I have a UIScrollView with an button just outside the content area of the scrollView. The user has to scroll up and hold the spring effect which one finger and push the button with another finger. The problem is that the touch on the button is never detected.
Please see the illustration below
The scroll view in it's initial state. the orange area is the scrollView, the white area the button
The user is now scrolling and holding with one finger to overcome the spring effect of the UIScrollView, and want to click the button
Any suggestions?
Check this out:
UIScrollView blocks all touches while zooming or scrolling
Make sure you have multitouch set to YES on the scrollview and also don't have any subviews with exclusive touch enabled.
Related
I got a scroll view with a bunch of buttons, which I want to both touch and drag.
To choose if it's a touch or a drag (not drag of the scroll view, "physically" dragging the button), I check the pan gesture recognizer of the button to see how far away the drag would be, if it's over a threshold I snap the button into drag mode and, removing it from the scroll view and adding it to my view controller's view (at the same location, so looks like it's in the same place).
This all works kinda smooth, except when I want to scroll and the pan fires at the same time. I need a way for the pan gesture recognizer to choose, based on velocity, if the scroll view should scroll or the button should be dragged.
The question: Is there a way for a UIPanGestureRecognizer to tell a UIScrollView to continue scrolling and cancel itself?
I have UIScrollView with other UIView elements inside. My other UIView elements are mostly segmented controls. If I click on a UISegmentedControl and hold for a second and then try to scroll, then no scrolling happens. I can only scroll when my finger touches and swipes immediately. I checked other iOS applications such as mail. The behavior was that you touch and hold on a mail, then it's highlighted, but as soon as finger moves away, the scrolling happens and highlighting is undone. How can I implement this behavior?
The issue was the property of UIScrollView. The property canCancelContentTouches was set to NO. Because of that, touch events were handled by subviews of scroll view and swiping didn't cause scrolling.
You can follow one of these steps:
If you are using UISegmentedControl over you UIScrollView, instead of that, add the UISegmentedControl over your controller's view.
If you want to use UISegmentedControl over your scrollView, then you have to create a custom scrollView by creating a subclass of UIScrollView and use an image view instead of UISegmentedControl adding the labels which can act as the segments. This is because your UISegmentControl itself is a touch handler and it breaks the UIResponder chain. So, the scrolling might face issues during the touch events.
Please let me know if any of these works. Thanks :)
I have UIScrollView with a UIImageView. The user is able to pan the image vertically.
How do I stop the user from continuing dragging with another finger, or ignore a second touch on the scrollview? Somewhat similar to the dragging behaviour in the photoBrowser of the Facebook app.
Try setting both the canCancelContentTouches and delaysContentTouches properties of your UIScrollView to YES.
When the UIScrollView property canCancelContentTouches is set to YES, it should transfer any scrolling/drag touches to the scroll view and cancel whatever that touch would have been registered in the subview.
The scroll view's delaysContentTouches should be set to YES as well. This will prevent drags from being triggered as taps (because the handler fires off too soon).
and also try this link
http://www.cocoanetics.com/2010/06/hacking-uiscrollview-gesture-recognizers/
I have a UIScrollView filled with buttons that I created programatically.
Paging is enabled and whenever users scroll through the pages rapidly they always end up accidentally clicking buttons that they didn't mean to... Should I be using TouchUpInside or is this the reason for my problem?
One thing I've noticed is that if a user presses the button then slides the scrollview doesn't move but if they slide the scroll view very quickly and let go half way through the scroll and they grabbed the scrollview on the button then the button will become "pressed" is there any way I can have the buttons not do anything if they are clicked while scrolling is in progress or is the solution simpler than that (i.e. just changing the touch event to a different listener)
This did the trick!
setExclusiveTouch:YES
I have seen many similar questions to this but none help me exactly. I have many vertical UISliders filling a wide UIScrollView. If I drag the thumb on the slider I want the horizontal UIScrollView to be locked and only allow vertical sliding. If I drag the UISlider other than on the thumb I want the horizontal UIScrollView scrolling. It currently works if I touch the thumb before dragging.
I have overridden touchesShouldCancelInContentView in the scroll view but never hit the breakpoint in that method.
I had to override touchesShouldBegin:withEvent:inContentView and also set delaysContentTouches to NO to intercept the touch message.