Why don't I see UIPageControl? - ios

Question

I'm following these instructions per the ios docs on UIPageViewController and UIPageControl:
A page indicator will be visible if both methods are implemented, transition style is 'UIPageViewControllerTransitionStyleScroll', and navigation orientation is 'UIPageViewControllerNavigationOrientationHorizontal'. Both methods are called in response to a 'setViewControllers:...' call, but the presentation index is updated automatically in the case of gesture-driven navigation.
- (NSInteger)presentationCountForPageViewController:(UIPageViewController *)pageViewController
- (NSInteger)presentationIndexForPageViewController:(UIPageViewController *)pageViewController
So I have implemented them as follows, inside a UIViewController wrapper class:
Here is the initialization:
#interface PageViewWrapperViewController : UIViewController <UIPageViewControllerDelegate, UIPageViewControllerDataSource>
#property (strong, nonatomic) UIPageViewController *pageController;
#property (assign, nonatomic) NSInteger index;
#property (strong, nonatomic) UILabel *screenNumber;
#property UIPageControl *childPageControl;
#end
- (void)viewDidLoad {
[super viewDidLoad];
self.index = 0;
self.pageController = [[UIPageViewController alloc] initWithTransitionStyle:UIPageViewControllerTransitionStyleScroll navigationOrientation:UIPageViewControllerNavigationOrientationHorizontal options:nil];
self.pageController.dataSource = self;
self.pageController.delegate = self;
[self.pageController.view setFrame:[[self view] bounds]] ;
UIViewController *initialViewController = [self viewControllerAtIndex:0];
NSArray *viewControllers = [NSArray arrayWithObject:initialViewController];
[self.pageController setViewControllers:viewControllers direction:UIPageViewControllerNavigationDirectionForward animated:NO completion:nil];
[self addChildViewController:self.pageController];
[[self view] addSubview:[self.pageController view]];
//[self.pageController didMoveToParentViewController: self];
self.childPageControl = [[UIPageControl alloc] init];
// self.childPageControl = [self getPageControlForPageViewController:self.pageController];
self.childPageControl.alpha = .5;
[self.view bringSubviewToFront:self.childPageControl];
}
Here are the required methods for the UIPageControl:
- (NSInteger)presentationCountForPageViewController:(UIPageViewController *)pageViewController
{
return 5;
}
-(NSInteger)presentationIndexForPageViewController:(UIPageViewController *)pageViewController
{
return self.index;
}
And here is where I give the PageController the individual view controllers:
- (UIViewController *)viewControllerAtIndex:(NSUInteger)index{
if(index==0)
{
//JudgeViewController *next1 = [[JudgeViewController alloc] init];
JudgeTutorViewController *next1 = [[JudgeTutorViewController alloc] init];
next1.view.userInteractionEnabled = NO;
return next1;
}
else if(index==1)
{
FollowTableViewController *next1 = [[FollowTableViewController alloc] init];
next1.view.userInteractionEnabled = NO;
next1.typeDisplay = 1;
return next1;
}
else if (index==2)
{
StatTutorViewController *next1 = [[StatTutorViewController
alloc] init];
next1.view.userInteractionEnabled = NO;
next1.user = [[UserObject userUnique] copyUser].name;
return next1;
}
else if (index==3)
{
MenuTutorViewController *next1 = [[MenuTutorViewController
alloc] init];
next1.view.userInteractionEnabled = NO;
return next1;
}
else if(index ==4)
{
BuzzTutorViewController *next1 = [[BuzzTutorViewController alloc] init];
next1.view.userInteractionEnabled = NO;
return next1;
}
self.index = index;
return nil;
}
The UIPageViewController itself is working fine, but I don't see the UIPageControl. What is missing from my code?
Thank you for any suggestions.

Answer 1

Actually, neither of these answers is what the problem is. In fact, I didn't change my code but once I flushed my build settings a few times that did the trick. Thank you all!

Answer 2

self.childPageControl = [[UIPageControl alloc] init];
// self.childPageControl = [self getPageControlForPageViewController:self.pageController];
self.childPageControl.alpha = .5;
[self.view bringSubviewToFront:self.childPageControl];
At no point are you adding the page control as a subview. The view debugger in Xcode is a great way to spot missing UI elements like this.