CODEWITHSUNDEEP
objective-cinheritanceuibuttonprotocols
Structurer
Structurer

Reputation: 694

Calling a method in a UIViewController from a UIButton in a subview

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).

enter image description here

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!

Upvotes: 5

Views: 2710

Answers (2)

skorulis
skorulis

Reputation: 4381

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;
}

Upvotes: 4

csano
csano

Reputation: 13686

The way I'd do it is set the value of addTarget to self.

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

This will look for the method doSomething on the object that the target is added in. In this case, this would be the view controller.

Upvotes: 0

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