iOS 10.1.1 popup saying “Application May Slow Down Your iPhone”

Question

When I build and run my app through Xcode on my real device I get a popup saying:

AppName May Slow Down Your iPhone

The developer of

Answer 1

This isn't a memory or a crash issue - it's Apple asking developers to update their apps with only 32-bit support with 64-bit support.

You must build a 64-bit binary with your existing app. To do so:

Start by building the app for the 64-bit runtime, fixing any warnings that occur as well as searching your code for specific 64-bit issues. For example:

• Make sure all function calls have a proper prototype.
• Avoid truncating 64-bit values by accidentally assigning them to a 32-bit data type.
• Ensure that calculations are performed correctly in the 64-bit version of your app.
• Create data structures whose layouts are identical in the 32-bit and 64-bit versions of your app (such as when you write a data file to iCloud).

There's more information in Apple's documentation on porting your app to 64-bit as well.