UIPageViewController blanking page
- by CrazyEoin
I've been trying to use the UIPageViewController to display 3 different nibs for a few days on and off now and have almost got it working. I still have one weird bug that I cant figure out.
Basically the app starts, I can scroll between the 3 pages one after another with out any problems, eg:
Page1-Page2-Page3
and then back to the start:
Page3-Page2-Page1.
No Problems. The issue is that if I scroll, for example from Page3-Page2, then BACK to Page3, Page3 Dissappears when it snaps into place. If I scroll to where a forth page would be, then I get Page3. Here is the code relevant to the UIPageViewController, the nibs and the delegate methods for the UIPageViewController:
- (void)viewDidLoad{
[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.
self.pageViewController = [[UIPageViewController alloc] initWithTransitionStyle:UIPageViewControllerTransitionStyleScroll navigationOrientation:UIPageViewControllerNavigationOrientationHorizontal options:nil];
self.pageViewController.delegate = self;
[[self.pageViewController view] setFrame:[[self view] bounds]];
indexTest = 0;
Page1 *p1 = [[Page1 alloc]initWithNibName:@"Page1" bundle:nil];
p1.view.tag = 1;
Page2 *p2 = [[Page2 alloc]initWithNibName:@"Page2" bundle:nil];
p2.view.tag = 2;
Page3 *p3 = [[Page3 alloc]initWithNibName:@"Page3" bundle:nil];
p3.view.tag = 3;
NSArray *arr = [[NSArray alloc] initWithObjects:p1,nil];
viewControllers = [[NSMutableArray alloc] initWithObjects:p1,p2,p3, nil];
[self.pageViewController setViewControllers:arr direction:UIPageViewControllerNavigationDirectionForward animated:NO completion:nil];
self.pageViewController.dataSource = self;
[self addChildViewController:self.pageViewController];
[[self view] addSubview:[self.pageViewController view]];
[self.pageViewController didMoveToParentViewController:self];
self.view.gestureRecognizers = self.pageViewController.gestureRecognizers;
}
#pragma mark - page view controller stuff
- (UIViewController *)pageViewController:(UIPageViewController *)pageViewController viewControllerBeforeViewController:(UIViewController *)viewController {
if (indexTest > 0) {
switch (indexTest) {
case 1:{
NSLog(@"NO page is BEFORE current page");
break;
}
case 2:{
NSLog(@"Page BEFORE is Page: %@", [NSString stringWithFormat:@"%@",[viewControllers objectAtIndex:0] ] );
indexTest--;
return [viewControllers objectAtIndex:0];
break;
}
default:{
NSLog(@"PROBLEM in viewBEFORE, indexTest = %d!!!!", indexTest);
break;
}
}
}
return nil;
}
- (UIViewController *)pageViewController:(UIPageViewController *)pageViewController viewControllerAfterViewController:(UIViewController *)viewController {
if (indexTest < NUM_OF_PAGES) {
switch (indexTest) {
case 0:{
NSLog(@"Page AFTER is Page: %@", [NSString stringWithFormat:@"%@",[viewControllers objectAtIndex:1] ] );
indexTest++;
return [viewControllers objectAtIndex:1];
break;
}
case 1:{
NSLog(@"Page AFTER is Page: %@", [NSString stringWithFormat:@"%@",[viewControllers objectAtIndex:2] ] );
indexTest++;
return [viewControllers objectAtIndex:2];
break;
}
case 2:{
NSLog(@"No pages AFTER this current page %d", indexTest);
break;
}
default:{
NSLog(@"PROBLEM in viewAFTER, indexTest = %d!!!!", indexTest);
break;
}
}
}
return nil;
}
Finally the page index dots code
#pragma mark - dot controller
- (NSInteger)presentationCountForPageViewController:(UIPageViewController *)pageViewController {
// The number of items reflected in the page indicator.
return NUM_OF_PAGES;
}
- (NSInteger)presentationIndexForPageViewController:(UIPageViewController *)pageViewController {
// The selected item reflected in the page indicator.
return 0;
}
Any and all help is much appreciated, I think I'm just doing something silly that I cant see as I'm so close to it fully working. If anythings not clear or I haven't give enough information please let me know and I'll answer it as best as I can.
Thanks
