简单实现下拉刷新-----

我的下拉刷新使用了系统在tableviewcontroller中自带的属性.使用了UIRefreshController这个类.如下为代码,其中RootViewControl继承自UITableViewController.以下为代码.非常简单的一个示例

以下为.m中代码

#import "RootViewController.h"

@interface RootViewController ()

@end

@implementation RootViewController

- (id)initWithStyle:(UITableViewStyle)style
{
    self = [super initWithStyle:style];
    if (self) {
        self.arr = [[NSMutableArray alloc] initWithCapacity:5];
        [self.arr addObject:@"123"];
        [self.arr addObject:@"123"];
        [self.arr addObject:@"123"];
        [self.arr addObject:@"123"];
        [self.arr addObject:@"123"];
        [self.arr addObject:@"123"];
    }
    return self;
}
- (void)viewWillAppear:(BOOL)animated
{
    
}

- (void)viewDidLoad
{
    [super viewDidLoad];
    self.refreshControl = [[UIRefreshControl alloc] init];
    self.refreshControl.attributedTitle = [[NSAttributedString alloc] initWithString:@"下拉刷新"];
    [self.refreshControl addTarget:self action:@selector(a) forControlEvents:UIControlEventValueChanged];
    
}
- (void)a
{
    NSLog(@"1234");
    [self performSelector:@selector(handleData) withObject:nil afterDelay:2];

}
- (void)handleData
{
    [self.refreshControl endRefreshing];
    NSLog(@"nidaye");
    [self.arr addObject:@"123"];
    [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
{
    // Return the number of sections.
    return 1;
}

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
    // Return the number of rows in the section.
    return [self.arr count];
}

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
    static NSString *CellIdentifier = @"Cell";
    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
    if (cell == nil) {
        cell = [[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleSubtitle reuseIdentifier:CellIdentifier]autorelease];
    }
    cell.textLabel.text = [NSString stringWithFormat:@"%d",[self.arr count]-indexPath.row];
    NSLog(@"这说明正在复用");
    return cell;

}

@end

以下为.h中的代码

#import <UIKit/UIKit.h>

@interface RootViewController : UITableViewController
@property (retain,nonatomic) NSMutableArray *arr;
@end