I have been adding several subviews ("touch subviews") to a scroll view which respond to touches. The touch delegate methods in each of these subviews all fire nicely.
I have one subview (bodyClock) which holds the main content of the scroll view and is the viewForZoomingInScrollView. In order for the "touch" subviews to zoom properly I find now that I have to add them the bodyClock subview instead of the scroll view. When I do this, however, the "touch subviews" no longer respond to touches.
I have tried all sort of things with first responder without any success. Any help pointing me in the right direction would be appreciated.
OK, I found my problem I had a subview acting as a time mask in the scroll view that I think was responding to touches. This became evident when I noticed that the touch subViews did not respond to touches while the mask was over them. Because the mask was a subview to the scroll view, it would move when zooming such that a touch subview in the bodyClock view would come out from underneath the mask and suddenly start working.
Moving the mask from the scroll view to the bodyClock subView along with the "touch subviews" fixed my problem. Now all the subviews scroll and zoom properly, and respond to touches.
Related
I am using a UIView subclass which can be resized by dragging on the borders and it is added as subview on a UIScrollView. I am also using a UIGestureRecognizer subclass to move the view on the UIScrollView such that the custom view remains visible and the scrollview autoscrolls.
This setup is working as intended but for one problem. Whenever the custom view is resized, the touches on UIScrollView are lost, i.e the scrollview does not recognise the tap or scroll on it unless the custom view is tapped or dragged once again. I have found that after resizing, neither custom UIView nor custom UIGestureRecognizer's touches began, cancelled or ended are called.
Where might the problem be?
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 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.
I have a UIScrollView that takes up a portion of the screen, and its basic functions (scrolling and zooming) work just fine. For example, I can grab the scrollview with two fingers, and scroll left and right, while zooming in or out on the content.
I want to add the ability to move the UIScrollView up and down at the same time. Please note that I do not want to move the content of the scroll view, but the scroll view itself.
I have attempted to add a UIPinchGestureRecognizer to the UIScrollView which has allowed me to grab and move the scroll view, but I then lose the zoom and scrolling. It seems that adding a gesture recognizer makes all of the default actions stop (also, when I call setZoomScale, I get an EXC_BAD_ACCESS).
I've also considered checking touches, but touches on the UIScrollView aren't registered with the main view so I can't change its location using those values.
Does anyone have any suggestions on how this might be accomplished?
I have a rotating carousel menu made up of 6 UIViews that were added as subViews to self.view. When you rotate the carousel, some subviews are partially behind the subview closest to the user but the problem is that the subview closest to the user may not have been added after the one behind it so when I touch it, the one behind it gets triggered.
My question is, is there a way to programmatically use bringToFront whenever a subview is touched so that it will not matter whether or not it was added first or last to the view.
When you have 2 views responding to touch events and one is in front of the other, the other one will never receive the touch.
Instead of messing around with the event chain (aka subclassing UIView and overriding hitTest…) I'd suggest you reorder the views while spinning the carousel.
The view which appears to be in front should be the topmost view in the view hierarchy.