title: How to autocomplete a block signature in Xcode?
body: <p>When I'm writing a function that takes a block, I see the signature highlighted, but hitting tab will not autocomplete the signature. I am forced to type out the entire signature. The below example is not that hard to type, but I often run into cases where the signature is quite long and my short-term memory is not good enough to type the whole thing. The dilemma is that once I start typing, the signature disappears, offering no help in completing it.</p>