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iOS simulator runtimes on macOS runners

Preinstalled simulator runtimes, how to add one at job time, and how to run simulator tests in parallel.

Specifications

iOS
17.5, 18.0, 18.2, 18.4
watchOS
10.5, 11.2
tvOS
17.5, 18.2
visionOS
2.2

Runner labels

  • runnerhut-macos-15-m4

Downloading a simulator runtime at job time costs 3–6 minutes every run. The preinstalled set covers the versions most teams target; pin to one of those and the download disappears entirely.

bash
xcrun simctl list runtimes
xcrun simctl list devices available
List what is already on the image

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