I'd like to disable two-finger scrolling in my UIScrollView.
I subclassed it and tweaked its built-in gesture recognizers with the following code:
for (UIGestureRecognizer *mgestureRecognizer in scroller.gestureRecognizers) {
if ([mgestureRecognizer isKindOfClass:[UIPanGestureRecognizer class]])
{
UIPanGestureRecognizer *mpanGR = (UIPanGestureRecognizer *) mgestureRecognizer;
mpanGR.minimumNumberOfTouches = 1;
mpanGR.maximumNumberOfTouches = 1;
}
if ([mgestureRecognizer isKindOfClass:[UISwipeGestureRecognizer class]])
{
UISwipeGestureRecognizer *mswipeGR = (UISwipeGestureRecognizer *) mgestureRecognizer;
mswipeGR.numberOfTouchesRequired = 1;
}
For some reason, maximumNumberOfTouches does not seem to work. I can still scroll with one or two fingers. If I change both properties to 2, I can successfully disable one-finger scrolling and require two touches.
Any ideas?
I realize this is an old thread, but it took me a long time to figure this out, so I thought I would share. Here's what I did to disable two-finger scrolling:
// 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];
if you are using iOS SDK over 5.0, maybe you can use ui pan gesture recognizer directly.
@property (strong, nonatomic) IBOutlet UIScrollView *scrollView;
......
[self.scrollView.panGestureRecognizer setMinimumNumberOfTouches:1];
[self.scrollView.panGestureRecognizer setMaximumNumberOfTouches:1];
I can confirm this is still an issue in iOS 8, but only when the UIPanGestureRecognizer is underlying a UIScrollView. Creating a UIView with a fresh UIPanGestureRecognizer and setting its maximumNumberOfTouches property works as expected.
Submitted rdar://20890684 and copied to http://openradar.appspot.com/radar?id=6191825677189120. Please feel free to dupe.
PROBLEM:
When the UIPanGestureRecognizer is underlying a UIScrollView (which unfortunately does also effect UIPageViewController) the maximumNumberOfTouches is not behaving as expected - the minimumNumberOfTouches however always limits the lower end correctly.
When monitoring these parameters they seem to do their job - it's just that UIScrollView doesn't honor them and ignores their values!
REMEDY:
You can find the solution in my answer to:
UIScrollView scrolling only with one finger
