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The hardware was drastically different between Macs and iPhones when iOS was released. That was in 2007. Apple only unified the hardware in 2020. Over the 13

The hardware was drastically different between Macs and iPhones when iOS was released. That was in 2007. Apple only unified the hardware in 2020. Over the *13* years, the operating systems have diverged so much that unifying them is a massive effort. The linked blog post by Zhuowei Zhang shows some of the differences. The user-space components are just so different that it's not as simple as running a macOS app on iOS. EDIT: You can run a iOS apps on macOS without recompilation, but it uses Mac Catalyst which is a user-space shim for iOS apps to work on macOS. Even then, not everything works.

azinman2 2y ago
You can run iOS apps directly on M1 Macs. Some developers flip a bit to disable this, but there any many that don’t.
- kuhsaft 2y ago
  In this case, the app is running in a sandbox with a user-space that simulates the iOS user-space [0]. > Your apps use the same frameworks and infrastructure that Mac Catalyst apps use to run, but without the need to recompile for the Mac platform. > Although you can run your iOS apps unmodified on a Mac with Apple silicon, Mac Catalyst lets you build your app specifically for macOS and customize your app’s behavior on that platform. Mac Catalyst was a multi-year effort by Apple. Doing the same to run macOS apps on iOS would probably be even harder due to how complicated macOS is compared to iOS. [0] https://developer.apple.com/documentation/apple-silicon/running-your-ios-apps-in-macos#overview https://developer.apple.com/documentation/apple-silicon/runn...
  - azinman2 2y ago
    It seems you agree, except previously you said “Likewise, you can't just run a iOS app on macOS. You need to recompile your app with Mac Catalyst for it to work. Even then, it's a bit jank.” That’s not true, you can just run an iOS app on macOS.
    - kuhsaft 2y ago
      I edited my original comment. The "It's a bit jank" part is still true though. When you enable running your app on macOS without compiling specifically for macOS with Mac Catalyst, it still uses Mac Catalyst, but transparently. So, you still get all the issues of Mac Catalyst, but without the compiler warnings. Your application may crash or behave strangely.

The hardware was drastically different between Macs and iPhones when iOS was released. That was in 2007. Apple only unified the hardware in 2020. Over the *13*

azinman2 2y ago

You can run iOS apps directly on M1 Macs. Some developers flip a bit to disable this, but there any many that don’t.

kuhsaft 2y ago
In this case, the app is running in a sandbox with a user-space that simulates the iOS user-space [0]. > Your apps use the same frameworks and infrastructure that Mac Catalyst apps use to run, but without the need to recompile for the Mac platform. > Although you can run your iOS apps unmodified on a Mac with Apple silicon, Mac Catalyst lets you build your app specifically for macOS and customize your app’s behavior on that platform. Mac Catalyst was a multi-year effort by Apple. Doing the same to run macOS apps on iOS would probably be even harder due to how complicated macOS is compared to iOS. [0] https://developer.apple.com/documentation/apple-silicon/running-your-ios-apps-in-macos#overview https://developer.apple.com/documentation/apple-silicon/runn...
- azinman2 2y ago
  It seems you agree, except previously you said “Likewise, you can't just run a iOS app on macOS. You need to recompile your app with Mac Catalyst for it to work. Even then, it's a bit jank.” That’s not true, you can just run an iOS app on macOS.
  - kuhsaft 2y ago
    I edited my original comment. The "It's a bit jank" part is still true though. When you enable running your app on macOS without compiling specifically for macOS with Mac Catalyst, it still uses Mac Catalyst, but transparently. So, you still get all the issues of Mac Catalyst, but without the compiler warnings. Your application may crash or behave strangely.