ios - 覆盖 Spritekit 中的触摸

Question

在我正在开发的游戏中，您可以通过触摸屏幕的左侧/右侧将角色从左向右移动。我想要做的是，如果您先触摸左侧然后触摸右侧，角色就会开始向右移动而不是向左移动；向左移动的 Action 被覆盖。我目前已经做到了，所以游戏是单点触摸的，但是覆盖以前触摸的方法是我坚持的地方。我的代码:

- (void) touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event{
    UITouch *touch = [touches anyObject];
    CGPoint location = [touch locationInNode:self];


    if (location.x < screenWidth/2){
        leftMovement = YES;
        [player runLeft];
    }
    else {
        rightMovement = YES;
        [player runRight];
    }

    self.userInteractionEnabled = NO;

}
- (void) touchesEnded:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event{
    [self playerStop];
    self.userInteractionEnabled = YES;
}

- (void) update:(NSTimeInterval)currentTime {
    if (isTouched && leftMovement){
        player.physicsBody.velocity=CGVectorMake(-PLAYERSPEED,
                                player.physicsBody.velocity.dy);
    }

    else if (isTouched && rightMovement){
        player.physicsBody.velocity=CGVectorMake(PLAYERSPEED,
                              player.physicsBody.velocity.dy);
    }

}

Answer 1

您应该考虑的一件事是同时更改 leftMovement 的值和 rightMovement当用户触摸屏幕的另一侧时，否则向右移动 update方法永远不会被调用。

if (location.x < screenWidth/2){
    leftMovement = YES;
    rightMovement = NO;
    [player runLeft];
}
else {
    rightMovement = YES;
    leftMovement = NO;
    [player runRight];
}