EGOTableViewPullRefresh动态刷新按钮

EGOTableViewPullRefresh 是fork EGOTableViewPullRefresh开源类库进行的改进，添加了上提加载更多效果。同时也可以通过一个按钮的触发刷新事件，但是刷新的时候不能跳到top，为了动态展示，再刷新的时候按钮旋转，然后跳转回到顶部！如下如图

关于EGOTableViewPullRefresh可以参照http://blog.csdn.net/duxinfeng2010/article/details/9007311，翻译过的用法，在这个Demo基础上进行修改，点击Demo下载；

1、给工程添加一个导航栏，在application: didFinishLaunchingWithOptions:方法中

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
    // Override point for customization after application launch.
//    [[UINavigationBar appearance] setBackgroundImage:[UIImage p_w_picpathNamed:@"navbar.png"] forBarMetrics:UIBarMetricsDefault];
               
    UINavigationController *nav = [[UINavigationController alloc] initWithRootViewController:self.viewController];
    self.window.rootViewController = nav;
    [self.window makeKeyAndVisible];
    return YES;
}

2、在ViewDidLoad方法中，修改背景图片，添加刷新按钮

- (void)viewDidLoad
{
    [super viewDidLoad];
    self.navigationController.navigationBar.tintColor = [UIColor colorWithPatternImage:[UIImage p_w_picpathNamed:@"navbar.png"]];
         
    self.pullTableView.pullArrowImage = [UIImage p_w_picpathNamed:@"blackArrow"];
//    self.pullTableView.pullBackgroundColor = [UIColor yellowColor];
    self.pullTableView.pullTextColor = [UIColor blackColor];
         
    CGRect rect = CGRectMake(0, 0, 44, 44);
    UIButton *refreshBtn = [UIButton buttonWithType:UIButtonTypeRoundedRect];
    refreshBtn.frame = rect;
    [refreshBtn setBackgroundImage:[UIImage p_w_picpathNamed:@"button_refresh"] forState:UIControlStateNormal];
    [refreshBtn addTarget:self action:@selector(refresh:) forControlEvents:UIControlEventTouchUpInside];
    UIBarButtonItem *refreshItem = [[UIBarButtonItem alloc] initWithCustomView:refreshBtn];
    self.navigationItem.leftBarButtonItem = refreshItem;
         
}

3、添加刷新按钮事件，和按钮旋转方法

//按钮旋转
- (void)startAnimation:(UIButton *)button{
    CABasicAnimation *rotate =
    [CABasicAnimation animationWithKeyPath:@"transform.rotation"];   
    [rotate setByValue:[NSNumber numberWithFloat:M_PI*4]];
    rotate.duration = 3.0;
    rotate.timingFunction =
    [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseInEaseOut];
    [button.layer addAnimation:rotate
                        forKey:@"myRotationAnimation"];
           
}

-(void)refresh:(UIButton *)button
{
    [self startAnimation:button];
//    判断一下table是否处于刷新状态，如果没有则执行本次刷新
    if (!self.pullTableView.pullTableIsRefreshing) {
        self.pullTableView.pullTableIsRefreshing = YES;
//        设置回到top时候table的位置
        [self.pullTableView setContentOffset:CGPointMake(0, -60) animated:YES];
        [self performSelector:@selector(refreshTable) withObject:nil afterDelay:3.0];
    }
                 
}

×××地址:https://github.com/XFZLDXF/RefreshButtonDemo