convert parse to image in nsarray - ios

Question

Can anyone please help me here? scenario is:
I have a view controller, page view controller, and a content for page view controller.
The app is to initially load 3 pages of images, and on the 3rd page a button will then appear. if pressed it'll be directed to the main menu page.
all images are loaded from parse.
I previously had a separate program for page view controller and another for parse image loader, executed perfectly. however when I combine both together it fails. based on what I understand is that, images from parse are stored as NSData. however, in my page view controller, i'm using index to load the images. I tried converting NSData to NSArray using KeyedAchiver however it couldn't work.
I also notice that my image loaded from parse doesn't come in the sequence I want. So, if possible, please help to advise on this!
below are the codes. thanks in advance!
//***********************view controller
#import "ViewController.h"
#import <parse/parse.h>
#interface ViewController ()
#end
#implementation ViewController
#synthesize parseImageData,pageImages; //UIImage, NSData
- (void)viewDidLoad
{
[super viewDidLoad];
// Create the data model
// _pageTitles = #[#"New York Cheese", #"Vanilla Cake", #"Green Tea Cake", #"Choc Indulgence"];
// _pageImages = #[#"pic1.png", #"pic2.png", #"pic3.png", #"pic4.png"];
_pageTitles = #[#"New York Cheese", #"Vanilla Cake"];
// Create page view controller
self.pageViewController = [self.storyboard instantiateViewControllerWithIdentifier:#"PageViewController"];
self.pageViewController.dataSource = self;
PageContentViewController *startingViewController = [self viewControllerAtIndex:0];
NSArray *viewControllers = #[startingViewController];
[self.pageViewController setViewControllers:viewControllers direction:UIPageViewControllerNavigationDirectionForward animated:NO completion:nil];
// Change the size of page view controller
self.pageViewController.view.frame = CGRectMake(0, 0, self.view.frame.size.width, self.view.frame.size.height - 30);
[self addChildViewController:_pageViewController];
[self.view addSubview:_pageViewController.view];
[self.pageViewController didMoveToParentViewController:self];
NSLog(#"viewcontroller.m viewdidload complete");
}
- (PageContentViewController *)viewControllerAtIndex:(NSUInteger)index
{
if (([self.pageTitles count] == 0) || (index >= [self.pageTitles count])) {
NSLog(#"out of range!");
return nil;
}
NSLog(#"viewcontroller.m update index");
//add my own parse program
PFQuery *query = [PFQuery queryWithClassName:#"Pictures"];
[query findObjectsInBackgroundWithBlock:^(NSArray *objects, NSError *error) {
if (!error){
NSLog(#"picture queried");
NSLog(#"array %#",objects);
NSArray *imageFilesArray = [[NSArray alloc]initWithArray:objects];
PFObject *imageObject = [imageFilesArray objectAtIndex:index];
PFFile *imageFile = [imageObject objectForKey:#"imageFile"];
// scrolling.hidden = NO;
// [scrolling startAnimating];
NSLog(#"pffile %#",imageFile);
[imageFile getDataInBackgroundWithBlock:^(NSData *data, NSError *error) {
if(!error){
// scrolling.hidden = YES;
//imageView.image = [UIImage imageWithData:data];
pageImages = data;
parseImageData = [UIImage imageWithData:data];
NSLog(#"nsdata translated %#",parseImageData);
// pageContentViewController.imageFile = data;
}
}];
}}];
// Create a new view controller and pass suitable data.
PageContentViewController *pageContentViewController = [self.storyboard instantiateViewControllerWithIdentifier:#"PageContentViewController"];
// pageContentViewController.imageFile = self.pageImages[index];
pageContentViewController.titleText = self.pageTitles[index];
NSLog(#"self.pagetitles[index]");
//pageContentViewController.imageFile = parseImageData;
NSArray *pageImagesArray = [NSKeyedArchiver archivedDataWithRootObject:pageImages];
pageContentViewController.imageFile = pageImagesArray[index];
NSLog(#"pagecontentviewcontroller.imagefile is %#",pageContentViewController.imageFile);
NSLog(#"self.parseImageData %lu",(unsigned long)index);
pageContentViewController.pageIndex = index;
return pageContentViewController;
}
//*****************PAGE CONTENT CONTROLLER PART
#import "PageContentViewController.h"
#import <parse/parse.h>
#interface PageContentViewController ()
#end
#implementation PageContentViewController
#synthesize imageFile,titleText,backgroundImageView; //NSData, NSString, IBOutlet UIImage
- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
if (self) {
// Custom initialization
}
return self;
}
- (void)viewDidLoad
{
[super viewDidLoad];
//self.backgroundImageView.image = [UIImage imageWithData:imageFile];
backgroundImageView.image = [UIImage imageWithData:imageFile];
self.titleLabel.text = self.titleText;
NSLog(#"Image supposed be loaded...%#",imageFile);
NSLog(#"title supposed be loaded...%#",titleText);
}