检测 2 次滑动而不中断触摸

Question

我正在尝试实现将改变单位方向的游戏控制 移动。因此，如果我向右滑动，它会向右滑动，如果我向下滑动，它会向右滑动，等等。

这是cocos2d游戏，我正在使用

CCNode+SFGestureRecognizers

和

UISwipeGestureRecognizer

。

现在我有下一个实现

UISwipeGestureRecognizer *rightSwipeGestureRecognizer = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(handleRightSwipe:)];
        [self addGestureRecognizer:rightSwipeGestureRecognizer];
        rightSwipeGestureRecognizer.direction = UISwipeGestureRecognizerDirectionRight;
        rightSwipeGestureRecognizer.delegate = self;
        [rightSwipeGestureRecognizer release];
        
        UISwipeGestureRecognizer *upSwipeGestureRecognizer = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(handleUpSwipe:)];
        [self addGestureRecognizer:upSwipeGestureRecognizer];
        upSwipeGestureRecognizer.direction = UISwipeGestureRecognizerDirectionUp;
        upSwipeGestureRecognizer.delegate = self;
        [upSwipeGestureRecognizer release];
        
        UISwipeGestureRecognizer *leftSwipeGestureRecognizer = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(handleLeftSwipe:)];
        [self addGestureRecognizer:leftSwipeGestureRecognizer];
        leftSwipeGestureRecognizer.direction = UISwipeGestureRecognizerDirectionLeft;
        leftSwipeGestureRecognizer.delegate = self;
        [leftSwipeGestureRecognizer release];
        
        UISwipeGestureRecognizer *downSwipeGestureRecognizer = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(handleDownSwipe:)];
        [self addGestureRecognizer:downSwipeGestureRecognizer];
        downSwipeGestureRecognizer.direction = UISwipeGestureRecognizerDirectionDown;
        downSwipeGestureRecognizer.delegate = self;
        [downSwipeGestureRecognizer release];

但问题是，要识别以下手势，您需要将手指从屏幕上抬起。如果您在第一次滑动后没有抬起手指，它将仅识别第一次滑动。

现在：

应该如何：

最好的方法是什么？谢谢！

Answer 1

cancelsTouchesInView 应该有所帮助，它可以防止手势识别器识别出手势时取消触摸事件。这将允许其他手势识别器继续检查他们的手势。

  rightSwipeGestureRecognizer.cancelsTouchesInView = NO;
  upSwipeGestureRecognizer.cancelsTouchesInView = NO;
  leftSwipeGestureRecognizer.cancelsTouchesInView = NO;
  downSwipeGestureRecognizer.cancelsTouchesInView = NO;

Answer 2

好的，这是我的解决方案。我认为这不是一个很好的解决方案，但就我而言它是有效的，因为我需要在每个时间间隔得到指导。

所以，在我的

CCLayer

子类中：

#define SWIPE_LENGTH        60
#define SWIPE_TANGENT       2

...

@property(nonatomic, assign) CGPoint latestLocation;

...

-(id) init
{
    if( (self=[super init]) )
        {
            self.isTouchEnabled = YES;
        }
    return self;
}

- (void)ccTouchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
{
    UITouch *touch = [touches anyObject];
    CGPoint location = [touch locationInView:[touch view]];
    location = [[CCDirector sharedDirector] convertToGL:location];
    self.latestLocation = location;
}

- (void)ccTouchesMoved:(NSSet *)touches withEvent:(UIEvent *)event
{
    UITouch *touch = [touches anyObject];
    CGPoint location = [touch locationInView:[touch view]];
    location = [[CCDirector sharedDirector] convertToGL:location];
    CGPoint delataLocation = CGPointMake(location.x - self.latestLocation.x, location.y - self.latestLocation.y);
    if ( sqrt(pow((delataLocation.x), 2) + pow((delataLocation.y), 2) ) > SWIPE_LENGTH ) {
        if (delataLocation.y > 0 && delataLocation.y > SWIPE_TANGENT * ABS(delataLocation.x))
        {
            [self handleSwipeWithDirestion:SDirectionTypeUp];
        } else if (delataLocation.y < 0 && ABS(delataLocation.y) > SWIPE_TANGENT * ABS(delataLocation.x))
        {
            [self handleSwipeWithDirestion:SDirectionTypeDown];
        } else if (delataLocation.x > 0 && delataLocation.x > SWIPE_TANGENT * ABS(delataLocation.y))
        {
            [self handleSwipeWithDirestion:SDirectionTypeRight];
        } else if (delataLocation.x < 0 && ABS(delataLocation.x) > SWIPE_TANGENT * ABS(delataLocation.y))
        {
            [self handleSwipeWithDirestion:SDirectionTypeLeft];
        }
        self.latestLocation = location;
    }
}

Answer 3

你可以像这样子类化

UIGestureRecognizer

：

class CustomSwipeGestureRecognizer: UIGestureRecognizer {
    private var prevLocation = CGPoint(x: 0, y: 0)
    public var dir = ""

    override init(target: Any?, action: Selector?) {
        super.init(target: target, action: action)
        self.cancelsTouchesInView = true
    }

    override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?) {
        let touch = touches.first
        let location = touch?.location(in: self.view) ?? CGPoint(x: 0, y: 0)
        prevLocation = location
    }
    
    override func touchesMoved(_ touches: Set<UITouch>, with event: UIEvent?) {
        let touch = touches.first
        let location = touch?.location(in: self.view) ?? CGPoint(x: 0, y: 0)
        let deltaX = location.x - prevLocation.x
        let deltaY = location.y - prevLocation.y
        let isVertical   = abs(deltaY) > (1.2 * abs(deltaX))
        let isHorizontal = abs(deltaX) > (1.2 * abs(deltaY))
        let distance = sqrt(pow(deltaX, 2) + pow(deltaY, 2))
        if (distance <= 60) {
            return
        }
        if (isVertical) {
            dir = deltaY > 0 ? "down" : "up"
            prevLocation = location
            state = .changed
        } else if (isHorizontal) {
            dir = deltaX > 0 ? "right" : "left"
            prevLocation = location
            state = .changed
        }
    }
    
    override func touchesEnded(_ touches: Set<UITouch>, with event: UIEvent?) {
        state = .ended
    }
    
    override func touchesCancelled(_ touches: Set<UITouch>, with event: UIEvent?) {
        state = .cancelled
    }
}

并在视图控制器中使用它，如下所示：

class MyViewController: UIViewController {

    override func viewDidLoad() {
        super.viewDidLoad()

        let swipeGesture = CustomSwipeGestureRecognizer(target: self, action: #selector(onSwipe))
        self.view.addGestureRecognizer(swipeGesture)
    }

    @objc func onSwipe(sender: CustomSwipeGestureRecognizer) {
        // this callback is called repeatedly with every movement, even when the gesture recognizer has not changed state
        if (sender.dir == "") {
            return
        }
        print(sender.dir)
        sender.dir = ""
    }

}