__auto_type autocompletion snippet for Xcode 8+. Just put it in ~/Library/Developer/Xcode/UserData/CodeSnippets/ and then start typing aut... in Xcode.

C138FB1B-8C83-477C-B33C-05551516167A.codesnippet

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
<dict>
	<key>IDECodeSnippetCompletionPrefix</key>
	<string>auto</string>
	<key>IDECodeSnippetCompletionScopes</key>
	<array>
		<string>CodeBlock</string>
	</array>
	<key>IDECodeSnippetContents</key>
	<string>__auto_type &lt;#name#&gt; = &lt;#value#&gt;;</string>
	<key>IDECodeSnippetIdentifier</key>
	<string>C138FB1B-8C83-477C-B33C-05551516167A</string>
	<key>IDECodeSnippetLanguage</key>
	<string>Xcode.SourceCodeLanguage.Objective-C</string>
	<key>IDECodeSnippetTitle</key>
	<string>__auto_type</string>
	<key>IDECodeSnippetUserSnippet</key>
	<true/>
	<key>IDECodeSnippetVersion</key>
	<integer>0</integer>
</dict>
</plist>