Copernikush
Copernikush

Reputation: 129

Detecting if two images collide in objective-C and print message

I am currently creating a very basic game for iOS. Basically, I have squares animating across the screen, and a "ship" that is controlled using the accelerometer. I want to detect when the ship hits the squares that are moving, and for some reason my code is not working.

In this block I am creating the animation of a square:

    square4 = [[UIImageView alloc] initWithFrame: CGRectMake(frameWidth/10, frameHeight/1.35, frameWidth*.1, frameWidth*.1)];
    square4.image = [UIImage imageNamed: @"square.png"];
    [self.view addSubview: square4];
    CGPoint origin4 = square4.center;
    CGPoint target4 = CGPointMake(square4.center.x+300, square3.center.y);
    CABasicAnimation *bounce4 = [CABasicAnimation animationWithKeyPath:@"position.x"];
    bounce4.fromValue = [NSNumber numberWithInt:origin4.x];
    bounce4.toValue = [NSNumber numberWithInt:target4.x];
    bounce4.duration = 2.3;
    bounce4.repeatCount = HUGE_VALF;
    bounce4.autoreverses = YES;
    [square4.layer addAnimation:bounce4 forKey:@"position"];

Then I create my ship, and set up the accelerometer, etc. The problem I am having is that when I run this method, and the ship and square collide, nothing happens! Here's my collision method code:

- (void)collisionWithSquares {

CALayer *squareLayer1 = [square.layer presentationLayer];
CALayer *squareLayer2 = [square2.layer presentationLayer];
CALayer *squareLayer3 = [square3.layer presentationLayer];
CALayer *squareLayer4 = [square4.layer presentationLayer];

if (CGRectIntersectsRect(ship.frame, squareLayer1.frame)
    || CGRectIntersectsRect(ship.frame, squareLayer2.frame)
    || CGRectIntersectsRect(ship.frame, squareLayer3.frame)
    || CGRectIntersectsRect(ship.frame, squareLayer4.frame) ) {

    //self.currentPoint  = CGPointMake(0, 144);

    UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Oops!"
                                                    message:@"Mission Failed!"
                                                   delegate:self
                                          cancelButtonTitle:@"OK"
                                          otherButtonTitles:nil];
    [alert show];

}  
}

I am calling [self collisionWithSquares] here in my init method:

self.motionManager = [[CMMotionManager alloc] init];
    self.motionManager.accelerometerUpdateInterval = .05;
    //accelerometer queues up the data
    //handler calls outputaccelera
    [self.motionManager startAccelerometerUpdatesToQueue:[NSOperationQueue currentQueue] withHandler:^(CMAccelerometerData  *accelerometerData, NSError *error)
     {
         [self outputAccelerationData:accelerometerData.acceleration];
     }];


    [self.view addSubview: ship];
    [self collisionWithSquares];

}
return self;
}

Upvotes: 0

Views: 1025

Answers (2)

Pradeep Mittal
Pradeep Mittal

Reputation: 593

if (CGRectIntersectsRect(imageView1.frame, imageView2.frame)) {
// Do whatever it is you need to do.
}

Upvotes: 2

DoS
DoS

Reputation: 1474

use the "square.frame", "square2.frame", etc. rather then creating a CALayer for the collision detection. also, test your if statement with only one condition and see if it fires.

Upvotes: 1

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