iOS UIPageControl的简单使用

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions{    self.window = [[[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]] autorelease];    // Override point for customization after application launch.    self.window.backgroundColor = [UIColor whiteColor];            UIPageControl *pagelCtrl=[[UIPageControl alloc]initWithFrame:CGRectMake(0, 100, 320, 40)];    pagelCtrl.backgroundColor=[UIColor grayColor];    //指示器颜色    pagelCtrl.pageIndicatorTintColor=[UIColor redColor];    //    pagelCtrl.enabled=NO;    //添加方法    [pagelCtrl addTarget:self action:@selector(pageChange:) forControlEvents:UIControlEventValueChanged];    //耗内存...    [NSTimer scheduledTimerWithTimeInterval:1 target:self selector:@selector(changeValue:) userInfo:pagelCtrl repeats:YES];    //当单页时隐藏    pagelCtrl.hidesForSinglePage=YES;    //页数    pagelCtrl.numberOfPages=5;    //当前页    pagelCtrl.currentPage=3;    //添加到window    [self.window addSubview:pagelCtrl];    [pagelCtrl release];//释放        [self.window makeKeyAndVisible];    return YES;}//pagelCtrl 响应的方法-(void)pageChange:(UIPageControl *)pageContrl{    NSLog(@"当前的页数：%i",pageContrl.currentPage+1);}-(void)changeValue:(NSTimer *)timer{    UIPageControl *pagelCtrl=[timer userInfo];    if (pagelCtrl.currentPage<4) {        pagelCtrl.currentPage++;    }    else    {        pagelCtrl.currentPage=0;    }}