iPhone Tap Counter

Question

I'm trying to get a UI Button to interact with a UI Label through Xcode and Interface Builder. What should I change in this code to do so? (I have everything linked up in Interface Builder already. The app just crashes when I press the button.)

@synthesize window;
@synthesize label;
@synthesize anotherLabel;
@synthesize myButton;


    #pragma mark -
    #pragma mark Application lifecycle



    - (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {    

     [myButton setTitle:@"Press Here" forState:UIControlStateNormal];

     window.backgroundColor = [UIColor grayColor];

     label.text = [[NSDate date] description];


        // Override point for customization after application launch.

     [myButton addTarget:anotherLabel action:@selector(doButton:) forControlEvents:UIControlEventTouchUpInside];

        [window makeKeyAndVisible];

     return YES;
    }

     -(void) doButton:(UILabel *)anotherLabel{
     static int count;
        count++;

            }

Answer 1

Ok, first off, your not updating the label this way, since just passing anotherLabel as a parameter and that will not mean that it will change the properties of it. Also, you are not passing the correct parameter for doButton:. In this case I would just forget a parameter and up date the anotherLabel by saying:

static int count;
count++;
NSString *countString = [NSString stringWithFormat:@"%d", count];
[anotherLabel setText: countString];