Question

I created a sub-class of UIViewController called toolbarViewController , I declare a UIButton in this view controller and specified it’s target as following

UIButton *button = [[UIButton alloc]initWithFrame:myFrame];
[button addTarget:self action:@selector(doSomething) forContorlEvents:UIControlEventTouchUpInside];

then i do the following in a different view controller

toolbarViewController *toolbar = [[toolbarViewController alloc]init];
[self.view addSubview:toolbar.view];

the problem is that when i press the button i get the exception: Unrecognized selector ( doSomething ) send to instance , what am i doing wrong here ?

doSomething declaration in toolbarViewController.h

-(void)doSomething;

and in toolbarViewController.m

-(void)doSomething{ NSLog("doSomething got called"); }

Answer 1

Check the declaration of doSomething. If you declare IBAction something like -(IBAction)doSomething:(id)sender, you should add selector like

[button addTarget:self action:@selector(doSomething:) forContorlEvents:UIControlEventTouchUpInside];

instead of

[button addTarget:self action:@selector(doSomething) forContorlEvents:UIControlEventTouchUpInside];