I noted a while back that the Tumblr app for iOS now supports
x-callback-url, and I’ve played around with various URL actions in Drafts which make use of the implementation. I find in most cases, however, it’s easier to post text-based items using Tumblr’s publish-via-email feature—it sends the text directly to a blog, without requiring a ton of fiddling in the Tumblr app along the way. This being the case, I’m sticking with a Drafts email action which sends my text posts to a blog directly, with just one tap.
Tumblr’s email mechanism is actually very well thought out, and allows for everything from tagging to categorization to titling—and you won’t have to remember any annoying syntax if you write with Drafts; you’ll just enter your template into an email action and never think about it again. One quick, indispensable tip: if you write in Markdown (and why wouldn’t you?), simply add
!m to the body section of your email action, and Tumblr will automatically convert your Markdown to HTML. Give it a try. As much as I like URL actions, sometimes you just want to fire off the text without tapping around in two different apps.