UIBarButtonItem 文字颜色

UIBarButtonItem *item = [UIBarButtonItem appearance];
    
    [[UIBarButtonItem appearanceWhenContainedIn:[UISearchBar class], nil] setTitleTextAttributes:[NSDictionary dictionaryWithObjectsAndKeys:[UIColor darkGrayColor],NSForegroundColorAttributeName,nil] forState:UIControlStateNormal];
    
    // 设置文字属性
    NSMutableDictionary *textAttrs = [NSMutableDictionary dictionary];
    textAttrs[NSForegroundColorAttributeName] =  [UIColor redColor] ;
    //    textAttrs[UITextAttributeTextShadowOffset] = [NSValue valueWithUIOffset:UIOffsetZero];
    textAttrs[NSFontAttributeName] = [UIFont systemFontOfSize:16];
    [item setTitleTextAttributes:textAttrs forState:UIControlStateNormal];
    [item setTitleTextAttributes:textAttrs forState:UIControlStateHighlighted];