What are the wise and allowed ways to add advertisement to iPhone App?

I will be publishing an App in a few days. Initially I don't want to add advertisements, but can change my mind anytime, so I've thought this. Add a WebView to application and set its image to a dynamic web content. If no ads; I will display a simple logo, but when ads are available, replace the content with them. So there will be no modification t开发者_C百科o iPhone compiled binary.

Do you think it is allowed by Apple, and a good approach?

If you follow that approach, you will need to at least explain to Apple when you submit the app for review that ads may be enabled via a webservice.

Apple won't like it if you don't tell them that you might modify the apps feature set or behaviour after its approval.

You should be OK as long as you tell them about it.