Objective C: Sending arguments to a method called by a UIButton

Question

I have a method that is being called when a UIButton is clicked. When I create the button I want it to store an NSTimer as an argument.

This is the timer and the cr

Answer 1

You need to make the timer a property of your view controller and then referenced it from your tapFig: method. Here is what your code might look like:

MainViewController.h

//
//  MainViewController.h
//  TapFigSample
//
//  Created by Moshe Berman on 1/30/11.
//  Copyright 2011 MosheBerman.com. All rights reserved.
//

@interface MainViewController : UIViewController  {
    NSTimer *timer; 
    UIButton *stickFig;
}

@property (nonatomic, retain) NSTimer *timer;
@property (nonatomic, retain) UIButton *stickFig;

- (void)tapFig:(id)sender;

- (void) moveStickFig;

- (void) moveStickFig:(id)yourArgument


@end

MainViewController.m

//
//  MainViewController.m
//  TapFigSample
//
//  Created by Moshe Berman on 1/30/11.
//  Copyright 2011 MosheBerman.com. All rights reserved.
//

#import "MainViewController.h"


@implementation MainViewController

@synthesize timer, stickFig;

- (void) viewDidLoad{

    [self  setTimer:[NSTimer scheduledTimerWithTimeInterval:(0.009) target:self selector:@selector(moveStickFig:) userInfo:stickFig repeats:YES]];
    [stickFig addTarget:self action:@selector(tapFig:) forControlEvents:UIControlEventTouchUpInside];

}

- (void)tapFig:(id)sender{
    //do something with self.timer

}

- (void) moveStickFig:(id)yourArgument{
    //Move the stick figure
    //A tophat and a cane might 
    //look nice on your stick figure
    // :-)
}

- (void)dealloc {
    [stickFig release];
    [timer release];
    [super dealloc];
}


@end

Notice the @property declaration in the header file. I'd consider taking another look at the timer initialization too, but that could just be me. I hope this helps!