UITableView下拉刷新

在ios6中，苹果针对UITableView的下拉刷新提供了自己的api：UIRefreshControl

先看h文件：

#import <UIKit/UIKit.h>@interface MyTableViewController : UITableViewController{    NSMutableArray *logs;    UIRefreshControl *rc;}@end

再看m文件：

#import "MyTableViewController.h"@interface MyTableViewController ()- (void)refreshTableView;- (void)callBackMethod:(id)obj;@end@implementation MyTableViewController- (id)initWithStyle:(UITableViewStyle)style{    self = [super initWithStyle:style];    if (self) {        // Custom initialization    }    return self;}- (void)viewDidLoad{    [super viewDidLoad];    // Uncomment the following line to preserve selection between presentations.    // self.clearsSelectionOnViewWillAppear = NO;     // Uncomment the following line to display an Edit button in the navigation bar for this view controller.    // self.navigationItem.rightBarButtonItem = self.editButtonItem;    self.navigationController.navigationBar.barStyle = UIBarStyleBlackOpaque;    logs = [NSMutableArray array];    NSDate *date = [[NSDate alloc] init];    [logs addObject:date];    rc = [[UIRefreshControl alloc] init];    rc.attributedTitle = [[NSAttributedString alloc] initWithString:@"下拉刷新"];    [rc addTarget:self action:@selector(refreshTableView) forControlEvents:UIControlEventValueChanged];    self.refreshControl = rc;    [self.tableView reloadData];}- (void)didReceiveMemoryWarning{    [super didReceiveMemoryWarning];    // Dispose of any resources that can be recreated.}#pragma mark - Table view data source- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView{#warning Potentially incomplete method implementation.    // Return the number of sections.    return 1;}- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section{#warning Incomplete method implementation.    // Return the number of rows in the section.    return [logs count];}- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath{    static NSString *CellIdentifier = @"Cell";    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];    if (cell == nil) {        cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier];    }        // Configure the cell...    NSDateFormatter *dateFormat = [[NSDateFormatter alloc] init];    [dateFormat setDateFormat: @"yyyy-MM-dd HH:mm:ss zzz"];    cell.textLabel.text = [dateFormat stringFromDate: [logs objectAtIndex:[indexPath row]]];    cell.accessoryType = UITableViewCellAccessoryDisclosureIndicator;    cell.selectionStyle = UITableViewCellSelectionStyleBlue;        return cell;}- (void)refreshTableView{    if (self.refreshControl.refreshing) {        self.refreshControl.attributedTitle = [[NSAttributedString alloc]initWithString:@"加载中…"];        //添加新的模拟数据        NSDate *date = [[NSDate alloc] init];        //模拟请求完成之后，回调方法callBackMethod        [self performSelector:@selector(callBackMethod:) withObject:date afterDelay:3];    }}- (void)callBackMethod:(id)obj{    [self.refreshControl endRefreshing];    self.refreshControl.attributedTitle = [[NSAttributedString alloc]initWithString:@"下拉刷新"];    [logs addObject:(NSDate*)obj];    [self.tableView reloadData];}@end