//导航条统一设置

    UIFont *font = [UIFont fontWithName:@"Helvetica" size:18.0];//标题字体大小

    NSDictionary *textAttributes = @{NSFontAttributeName : font,NSForegroundColorAttributeName:[UIColor whiteColor],};

    [[UINavigationBar appearance] setTitleTextAttributes:textAttributes];

//导航条颜色

    [[UINavigationBar appearance] setTintColor:[UIColor whiteColor]];

    [[UINavigationBar appearance] setTranslucent:NO];

    [[UINavigationBar appearance] setBarTintColor:navigationColor];

//导航条按钮设置

    [[UIBarButtonItem appearanceWhenContainedIn:[UINavigationBar class], nil] setTitleTextAttributes:@{NSFontAttributeName: [UIFont systemFontOfSize:14], NSForegroundColorAttributeName: [UIColor whiteColor]} forState:UIControlStateNormal];