How to fire uibarbuttonitem click event programmatically

Question

I have created a UIActionSheet

UIActionSheet * action = [[UIActionSheet alloc]initWithTitle:@""
                                                              delegate:self
                                                     cancelButtonTitle: @"cancel"
                                                destructiveButtonTitle: @"OK"
                                                     otherButtonTitles: nil];
          [action showInView:self.view];
          [action release];

On the event of the cancel button in the UIActionSheet I want to fire the event of a UIBarButtonItem, which is in my view.

My question is how can I fire the button event(without touching the button) in the UIActionSheet delegate method

Solution 1

Not knowing the current bar button item action you can invoke it this way:

[barButtonItem.target performSelector:barButtonItem.action]

This will however bring "unknown selector" compiler warning, but this may be worked around.

Solution 2

Another way to do that and avoiding warnings is as follows:

[[UIApplication sharedApplication] sendAction:barButtonItem.action
                                           to:barButtonItem.target
                                         from:nil
                                     forEvent:nil];

Solution 3

@ton1n8o 's solution worked for me. Here is the implementation in swift:

UIApplication.sharedApplication().sendAction(barButtonItem.action, to: barButtonItem.target, from: nil, forEvent: nil)

Solution 4

I've read the accepted answer and it is awfully DANGEROUS. you should never suppress such warnings in order to shortcut the path to your desired result!

the safest way to do so:

SEL selector=barButton.action;
id target=barButton.target;
  if(selector && target){
     IMP imp = [target methodForSelector:selector];
     void (*func)(id, SEL) = (void *)imp;
     func(target, selector);
  }

Please read the original post here: performSelector may cause a leak because its selector is unknown

Solution 5

For my case with RxCocoa I needed to provide a nil - object to the perform action otherwise it would crash with EXC_BAD_ACCESS:

let button = sut.navigationItem.leftBarButtonItem!
_ = button.target?.perform(button.action, with: nil)

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Comments

[Jean Paul]

UIBarButtonItem may not respond to sendActionsForControlEvents

[NSExpression]

This was really helpful to me. Thanks @Krrish

[anders]

does anyone else get ARC warning here "may cause leak"?

[Pang]

To suppress the "may cause leak" warning, see this answer.

[ayoy]

Nope, it is absolutely valid case. You are allowed to use performSelector: as well as barButtonItem.action, no private API usage here.

[Mutawe]

Thanks for the from nil, because most actions has sender

[nickromano]

Swift version: _ = editButton.target?.perform(editButton.action)