IOS UIApplication使用

- (void)viewDidLoad
{
[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.

//    UIApplication *app = [UIApplication sharedApplication];
//    UIApplication *app1 = [UIApplication sharedApplication];
////    UIApplication *app2 = [[UIApplication alloc] init];
//    NSLog(@"%p - %p ", app, app1);

UIButton *btn = [[UIButton alloc] initWithFrame:CGRectMake(100, 100, 100, 100)];
[btn setTitle:@"点我啊" forState:UIControlStateNormal];
[btn addTarget:self action:@selector(onClick) forControlEvents:UIControlEventTouchUpInside];
btn.backgroundColor = [UIColor redColor];
[self.view addSubview:btn];
}

- (void)onClick
{
//    NSLog(@"被点了");
UIApplication *app = [UIApplication sharedApplication];
// 设置应用程序图标上的数字
//    app.applicationIconBadgeNumber = 998;
// 设置状态栏的联网动画
//    app.networkActivityIndicatorVisible = YES;

// 设置状态栏的样式
// app.statusBarStyle = UIStatusBarStyleLightContent;
//    [app setStatusBarStyle:UIStatusBarStyleLightContent animated:YES];

// 设置状态栏是否隐藏
//    app.statusBarHidden = YES;
//    [app setStatusBarHidden:YES withAnimation:UIStatusBarAnimationFade];

/*
URL:统一资源定位符 , 用来唯一的表示一个资源
URL: 协议头://主机地址/资源路径

网络资源:http://www.baidu.com/images/20140603/abc.png
本地资源:file:///users/apple/desktop/abc.png
*/

NSURL *url = [NSURL URLWithString:@"http://ios.itcast.cn"];
[app openURL:url];
}

//- (UIStatusBarStyle)preferredStatusBarStyle
//{
//    return UIStatusBarStyleLightContent;
//}

//- (BOOL)prefersStatusBarHidden
//{
//    return YES;
//}