从UISearchBar更改UIBarButtonItem

我想更改iOS 8中UISearchBar内的取消按钮的文本字体和颜色.我已经尝试过iOS 6和7的解决方案,但它们似乎无法正常工作.

This was not the solution I was looking for, but it worked.

let cancelButtonAttributes: NSDictiOnary= [NSFontAttributeName: FONT_REGULAR_16!, NSForegroundColorAttributeName: COLOR_BLUE]
UIBarButtonItem.appearance().setTitleTextAttributes(cancelButtonAttributes, forState: UIControlState.Normal)