ios - UIPageViewController transition not working correctly -


i have uipageviewcontroller page curl (not transition type matters neither works), second page doesn't display until animation finished. code use work, no longer, ideas great

not working

the code follows:

- (void)viewdidload {     self.pageviewcontroller = [self.storyboard instantiateviewcontrollerwithidentifier:@"pageviewcontroller"];     self.pageviewcontroller.datasource = self;     self.pageviewcontroller.delegate = self;     // other code deleted, easy reading }   - (psalmviewcontroller *)viewcontrolleratindex:(nsuinteger)index {     if (([self.mdelegate.mpsalms count] == 0) || (index >= [self.mdelegate.mpsalms count]))         return nil;      // create new view controller , pass suitable data.     psalmviewcontroller *controller = [self.storyboard instantiateviewcontrollerwithidentifier:@"psalmviewcontroller"];     psalmdata *data = [self.mdelegate.mpsalms objectatindex:index];     [controller setupview:index psalm:data];     self.mnextpsalm = controller;      return controller; }  #pragma mark - page view controller data source  - (uiviewcontroller *)pageviewcontroller:(uipageviewcontroller *)pageviewcontroller viewcontrollerbeforeviewcontroller:(uiviewcontroller *)viewcontroller {     if (self.mnextindex == 0 || self.mnextindex == nsnotfound)         return nil;      self.mnextindex = self.mpageindex - 1;     self.manimating = true;     nslog(@"prev %lud", (unsigned long)self.mnextindex);     return [self viewcontrolleratindex:self.mnextindex]; }  - (uiviewcontroller *)pageviewcontroller:(uipageviewcontroller *)pageviewcontroller viewcontrollerafterviewcontroller:(uiviewcontroller *)viewcontroller {     if (self.mnextindex == nsnotfound)         return nil;      if (self.mnextindex + 1 == [self.mdelegate.mpsalms count])         return nil;      self.mnextindex = self.mpageindex + 1;     self.manimating = true;     nslog(@"next %lu", (unsigned long)self.mnextindex);     return [self viewcontrolleratindex:self.mnextindex]; }  - (nsinteger)presentationcountforpageviewcontroller:(uipageviewcontroller *)pageviewcontroller {     return [self.mdelegate.mpsalms count]; }  - (nsinteger)presentationindexforpageviewcontroller:(uipageviewcontroller *)pageviewcontroller {     return 0; }  - (void)pageviewcontroller:(uipageviewcontroller *)pageviewcontroller didfinishanimating:(bool)finished previousviewcontrollers:(nsarray<uiviewcontroller *> *)previousviewcontrollers transitioncompleted:(bool)completed {     if (completed)     {         self.mpageindex = self.mnextindex;         [self setcurrentpsalm:self.mnextpsalm];     }     else if (finished)     {         self.mnextindex = self.mpageindex;     }      if (completed || finished)         self.manimating = false;     nslog(@"c %d f %d", completed, finished); }

again appreciated, have no idea causing problem.


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