1. Change templates to `IPHONEOS_DEPLOYMENT_TARGET`, `MinimumOSVersion`, and Podfile `platform :ios` to 12.0. 2. Add migrator for Podfile part to migrate `platform :ios, '11.0'` -> `platform :ios, '12.0'` 3. Compile with `-miphoneos-version-min=12.0` 4. Run the migrator on all example apps and integration tests. See also https://github.com/flutter/flutter/pull/62902 and https://github.com/flutter/flutter/pull/85174 and https://github.com/flutter/flutter/pull/101963 Fixes https://github.com/flutter/flutter/issues/136060
This extracts the sample code out from the API doc comments, and places them in separate files on disk, allowing running of the examples locally, testing them, and building of slightly larger examples.