Question

I’m making a “Tapping-App” where you have to kill zombies by tapping on them. Currently i can’t make any progress because i can’t use the methods i need properly.

My App works like that:

I have a timer that spawns an image 3 times per second:

[NSTimer scheduledTimerWithTimeInterval:1.0/3 
                                 target:self 
                               selector:@selector(Spawn) 
                               userInfo:nil 
                                repeats:YES];

then i have the Spawn command:

- (void) Spawn {
    CGRect myImageRect = CGRectMake(0.0f, 0.0f, 320.0f, 109.0f);
    UIImageView *myImage = [[UIImageView alloc] initWithFrame:myImageRect];
    [myImage setImage:[UIImage imageNamed:@"myImage.png"]];
    myImage.opaque = YES;
    [self.view addSubview:myImage];
    [myImage release]
}

I also have a “TouchesBegan” command:

- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event {
    UITouch *touch = [[event allTouches] anyObject];
    CGPoint touchLocation = [touch locationInView:self.view];   
}

What I want to do, is put all the spawning images into an Array; If one of the images is touched i want it to be removed from the superview.I want to know how an array works and how i can remove objects added to the array from a different function like “TouchesBegan”.

Please help me with my problem!

EDIT:

Nevermind… I searched around the internet and found some useful resources witch were almost what i needed. I finally figured out how it works and got my spawner function to work with collision and with “TouchesBegan”.

If somebody wants the code, just ask me.

DD

Answer 1

Use [NSMUtableArray addObject:] and [NSMutableArray removeObject:]

In your interface, something like:

@interface MyClass
{
    NSMutableArray *zombies_;
}

In your implementation, after initializing the array, change your spawn method to include the line

[self.zombies addObject:myImage];

and in your touch handler, after you determine which view was touched, something like

[zombies_ removeObject:theView];
[theView removeFromSuperview];

Although, after thinking about it, you may be better off just creating UIButton instances instead of UIIMageViews and writing touch handlers to determine which view was touched.