Move pageViewController with button (objective-c) - ios

Question

I have a pageViewController which brings different images to the screen on each swipe. The paging works with the gesture great. However, I am trying to implement a button which does the paging as well. I have a button on the top left called "Back" and a button on the top right called "Next". I can't get these buttons to work.
Note: OnboardingChildViewController is the child controller of LoginSignUpController
Code:
LoginSignUpViewController.m:
#pragma mark - Paging delegate
- (OnboardingChildViewController *)viewControllerAtIndex:(NSUInteger)index {
OnboardingChildViewController *childViewController = [[OnboardingChildViewController alloc] initWithNibName:#"OnboardingChildViewController" bundle:nil];
childViewController.index = index;
return childViewController;
}
- (UIViewController *)pageViewController:(UIPageViewController *)pageViewController viewControllerBeforeViewController:(UIViewController *)viewController {
NSUInteger index = [(OnboardingChildViewController *)viewController index];
if (index == 0) {
return nil;
}
// Decrease the index by 1 to return
index--;
return [self viewControllerAtIndex:index];
}
- (UIViewController *)pageViewController:(UIPageViewController *)pageViewController viewControllerAfterViewController:(UIViewController *)viewController {
NSUInteger index = [(OnboardingChildViewController *)viewController index];
index++;
if (index == 5) {
return nil;
}
return [self viewControllerAtIndex:index];
}
- (NSInteger)presentationCountForPageViewController:(UIPageViewController *)pageViewController {
// The number of items reflected in the page indicator.
return 5;
}
- (NSInteger)presentationIndexForPageViewController:(UIPageViewController *)pageViewController {
// The selected item reflected in the page indicator.
return 0;
}
OnboardingChildViewController.m:
- (void)viewDidLoad {
[super viewDidLoad];
self.view.backgroundColor = [UIColor clearColor];
switch(self.index)
{
case 0: {
self.dismissButton.hidden = true;
self.onboardingImage.image = nil;
[self.nextButton setTitle:#"Take a Tour" forState:UIControlStateNormal];
self.onboardingDescription.hidden = true;
self.index = 0;
break;
}
case 1: {
self.dismissButton.hidden = false;
self.onboardingImage.image = [UIImage imageNamed: #"onboardingImage1.png"];
self.onboardingDescription.text = #"Follow users to see their content in your feed";
self.index = 1;
break;
}
case 2: {
self.dismissButton.hidden = false;
self.onboardingImage.image = [UIImage imageNamed: #"onboardingImage2.png"];
self.onboardingDescription.text = #"Listen to Stations based on your interest";
self.index = 2;
break;
}
case 3: {
self.dismissButton.hidden = false;
self.onboardingImage.image = [UIImage imageNamed: #"onboardingImage3.png"];
self.onboardingDescription.text = #"Easily Search for Users, Posts, and Stations";
self.index = 3;
break;
}
default: {
self.dismissButton.hidden = false;
self.onboardingImage.image = [UIImage imageNamed: #"onboardingImage4.png"];
[self.nextButton setTitle:#"Sign Up" forState:UIControlStateNormal];
self.onboardingDescription.text = #"Post Photos, Videos, Audio, and Live Video to Stations";
self.index = 4;
break;
}
}
}
- (IBAction)backButton:(id)sender {
//NEED TO MOVE PAGEVIEWCONTROLLER BACK.... self.index--?
}
- (IBAction)nextButton:(id)sender {
//NEED TO MOVE PAGEVIEWCONTROLLER FORWARD.... self.index++?
}

Answer 1

Call setViewControllers and pass in the ViewController you want to display
https://developer.apple.com/library//ios/documentation/UIKit/Reference/UIPageViewControllerClassReferenceClassRef/index.html#//apple_ref/occ/instm/UIPageViewController/setViewControllers:direction:animated:completion: