ios UITableView封装之下拉-上提-图片异步加载 .

写在前面

做过移动端开发的人都知道，列表控件是最常用的控件之一。iOS里的列表控件是UITableView，其实Apple的开发人员对于UITableView的设计已经够好的了(简单易用，扩展性非常强等等)。

但对于展示逻辑单一的移动端系统软件，你还是能感觉到有些繁琐(或许是程序员天生就有些懒惰的毛病吧)。

来看看它到底繁琐在哪儿了。首先，它的使用频率太高了；第二，它通常不是只呈现一下数据就完事了，一般都会跟随下拉刷新、上提加载更多功能，当然通常还要跟网络下载数据、图片打交道；第三，MVC模式是ios开发的惯用模式，随之而来的是一大堆协议的实现(无论你是再写一次也好，拷贝也罢，反正做这些工作都让人觉得索然无味)。

冲着这些，今天就把UITableView常见的使用模式封装了一下。具体做了以下几件事：

1、  内嵌了下拉刷新(EGORefreshTableHeaderView)、上提加载更多(LoadMoreTableFooterView)

2、  内置实现了UITableViewDataSource、UITableViewDelegate这两个通常必须实现的协议，对于自实现的逻辑以Block的形式对客户代码开放

3、  内置实现了1中提到的两个组件的回调协议，同上，自实现的逻辑以Block的形式对外开放

4、  内置实现了EGORefreshTableHeaderView、LoadMoreTableFooterView与UITableView交互必须实现的UIScrollViewDelegate协议

5、  内置实现了异步图片下载(可选)

 

你可以到我的Github上，查看源码。称它为ELTableViewController是取了EGORefreshTableHeaderView以及LoadMoreTableFooterView的首字母。

这份代码中包含了一个示例程序以及三个必备组件：

1、  EGORefreshTableHeaderView

2、  LoadMoreTableFooterView(修改版，原版不能适应任何尺寸的高度)

3、  Apple官方提供的异步下载UITableView中的图片的示例组件(IconDownLoader)，这个只适用于下载类似于社交网络中的用户头像，不建议使用它来下载那些大图片，因为它甚至都没有缓存(如果图片很大，推荐使用SDImage)

代码解读

它已经内置实现了这些协议，所以在你使用它的时候，无需设置和实现。

@interface ELTableViewController : UIViewController
<
UITableViewDelegate,
UITableViewDataSource,
EGORefreshTableHeaderDelegate,
LoadMoreTableFooterDelegate,
IconDownloaderDelegate
>

@interface ELTableViewController : UIViewController
<
UITableViewDelegate,
UITableViewDataSource,
EGORefreshTableHeaderDelegate,
LoadMoreTableFooterDelegate,
IconDownloaderDelegate
>

对于不断变化的业务逻辑，这里提供了所有需要实现的block：

//blocks for UITableView delegate
typedef UITableViewCell* (^cellForRowAtIndexPathDelegate) (UITableView *,NSIndexPath *);
typedef CGFloat (^heightForRowAtIndexPathDelegate) (UITableView *,NSIndexPath *);
typedef void (^didSelectRowAtIndexPathDelegate) (UITableView *,NSIndexPath *);

//blocks for refresh and load more
typedef void (^refreshDataSourceFunc) (void);
typedef void (^loadMoreDataSourceFunc) (void);

typedef void (^refreshDataSourceCompleted) (void);
typedef void (^loadMoreDataSourceCompleted) (void);
//use to load image (async)
typedef void (^loadImagesForVisiableRowsFunc) (void);
typedef void (^appImageDownloadCompleted) (NSIndexPath *);

//blocks for UITableView delegate
typedef UITableViewCell* (^cellForRowAtIndexPathDelegate) (UITableView *,NSIndexPath *);
typedef CGFloat (^heightForRowAtIndexPathDelegate) (UITableView *,NSIndexPath *);
typedef void (^didSelectRowAtIndexPathDelegate) (UITableView *,NSIndexPath *);

//blocks for refresh and load more
typedef void (^refreshDataSourceFunc) (void);
typedef void (^loadMoreDataSourceFunc) (void);

typedef void (^refreshDataSourceCompleted) (void);
typedef void (^loadMoreDataSourceCompleted) (void);
//use to load image (async)
typedef void (^loadImagesForVisiableRowsFunc) (void);
typedef void (^appImageDownloadCompleted) (NSIndexPath *);

