iOS 6.1 simulator on OSX 10.10 Yosemite

Question

I am developing an application based on iOS 6.1, and after upgrading to OSX Yosemite can not run the simulator.

I\'ve been reading on stackoverflow, and some people

Answer 1

iOS Simulator runtimes older than iOS 7.1 will not work on OS X Yosemite.

You can still build your apps to support older iOS versions by setting an older deployment target, but you will not be able to test them on a simulated device running on OS X Yosemite. You can test on a physical device running iOS 6.1, or you can run Xcode 5.1.1 in OS X Mavericks to test your project in the older simulator.

This is not just an arbitrary requirement. This is a limitation of the legacy runtimes not being able to run on the newer host OS versions. The main reason support for sim versions get dropped in new releases is that they just don't work on the new OS versions for one reason or another and would require either major updates to the simulated runtime itself or hacky (performance-costing) workarounds added to the host OS to support them.

Over the past 5 years or so, we've pushed the interface layer between the host and sim lower and lower, reducing it now to probably the smallest that we can accomplish with the current model.