Is it possible to Turn page programmatically in UIPageViewController

Question

Is it possible to turn page programmatically in UIPageViewController

User · Answer

Here is a solution using UIPageViewControllerDataSource methods   The code keeps track of the current displayed view controller in the UIPageViewController         property  nonatomic  strong  UIViewController  currentViewController   property  nonatomic  strong  UIViewController  nextViewController        First initialize currentViewController to the initial view controller set for the UIPageViewController   -  void  viewDidLoad        super viewDidLoad               self currentViewController   self viewControllers 0                self pageViewController setViewControllers    self currentViewController  direction  dir animated  YES completion  nil         Then keep track of currentViewController in the UIPageViewControllerDelegate methods  pageViewController  willTransitionToViewControllers  and pageViewController didFinishAnimating previousViewControllers transitionCompleted     -  nullable UIViewController    pageViewController   UIPageViewController    pageViewController viewControllerBeforeViewController   UIViewController    viewController       NSInteger idx    self viewControllers indexOfObject  viewController       if  idx  gt  0            return self viewControllers idx - 1         else           return nil           -  nullable UIViewController    pageViewController  UIPageViewController   pageViewController viewControllerAfterViewController   UIViewController    viewController       NSInteger idx    self viewControllers indexOfObject  viewController       if  idx    NSNotFound            return nil        else           if  idx   1  lt  self viewControllers count                return self viewControllers idx   1             else               return nil                     -  void  pageViewController  UIPageViewController   pageViewController willTransitionToViewControllers  NSArray lt UIViewController   gt    pendingViewControllers       self nextViewController    pendingViewControllers firstObject      -  void pageViewController  UIPageViewController   pageViewController didFinishAnimating  BOOL finished previousViewControllers  NSArray lt UIViewController   gt    previousViewControllers transitionCompleted  BOOL completed       if  completed            self currentViewController   self nextViewController            Finally  in the method of your choice  in the example below it s -  IBAction  onNext   id  sender   you can programmatically switch to the next or previous controller using UIPageViewControllerDataSouce methods pageViewController viewControllerBeforeViewController    pageViewController viewControllerAfterViewController  to get the next or prev view controller and navigate to it by calling  self pageViewController setViewControllers    vc  direction  UIPageViewControllerNavigationDirectionForward animated  YES completion  nil     -  void  onNext       UIViewController  vc    self pageViewController  self tutorialViewController viewControllerAfterViewController  self currentViewController       if  vc    nil            self currentViewController   vc           self tutorialViewController setViewControllers    vc  direction  UIPageViewControllerNavigationDirectionForward animated  YES completion  nil

User · Answer

However using this  self pageViewController setViewControllers  method call does not call  viewDidDissapear  on the viewController for the page that has been turned away  whereas manually turning a page does call viewDidDissapear on the turned away page  I believe this is the cause of my crash    The number of view controllers provided  0  doesn t match the number required  1  for the requested transition

User · Answer

Since I needed this as well  I ll go into more detail on how to do this   Note   I assume you used the standard template form for generating your UIPageViewController structure - which has both the modelViewController and dataViewController created when you invoke it   If you don t understand what I wrote - go back and create a new project that uses the UIPageViewController as it s basis   You ll understand then   So  needing to flip to a particular page involves setting up the various pieces of the method listed above   For this exercise  I m assuming that it s a landscape view with two views showing   Also  I implemented this as an IBAction so that it could be done from a button press or what not - it s just as easy to make it selector call and pass in the items needed   So  for this example you need the two view controllers that will be displayed - and optionally  whether you re going forward in the book or backwards   Note that I merely hard-coded where to go to pages 4  amp  5 and use a forward slip  From here you can see that all you need to do is pass in the variables that will help you get these items     - IBAction  flipToPage  id sender           Grab the viewControllers at position 4  amp  5 - note  your model is responsible for providing these           Technically  you could have them pre-made and passed in as an array containing the two items         DataViewController  firstViewController    self modelController viewControllerAtIndex 4 storyboard self storyboard       DataViewController  secondViewController    self modelController viewControllerAtIndex 5 storyboard self storyboard            Set up the array that holds these guys         NSArray  viewControllers   nil       viewControllers    NSArray arrayWithObjects firstViewController  secondViewController  nil            Now  tell the pageViewContoller to accept these guys and do the forward turn of the page          Again  forward is subjective - you could go backward   Animation is optional but it s          a nice effect for your audience          self pageViewController setViewControllers viewControllers direction UIPageViewControllerNavigationDirectionForward animated YES completion NULL            Voila  - c est fin

