html5 - iOS的webview加载出来的H5网页，怎么修

犹豫在初始化导航栏的时候 设置了[UIBarButtonItem appearance]  为clearColor

所以导致在在h5里的界面弹出的输入框中, 完成 和 清除 按钮一直不能正常显示, 都是半透明状态, 而单纯加载本地的html5 

UIBarButtonItem *item = [UIBarButtonItem appearance];    

NSMutableDictionary *attrs = [NSMutableDictionary dictionary];

  attrs[NSForegroundColorAttributeName] = [UIColor blueColor];

  [item setTitleTextAttributes:attrs forState:UIControlStateNormal];