Question

我目前正在为iOS创建一款非常基本的游戏。基本上，我在屏幕上设置了正方形动画，以及使用加速度计控制的“船”。我想检测船何时撞到正在移动的方格，并且由于某种原因我的代码无效。

在这个块中，我创建了一个正方形的动画：

    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"];

然后我创造我的船，并设置加速度计等。我遇到的问题是，当我运行这种方法，船和方碰撞时，没有任何反应！这是我的碰撞方法代码：

- (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];

}  
}

我在init方法中调用[self collisionWithSquares]：

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;
}

Answer 1

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

Answer 2

使用“square.frame”，“square2.frame”等，而不是为碰撞检测创建CALayer。另外，只用一个条件测试你的if语句，看它是否会触发。

检测两个图像是否在Objective-C和打印消息中发生碰撞

2 个答案: