ios - 在同一个 UIView 子类上用一根手指滑动和两根手指滑动

Question

我有 UITableViewCell 的自定义实现。 UITableViewCell 可以向左或向右滑动。 我使用 UIPanGestureRecognizer 来实现相同的目的。

UIGestureRecognizer* recognizer = [[UIPanGestureRecognizer alloc] initWithTarget:self action:@selector(handlePan:)];
        recognizer.delegate = self;
        [self addGestureRecognizer:recognizer];

           }

#pragma mark - horizontal pan gesture methods
-(BOOL)gestureRecognizerShouldBegin:(UIPanGestureRecognizer *)gestureRecognizer {
    CGPoint translation = [gestureRecognizer translationInView:[self superview]];
    // Check for horizontal gesture
    if (fabsf(translation.x) > fabsf(translation.y)) {
        return YES;
     }
    return NO;
}

-(void)handlePan:(UIPanGestureRecognizer *)recognizer {
    if (recognizer.state == UIGestureRecognizerStateBegan) {
    // if the gesture has just started, record the current centre location
        // SOME CODE
    }

    if (recognizer.state == UIGestureRecognizerStateChanged) {
        // translate the center
        //SOME CODE
    }

    if (recognizer.state == UIGestureRecognizerStateEnded) {
        // the frame this cell would have had before being dragged
        //SOME CODE
    }
}

现在我希望能够支持在整个屏幕上两根手指滑动，这样即使在 UITableViewCell 上完成两根手指滑动，也不会触发上述代码。 我怎样才能实现这个目标？

Answer 1

如果您将手势识别器上的 maximumNumberOfTouches 设置为 1，它将不再接受多指滑动:

UIGestureRecognizer* recognizer = [[UIPanGestureRecognizer alloc] initWithTarget:self action:@selector(handlePan:)];
recognizer.maximumNumberOfTouches = 1;