User · Answer

I could totally be missing something here  but this solution seems a lot simpler than many others proposed   extension UIPageViewController       func goToNextPage animated  Bool   true  completion    Bool  - gt  Void     nil            if let currentViewController   viewControllers  0                if let nextPage   dataSource  pageViewController self  viewControllerAfter  currentViewController                    setViewControllers  nextPage   direction   forward  animated  animated  completion  completion

User · Answer

-  void moveToPage        NSUInteger pageIndex     ContentViewController     self pageViewController viewControllers objectAtIndex 0   pageIndex       pageIndex         ContentViewController  viewController    self viewControllerAtIndex pageIndex    if  viewController    nil            return             self pageViewController setViewControllers   viewController  direction UIPageViewControllerNavigationDirectionForward animated YES completion nil          now call this method   self moveToPage    I hope it works

User · Answer

As  samwize pointed out  the way of paginating is by using  setViewControllers array   Here s the way I did it  I have my datasource and the delegate separate  You can call this method and only change the  next  view  Previously you have to apply the paging rules   That is  you have to check direction and the next controller  If you use that method with your custom datasource the array of controllers that you re displaying won t change  since you ll use a custom array on a NSObject subclass    Using your own datasource the method just sets a new view  with specific direction   Since you will still controll the pages that will display when normally swiping

User · Answer

In Swift   import UIKit  extension HomeViewController           MARK  - Carousel management       func startTimerForMovingCarousel let numberOfSecondsBetweenFiringsOfTheTimer  NSTimeInterval            if  self timerForMovingCarousel    nil                self timerForMovingCarousel   NSTimer scheduledTimerWithTimeInterval numberOfSecondsBetweenFiringsOfTheTimer                                                                              target  self                                                                              selector   moveCarousel                                                                               userInfo  nil                                                                              repeats  true                       func moveCarousel             println  I move the carousel             let currentContentViewControllerDisplayed   self pageViewController  viewControllers 0  as  ContentViewController          var index  Int   currentContentViewControllerDisplayed index          if index    self arrayViewControllers count - 1               index   0           else                 index                    let contentViewControllerToDisplay   self arrayViewControllers index  as  ContentViewController          self pageViewController setViewControllers  contentViewControllerToDisplay                                                       direction  UIPageViewControllerNavigationDirection Forward                                                      animated  true                                                      completion  nil           self pageControl currentPage   contentViewControllerToDisplay index            func invalidateTimerForMovingCarousel             if  self timerForMovingCarousel    nil                self timerForMovingCarousel invalidate               self timerForMovingCarousel   nil

User · Answer

As the ViewControllers are embedded in the PageViewController all you have to do is    Retrieve parent view controller and cast as your relevant class  Use that parents datasource property to get the next ViewController  Use the SetParentViewControllers method to set and transition to the next page    Example in Xamarin  but functionally similar to Swift etc  Following code would be in Button Click delegate in one of the ViewControllers being shown as a page   var parent   ParentViewController as WelcomePageViewController  var next   parent DataSource GetNextViewController parent  this    parent SetViewControllers new UIViewController     next    UIPageViewControllerNavigationDirection Forward  true  null

