UITableView實現上拉加載更多

// 創建表格底部

- (void) createTableFooter

{
   

    myTableView.tableFooterView = nil;

   

    UIView *tableFooterView = [[UIView alloc] initWithFrame:CGRectMake(0.0f, 0.0f, myTableView.bounds.size.width, 40.0f)];

   
    UILabel *loadMoreText = [[UILabel alloc] initWithFrame:CGRectMake(0.0f, 0.0f, 116.0f, 40.0f)];
   
    [loadMoreText setCenter:tableFooterView.center];
   
    [loadMoreText setFont:[UIFont fontWithName:@"Helvetica Neue" size:14]];
   
    [loadMoreText setText:@"上拉顯示更多數據"];
   
    [tableFooterView addSubview:loadMoreText];

    

    myTableView.tableFooterView = tableFooterView;  

}

- (void)scrollViewDidEndDragging:(UIScrollView *)scrollView willDecelerate:(BOOL)decelerate

{

    // 下拉到最底部時顯示更多數據
   
    if(!_loadingMore && scrollView.contentOffset.y > ((scrollView.contentSize.height - scrollView.frame.size.height)))
       
    {
        NSLog(@"開始加載");
       
        [self loadDataBegin];
       
    }
   

}

// 開始加載數據

- (void) loadDataBegin

{
   
    if (_loadingMore == NO)
       
    {
       
        _loadingMore = YES;
       
        UIActivityIndicatorView *tableFooterActivityIndicator = [[UIActivityIndicatorView alloc] initWithFrame:CGRectMake(75.0f, 10.0f, 20.0f, 20.0f)];
       
        [tableFooterActivityIndicator setActivityIndicatorViewStyle:UIActivityIndicatorViewStyleGray];
       
        [tableFooterActivityIndicator startAnimating];
       
        [searchTableView.tableFooterView addSubview:tableFooterActivityIndicator];
       
        NSLog(@"正在加載");
       
        [self loadDataing];
       
    }
   

}

// 加載數據中

- (void) loadDataing

{

   /**

     *要處理的事件

     */

     [self loadDataEnd];

}

// 加載數據完畢

- (void) loadDataEnd

{
    NSLog(@"加載完畢");
   
    _loadingMore = NO;
   
    [self createTableFooter];
   
}