如何在基于WebKit的应用程序中启用本地存储？

I have a Cocoa/Objective-C application which embeds a WebKit WebView. I need to turn on database support and local storage. I know it can be done--I have it working in Safari--but I can't find an example of how to set this up in my own application.I have a Cocoa/Objective-C application which em