使用纯代码定义UICollectionView和自定义UICollectionViewCell

1.自定义UICollectionView

2.实现<UICollectionViewDataSource,UICollectionViewDelegateFlowLayout,UICollectionViewDelegate>协议

 UICollectionViewFlowLayout *flowLayout=[[UICollectionViewFlowLayout alloc] init];
            flowLayout.itemSize=CGSizeMake(60,60);
            [flowLayout setScrollDirection:UICollectionViewScrollDirectionHorizontal];

            UICollectionView *collectionView =[[UICollectionView alloc]initWithFrame:CGRectMake(0, 40, self.view.frame.size.width, self.view.frame.size.height) collectionViewLayout:flowLayout];

            [collectionView registerClass:[customCollectCell class]
                    forCellWithReuseIdentifier:@"myIdentifier"];
            [collectionView setBackgroundColor:[UIColor whiteColor]];
            collectionView.dataSource=self;
            collectionView.delegate=self;

            [myControl addSubview:collectionView];

3.自定义cell

-(id)initWithFrame:(CGRect)frame{
    self=[super initWithFrame:frame];
    if (self) {
        UIView *view=[[UIView alloc]init];
        [view setFrame:CGRectMake(5, 0, 60, 60)];
        view.layer.cornerRadius=4;
        view.layer.masksToBounds=YES;　　　　　//item被选中时的背景色，可以不用设置
        [view setBackgroundColor:[UIColor lightGrayColor]];
        self.selectedBackgroundView=view;
        float offset_x=5;
        float offset_y=0;
        {
            _myimageView=[[UIImageView alloc]initWithFrame:CGRectMake(15, offset_y, 60,60)];
            [_myimageView setContentMode:UIViewContentModeScaleAspectFill];
            [self addSubview:_myimageView];
            _myLabel=[[UILabel alloc]initWithFrame:CGRectMake(offset_x, offset_y+70, 60, 20)];
            [_myLabel setTextAlignment:NSTextAlignmentCenter];
            [_myLabel setFont:[UIFont systemFontOfSize:12]];
            [_myLabel setTextColor:[UIColor redColor]];
            [self addSubview:_myLabel];

        }

    }
        return self;
}