Disable 2 finger scrolling in UIScrollView

Question

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:

Answer 1

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];

Answer 2

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];

Answer 3

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.

Answer 4

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