Question

My code:

-(void)loadView {
[super loadView];
self.informationButton = [[UIBarButtonItem alloc] initWithCustomView:[UIButton buttonWithType:UIButtonTypeInfoLight]];
}

- (void)viewDidLoad
{
[super viewDidLoad];
self.navigationItem.leftBarButtonItem = self.informationButton;
self.informationButton.target = self;
self.informationButton.action = @selector(showHelpInfo);
}

-(void)showHelpInfo {
UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Test" 
                                                message:@"Test" 
                                               delegate:nil 
                                      cancelButtonTitle:@"cansel" 
                                      otherButtonTitles:nil, nil];
[alert show];
}

Then I clicking on my informationButton uialertview not shows. There is my error?

Answer 1

Your UIButton is the thing that now dispatches actions and events because the UIBarButtonItem is merely a container for it at this point. So, when you click that button, it’s the UIButton that’s intercepting the touch event. Simply make a UIButton object that has the same action your UIBarButtonItem.

- (void)viewDidLoad
{
    [super viewDidLoad];
    UIButton *iButton = [UIButton buttonWithType:UIButtonTypeInfoLight];
    [iButton addTarget:self action:@selector(showHelpInfo) forControlEvents:UIControlEventTouchUpInside];
    self.informationButton = [[UIBarButtonItem alloc] initWithCustomView:iButton];
    self.navigationItem.leftBarButtonItem = self.informationButton;
}