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-(void)viewWillAppear:(BOOL)animated
{
    self.navigationController.navigationBar.hidden = YES;
    self.navigationController.navigationBar.translucent = YES;
    
    BOOL is7Version=[[[UIDevice currentDevice]systemVersion] floatValue] >= 7.0 ? YES : NO;
    if (is7Version) {
        self.edgesForExtendedLayout = UIRectEdgeNone;
        self.navigationController.navigationBar.translucent = NO;
    }

    if (@available(iOS 11.0, *)) {
        self.scrollView.contentInsetAdjustmentBehavior = UIScrollViewContentInsetAdjustmentNever;
    }
}