Ios 让精灵只跳一次

使用Xcode、Spritebuilder和Cocos2d，我试图让玩家只跳一次sprite。因此，当玩家轻触屏幕时，精灵会跳跃，只有当它落地时，玩家才能再次跳跃。到目前为止，我还没有找到任何明确的解释，因此我提出了这个问题

这是我的密码

编辑以使代码仅允许精灵跳跃一次：

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你可以用枪。以下是我的触屏跳转代码：

BOOL isInAir;//Make this global.
-(void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event {
    /* Called when a touch begins */
    UITouch *touch = [touches anyObject];
    SKSpriteNode *node = [self nodesAtPoint:[touch locationInNode:self]];

                if (isInAir == NO)
                {
                    CGFloat impulseX = 0.0f;
                    CGFloat impulseY = 600.0f;
                    [node.physicsBody applyImpulse:CGVectorMake(impulseX, impulseY) atPoint:node.position];
                    isInAir = YES;
                    //other stuff
                }
}

然后，当您接触地面时，将isInAir设置为NO

BOOL isInAir;//Make this global.
-(void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event {
    /* Called when a touch begins */
    UITouch *touch = [touches anyObject];
    SKSpriteNode *node = [self nodesAtPoint:[touch locationInNode:self]];

                if (isInAir == NO)
                {
                    CGFloat impulseX = 0.0f;
                    CGFloat impulseY = 600.0f;
                    [node.physicsBody applyImpulse:CGVectorMake(impulseX, impulseY) atPoint:node.position];
                    isInAir = YES;
                    //other stuff
                }
}