objective-c : using custom CollectionViewCell

snippet.m

//using custom CollectionViewCell


//TWPhotoCollectionViewCell.h

@interface TWPhotoCollectionViewCell : UICollectionViewCell

@property (strong, nonatomic) UIImageView *imageView;

@end


//TWPhotoCollectionViewCell.m

#import "TWPhotoCollectionViewCell.h"

#define IMAGEVIEW_BORDER_LENGTH 5

@implementation TWPhotoCollectionViewCell

//in case making TWPhotoCollectionViewCell in code
- (id)initWithFrame:(CGRect)frame
{
    if (debug==1) {NSLog(@"Running %@ '%@'", self.class, NSStringFromSelector(_cmd));}
    self = [super initWithFrame:frame];
    if (self) {
        // Initialization code
        [self setup];
    }
    return self;
}


//cause making TWPhotoCollectionViewCell in storyboard
- (id)initWithCoder:(NSCoder *)aDecoder
{
    if (debug==1) {NSLog(@"Running %@ '%@'", self.class, NSStringFromSelector(_cmd));}
    
    self = [super initWithCoder:aDecoder];
    
    if (self) {
        // Initialization code
        [self setup];
    }
    return self;
}


- (void)setup
{
    if (debug==1) {NSLog(@"Running %@ '%@'", self.class, NSStringFromSelector(_cmd));}
    
    self.imageView = [[UIImageView alloc] initWithFrame:CGRectInset(self.bounds, IMAGEVIEW_BORDER_LENGTH, IMAGEVIEW_BORDER_LENGTH)];
    [self.contentView addSubview:self.imageView];
    
}

@end


//TWPhotosCollectionViewController.m

#import "TWPhotosCollectionViewController.h"
#import "TWPhotoCollectionViewCell.h" //커스텀 컬렉션 뷰 셀

@implementation TWPhotosCollectionViewController

#pragma mark - UICollectionView 데이터 소스

- (UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath
{
    if (debug==1) {NSLog(@"Running %@ '%@'", self.class, NSStringFromSelector(_cmd));}
    
    static NSString *CellIdentifier = @"Photo Cell";
    
    //커스텀 컬렉션 뷰 셀 사용
    TWPhotoCollectionViewCell *cell = [collectionView dequeueReusableCellWithReuseIdentifier:CellIdentifier
                                                                           forIndexPath:indexPath];
    cell.backgroundColor = [UIColor whiteColor];
    cell.imageView.image = [UIImage imageNamed:@"speaker.jpg"];
    
    return cell;
}


- (NSInteger)collectionView:(UICollectionView *)collectionView numberOfItemsInSection:(NSInteger)section
{
    if (debug==1) {NSLog(@"Running %@ '%@'", self.class, NSStringFromSelector(_cmd));}
    
    return 5;
}

@end