How to Use Open Quickly in Xcode (Cmd+Shift+O)

Cmd+Shift+O opens Open Quickly, a fuzzy-search overlay for jumping directly to any file, class, method, or symbol across the entire project by typing just a partial, approximately-remembered name. **Fuzzy matching in practice**: Open Quickly doesn't require an exact or even contiguous substring match — typing 'uivc' can successfully match 'UIViewController' by matching each typed letter in sequence against the target name's characters, which is considerably faster than typing out full, precise class names once you're comfortable trusting the fuzzy matching. **What it searches**: results include your own project's Swift/Objective-C files and symbols as well as symbols from imported frameworks, including Apple's system frameworks like UIKit and Foundation, letting you jump to a framework class's interface even without necessarily knowing which specific file or module it belongs to. **Navigating results without the mouse**: once a query is typed, the Up and Down arrows walk the highlight through whatever matches survived the filter, and Enter opens the highlighted result immediately — no mouse required from the moment the search box opens to the moment you land on the file. **When Open Quickly isn't the right tool**: it's built around jumping to named symbols and files specifically, not searching arbitrary text content — if you're hunting for every occurrence of a string or code pattern rather than one specific known destination, reach for Find in Project (Cmd+Shift+F) instead. **Related shortcuts**: Cmd+Click (or Ctrl+Cmd+J) for jumping directly to a specific symbol's definition from within code you're already viewing, and Cmd+Shift+F for full-text project-wide search when you don't have a specific named target in mind. **Distinguishing files with identical or similar names**: in a large project pulling in several Swift Package Manager dependencies or CocoaPods, it's genuinely possible for two unrelated types to share a very similar short name across different modules. Open Quickly's results list shows each match's containing file path alongside its name, which is worth glancing at before pressing Enter on the first result that looks right, especially in a workspace with several third-party dependencies alongside your own code. **Keyboard-only refinement**: typing additional distinguishing characters after your initial query narrows the results further without needing to clear and retype from scratch — if your first few letters surface too many matches, just keep typing more of the name and the list continues filtering live rather than requiring you to delete and restart the search. **Combining with Related Items for a faster workflow**: once you've used Open Quickly to land on a file, the Related Items menu (bound separately) often becomes the faster next step for hopping to a directly connected file — like moving from a view controller class to its corresponding Storyboard scene — rather than invoking Open Quickly a second time and typing a new search from scratch for something you already know is directly related to where you just landed. **Performance on very large projects**: Open Quickly's fuzzy search relies on Xcode's project index, which is built and maintained in the background as you work — on a freshly opened, very large project, the first few searches immediately after opening the workspace can feel slower or return incomplete results until that background indexing catches up, which resolves itself automatically after Xcode has had a little time to finish its initial pass.