项目介绍：

    #import <UIKit/UIKit.h>  
    #import "BaseViewController.h"  
    @interface BaseCollectionViewController : BaseViewController  
    //页数索引  
    @property (nonatomic,assign) NSInteger pageNO;  
    //每页显示多少条  
    @property (nonatomic,assign) NSInteger pageSize;  
    //数据源  
    @property (nonatomic,strong) NSMutableArray *dataArray;  
    //开启头部刷新  
    @property (nonatomic,assign) BOOL  isOpenHeaderRefresh;  
    //开启脚部刷新  
    @property (nonatomic,assign) BOOL  isOpenFooterRefresh;  
      
    @property(strong,nonatomic)UICollectionView * collectionView;  
    @property(strong,nonatomic)UICollectionViewFlowLayout *flowLayout;  
      
    //头部刷新请求 (子类需要重写)  
    - (void)headerRequestWithData;  
      
    - (void)footerRequestWithData;  
    @end  

#import "BaseCollectionViewController.h"  
#define MJRandomColor [UIColor colorWithRed:arc4random_uniform(255)/255.0 green:arc4random_uniform(255)/255.0 blue:arc4random_uniform(255)/255.0 alpha:1]  
@interface BaseCollectionViewController ()<UICollectionViewDelegate,UICollectionViewDataSource>  
  
  
@end  
  
@implementation BaseCollectionViewController  
static NSString * reuseIdentifier = @"hehe";  
- (UICollectionViewFlowLayout *)flowLayout{  
    if (!_flowLayout) {  
        UICollectionViewFlowLayout * flowLayout = [[UICollectionViewFlowLayout alloc]init];  
        //设置流水布局的大小  
        CGFloat cellWith =([UIScreen mainScreen].bounds.size.width)/3.0;  
        flowLayout.itemSize = CGSizeMake(cellWith , cellWith);  
        flowLayout.minimumInteritemSpacing = 0;  
        flowLayout.minimumLineSpacing = 0;  
        _flowLayout = flowLayout;  
    }  
    return _flowLayout;  
}  
- (UICollectionView *)collectionView{  
    if (!_collectionView) {  
        UICollectionView * collectionView = [[UICollectionView alloc]initWithFrame:CGRectMake(0, 0, kScreenWidth, kScreenHeight) collectionViewLayout:self.flowLayout];  
        /**
         *默认是YES ,设置为NO之后就不在滚动,不会出现上下拉刷新
         */  
        collectionView.scrollEnabled = YES;  
        collectionView.translatesAutoresizingMaskIntoConstraints = YES;  
        [self.view addSubview:collectionView];  
        collectionView.collectionViewLayout = self.flowLayout;  
        collectionView.delegate =self;  
        collectionView.dataSource =self;  
        collectionView.backgroundColor = [UIColor clearColor];  
        [collectionView registerClass:[UICollectionViewCell class] forCellWithReuseIdentifier:reuseIdentifier];  
        _collectionView = collectionView;  
    }  
    return _collectionView;  
}  
  
- (void)viewDidLoad {  
    [super viewDidLoad];  
    // Do any additional setup after loading the view.  
    self.pageNO = 1;  
    self.pageSize = 15;  
    [self.view addSubview:self.collectionView];  
  
}  
- (void)setIsOpenHeaderRefresh:(BOOL)isOpenHeaderRefresh{  
    if (_isOpenHeaderRefresh != isOpenHeaderRefresh) {  
        _isOpenHeaderRefresh = isOpenHeaderRefresh;  
        WeakSelf(self);  
        if (isOpenHeaderRefresh) {  
            self.collectionView.mj_header= [MJRefreshNormalHeader headerWithRefreshingBlock:^{  
                // 增加5条假数据  
                weakSelf.pageNO = 1;  
                [weakSelf headerRequestWithData];  
                // 结束刷新  
                [weakSelf.collectionView.mj_header endRefreshing];  
                  
            }];  
            [self.collectionView.mj_header beginRefreshing];  
         
        }  
    }  
}  
//下拉刷新  
- (void)setIsOpenFooterRefresh:(BOOL)isOpenFooterRefresh{  
    if (_isOpenFooterRefresh != isOpenFooterRefresh) {  
        _isOpenFooterRefresh = isOpenFooterRefresh;  
        WeakSelf(self);  
        if (isOpenFooterRefresh) {  
            // 上拉刷新  
            self.collectionView.mj_footer = [MJRefreshBackNormalFooter footerWithRefreshingBlock:^{  
                // 增加5条假数据  
                weakSelf.pageNO ++;  
                [weakSelf footerRequestWithData];  
                // 结束刷新  
                [weakSelf.collectionView.mj_footer endRefreshing];  
            }];  
        }  
    }  
}  
//头部刷新请求 (子类需要重写)  
- (void)headerRequestWithData{  
      
}  
//脚部刷新  
- (void)footerRequestWithData{  
      
}  
  
- (NSInteger)collectionView:(UICollectionView *)collectionView numberOfItemsInSection:(NSInteger)section{  
    return self.dataArray.count;  
}  
- (UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath {  
      
    UICollectionViewCell *cell =[collectionView dequeueReusableCellWithReuseIdentifier:reuseIdentifier forIndexPath:indexPath];  
    cell.contentView.backgroundColor = self.dataArray[indexPath.row];  
      
    return cell;  
}  
  
  
//- (UIEdgeInsets )collectionView:( UICollectionView *)collectionView layout:( UICollectionViewLayout *)collectionViewLayout insetForSectionAtIndex:( NSInteger )section  
//  
//{  
//    return UIEdgeInsetsMake (10,10,0,10);  
//}  
- (NSMutableArray *)dataArray{  
    if (!_dataArray) {  
        _dataArray = [NSMutableArray array];  
    }  
    return _dataArray;  
}  
  
@end  

LHExtions

Hello iOS_Hy根据MJRefresh 再度封装CollectionViewController 和tableViewController 也有封装好的viewController 大家可以直接用 里面的PCH也不错哦 还有网络加载工具的二次封装.

demo地址:自己花时间写了一上午,也不容易,你懂得