Print is disabled for iOS version
This is a decent outliner but there are alternatives for iOS. It looks like the vendor has deliberately not provided a printing function for iOS so that you are forced to use the Mac version for "serious" work. In todays free market of iOS apps, my philosophy is to put money toward supporting the apps that give you better functionality so that those apps can continue to grow. This is the way market competition should work, for the benefit of the users. Vendors should understand that artificially depriving users of key functions is something that another software vendor has been known to do, and not to be acceptable to the Apple community.
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OmniOutliner 2