它们以属性的形式对外公开：

//property for blocks
@property (nonatomic,copy) cellForRowAtIndexPathDelegate cellForRowAtIndexPathDelegate;
@property (nonatomic,copy) heightForRowAtIndexPathDelegate heightForRowAtIndexPathDelegate;
@property (nonatomic,copy) didSelectRowAtIndexPathDelegate didSelectRowAtIndexPathDelegate;

@property (nonatomic,copy) loadMoreDataSourceFunc loadMoreDataSourceFunc;
@property (nonatomic,copy) refreshDataSourceFunc refreshDataSourceFunc;
@property (nonatomic,copy) refreshDataSourceCompleted refreshDataSourceCompleted;
@property (nonatomic,copy) loadMoreDataSourceCompleted loadMoreDataSourceCompleted;

@property (nonatomic,copy) loadImagesForVisiableRowsFunc loadImagesForVisiableRowsFunc;
@property (nonatomic,copy) appImageDownloadCompleted appImageDownloadCompleted;

//property for blocks
@property (nonatomic,copy) cellForRowAtIndexPathDelegate cellForRowAtIndexPathDelegate;
@property (nonatomic,copy) heightForRowAtIndexPathDelegate heightForRowAtIndexPathDelegate;
@property (nonatomic,copy) didSelectRowAtIndexPathDelegate didSelectRowAtIndexPathDelegate;

@property (nonatomic,copy) loadMoreDataSourceFunc loadMoreDataSourceFunc;
@property (nonatomic,copy) refreshDataSourceFunc refreshDataSourceFunc;
@property (nonatomic,copy) refreshDataSourceCompleted refreshDataSourceCompleted;
@property (nonatomic,copy) loadMoreDataSourceCompleted loadMoreDataSourceCompleted;

@property (nonatomic,copy) loadImagesForVisiableRowsFunc loadImagesForVisiableRowsFunc;
@property (nonatomic,copy) appImageDownloadCompleted appImageDownloadCompleted;

对于上提加载更多、下拉刷新、图片异步加载这几个功能都是可选的，它们以组件的形式存在。比如，在实例化该controller的时候你就可以设置上提和下拉是否可用。而对于图片下载，你只要不实现其相应得block，它也不会对你造成额外的负担。

- (id)initWithRefreshHeaderViewEnabled:(BOOL)enableRefreshHeaderView
andLoadMoreFooterViewEnabled:(BOOL)enableLoadMoreFooterView;

- (id)initWithRefreshHeaderViewEnabled:(BOOL)enableRefreshHeaderView
          andLoadMoreFooterViewEnabled:(BOOL)enableLoadMoreFooterView
                     andTableViewFrame:(CGRect)frame;

- (id)initWithRefreshHeaderViewEnabled:(BOOL)enableRefreshHeaderView 
andLoadMoreFooterViewEnabled:(BOOL)enableLoadMoreFooterView;

- (id)initWithRefreshHeaderViewEnabled:(BOOL)enableRefreshHeaderView 
          andLoadMoreFooterViewEnabled:(BOOL)enableLoadMoreFooterView 
                     andTableViewFrame:(CGRect)frame;

#pragma mark - UITableView Delegate -
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section{
    if (nil==self.dataSource) {
        return 0;
    }

    return [self.dataSource count];
}

- (UITableViewCell*)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath{
    if (!self.cellForRowAtIndexPathDelegate) {
        @throw [NSException exceptionWithName:@"Framework Error"
                                       reason:@"Must be setting cellForRowAtIndexPathBlock for UITableView" userInfo:nil];
    }
    return self.cellForRowAtIndexPathDelegate(tableView,indexPath);
}

- (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath{
    if (!self.heightForRowAtIndexPathDelegate) {
        @throw [NSException exceptionWithName:@"Framework Error"
                                       reason:@"Must be setting heightForRowAtIndexPathDelegate for UITableView" userInfo:nil];
    }
    return self.heightForRowAtIndexPathDelegate(tableView,indexPath);
}

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath{
    if (self.didSelectRowAtIndexPathDelegate) {
        self.didSelectRowAtIndexPathDelegate(tableView,indexPath);
    }
}

