iOS15 导航栏变黑色

升级iOS15后，出现导航栏黑色问题

    if (@available(iOS 15.0, *)) {

           UINavigationBarAppearance *appperance = [[UINavigationBarAppearance alloc]init];

           //添加背景色

           = [UIColor whiteColor];

           = [[UIImage alloc]init];

           = nil;

           //设置字体颜色

           [appperance setTitleTextAttributes:@{NSForegroundColorAttributeName:Color_CellTitleColor}];

           self. = appperance;

           self. = appperance;

    }