用于iPad应用程序的UIScrollview中的两个手指滑动

Question

实际上我想在UIScrollview中实现左右滑动.我有内容大小(768,1500)的scrollview.我试过这个但问题是有时它没有检测到滑动并在那里执行滚动.所以现在我想禁用2手指触摸滚动.

swipeGesture = [[[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(nextswipedScreen:)] autorelease];
swipeGesture.numberOfTouchesRequired=2;
swipeGesture.direction = UISwipeGestureRecognizerDirectionLeft;         
[self addGestureRecognizer:swipeGesture];

swipeGesture = [[[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(previousswipedScreen:)] autorelease];
swipeGesture.numberOfTouchesRequired=2;
swipeGesture.direction = UISwipeGestureRecognizerDirectionRight;            
[self addGestureRecognizer:swipeGesture]; 

我已尝试自定义scrollview,但我有touchesBegan方法的问题.它不是每次都打电话.即使我尝试了这个但不能在UIScrollview中停止两个手指滚动.

for (UIGestureRecognizer *mgestureRecognizer in _scrollView.gestureRecognizers) {     
        if ([mgestureRecognizer  isKindOfClass:[UIPanGestureRecognizer class]])
        {
            UIPanGestureRecognizer *mpanGR = (UIPanGestureRecognizer *) mgestureRecognizer;
            mpanGR.minimumNumberOfTouches = 1; 
            mpanGR.maximumNumberOfTouches = 1;
        }
    }

如果您有任何解决方案或替代方案,请告诉我.

Answer 1

我有同样的问题; 我需要禁用双指滚动,以便我可以检测到左手或右手的双指滑动.这是我设置滚动视图的方法:

- (void) setUpGestureHandlersOnScrollView:(UIScrollView *)scrollView {
    // set up a two-finger pan recognizer as a dummy to steal two-finger scrolls from the scroll view
    // we initialize without a target or action because we don't want the two-finger pan to be handled
    UIPanGestureRecognizer *twoFingerPan = [[UIPanGestureRecognizer alloc] init];
    twoFingerPan.minimumNumberOfTouches = 2;
    twoFingerPan.maximumNumberOfTouches = 2;
    [scrollView addGestureRecognizer:twoFingerPan];

    // set up the two-finger left and right swipe recognizers
    UISwipeGestureRecognizer *twoFingerSwipeLeft = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(handleGestureFrom:)];
    twoFingerSwipeLeft.direction = UISwipeGestureRecognizerDirectionLeft;
    twoFingerSwipeLeft.numberOfTouchesRequired = 2;
    [scrollView addGestureRecognizer:twoFingerSwipeLeft];

    UISwipeGestureRecognizer *twoFingerSwipeRight = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(handleGestureFrom:)];
    twoFingerSwipeRight.direction = UISwipeGestureRecognizerDirectionRight;
    twoFingerSwipeRight.numberOfTouchesRequired = 2;
    [scrollView addGestureRecognizer:twoFingerSwipeRight];

    // prevent the two-finger pan recognizer from stealing the two-finger swipe gestures
    // this is essential for the swipe recognizers to work
    [twoFingerPan requireGestureRecognizerToFail:twoFingerSwipeLeft];
    [twoFingerPan requireGestureRecognizerToFail:twoFingerSwipeRight];
}

处理程序方法应如下所示:

- (void)handleGestureFrom:(UISwipeGestureRecognizer *)recognizer {
    if ([recognizer numberOfTouches] == 2) {
        // do whatever you need to do
    }
}