ios uiviewcontroller with collectionview subview not showing cells - ios

Question

I have a uiviewcontroller with a subview which is a uicollection view. My view controller implements all of the collectionview delegates. For some reason some of the cells are black (when i scroll they appear , it seems randomly) My code is:
#import "NewGalleryViewController.h"
#interface MyCell : UICollectionViewCell
#property (nonatomic,strong) UIImageView *imageView;
#end
#implementation MyCell
-(id)initWithFrame:(CGRect)frame
{
self = [super initWithFrame:frame];
NSLog(#"frame = %#\n", NSStringFromCGRect(frame));
if (self)
{
self.imageView = [[UIImageView alloc] initWithFrame:frame];
[self.contentView addSubview:self.imageView];
}
return self;
}
#end
#interface NewGalleryViewController () <UICollectionViewDelegate,UICollectionViewDataSource,UICollectionViewDelegateFlowLayout>
#property (nonatomic,strong) UICollectionView *collectionView;
#end
#implementation NewGalleryViewController
- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
if (self) {
// Custom initialization
}
return self;
}
- (void)viewDidLoad
{
[super viewDidLoad];
// Do any additional setup after loading the view.
UICollectionViewFlowLayout *layout = [[UICollectionViewFlowLayout alloc] init];
[layout setItemSize:CGSizeMake(75, 75)];
self.collectionView = [[UICollectionView alloc] initWithFrame:self.view.bounds collectionViewLayout:layout];
self.collectionView.delegate = self;
self.collectionView.dataSource = self;
[self.collectionView registerClass:[MyCell class] forCellWithReuseIdentifier:#"newcell"];
[self.view addSubview:self.collectionView];
}
- (void)didReceiveMemoryWarning
{
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
- (NSInteger)numberOfSectionsInCollectionView:(UICollectionView *)collectionView
{
return 1;
}
- (NSInteger)collectionView:(UICollectionView *)collectionView numberOfItemsInSection:(NSInteger)section
{
return 100;
}
- (UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath
{
MyCell *cell = [collectionView dequeueReusableCellWithReuseIdentifier:#"newcell" forIndexPath:indexPath];
cell.imageView.image = [UIImage imageNamed:#"114"];
return cell;
}
-(void)collectionView:(UICollectionView *)collectionView didDeselectItemAtIndexPath:(NSIndexPath *)indexPath
{
NSLog(#"%ld",(long)indexPath.row);
}
- (CGSize)collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout*)collectionViewLayout sizeForItemAtIndexPath:(NSIndexPath *)indexPath
{
return CGSizeMake(75,75);
}
- (UIEdgeInsets)collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout*)collectionViewLayout insetForSectionAtIndex:(NSInteger)section
{
return UIEdgeInsetsMake(0, 0, 0, 0);
}
- (CGFloat)collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout*)collectionViewLayout minimumLineSpacingForSectionAtIndex:(NSInteger)section
{
return 10;
}
- (CGFloat)collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout*)collectionViewLayout minimumInteritemSpacingForSectionAtIndex:(NSInteger)section
{
return 0;
}
#end

Answer 1

I fixed your problem
-(id)initWithFrame:(CGRect)frame
{
self = [super initWithFrame:frame];
if (self)
{
self.imageView = [[UIImageView alloc] initWithFrame:self.bounds]; // earlier it was frame
[self.contentView addSubview:self.imageView];
}
return self;
}
While creating the content image view do not use frame of the cell instead of use self.bounds. Iam not sure about the reason. Frame can be different at that time bounds will give the actual values

Answer 2

- (id)initWithFrame:(CGRect)frame
{
self = [super initWithFrame:frame];
if (self) {
// Initialization code
NSArray *arrayOfviews = [[NSBundle mainBundle]loadNibNamed:#"PersonCollectionViewCell" owner:self options:nil];
self = [[arrayOfviews objectAtIndex:0]isKindOfClass:[UICollectionViewCell class]] ? [arrayOfviews objectAtIndex:0] : nil;
}
return self;
}