`UIAlertController`子类显示警报标题上方的图像_Swift.zip

# AlertViewController Adds ability to display `UIImage` above the title label of `UIAlertController`. Functionality is achieved by adding “\n” characters to `title`, to make space for `UIImageView` to be added to `UIAlertController.view`. Set `title` as normal but when retrieving value use `originalTitle` property. # UIAlertAction+Extensions Adds ability to display image left of the action title, by leveraging KVC. Also checks whether `UIAlertAction` responds to appropriate selector to avoid crashes if property is not available in the future.  [stringcode.co.uk](http://www.stringcode.co.uk/?p=1156&preview=true) [@stringcode](https://twitter.com/stringcode)