ios7 displaying a refresh control for tableviews

static NSString *CellIdentifier = @"Cell";

@interface  ()

@property (nonatomic, strong) NSMutableArray *allTimes;
//iOS6下啦刷新
@property (nonatomic, strong) UIRefreshControl *refreshControl;
@end

@implementation 

-(void)viewDidLoad{
    [super viewDidLoad];
    self.edgesForExtendedLayout = UIRectEdgeNone;
}

- (void) handleRefresh:(id)paramSender{
    
    // 不仅仅是做更新动画
    int64_t delayInSeconds = 1.0f;
    //GCD 抽象的表示时间
    dispatch_time_t popTime = dispatch_time(DISPATCH_TIME_NOW, delayInSeconds * NSEC_PER_SEC);
    
    dispatch_after(popTime, dispatch_get_main_queue(), ^(void){
        
        //　　添加当前日期的日期列表 表视图刷新时,将出现一个新的项目
        [self.allTimes addObject:[NSDate date]];
        //停止刷新
        [self.refreshControl endRefreshing];
        
        NSIndexPath *indexPathOfNewRow =
            [NSIndexPath indexPathForRow:self.allTimes.count-1 inSection:0];
        //添加行
        [self.tableView
             insertRowsAtIndexPaths:@[indexPathOfNewRow]
             withRowAnimation:UITableViewRowAnimationAutomatic];
    });
    
}

- (id)initWithStyle:(UITableViewStyle)style{
    self = [super initWithStyle:style];
    if (self) {
        //注册cell类
        [self.tableView registerClass:[UITableViewCell class]
               forCellReuseIdentifier:CellIdentifier];
        //可变数组添加对象
        self.allTimes = [NSMutableArray arrayWithObject:[NSDate date]];
        
        /* 创建refresh control */
        self.refreshControl = [[UIRefreshControl alloc] init];
        self.refreshControl = self.refreshControl;
        //添加刷新事件
        [self.refreshControl addTarget:self action:@selector(handleRefresh:) forControlEvents:UIControlEventValueChanged];
        
    }
    return self;
}

- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView{
    return 1;
}

//allTimes.count rows
- (NSInteger)tableView:(UITableView *)tableView
 numberOfRowsInSection:(NSInteger)section{
    return self.allTimes.count;
}

- (UITableViewCell *)tableView:(UITableView *)tableView
         cellForRowAtIndexPath:(NSIndexPath *)indexPath{
    
    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier forIndexPath:indexPath];
    
    cell.textLabel.text = [NSString stringWithFormat:@"%@",self.allTimes[indexPath.row]];
    
    return cell;
}

@end