User · Answer

In case if PAGE CONTROL to indicate current page is O  amp  amp  You want pages to navigate via scroll  amp  also by clicking custom buttons in Page ViewController  below may be helpful     Set Delegate  amp  Data Source for PageView controller  Say in View Did Load     self pageViewController dataSource   self     self pageViewController delegate   self      Delegates called viewControllerBeforeViewController when User Scroll to previous page    -  UIViewController   pageViewController  UIPageViewController   pageViewController viewControllerBeforeViewController  UIViewController   viewController         nextBtn setTitle   Next  forState UIControlStateNormal        NSUInteger index     PageContentViewController   viewController  pageIndex       if  index    NSNotFound           return nil       else if  index  gt  0           index--       else          return nil                    return  self viewControllerAtIndex index                  Delegate called viewControllerAfterViewController when User Scroll to next page   -  UIViewController   pageViewController  UIPageViewController   pageViewController viewControllerAfterViewController  UIViewController   viewController       NSUInteger index     PageContentViewController   viewController  pageIndex   if  index    NSNotFound       return nil   else if  index  lt  3       index     else      return nil    return  self viewControllerAtIndex index       Delegate called while transition of pages  The need to apply logic in this delegate is to maintain the index of current page    -  void pageViewController  UIPageViewController   pageViewController willTransitionToViewControllers  NSArray   pendingViewControllers    buttonIndex    int   PageContentViewController   pendingViewControllers firstObject  pageIndex       - void pageViewController  UIPageViewController   pageViewController didFinishAnimating  BOOL finished previousViewControllers  NSArray   previousViewControllers transitionCompleted  BOOL completed      if  buttonIndex    0        backButton hidden   true   else if  buttonIndex     self pageImages count  - 1        backButton hidden   false        nextBtn setTitle   Begin  forState UIControlStateNormal    else       backButton hidden   false           Custom button s  Prev  amp  next  Logic  - void backBtnClicked  id sender      if  buttonIndex  gt  0   buttonIndex -  1            if  buttonIndex  lt  1             backButton hidden   YES            if  buttonIndex  gt  0               nextBtn setTitle   Next  forState UIControlStateNormal           PageContentViewController  startingViewController    self viewControllerAtIndex buttonIndex           NSArray  viewControllers     startingViewController            self pageViewController setViewControllers viewControllers direction UIPageViewControllerNavigationDirectionForward animated NO completion nil              - void nextBtnClicked  id sender  if  buttonIndex  lt  3   buttonIndex    1    if buttonIndex     pageImages count        Navigate Outside Pageview controller          else              if  buttonIndex   3               nextBtn setTitle   Begin  forState UIControlStateNormal              backButton hidden   NO       PageContentViewController  startingViewController    self viewControllerAtIndex buttonIndex       NSArray  viewControllers     startingViewController        self pageViewController setViewControllers viewControllers direction UIPageViewControllerNavigationDirectionForward animated NO completion nil            BUTTON INDEX  amp  MAX COUNT - NSInteger presentationCountForPageViewController  UIPageViewController   pageViewController      return  self pageImages count     - NSInteger presentationIndexForPageViewController  UIPageViewController   pageViewController      return  buttonIndex

User · Answer

I also needed a button to navigate left on a PageViewController  one that should do exactly what you would expect from the swipe motion   Since I had a few rules already in place inside  pageViewController viewControllerBeforeViewController  for dealing with the natural swipe navigation  I wanted the button to re-use all that code  and simply could not afford to use specific indexes to reach pages as the previous answers did  So  I had to take an alternate solution   Please note that the following code is for a Page View Controller that is a property inside my custom ViewController  and has its spine set to mid   Here is the code I wrote for my Navigate Left button   -  IBAction btnNavigateLeft Click  id sender           Calling the PageViewController to obtain the current left page     UIViewController  currentLeftPage     pageController viewControllers objectAtIndex 0           Creating future pages to be displayed     NSArray  newDisplayedPages   nil      UIViewController  newRightPage   nil      UIViewController  newLeftPage   nil          Calling the delegate to obtain previous pages        My  pageViewController viewControllerBeforeViewController  method returns nil if there is no such page  first page of the book       newRightPage    self pageViewController  pageController viewControllerBeforeViewController currentLeftPage       if  newRightPage            newLeftPage    self pageViewController  pageController viewControllerBeforeViewController newRightPage              if  newLeftPage            newDisplayedPages     NSArray alloc  initWithObjects newLeftPage  newRightPage  nil                 If there are two new pages to display  show them with animation      if  newDisplayedPages              pageController setViewControllers newDisplayedPages direction UIPageViewControllerNavigationDirectionReverse animated YES completion nil             You can do something very similar to make a right navigation button from here

