iOS15导航栏设置

    NSDictionary *dic = @{NSForegroundColorAttributeName:[UIColor blackColor],NSFontAttributeName:[UIFont systemFontOfSize:18 weight:(UIFontWeightSemibold)]};
    if (@available(iOS 15.0, *)) {
        UINavigationBarAppearance *barApp = [UINavigationBarAppearance new];
        barApp.backgroundColor = [UIColor whiteColor];
        barApp.titleTextAttributes = dic;
        barApp.backgroundEffect = nil;
        barApp.shadowColor = nil;
        self.navigationController.navigationBar.scrollEdgeAppearance = barApp;
        self.navigationController.navigationBar.standardAppearance = barApp;
    }else{
        self.navigationBar.barTintColor = [UIColor whiteColor];
        self.navigationBar.tintColor = [UIColor whiteColor];
        self.navigationBar.titleTextAttributes = dic;
    }