ios - Implementing a horizontal UIPanGestureRecognizer within a vertical UIScrollView -


i know topic has been discussed @ length can't find proper solutions problem despite searching.

i'm trying replicate behaviour experience in mail.app's table view in scroll view. want user able scroll through view of content normal, able swipe items out of view.

i have standard uiscrollview, scrolls vertically. have several views have uipangesturerecognizers attached them. view controller delegate these gesture recognizers, ensure normal scrolling of scroll view.

- (bool)gesturerecognizer:(uigesturerecognizer *)gesturerecognizer shouldrecognizesimultaneouslywithgesturerecognizer:(uigesturerecognizer *)othergesturerecognizer {     if ([gesturerecognizer iskindofclass:[uipangesturerecognizer class]] && gesturerecognizer != self.scrollview.pangesturerecognizer) return yes;     return no; }

the issue these gesture recognizers recognize when user begins scrolling scroll view. understand why happening, , i've tried dozens of ways try work around it.

the biggest frustration of mine uiscrollview's gesture recognizer never fails. if did, make other gesture recognizers require fail before recognizing.

the last option i've settled (which sort of works), best described as:

  1. the pan recognizer begins
  2. i record point of touch
  3. every time recognizer changes, check ensure points along (nearly) perfect horizontal line.
  4. if there more 5 sequential points validate, continue treat recognizer normal , disable scrolling in scroll view.

is best/only way this?


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