I have several projects developed in Xcode 10, but now Apple is saying (April 2020) that will not accept apps developed in Xcode 10, only Xcode 11. Is there any compatibility problem ? All my projects will compile properly in Xcode 11 ?
Is there any compatibility problem ? All my projects will compile properly in Xcode 11 ?
Try it and see? You don't really have a choice in the matter if Apple is going to stop accepting your Xcode 10 apps, so you might as well get started.
You can have multiple versions of Xcode installed at the same time. The best plan is to download Xcode from the developer site instead of the App Store, and rename each one with its version (e.g. Xcode-10.1, Xcode 11.4, etc.) so that they can all exist in your /Applications folder at the same time.
Xcode 11 will happily open your Xcode 10 projects, and everything should be fine. You may need to update some project settings to whatever Xcode 11 recommends, and your code will probably benefit from updates for the latest macOS or iOS versions.