Handle popViewControllerAnimated like event in another class?

Question

I have to create a same button in every ViewController. So i decided to write a class having this functionality once. I have created a class name MyUtils and added a back button to UINavigationItem and it displays correctly but don't know how to add an event to it in that class.

It displays accurately but no event is perform. I mean popViewControllerAnimated:YES

I call myUtil like

MyUtil *utils = [[MyUtil alloc] init];

[utils NavAndBackBtn:self.navigationItem];

MyUtil.m

-(void)NavAndBackBtn:(UINavigationItem *)nav 
{

 UIButton *btn = [UIButton buttonWithType:UIButtonTypeCustom];

[btn setImage:[UIImage imageNamed:@"icon_back.png"] forState:UIControlStateNormal];

//[btn setTarget:self action:@selector(popView) forControlEventTouchUPInside];

[button setFrame:CGRectMake(0,0,36,20);

UIBarButtonItem *barbtn = [[UIBarButton alloc] initWithCustomView:btn];

nav.leftBarButtonItem = barbtn;// this gives error

}
-(void)popView
{
// [self.navigationController popViewControllerAnimated:YES];  //not working no method in self
}

But don't know how to add an event to popViewControllerAnimated:YES in MyUtil class. because i don't have the reference of self there.

popView method

there must be a way to get the context of the class . i mean self in this class. and add event on its behalf. And there is no method of UINavigationItem which will popViewController.

In Simple Words I simply want to popViewController event on that button which i created in MyUtils . But it must be implemented in MyUtils class. How can i popViewControllerAnimated in another class.

Answer 1

-(void)showBackBarButton:(UIViewController*)controller{
    UIButton *btn = [UIButton buttonWithType:UIButtonTypeCustom];
    [btn setBackgroundColor:[UIColor redColor]];
    [btn setTitle:@"Back" forState:UIControlStateNormal];
    [btn addTarget:controller.navigationController action:@selector(popViewControllerAnimated:) forControlEvents:UIControlEventTouchUpInside];
    [btn setFrame:CGRectMake(0,0,36,30)];
     UIBarButtonItem *barbtn = [[UIBarButtonItem alloc] initWithCustomView:btn];
    controller.navigationItem.leftBarButtonItem=barbtn;
}

On ViewDiDLoad

    [utils showBackBarButton:self];