#pragma mark - LoadMoreTableFooterDelegate Methods -
- (void)loadMoreTableFooterDidTriggerRefresh:(LoadMoreTableFooterView *)view{
    if (self.loadMoreDataSourceFunc&&self.loadMoreDataSourceCompleted) {
        self.loadMoreDataSourceFunc();

        double delayInSeconds = 3.0;
        dispatch_time_t popTime = dispatch_time(DISPATCH_TIME_NOW, delayInSeconds * NSEC_PER_SEC);
        dispatch_after(popTime, dispatch_get_main_queue(),
                       self.loadMoreDataSourceCompleted);
    }
}

- (BOOL)loadMoreTableFooterDataSourceIsLoading:(LoadMoreTableFooterView *)view{
    return self.isLoadingMore;
}

#pragma mark - EGORefreshTableHeaderDelegate Methods -
-(void)egoRefreshTableHeaderDidTriggerRefresh:(EGORefreshTableHeaderView *)view{
    if (self.refreshDataSourceFunc&&self.refreshDataSourceCompleted){
        self.refreshDataSourceFunc();

        double delayInSeconds = 3.0;
        dispatch_time_t popTime = dispatch_time(DISPATCH_TIME_NOW, delayInSeconds * NSEC_PER_SEC);
        dispatch_after(popTime, dispatch_get_main_queue(),
                       self.refreshDataSourceCompleted);
    }
}

-(BOOL)egoRefreshTableHeaderDataSourceIsLoading:(EGORefreshTableHeaderView *)view{
    return self.isRefreshing;
}

-(NSDate *)egoRefreshTableHeaderDataSourceLastUpdated:(EGORefreshTableHeaderView *)view{
    return [NSDate date];
}

#pragma mark - UIScrollViewDelegate Methods -
-(void)scrollViewWillBeginDecelerating:(UIScrollView *)scrollView{
    self.currentOffsetPoint=scrollView.contentOffset;
}

-(void)scrollViewDidScroll:(UIScrollView *)scrollView{
    CGPoint pt=scrollView.contentOffset;
    if (self.currentOffsetPoint.y<pt.y) {
        [self.loadMoreFooterView loadMoreScrollViewDidScroll:scrollView];
    }else {
        [self.refreshHeaderView egoRefreshScrollViewDidScroll:scrollView];
    }
}

-(void)scrollViewDidEndDragging:(UIScrollView *)scrollView willDecelerate:(BOOL)decelerate{
    CGPoint pt=scrollView.contentOffset;
    if (self.currentOffsetPoint.y<pt.y) {
        [self.loadMoreFooterView loadMoreScrollViewDidEndDragging:scrollView];
    }else {
        [self.refreshHeaderView egoRefreshScrollViewDidEndDragging:scrollView];
    }

    if (!decelerate&&self.loadImagesForVisiableRowsFunc) {
        self.loadImagesForVisiableRowsFunc();
    }
}

-(void)scrollViewDidEndDecelerating:(UIScrollView *)scrollView{
    if (self.loadImagesForVisiableRowsFunc) {
        self.loadImagesForVisiableRowsFunc();
    }
}

#pragma mark - download image async -
-(void)appImageDidLoad:(NSIndexPath *)indexPath{
    if (self.appImageDownloadCompleted) {
        self.appImageDownloadCompleted(indexPath);
    }
}

#pragma mark - UITableView Delegate -
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section{
    if (nil==self.dataSource) {
        return 0;
    }
    
    return [self.dataSource count];
}

- (UITableViewCell*)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath{
    if (!self.cellForRowAtIndexPathDelegate) {
        @throw [NSException exceptionWithName:@"Framework Error" 
                                       reason:@"Must be setting cellForRowAtIndexPathBlock for UITableView" userInfo:nil];
    }
    return self.cellForRowAtIndexPathDelegate(tableView,indexPath);
}

- (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath{
    if (!self.heightForRowAtIndexPathDelegate) {
        @throw [NSException exceptionWithName:@"Framework Error" 
                                       reason:@"Must be setting heightForRowAtIndexPathDelegate for UITableView" userInfo:nil];
    }
    return self.heightForRowAtIndexPathDelegate(tableView,indexPath);
}

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath{
    if (self.didSelectRowAtIndexPathDelegate) {
        self.didSelectRowAtIndexPathDelegate(tableView,indexPath);
    }
}

#pragma mark - LoadMoreTableFooterDelegate Methods -
- (void)loadMoreTableFooterDidTriggerRefresh:(LoadMoreTableFooterView *)view{
    if (self.loadMoreDataSourceFunc&&self.loadMoreDataSourceCompleted) {
        self.loadMoreDataSourceFunc();
        
        double delayInSeconds = 3.0;
        dispatch_time_t popTime = dispatch_time(DISPATCH_TIME_NOW, delayInSeconds * NSEC_PER_SEC);
        dispatch_after(popTime, dispatch_get_main_queue(), 
                       self.loadMoreDataSourceCompleted);
    }
}

- (BOOL)loadMoreTableFooterDataSourceIsLoading:(LoadMoreTableFooterView *)view{
    return self.isLoadingMore;
}

#pragma mark - EGORefreshTableHeaderDelegate Methods -
-(void)egoRefreshTableHeaderDidTriggerRefresh:(EGORefreshTableHeaderView *)view{
    if (self.refreshDataSourceFunc&&self.refreshDataSourceCompleted){
        self.refreshDataSourceFunc();
        
        double delayInSeconds = 3.0;
        dispatch_time_t popTime = dispatch_time(DISPATCH_TIME_NOW, delayInSeconds * NSEC_PER_SEC);
        dispatch_after(popTime, dispatch_get_main_queue(), 
                       self.refreshDataSourceCompleted);
    }
}

-(BOOL)egoRefreshTableHeaderDataSourceIsLoading:(EGORefreshTableHeaderView *)view{
    return self.isRefreshing;
}

-(NSDate *)egoRefreshTableHeaderDataSourceLastUpdated:(EGORefreshTableHeaderView *)view{
    return [NSDate date];
}

#pragma mark - UIScrollViewDelegate Methods -
-(void)scrollViewWillBeginDecelerating:(UIScrollView *)scrollView{
    self.currentOffsetPoint=scrollView.contentOffset;
}

-(void)scrollViewDidScroll:(UIScrollView *)scrollView{
    CGPoint pt=scrollView.contentOffset;
    if (self.currentOffsetPoint.y<pt.y) {
        [self.loadMoreFooterView loadMoreScrollViewDidScroll:scrollView];
    }else {		
        [self.refreshHeaderView egoRefreshScrollViewDidScroll:scrollView];
    }
}

-(void)scrollViewDidEndDragging:(UIScrollView *)scrollView willDecelerate:(BOOL)decelerate{
    CGPoint pt=scrollView.contentOffset;
    if (self.currentOffsetPoint.y<pt.y) {
        [self.loadMoreFooterView loadMoreScrollViewDidEndDragging:scrollView];
    }else {
        [self.refreshHeaderView egoRefreshScrollViewDidEndDragging:scrollView];
    }
    
    if (!decelerate&&self.loadImagesForVisiableRowsFunc) {
        self.loadImagesForVisiableRowsFunc();
    }
}

-(void)scrollViewDidEndDecelerating:(UIScrollView *)scrollView{
    if (self.loadImagesForVisiableRowsFunc) {
        self.loadImagesForVisiableRowsFunc();
    }
}

#pragma mark - download image async -
-(void)appImageDidLoad:(NSIndexPath *)indexPath{
    if (self.appImageDownloadCompleted) {
        self.appImageDownloadCompleted(indexPath);
    }
}

ELTableViewController 的使用

创建一个新的controller继承自：ELTableViewController；

override父类的initBlocks方法：

#pragma mark - private methods -
- (void)loadDataSource{
    self.dataSource=[NSMutableArray array];
    [self.dataSource addObject:@"dataSource_1"];
    [self.dataSource addObject:@"dataSource_2"];
    [self.dataSource addObject:@"dataSource_3"];
    [self.dataSource addObject:@"dataSource_4"];
    [self.dataSource addObject:@"dataSource_5"];
    [self.dataSource addObject:@"dataSource_6"];
    [self.dataSource addObject:@"dataSource_7"];
    [self.dataSource addObject:@"dataSource_8"];
    [self.dataSource addObject:@"dataSource_9"];
    [self.dataSource addObject:@"dataSource_10"];
}

- (void)initBlocks{
    __block TestViewController *blockedSelf=self;

    //load more
    self.loadMoreDataSourceFunc=^{
        [blockedSelf.dataSource addObject:@"loadMoreDataSourceBlock_1"];
        [blockedSelf.dataSource addObject:@"loadMoreDataSourceBlock_2"];
        [blockedSelf.dataSource addObject:@"loadMoreDataSourceBlock_3"];
        [blockedSelf.dataSource addObject:@"loadMoreDataSourceBlock_4"];
        [blockedSelf.dataSource addObject:@"loadMoreDataSourceBlock_5"];

        blockedSelf.isLoadingMore=YES;
        [self.tableView reloadData];

        NSLog(@"loadMoreDataSourceBlock was invoked");
    };

    //load more completed
    self.loadMoreDataSourceCompleted=^{
        blockedSelf.isLoadingMore=NO;
        [blockedSelf.loadMoreFooterView loadMoreScrollViewDataSourceDidFinishedLoading:self.tableView];

        NSLog(@"after loadMore completed");
    };

    //refresh
    self.refreshDataSourceFunc=^{
        blockedSelf.dataSource=[NSMutableArray array];
        [blockedSelf.dataSource addObject:@"refreshDataSourceBlock_1"];
        [blockedSelf.dataSource addObject:@"refreshDataSourceBlock_2"];
        [blockedSelf.dataSource addObject:@"refreshDataSourceBlock_3"];
        [blockedSelf.dataSource addObject:@"refreshDataSourceBlock_4"];
        [blockedSelf.dataSource addObject:@"refreshDataSourceBlock_5"];

        blockedSelf.isRefreshing=YES;
        [self.tableView reloadData];

        NSLog(@"refreshDataSourceBlock was invoked");
    };

    //refresh completed
    self.refreshDataSourceCompleted=^{
        blockedSelf.isRefreshing=NO;
        [blockedSelf.loadMoreFooterView loadMoreScrollViewDataSourceDidFinishedLoading:self.tableView];

        NSLog(@"after refresh completed");
    };

    self.cellForRowAtIndexPathDelegate=^(UITableView *tableView, NSIndexPath *indexPath){
        static NSString *cellIdentifier=@"cellIdentifier";
        UITableViewCell *cell=[tableView dequeueReusableCellWithIdentifier:cellIdentifier];
        if (!cell) {
            cell=[[[UITableViewCell alloc]initWithStyle:UITableViewCellStyleDefault reuseIdentifier:cellIdentifier]autorelease];
        }

        cell.textLabel.text=[blockedSelf.dataSource objectAtIndex:indexPath.row];

        NSLog(@"block:cellForRowAtIndexPathBlock has been invoked.");

        return cell;
    };

    self.heightForRowAtIndexPathDelegate=^(UITableView *tableView, NSIndexPath *indexPath){
        NSLog(@"block:heightForRowAtIndexPathBlock has been invoked.");
        return 60.0f;
    };

    self.didSelectRowAtIndexPathDelegate=^(UITableView *tableView, NSIndexPath *indexPath){
        NSLog(@"block:didSelectRowAtIndexPathDelegate has been invoked.");
    };

}

#pragma mark - private methods -
- (void)loadDataSource{
    self.dataSource=[NSMutableArray array];
    [self.dataSource addObject:@"dataSource_1"];
    [self.dataSource addObject:@"dataSource_2"];
    [self.dataSource addObject:@"dataSource_3"];
    [self.dataSource addObject:@"dataSource_4"];
    [self.dataSource addObject:@"dataSource_5"];
    [self.dataSource addObject:@"dataSource_6"];
    [self.dataSource addObject:@"dataSource_7"];
    [self.dataSource addObject:@"dataSource_8"];
    [self.dataSource addObject:@"dataSource_9"];
    [self.dataSource addObject:@"dataSource_10"];
}

- (void)initBlocks{
    __block TestViewController *blockedSelf=self;
    
    //load more
    self.loadMoreDataSourceFunc=^{
        [blockedSelf.dataSource addObject:@"loadMoreDataSourceBlock_1"];
        [blockedSelf.dataSource addObject:@"loadMoreDataSourceBlock_2"];
        [blockedSelf.dataSource addObject:@"loadMoreDataSourceBlock_3"];
        [blockedSelf.dataSource addObject:@"loadMoreDataSourceBlock_4"];
        [blockedSelf.dataSource addObject:@"loadMoreDataSourceBlock_5"];
        
        blockedSelf.isLoadingMore=YES;
        [self.tableView reloadData];
        
        NSLog(@"loadMoreDataSourceBlock was invoked");
    };
    
    //load more completed
    self.loadMoreDataSourceCompleted=^{
        blockedSelf.isLoadingMore=NO;
        [blockedSelf.loadMoreFooterView loadMoreScrollViewDataSourceDidFinishedLoading:self.tableView];
        
        NSLog(@"after loadMore completed");
    };
    
    //refresh
    self.refreshDataSourceFunc=^{
        blockedSelf.dataSource=[NSMutableArray array];
        [blockedSelf.dataSource addObject:@"refreshDataSourceBlock_1"];
        [blockedSelf.dataSource addObject:@"refreshDataSourceBlock_2"];
        [blockedSelf.dataSource addObject:@"refreshDataSourceBlock_3"];
        [blockedSelf.dataSource addObject:@"refreshDataSourceBlock_4"];
        [blockedSelf.dataSource addObject:@"refreshDataSourceBlock_5"];
        
        blockedSelf.isRefreshing=YES;
        [self.tableView reloadData];
        
        NSLog(@"refreshDataSourceBlock was invoked");
    };
    
    //refresh completed
    self.refreshDataSourceCompleted=^{
        blockedSelf.isRefreshing=NO;
        [blockedSelf.loadMoreFooterView loadMoreScrollViewDataSourceDidFinishedLoading:self.tableView];
        
        NSLog(@"after refresh completed");
    };
    
    self.cellForRowAtIndexPathDelegate=^(UITableView *tableView, NSIndexPath *indexPath){
        static NSString *cellIdentifier=@"cellIdentifier";
        UITableViewCell *cell=[tableView dequeueReusableCellWithIdentifier:cellIdentifier];
        if (!cell) {
            cell=[[[UITableViewCell alloc]initWithStyle:UITableViewCellStyleDefault reuseIdentifier:cellIdentifier]autorelease];
        }
        
        cell.textLabel.text=[blockedSelf.dataSource objectAtIndex:indexPath.row];
        
        NSLog(@"block:cellForRowAtIndexPathBlock has been invoked.");
        
        return cell;
    };
    
    self.heightForRowAtIndexPathDelegate=^(UITableView *tableView, NSIndexPath *indexPath){
        NSLog(@"block:heightForRowAtIndexPathBlock has been invoked.");
        return 60.0f;
    };
    
    self.didSelectRowAtIndexPathDelegate=^(UITableView *tableView, NSIndexPath *indexPath){
        NSLog(@"block:didSelectRowAtIndexPathDelegate has been invoked.");
    };
    
}

然后在ViewDidLoad中调用：

[self initBlocks];
    [self loadDataSource];
    [self.tableView reloadData];

[self initBlocks];
    [self loadDataSource];
    [self.tableView reloadData];

最后，你在实例化该controller的时候，可以指定是否使用上提和下拉

self.viewController = [[[TestViewController alloc] initWithRefreshHeaderViewEnabled:YES andLoadMoreFooterViewEnabled:YES]autorelease];

self.viewController = [[[TestViewController alloc] initWithRefreshHeaderViewEnabled:YES andLoadMoreFooterViewEnabled:YES]autorelease];

写在最后

写完之后，我用它重构了一下快易博中，新浪微博的几个视图。也省掉了一些冗余代码，如果当初在开发的时候就使用它的话，感觉还是省了一些功夫的。

它其实也还是比较简单的封装，所以还不是很具有业务相关性，同时也可见它还有很多可继续增强的功能：

1、  封装增删改查功能

2、  封装加载、操作时动画

3、  封装网络加载的统一实现

……………….

先写到这里吧。

推荐两篇讲ios block非常不错的文章：

http://lldong.github.com/blog/2011/12/30/blocks/

http://yannickloriot.com/2011/11/working-with-blocks/

源码地址：

https://github.com/yanghua/ELTableViewController