User · Answer

What about using methods from dataSource   UIViewController  controller    pageViewController dataSource pageViewController self pageViewController viewControllerAfterViewController pageViewController viewControllers firstObject    pageViewController setViewControllers   controller  direction UIPageViewControllerNavigationDirectionForward animated YES completion nil     Analogically for backward

User · Answer

Swift 4   I needed to go to the next controller when i tap next on a  pagecontroller view controller and also update the pageControl index  so this was the best and most straightforward solution for me   let pageController   self parent as  PageViewController  pageController setViewControllers  parentVC orderedViewControllers 1    direction   forward  animated  true  completion  nil   pageController pageControl currentPage   1

User · Answer

Here s another code example for a single paged view  Implementation for viewControllerAtIndex is omitted here  it should return the correct view controller for the given index   -  void changePage  UIPageViewControllerNavigationDirection direction       NSUInteger pageIndex     FooViewController      pageViewController viewControllers objectAtIndex 0   pageIndex       if  direction    UIPageViewControllerNavigationDirectionForward            pageIndex              else           pageIndex--             FooViewController  viewController    self viewControllerAtIndex pageIndex        if  viewController    nil            return               pageViewController setViewControllers   viewController                                    direction direction                                    animated YES                                  completion nil       Pages can be changed by calling   self changePage UIPageViewControllerNavigationDirectionReverse    self changePage UIPageViewControllerNavigationDirectionForward

User · Answer

I m working on It since yesterday and I finally did It work  I couldn t use standard template totally  because I have three differents viewControllers as childviews   1 - rootViewController  2 - model  3 - viewControllers 3 1 - VC1  3 2 - VC2  3 3 - VC3  Note  all of VCs has Storyboard ID    I needed a trigger button only in the first one VC  so I added one property for pageViewController and model    import  lt UIKit UIKit h gt   import  Model h    interface VC1   UIViewController   property  nonatomic  strong  UIPageViewController  thePageViewController   property  nonatomic  strong  SeuTimePagesModel  theModel    end   I rewrote the model s init method to pass storyboard and pageViewController as parameters  so I could set those to my VC1   -  id initWithStoryboard  UIStoryboard   storyboard    andPageViewController  UIPageViewController   controller       if  self    super init                 VC1  vc1    storyboard instantiateViewControllerWithIdentifier   VC1            vc1 pageViewController   controller          vc1 model   self           VC2  vc2    storyboard instantiateViewControllerWithIdentifier   VC2            VC3  vc3    storyboard instantiateViewControllerWithIdentifier   VC3            self pageData     NSArray alloc  initWithObjects vc1  vc2  vc3  nil              return self      Finally  I added an IBAction in my vc1 to trigger the pageViewController method setViewControllers direction animated completion    -  IBAction go  id sender       VC2  vc2     model pages objectAtIndex 1       NSArray  viewControllers     vc2         pageViewController setViewControllers viewControllers                                   direction UIPageViewControllerNavigationDirectionForward                                    animated YES                                  completion nil       Note I don t need to find VCs indexes  my button takes me to my second VC  but Its not hard get all of indexes  and keep track of your childviews   -  IBAction selecionaSeuTime  id sender       NSUInteger index     model pages indexOfObject self       index         VC2  vc2     model pages objectAtIndex 1       NSArray  viewControllers     vc2         pageViewController setViewControllers viewControllers                                   direction UIPageViewControllerNavigationDirectionForward                                    animated YES                                  completion nil       I hope It helps you

