UICollectionView横向分页

#import <UIKit/UIKit.h>

@interface HCollectionViewCell : UICollectionViewCell
@property(nonatomic,copy)NSString *str;
@end

#import "HCollectionViewCell.h"

@interface HCollectionViewCell()
@property(nonatomic,strong)UILabel *label;
@end

@implementation HCollectionViewCell

-(instancetype)initWithFrame:(CGRect)frame{
    self = [super initWithFrame:frame];
    if(self){
        float width = frame.size.width > frame.size.height ? frame.size.height : frame.size.width;
        
        self.label = [[UILabel alloc]initWithFrame:CGRectMake(0, 0, width, width)];
        self.label.textAlignment = NSTextAlignmentCenter;
        self.label.layer.cornerRadius = width/2;
        self.label.clipsToBounds = YES;
        self.label.backgroundColor = [UIColor redColor];
        self.label.center = self.contentView.center;
        [self.contentView addSubview:self.label];
        
    }
    return self;
}
-(void)setStr:(NSString *)str{
    _str = str;
    if(str == nil){
        self.label.text = @"";
        self.label.hidden = YES;
    }else{
        self.label.text = str;
        self.label.hidden = NO;
    }
    
}
@end

#import "HCollecitonViewViewController.h"
#import "HCollectionViewCell.h"
@interface HCollecitonViewViewController ()<UICollectionViewDelegate,UICollectionViewDataSource>
@property(nonatomic,strong)UICollectionView *collecitonView;
@property(nonatomic,strong)NSMutableArray *dataArr;
@property(nonatomic,strong)UIPageControl *pageControl;
@end

@implementation HCollecitonViewViewController
#define Identifier @"cell"
#define HCount 4//横向排列个数
-(NSMutableArray *)dataArr{
    if(!_dataArr){
        _dataArr = [NSMutableArray array];
        for(int i=0;i<13;i++){
            [_dataArr addObject:[NSString stringWithFormat:@"%d",i]];
        }
    }
    return _dataArr;
}

- (void)viewDidLoad {
    [super viewDidLoad];
     UICollectionViewFlowLayout *layout = [[UICollectionViewFlowLayout alloc] init];
    layout.minimumLineSpacing = 0;
    layout.itemSize = CGSizeMake(CGRectGetWidth(self.view.frame)/4.0f, 70);
    //横向滚动
    layout.scrollDirection = UICollectionViewScrollDirectionHorizontal;
    self.collecitonView = [[UICollectionView alloc]initWithFrame:CGRectMake(0, 100, CGRectGetWidth(self.view.frame), 70) collectionViewLayout:layout];
    self.collecitonView.backgroundColor = [UIColor whiteColor];
    self.collecitonView.delegate = self;
    self.collecitonView.dataSource = self;
    [self.view addSubview:self.collecitonView];
    [self.collecitonView registerClass:[HCollectionViewCell class] forCellWithReuseIdentifier:Identifier];
    self.collecitonView.pagingEnabled = YES;
    
    
    self.pageControl = [[UIPageControl alloc]initWithFrame:CGRectMake(0, CGRectGetMaxY(self.collecitonView.frame), CGRectGetWidth(self.view.frame), 20)];
    self.pageControl.numberOfPages =  (self.dataArr.count+HCount-1)/HCount;
    self.pageControl.pageIndicatorTintColor = [UIColor grayColor];
    self.pageControl.currentPageIndicatorTintColor = [UIColor redColor];
    [self.view addSubview:self.pageControl];
    
    
}
#pragma mark UICollectionViewDelegate,UICollectionViewDataSource
-(NSInteger)collectionView:(UICollectionView *)collectionView numberOfItemsInSection:(NSInteger)section{
   
    return  self.pageControl.numberOfPages * HCount ;

}
- (__kindof UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath{
    HCollectionViewCell *cell = [collectionView dequeueReusableCellWithReuseIdentifier:Identifier forIndexPath:indexPath];
    if(indexPath.row < self.dataArr.count){
        cell.str = self.dataArr[indexPath.row];
    }else{
        cell.str = nil;
    }
    
    return cell;
}
-(void)scrollViewDidEndDecelerating:(UIScrollView *)scrollView{
    int x = scrollView.contentOffset.x/CGRectGetWidth(self.collecitonView.frame);
    self.pageControl.currentPage = x;
}
@end