IOS15设置UINavigation的半透明效果为不透明

 self.navigationController.navigationBar.translucent = NO;
    self.navigationController.navigationBar.backgroundColor = [UIColor whiteColor];
    UINavigationBarAppearance *appearance = [[UINavigationBarAppearance alloc]init];
    appearance.backgroundColor = [UIColor whiteColor];
    self.navigationController.navigationBar.standardAppearance =  appearance;
    self.navigationController.navigationBar.scrollEdgeAppearance = appearance;