)    alertController.addAction(cancelAction)    // Present the controller    self.presentViewController(alertController, animated: true, completion: nil)

If you are using multiple UIAlertView instances that are not declared in the class's interface you can also set a tag to identify instances in your delegate method, for example:

somewhere on top of your class file myClass.m

#define myAlertViewsTag 0

creating the UIAlertView:

UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"My Alert"    message:@"please press ok or cancel"    delegate:self    cancelButtonTitle:@"Cancel"    otherButtonTitles:@"OK", nil];alert.tag = myAlertViewsTag;[alert show];[alert release];

the delegate method:

-(void)alertView:(UIAlertView *)alertView didDismissWithButtonIndex:(NSInteger)buttonIndex {    if (alertView.tag == myAlertViewsTag) {        if (buttonIndex == 0) {            // Do something when cancel pressed        } else {            // Do something for ok        }    } else {        // Do something with responses from other alertViews    }}

You need to set the delegate when allocating the alertview, then use one of the UIAlertViewDelegate methods to call your own method, for example:

UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Today's Entry Complete"                                                message:@"Press OK to submit your data!"                                               delegate:self                                      cancelButtonTitle:@"OK"                                      otherButtonTitles:nil];[alert show];[alert release];- (void)alertView:(UIAlertView *)alertView didDismissWithButtonIndex:(NSInteger)buttonIndex{    [self submitData];}