如何在同一个委托类中调用Delegate方法作为选择器

Question

I have my custom delegate class for UINavigationController .

Currently i am facing issue in my UIBarButtonItems .

i have to define @Selector for each BarItem.

So Far i define selector for each bar item like this:

SEL selector = (menu == MyMenu) ? @selector(leftSelected:) : @selector(rightSelected:);

the are working perfect because they are local method in my delegate class so there is no problem.

but one point i need to declare my delegate method as @Selector because its define in other viewcontroller.

here i have to define my delegate method as selector.

SEL selector = (menu == MenuLeft) ? @selector(leftMenuSelected:) : @selector(righttMenuSelected:);

    if (menu == MenuTwo) {
        selector = @selector(arrowMenuSelectedOut);
    }

    if ( menu == MenuTwo ){



        UIImage *image = [UIImage imageNamed:MENU_ARROW];


     UIBarButtonItem *btn=    [[UIBarButtonItem alloc] initWithImage:image style:UIBarButtonItemStyleDone target:self action:selector];
          btn.imageInsets = UIEdgeInsetsMake(0, 0, 0, -25.0);

        return btn;

    }
    else
    {
        UIImage *image = [UIImage imageNamed:MENU_IMAGE];


        return [[UIBarButtonItem alloc] initWithImage:image style:UIBarButtonItemStylePlain target:self action:selector];
    }

this is my delegate method.

@protocol myNavigationViewControllerDeleget<NSObject>
- (void)arrowMenuSelectedOut;
@end

which is placed in other viewcontroller.

  - (void)arrowMenuSelectedOut
    {

        NSLog(@"button press");

    }

i want to use this arrowMenuSelectedOut method as selector from same delegate class on button press.

Answer 1

if you like to call delegate try it like this.

[self.mydelegate arrowMenuSelectedOut];

or in you case

UIBarButtonItem *btn = [[UIBarButtonItem alloc] initWithImage:image style:UIBarButtonItemStyleDone target:self.mydelegate action:@selector(arrowMenuSelectedOut)];

also check did you define you delegate properly it should not be nil. try this

self.mydelegate=self;

Answer 2

Based on the errors you put in the comments (they should be in the question), the problem is you are passing the wrong target when creating the button.

Change:

UIBarButtonItem *btn = [[UIBarButtonItem alloc] initWithImage:image style:UIBarButtonItemStyleDone target:self action:selector];

to:

UIBarButtonItem *btn = [[UIBarButtonItem alloc] initWithImage:image style:UIBarButtonItemStyleDone target:self.mydelegate action:selector];

The only thing that is changed is the target parameter value.