Presenting ImagePicker modally over a CollectionViewController

#import "CameraViewController.h"
#import <MobileCoreServices/UTCoreTypes.h>
#import "HomeViewController.h"
#import "PhotoCell.h"

@interface CameraViewController ()

@end

@implementation CameraViewController



- (void)viewDidLoad
{
    [super viewDidLoad];
    UIStoryboard *storyBoard = [UIStoryboard storyboardWithName:@"MainStoryboard" bundle:nil];
    CameraViewController *vc = (CameraViewController *) [storyBoard instantiateViewControllerWithIdentifier:@"Camera"];

    [vc initWithCoder:nil];
    self.collectionView.backgroundColor = [UIColor whiteColor];

    [self.collectionView registerClass:[PhotoCell class] forCellWithReuseIdentifier:@"camera"];

}

- (void) viewWillAppear:(BOOL)animated {

    [super viewWillAppear:animated];

    self.imagePicker = [[UIImagePickerController alloc] init];
    self.imagePicker.delegate = self;
    self.imagePicker.allowsEditing = NO;

    if ([UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypeCamera]) {
        self.imagePicker.sourceType = UIImagePickerControllerSourceTypeCamera;
    }
    else {
        self.imagePicker.sourceType = UIImagePickerControllerSourceTypePhotoLibrary;
    }

    self.imagePicker.mediaTypes = [UIImagePickerController availableMediaTypesForSourceType:self.imagePicker.sourceType];

   [self presentViewController:self.imagePicker animated:NO completion:nil];

}


-(NSInteger)collectionView:(UICollectionView *)collectionView numberOfItemsInSection:(NSInteger)section {
    return 1;
}

- (UICollectionViewCell *) collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath {
    static NSString *CellIdentifier = @"camera";

    UICollectionViewCell *cell = [collectionView dequeueReusableCellWithReuseIdentifier:CellIdentifier forIndexPath:indexPath];


    cell.backgroundColor = [UIColor lightGrayColor];

    return cell;
}

- (id)initWithCoder:(NSCoder*)coder
{

    UICollectionViewFlowLayout *layout = [[UICollectionViewFlowLayout alloc] init];



    layout.itemSize = CGSizeMake(306.0, 306.0);
    layout.minimumInteritemSpacing = 150.0;
    layout.minimumLineSpacing = 50.0;


    return (self = [super initWithCollectionViewLayout:layout]);
}



#pragma mark - ImagePickerController Delegate

-(void) imagePickerControllerDidCancel:(UIImagePickerController *)picker {
    [self dismissViewControllerAnimated:NO completion:nil];

    [self.tabBarController setSelectedIndex:0];
}

-(void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info {
    NSString *mediaType = [info objectForKey:UIImagePickerControllerMediaType];
    if ([mediaType isEqualToString:(NSString *)kUTTypeImage]) {
        //a photo was taken/selected!
        self.image = [info objectForKey:UIImagePickerControllerOriginalImage];
        if (self.imagePicker.sourceType == UIImagePickerControllerSourceTypeCamera) {
            // save the image
            UIImageWriteToSavedPhotosAlbum(self.image, nil, nil, nil);
        }
        [self dismissViewControllerAnimated:YES completion:nil];
    }
}

@end