Passing arguments to @selector method

问题

I have added a UIButton in a table view. Now when I click a particular button, I need to get the details of the object corresponding to that row.

[button addTarget:self 
           action:@selector(invite:contactmail:) 
 forControlEvents:UIControlEventTouchUpInside];

I have used this method for the button; how can I pass arguments to this selector method? Or is there any other way to pass arguments to this method when this button is clicked?

回答1:

methods you add as actions to a UIControl can have 3 different signatures

- (void)action
- (void)action:(id)sender
- (void)action:(id)sender event:(UIEvent *)event

you can't pass your own object. Often it is possible to get whatever object you are trying to pass with the help of the sender (your button) object.

If you have a button in a tableviewcell you could use something like this to get the indexpath of the cell.

- (IBAction)buttonAction:(id)sender {
    UIButton *button = (UIButton *)sender;
    CGPoint buttonOriginInTableView = [button convertPoint:CGPointZero toView:tableView];
    NSIndexPath *indexPath = [tableView indexPathForRowAtPoint:buttonOriginInTableView];

    // do something
}

and with the indexPath you can get the object you need.

回答2:

No not really. The click event is

-(IBAction) fnc:(id)sender;

If you want to call another method you will need to do so in a function of that form.

-(IBAction) fnc:(id) sender
{
   UIButton *b = (UIButton*) sender;
   [self otherFnc:b arg:arg1 arg2:arg2];
}

来源：https://stackoverflow.com/questions/5246768/passing-arguments-to-selector-method

标签

ios

objective-c

cocoa-touch

uibutton

selector