Question

Still learning about Objective C and getting the structure right.

I have an iOS App with a UIViewController that has a defined method named “doSomething”. In my view controller I have a view and in that view a number of UIButton that I create programmatically (see example below with one button).

Now when I press the button I want to call my method “doSomething”. The way I currently do it is like this:

[myButton addTarget:nil 
             action:@selector(doSomething:)
     forControlEvents:UIControlEventTouchUpInside];

Since my target is nil it goes up the responder chain until it finds a method called “doSomething”. It works, but it does not really feel right.

I have started to look into using @protocol but not really got my head around it. I have been looking at some tutorials but for me it is not clear enough. I have used protocols like for the table view controllers, but defining one is new for me.

Would it be possible to get an example for this specific case?

Thanks!

Answer 1

As your target pass in the view controller and the method will be called on that object.

Edit:

[myButton addTarget:controller 
             action:@selector(doSomething:)
     forControlEvents:UIControlEventTouchUpInside];

Assuming that you have a variable called controller that is your UIViewController. If you don’t have a reference to your controller then simply pass one to your view.

Edit2:

View interface:

@property (assign) UIViewController* controller;

View implementation:

@synthesize controller;

Controller:

- (void) viewDidLoad {
    [super viewDidLoad];
    someView.controller = self;
}