User · Answer

For single page  I just edited the answer of  Jack Humphries  - void viewDidLoad     counter   0    - IBAction buttonClick  id sender     counter      DataViewController  secondVC    self modelController viewControllerAtIndex counter storyboard self storyboard     NSArray  viewControllers   nil              viewControllers    NSArray arrayWithObjects secondVC  nil                self pageViewController setViewControllers viewControllers direction UIPageViewControllerNavigationDirectionForward animated YES completion NULL

User · Answer

This code worked nicely for me  thanks    This is what i did with it  Some methods for stepping forward or backwards and one for going directly to a particular page  Its for a 6 page document in portrait view  It will work ok if you paste it into the implementation of the RootController of the pageViewController template   - IBAction pageGoto  id sender          get page to go to     NSUInteger pageToGoTo   4         get current index of current page     DataViewController  theCurrentViewController    self pageViewController viewControllers   objectAtIndex 0       NSUInteger retreivedIndex    self modelController indexOfViewController theCurrentViewController          get the page s  to go to     DataViewController  targetPageViewController    self modelController viewControllerAtIndex  pageToGoTo - 1  storyboard self storyboard        DataViewController  secondPageViewController    self modelController viewControllerAtIndex  pageToGoTo  storyboard self storyboard          put it or them if in landscape view  in an array     NSArray  theViewControllers   nil          theViewControllers    NSArray arrayWithObjects targetPageViewController  secondPageViewController  nil           check which direction to animate page turn then turn page accordingly     if  retreivedIndex  lt   pageToGoTo - 1   amp  amp  retreivedIndex     pageToGoTo - 1             self pageViewController setViewControllers theViewControllers direction UIPageViewControllerNavigationDirectionForward animated YES completion NULL              if  retreivedIndex  gt   pageToGoTo - 1   amp  amp  retreivedIndex     pageToGoTo - 1             self pageViewController setViewControllers theViewControllers direction UIPageViewControllerNavigationDirectionReverse animated YES completion NULL              - IBAction pageFoward  id sender          get current index of current page     DataViewController  theCurrentViewController    self pageViewController viewControllers objectAtIndex 0       NSUInteger retreivedIndex    self modelController indexOfViewController theCurrentViewController          check that current page isn t first page     if  retreivedIndex  lt  5              get the page to go to         DataViewController  targetPageViewController    self modelController viewControllerAtIndex  retreivedIndex   1  storyboard self storyboard              put it or them if in landscape view  in an array         NSArray  theViewControllers   nil              theViewControllers    NSArray arrayWithObjects targetPageViewController  nil              add page view          self pageViewController setViewControllers theViewControllers direction UIPageViewControllerNavigationDirectionForward animated YES completion NULL               - IBAction pageBack  id sender           get current index of current page     DataViewController  theCurrentViewController    self pageViewController viewControllers objectAtIndex 0       NSUInteger retreivedIndex    self modelController indexOfViewController theCurrentViewController          check that current page isn t first page     if  retreivedIndex  gt  0          get the page to go to     DataViewController  targetPageViewController    self modelController viewControllerAtIndex  retreivedIndex - 1  storyboard self storyboard          put it or them if in landscape view  in an array     NSArray  theViewControllers   nil          theViewControllers    NSArray arrayWithObjects targetPageViewController  nil          add page view      self pageViewController setViewControllers theViewControllers direction UIPageViewControllerNavigationDirectionReverse animated YES completion NULL

User · Answer

Yes it is possible with the method   -  void setViewControllers  NSArray   viewControllers                   direction  UIPageViewControllerNavigationDirection direction                    animated  BOOL animated                  completion  void     BOOL finished  completion     That is the same method used for setting up the first view controller on the page  Similar  you can use it to go to other pages   Wonder why viewControllers is an array  and not a single view controller   That s because a page view controller could have a  spine   like in iBooks   displaying 2 pages of content at a time  If you display 1 page of content at a time  then just pass in a 1-element array   An example in Swift   pageContainer setViewControllers  displayThisViewController   direction   Forward  animated  true  completion  nil

[ios] Is it possible to Turn page programmatically in UIPageViewController?

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