iOS UIApplication的常见设置

UIApplication的常见设置

- (void)viewDidLoad {
    [super viewDidLoad];
   UIApplication *app =  [UIApplication sharedApplication];
    //app提醒数字,必须注册用户通知
    app.applicationIconBadgeNumber = 1;
    UIUserNotificationSettings *setting = [UIUserNotificationSettings settingsForTypes:UIUserNotificationTypeBadge categories:nil];
    [app registerUserNotificationSettings:setting];
    //app联网状态提醒
    app.networkActivityIndicatorVisible = YES;
    self.view.backgroundColor = [UIColor greenColor];
    
}
////由控制器管理隐藏最顶部的状态栏
//-(BOOL)prefersStatusBarHidden
//{
//    return YES;
//}
//-(UIStatusBarStyle)preferredStatusBarStyle
//{
//    return UIStatusBarStyleDefault;
//}
-(void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
{
    UIApplication *app =  [UIApplication sharedApplication];
    /**
     * 在info.plist文件中添加 View controller-based status bar appearance Value: NO(状态栏不再由控制器管理，改为UIApplication管理)
     */
    [app setStatusBarHidden:YES withAnimation:UIStatusBarAnimationSlide];
}

UIApplication生命周期方法

//程序启动完成调用
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
    return YES;
}
//当app失去活跃的时候调用
- (void)applicationWillResignActive:(UIApplication *)application
 {
}
//当app进入后台的时候调用,app被打断的时候，在这里保存一些需要用到的数据
- (void)applicationDidEnterBackground:(UIApplication *)application {

}
//当app进入前台的时候
- (void)applicationWillEnterForeground:(UIApplication *)application {

}
//当app活跃的时候调用，以为着app可以和用户交互
- (void)applicationDidBecomeActive:(UIApplication *)application {

}
//当app被销毁的时候调用
- (void)applicationWillTerminate:(UIApplication *)application {

}
//当app接受到内存警告的时候调用
-(void)applicationDidReceiveMemoryWarning:(UIApplication *)application
{
    NSLog(@"%s, line = %d",__FUNCTION__,__LINE__);
}