//修改整体的navigationBar的背景颜色    [[UINavigationBar appearance] setBarTintColor:[UIColor colorWithRed:46/255.0 green:186/255.0 blue:157/255.0 alpha:1.0]];    //修改整体的navigationBar的字体颜色为白色    NSDictionary * dict=[NSDictionary dictionaryWithObject:[UIColor whiteColor] forKey:NSForegroundColorAttributeName];    [[UINavigationBar appearance] setTitleTextAttributes:dict];    [[UINavigationBar appearance] setTintColor:[UIColor redColor]];