UIPageViewController with array of programatically generated views - ios

Question

So i need to create a UIPageViewController that shows a few views (1-25). Basically i have a quiz app, and for every wrong question i save the question number (1-25) in a NSMutableArray. After the quiz is done i want to show the user which quiz answer was wrong. I have the methods that sets the view of the wrong answers (same methods i use to set the views in the quiz).
This keeps giving me 'Thread1:' errors.
PVCPagesViewController.h
#import <UIKit/UIKit.h>
#import "PVCContentViewController.h"
#interface PVCPagesViewController : UIViewController <UIPageViewControllerDataSource, UIPageViewControllerDelegate>
#property (weak, nonatomic) IBOutlet UIPageControl *pageControl;
#end
.
PVCPagesViewController.m
#import "PVCPagesViewController.h"
#interface PVCPagesViewController () {
NSArray *pages;
}
#property (retain, nonatomic) NSArray *pages;
#property (strong, nonatomic) UIPageViewController *pageController;
#end
#implementation PVCPagesViewController
- (void)viewDidLoad
{
[super viewDidLoad];
// Do any additional setup after loading the view.
//I think my problem is around here?
PVCContentViewController *page1 = [[PVCContentViewController alloc] init];
[page1 example1];
PVCContentViewController *page2 = [[PVCContentViewController alloc] init];
[page1 example2];
PVCContentViewController *page3 = [[PVCContentViewController alloc] init];
[page1 example3];
PVCContentViewController *page4 = [[PVCContentViewController alloc] init];
[page1 example2];
// load the view controllers in our pages array
self.pages = [[NSArray alloc] initWithObjects:page1, page2, page3, page4, nil];
self.pageController = [[UIPageViewController alloc] initWithTransitionStyle:UIPageViewControllerTransitionStyleScroll navigationOrientation:UIPageViewControllerNavigationOrientationHorizontal options:nil];
[self.pageController setDelegate:self];
[self.pageController setDataSource:self];
[[self.pageController view] setFrame:[[self view] bounds]];
NSArray *viewControllers = [NSArray arrayWithObject:[self.pages objectAtIndex:0]];
[self.pageControl setCurrentPage:0];
[self.pageControl addTarget:self action:#selector(changePage:) forControlEvents:UIControlEventValueChanged];
[self.pageController setViewControllers:viewControllers direction:UIPageViewControllerNavigationDirectionForward animated:NO completion:nil];
[self addChildViewController:self.pageController];
[self.view addSubview:self.pageControl];
[[self view] addSubview:[self.pageController view]];
[self.pageController didMoveToParentViewController:self];
[self.view sendSubviewToBack:[self.pageController view]];
}
- (void)didReceiveMemoryWarning
{
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
- (UIViewController *)pageViewController:(UIPageViewController *)pageViewController viewControllerAfterViewController:(UIViewController *)viewController {
NSUInteger currentIndex = [self.pages indexOfObject:viewController]; // get the index of the current view controller on display
[self.pageControl setCurrentPage:self.pageControl.currentPage+1]; // move the pageControl indicator to the next page
// check if we are at the end and decide if we need to present the next viewcontroller
if ( currentIndex < [self.pages count]-1) {
return [self.pages objectAtIndex:currentIndex+1]; // return the next view controller
} else {
return nil; // do nothing
}
}
- (UIViewController *) pageViewController:(UIPageViewController *)pageViewController viewControllerBeforeViewController:(UIViewController *)viewController {
NSUInteger currentIndex = [self.pages indexOfObject:viewController]; // get the index of the current view controller on display
[self.pageControl setCurrentPage:self.pageControl.currentPage-1]; // move the pageControl indicator to the next page
// check if we are at the beginning and decide if we need to present the previous viewcontroller
if ( currentIndex > 0) {
return [self.pages objectAtIndex:currentIndex-1]; // return the previous viewcontroller
} else {
return nil; // do nothing
}
}
- (void)changePage:(id)sender {
UIViewController *visibleViewController = self.pageController.viewControllers[0];
NSUInteger currentIndex = [self.pages indexOfObject:visibleViewController];
NSArray *viewControllers = [NSArray arrayWithObject:[self.pages objectAtIndex:self.pageControl.currentPage]];
if (self.pageControl.currentPage > currentIndex) {
[self.pageController setViewControllers:viewControllers direction:UIPageViewControllerNavigationDirectionForward animated:NO completion:nil];
} else {
[self.pageController setViewControllers:viewControllers direction:UIPageViewControllerNavigationDirectionReverse animated:NO completion:nil];
}
}
#end
.
PVCContentViewController.h
#import <UIKit/UIKit.h>
#import "PVCPagesViewController.h"
#interface PVCContentViewController : UIPageViewController
#property (weak, nonatomic) IBOutlet UILabel *label1;
#property (weak, nonatomic) IBOutlet UILabel *label2;
#property (weak, nonatomic) IBOutlet UILabel *label3;
-(void)example1;
-(void)example2;
-(void)example3;
#end
And lastly:
PVCContentViewController.m
#import "PVCContentViewController.h"
#interface PVCContentViewController ()
#end
#implementation PVCContentViewController
#synthesize label3,label2,label1;
- (void)viewDidLoad {
[super viewDidLoad];
// Do any additional setup after loading the view.
}
- (void)didReceiveMemoryWarning {
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
/*
#pragma mark - Navigation
// In a storyboard-based application, you will often want to do a little preparation before navigation
- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender {
// Get the new view controller using [segue destinationViewController].
// Pass the selected object to the new view controller.
}
*/
-(void)example1{
label1.text = #"View 1";
label2.text = #"View 1";
label3.text = #"view 1";
}
-(void)example2{
label1.text = #"View 2";
label2.text = #"View 2";
label3.text = #"view 2";
}
-(void)example3{
label1.text = #"View 3";
label2.text = #"View 3";
label3.text = #"view 3";
}
#end
I have borrowed the start source code from here:
https://github.com/hackin247/UIPageViewController
My source code:
https://github.com/4FunAndProfit/UIPageViewControllerHelp
Please let me know if you need anymore info!

Answer 1

Have you tried setting the pageController with the self.pages array directly?
[self.pageController setViewControllers:pages direction:UIPageViewControllerNavigationDirectionForward animated:NO completion:nil];
I don't see the point of creating yet another array(viewControllers). Maybe this is causing issues when trying to get the next page since the pageController only has a single viewController ([self.pages objectAtIndex:0]) but the "data source" says it should have more based on the self.pages.count.