Question

在我的项目中，我希望使用_character方法移动applyForce:，我希望在我的手指有_character帮助的情况下，将力量持续应用于button但我也不希望velocity超过一定数量。

我尝试过以下方法：

-(void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event{

    UITouch *touch = [touches anyObject];
    CGPoint location = [touch locationInNode:self];
    SKNode *node = [self nodeAtPoint:location];


        if ([node.name isEqualToString:@"moveRightButton"]){

            _held = YES;

            for (SKPhysicsContact* contact in [self.contactQueue copy]){

                [self handleContact:contact];
                [self.contactQueue removeObject:contact];

            }
            while (_held == YES) {
                [_character.physicsBody applyForce:CGVectorMake(1000, 0)];
            }
       }
    }

-(void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event{

    UITouch *touch = [touches anyObject];
    CGPoint location = [touch locationInNode:self];
    SKNode *node = [self nodeAtPoint:location];

        if ([node.name isEqualToString:@"moveRightButton"]){

            _held = NO;

        }

}

_held是全班可以使用的ivar。

现在，当我运行此操作时，我遇到了某种类型的内存泄漏，导致它使用GB的内存，大约3分钟内达到7 GB（可能是因为我使用CGVectoryMake:而不是设置CGVector每次都没有创建的变量）当我点击按钮时不再发生任何事情，但是当我没有使用while语句时它工作得很好但我不得不连续按下它来到达某个地方。

Answer 1

回答如何限制物体速度的问题：

if(mySpriteA.physicsBody.velocity.dx > 50)
    mySpriteA.physicsBody.velocity = CGVectorMake(50, mySpriteA.physicsBody.velocity.dy);
if(mySpriteA.physicsBody.velocity.dx < -50)
    mySpriteA.physicsBody.velocity = CGVectorMake(-50, mySpriteA.physicsBody.velocity.dy);
if(mySpriteA.physicsBody.velocity.dy > 50)
    mySpriteA.physicsBody.velocity = CGVectorMake(mySpriteA.physicsBody.velocity.dx, 50);
if(mySpriteA.physicsBody.velocity.dy < -50)
    mySpriteA.physicsBody.velocity = CGVectorMake(mySpriteA.physicsBody.velocity.dx, -50);

当手指在节点上时如何对精灵施加恒定力并在释放时取消力

1 个答案: