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iOS

Posted by Jack Ryder
Jack Ryder
7,286 Points

how to initialise view controller in code and use interface builder

in interface builder i set up a tabBarController which is my root view controller. However, i am following the photo bombers tutorial code where I change the init method to set up my collection view in one of my tabs and it sets this to the rootviewcontroller resetting all my work in interface builder. is there a way of initialising the collectionviewcontroller without setting it as my root view controller and maintaining my tab bar?

thanks!

Jack Ryder
Jack Ryder
7,286 Points

any ideas Sam Soffes ?

2 Answers

Robert Bojor
PLUS
Robert Bojor
Courses Plus Student 29,439 Points
Robert Bojor
Robert Bojor
Courses Plus Student 29,439 Points

I've managed to set up a CollectionViewController as one of the tabs like so:

FirstViewController.h

#import <UIKit/UIKit.h>
@interface FirstViewController : UICollectionViewController
@end

FirstViewController.m

#import "FirstViewController.h"
@interface FirstViewController ()
@end

@implementation FirstViewController
- (instancetype)init {
    UICollectionViewFlowLayout *layout = [[UICollectionViewFlowLayout alloc] init];
    layout.itemSize = CGSizeMake(106.0, 106.0);
    layout.minimumInteritemSpacing = 1.0;
    layout.minimumLineSpacing = 1.0;
    return [self initWithCollectionViewLayout:layout];
}

- (void)viewDidLoad {
    [super viewDidLoad];
    [self.collectionView registerClass:[UICollectionViewCell class] forCellWithReuseIdentifier:@"photo"];
    self.collectionView.backgroundColor = [UIColor whiteColor];
    self.title = @"Photo Bombers";
}

- (NSInteger)collectionView:(UICollectionView *)collectionView numberOfItemsInSection:(NSInteger)section {
    return 10;
}

- (UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath {
    UICollectionViewCell *cell = [collectionView dequeueReusableCellWithReuseIdentifier:@"photo" forIndexPath:indexPath];
    cell.backgroundColor = [UIColor grayColor];
    return cell;
}

@end

Works like a charm. You still need to tweak the spacing on top though.

Jack Ryder
Jack Ryder
7,286 Points
Jack Ryder
Jack Ryder
7,286 Points

I ended up alerting the method initWithCoder and putting the layout constraints in there and then calling it:

UIStoryboard *storyBoard = [UIStoryboard storyboardWithName:@"MainStoryboard" bundle:nil];
    HomeViewController *vc = (HomeViewController *) [storyBoard instantiateViewControllerWithIdentifier:@"Home"];

    [vc initWithCoder:nil];

thanks for the help though!