- (void)viewDidLoad {

    [super viewDidLoad];

    // Do any additional setup after loading the view from its nib.

    // 方法一

    if ([self respondsToSelector:@selector(setEdgesForExtendedLayout:)]) {

        self.edgesForExtendedLayout = UIRectEdgeNone;

    }

    // 方法二

    self.edgesForExtendedLayout =UIRectEdgeNone;

    self.automaticallyAdjustsScrollViewInsets = NO;

    

    // 方法三

    self.edgesForExtendedLayout =UIRectEdgeNone;

    self.extendedLayoutIncludesOpaqueBars = YES;

    // 方法四

    if( ([[[UIDevice currentDevice] systemVersion] doubleValue]>=7.0)) {

        self.edgesForExtendedLayout = UIRectEdgeNone;

        self.extendedLayoutIncludesOpaqueBars = NO;

        self.modalPresentationCapturesStatusBarAppearance = NO;

    }





//方法五



    ViewController *vc = [[ViewController alloc] initWithNibName:@"ViewController" bundle:nil];

    //tabBar跳轉後不隱藏也可導致頂部被遮擋

    vc.hidesBottomBarWhenPushed = YES;

    [self.navigationController pushViewController:vc animated:YES];





}