Question

我刚刚开始在iPhone中开发，我已经设法让我的按钮（其中六个）与UIAccelerator一起移动。当他们相互碰撞时我遇到的问题。我希望它们向同一方向反弹，如果我只使用2个按钮，这就有效。但是当有多个碰撞超过2个按钮时，它们会重叠并最终合并到一起。

这是我设置委托的代码：

UIAccelerometer *accel = [UIAccelerometer sharedAccelerometer];
accel.delegate = self;
accel.updateInterval = 1.0f/60.0f;

加速器的委托方法：

- (void)accelerometer:(UIAccelerometer *)accelerometer didAccelerate:(UIAcceleration *)acceleration{
delta.x = acceleration.x * 5;
delta.y = acceleration.y * -5;

self.firstButton.center = CGPointMake(self.firstButton.center.x + delta.x, self.firstButton.center.y + delta.y);
self.secondButton.center = CGPointMake(self.secondButton.center.x + delta.x, self.secondButton.center.y + delta.y);
self.thirdButton.center = CGPointMake(self.thirdButton.center.x + delta.x, self.thirdButton.center.y + delta.y);
self.fourthButton.center = CGPointMake(self.fourthButton.center.x + delta.x, self.fourthButton.center.y + delta.y);
self.fifthButton.center = CGPointMake(self.fifthButton.center.x + delta.x, self.fifthButton.center.y + delta.y);
self.sixthButton.center = CGPointMake(self.sixthButton.center.x + delta.x, self.sixthButton.center.y + delta.y);

[self updateMovingObjects:self.firstButton];
[self updateMovingObjects:self.secondButton];
[self updateMovingObjects:self.thirdButton];
[self updateMovingObjects:self.fourthButton];
[self updateMovingObjects:self.fifthButton];
[self updateMovingObjects:self.sixthButton];
}

updateMovingObjects：

- (void)updateMovingObjects:(UIButton *)button{
/*** DETECT COLLISIONS ***/

// Right screen
if(button.center.x < button.frame.size.width / 2){
    button.center = CGPointMake(button.frame.size.width / 2, button.center.y); 
}
// Left screen
if(button.center.x > 320 - button.frame.size.width / 2){
    button.center = CGPointMake(320 - button.frame.size.width / 2, button.center.y); 
}
// Top screen
if(button.center.y < button.frame.size.height / 2){
    button.center = CGPointMake(button.center.x, button.frame.size.height / 2); 
}
// Bottom screen
if(button.center.y > 480 - 20 - 43 - button.frame.size.height / 2){
    button.center = CGPointMake(button.center.x, 480 - 20 - 43 - button.frame.size.height / 2); 
}

// Detect collision with objects
for (UIView *anotherView in [self.view subviews]) {
    if (button == anotherView){
        continue;
    }
    if(CGRectIntersectsRect(button.frame, anotherView.frame)){
        float_t vec = sqrtf(powf(delta.x, 2.0)+powf(delta.y, 2.0));
        // collided from left or bottom
        if( (button.center.x + button.frame.size.width / 2 >= anotherView.center.x - anotherView.frame.size.width / 2 &&
             button.center.x + button.frame.size.width / 2 <= anotherView.center.x - anotherView.frame.size.width / 2 + 15)
           ||  (button.center.y - button.frame.size.height / 2 <= anotherView.center.y + anotherView.frame.size.height / 2 &&
                button.center.y - button.frame.size.height / 2 >= anotherView.center.y + anotherView.frame.size.height / 2 - 15) ){
               button.center = CGPointMake(button.center.x - vec, button.center.y + vec);
           }
        // collided from top or right
        else{
            button.center = CGPointMake(button.center.x + vec, button.center.y - vec);
        }
    }
}

/*** END DETECT COLLISIONS ***/
}

提前致谢。

编辑：我为检测它是从左，右，底还是顶部碰撞的功能做了。现在效果要好得多，但问题仍然是重叠，如果我把它们全部一次移动，我的猜测是它没有时间计算，从而得到重叠：

- (BOOL)collidedFromLeft:(UIButton *)button{
for (UIView *anotherView in [self.view subviews]) {
    if (button == anotherView){
        continue;
    }
    if(CGRectIntersectsRect(button.frame, anotherView.frame)){
        if(button.center.x + button.frame.size.width / 2 - delta.x < anotherView.center.x - anotherView.frame.size.width / 2 &&
           button.center.x + button.frame.size.width / 2 >= anotherView.center.x - anotherView.frame.size.width / 2){
            return YES;
        }
    }
}
return NO;

}

- (BOOL)collidedFromTop:(UIButton *)button{
for (UIView *anotherView in [self.view subviews]) {
    if (button == anotherView){
        continue;
    }
    if(CGRectIntersectsRect(button.frame, anotherView.frame)){
        if(button.center.y + button.frame.size.height / 2 - delta.y < anotherView.center.y - anotherView.frame.size.height / 2 &&
           button.center.y + button.frame.size.height / 2 >= anotherView.center.y - anotherView.frame.size.height / 2){
            return YES;
        }
    }
}
return NO;

}

- (BOOL)collidedFromRight:(UIButton *)button{
for (UIView *anotherView in [self.view subviews]) {
    if (button == anotherView){
        continue;
    }
    if(CGRectIntersectsRect(button.frame, anotherView.frame)){
        if(button.center.x - button.frame.size.width / 2 - delta.x > anotherView.center.x + anotherView.frame.size.width / 2 &&
           button.center.x - button.frame.size.width / 2 <= anotherView.center.x + anotherView.frame.size.width / 2){
            return YES;
        }
    }
}
return NO;

}

- (BOOL)collidedFromBottom:(UIButton *)button{
for (UIView *anotherView in [self.view subviews]) {
    if (button == anotherView){
        continue;
    }
    if(CGRectIntersectsRect(button.frame, anotherView.frame)){
        if(button.center.y - button.frame.size.height / 2 - delta.y > anotherView.center.y + anotherView.frame.size.height / 2 &&
           button.center.x - button.frame.size.width / 2 <= anotherView.center.y + anotherView.frame.size.height / 2){
            return YES;
        }
    }
}
return NO;

}

然后我在他们搬家时检查：

if([self collidedFromLeft:button]){
    button.center = CGPointMake(button.center.x - 20, button.center.y);
}
if([self collidedFromRight:button]){
    button.center = CGPointMake(button.center.x + 20, button.center.y);
}
if([self collidedFromTop:button]){
    button.center = CGPointMake(button.center.x, button.center.y - 20);
}
if([self collidedFromBottom:button]){
    button.center = CGPointMake(button.center.x, button.center.y + 20);
}

iPhone - 检测多个按钮的碰撞

0 个答案: