隐藏状态栏

#pragma mark iPhoneX及全屏手机模态视图是不能隐藏状态栏的，所以可以使其带有导航视图控制器就可以隐藏了
//在试图将要已将出现的方法中
- (void)viewDidAppear:(BOOL)animated{
    [super viewDidAppear:animated];
    if ([self respondsToSelector:@selector(setNeedsStatusBarAppearanceUpdate)]) {
        //调用隐藏方法
        [self prefersStatusBarHidden];
        [self performSelector:@selector(setNeedsStatusBarAppearanceUpdate)];
        
        
    }
}

-(BOOL)prefersStatusBarHidden {
    return YES;
}