In the build settings, change Architecturesto $(ARCHS_STANDARD_32_BIT).
Then select iPhone Retina (4-inch 64-bit)for the simulator.
It will build a 32-bit version of your application, but run it on a 64-bit simulator. Please note that the simulator works on OS X, and OS X no longer supports 32 bits, so we always worked on 32-bit applications on 64-bit equipment in the simulator. It works fine if you do not need any types that should be 64-bit (for example: CGFloat is more accurate than decimal digits when executing 64-bit).
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