How to initialize UICollectionViewCell programmatically without Nib - ios

Question

I decided to opt out of using a Xib to generate my custom UICollectionViewCell (StoneCell), so I've been struggling with how to go about properly initializing it programmatically.
I implemented:
- (CGSize)collectionView:(UICollectionView *)collectionView
layout:(UICollectionViewLayout *)collectionViewLayout
sizeForItemAtIndexPath:(NSIndexPath *)indexPath {
CGSize size = [MainScreen screen];
CGFloat width = size.width;
CGFloat item = (width*60)/320;
return CGSizeMake(item, item);
}
as well as:
[self.collectionView registerClass:[StoneCell class] forCellWithReuseIdentifier:#"stoneCell"];
in my UICollectionView controller.
In my StoneCell.m, I tried the following:
-(id)initWithFrame:(CGRect)frame {
self = [super initWithFrame:frame];
if (self) {
StoneCell* stone = [[StoneCell alloc] initWithFrame:frame];
self = stone;
}
return self;
}
but to no avail. When I build and run, I crash on self = [super initWithFrame:frame]; When I check the value of frame, it's correctly set at {{0,0},{70,70}} which is what it should be on the 6s. However, the object stone (as well as self) are both reported as nil.
Clearly this is not correct, so I wanted to know how to initialize the cell properly.
I am also properly dequeuing the cell in:
-(UICollectionViewCell *)collectionView:(UICollectionView *)collectionView
cellForItemAtIndexPath:(NSIndexPath *)indexPath
so that's taken care of.

Answer 1

Your initializer should be
- (instancetype)initWithFrame:(CGRect)frame {
self = [super initWithFrame:frame];
return self;
}
With your original implementation
-(id)initWithFrame:(CGRect)frame {
self = [super initWithFrame:frame];
if (self) {
StoneCell* stone = [[StoneCell alloc] initWithFrame:frame];
self = stone;
}
return self;
}
you have an infinite recursion of initWithFrame.

Answer 2

// In AMAImageViewCell.h
#import <UIKit/UIKit.h>
#interface AMAImageViewCell : UICollectionViewCell
#property (strong, readonly, nonatomic) UIImageView *imageView;
#end
// In AMAImageViewCell.m
#implementation AMAImageViewCell
- (id)initWithFrame:(CGRect)frame
{
self = [super initWithFrame:frame];
if (self) {
_imageView = [[UIImageView alloc] initWithFrame:self.contentView.bounds];
_imageView.autoresizingMask = UIViewAutoresizingFlexibleHeight | UIViewAutoresizingFlexibleWidth;
_imageView.clipsToBounds = YES;
_imageView.contentMode = UIViewContentModeScaleAspectFill;
_imageView.layer.cornerRadius = 0.0;
[self.contentView addSubview:_imageView];
}
return self;
}
#end
/******In the class where you have to use **********/
[self.collectionView registerClass:[AMAImageViewCell class] forCellWithReuseIdentifier:ImageCellIdentifier];
// In cellForItemAtIndexPath
AMAImageViewCell *cell = [collectionViewLocal dequeueReusableCellWithReuseIdentifier:ImageCellIdentifier
forIndexPath:indexPath];