Alerts are used to give important informations to user. Only after selecting the option in the alert view, we can proceed further using the app.
- (NSInteger)addButtonWithTitle:(NSString *)title - (NSString *)buttonTitleAtIndex:(NSInteger)buttonIndex - (void)dismissWithClickedButtonIndex: (NSInteger)buttonIndex animated:(BOOL)animated - (id)initWithTitle:(NSString *)title message: (NSString *)message delegate:(id)delegate cancelButtonTitle:(NSString *)cancelButtonTitle otherButtonTitles:(NSString*)otherButtonTitles, ... - (void)show
Update ViewController.h as follows −
Make your class conform to alert view delegate protocol by adding < UIAlertViewDelegate> as shown below in ViewController.h.
#import <UIKit/UIKit.h> @interface ViewController : UIViewController<UIAlertViewDelegate> { } @end
-(void)addAlertView { UIAlertView *alertView = [[UIAlertView alloc]initWithTitle: @"Title" message:@"This is a test alert" delegate:self cancelButtonTitle:@"Cancel" otherButtonTitles:@"Ok", nil]; [alertView show]; }
#pragma mark - Alert view delegate - (void)alertView:(UIAlertView *)alertView clickedButtonAtIndex: (NSInteger)buttonIndex { switch (buttonIndex) { case 0: NSLog(@"Cancel button clicked"); break; case 1: NSLog(@"OK button clicked"); break; default: break; } } }
Update viewDidLoad in ViewController.m as follows −
(void)viewDidLoad { [super viewDidLoad]; [self addAlertView]; }
When we run the application, we'll get the following output −