在iPad应用程序的UIScrollview中用两根手指轻扫 [英] Two finger swipe in UIScrollview for iPad application
问题描述
实际上,我想在UIScrollview中左右滑动.我有内容大小(768,1500)的scrollview.我已经尝试过了,但是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手指触摸上的滚动.
Actually i want to implement swipe left and right in UIScrollview. i have scrollview with content size (768,1500). i have tried this but problem is that sometimes its not detecting swipe and perform scrolling there. so now i want to disable scrolling on 2 finger touch.
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];
我为此尝试过自定义滚动视图,但是touchesBegan方法有问题.它不是每次都在呼唤.即使我尝试了此操作,但也无法在UIScrollview中停止两根手指滚动.
i have tried custom scrollview for that but i have problem with touchesBegan method. its not calling every time. even i tried this but not able to stop two finger scroll in UIScrollview.
for (UIGestureRecognizer *mgestureRecognizer in _scrollView.gestureRecognizers) {
if ([mgestureRecognizer isKindOfClass:[UIPanGestureRecognizer class]])
{
UIPanGestureRecognizer *mpanGR = (UIPanGestureRecognizer *) mgestureRecognizer;
mpanGR.minimumNumberOfTouches = 1;
mpanGR.maximumNumberOfTouches = 1;
}
}
让我知道您是否有解决方案或替代方案.
Let me know if you have any solution or alternative for that.
推荐答案
我遇到了同样的问题;我需要禁用两指滚动,以便可以检测到向左或向右滑动的两指.这是设置滚动视图的步骤:
I had the same problem; I needed to disable two-finger scrolling so that I could detect a two-finger swipe to the left or right. Here's what I did to set up my scroll view:
- (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:
The handler method should look something like this:
- (void)handleGestureFrom:(UISwipeGestureRecognizer *)recognizer {
if ([recognizer numberOfTouches] == 2) {
// do whatever you need to do
}
}
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