How to handle Button click event of custom view?

Question

I want to do this below concept in my project:

I just created one small custom popup using UIViewController, this custom popup containing one message label and two button, one is "OK" and another one is "Cancel". This custom popup coding doing in appdelegate. Now when I want to open this popup, I just called this appdelegate popup method in from viewcontroller when I need to open this alert.

Now the problem is, I want to perform different-different functionality on "OK" button of "Custom alert" Popup. So please help to how to I managed this "Ok" Button click event from Individual ViewController.

Answer 1

Put the below method in a Utility class and call it from your view controller like

[Utility showAlertWithTitle:@"ABC" msg:@"msg" vc:self positiveHandler:^(UIAlertAction *action) {
  // Do here when ok is pressed
} negativeHandler:nil]; //pass nil when cancel is pressed

ObjC

+ (void)showAlertWithTitle:(NSString *)title msg:(NSString *)msg vc:(UIViewController *)vc positiveHandler:(void (^ __nullable)(UIAlertAction *action))positiveHandler negativeHandler:(void (^ __nullable)(UIAlertAction *action))negativeHandler {
  UIAlertController *alertController = [UIAlertController alertControllerWithTitle:title message:msg preferredStyle:UIAlertControllerStyleAlert];

  UIAlertAction *positiveAction = [UIAlertAction actionWithTitle:@"Ok" style:UIAlertActionStyleDefault handler:positiveHandler];
  [alertController addAction:positiveAction];

  UIAlertAction *negativeAction = [UIAlertAction actionWithTitle:@"Cancel" style:UIAlertActionStyleDefault handler:negativeHandler];
  [alertController addAction:negativeAction];

  //show alert
  [vc presentViewController:alertController animated:YES completion:nil];
}

Swift

 // Shows alert with yes no button
 static func showAlert(title: String, msg: String, vc: UIViewController, positiveActionHandler: ((UIAlertAction) -> Swift.Void)?, negativeActionHandler: ((UIAlertAction) -> Swift.Void)?) {
 let alertController = UIAlertController(title: title, message: msg, preferredStyle: .alert)
 let positiveAction = UIAlertAction(title: "Ok", style: .destructive, handler: positiveActionHandler)
 alertController.addAction(positiveAction)

 let negativeAction = UIAlertAction(title: "Cancel", style: .cancel, handler: negativeActionHandler)
 alertController.addAction(negativeAction)
 vc.present(alertController, animated: true, completion: nil)
 }