The Watch App is installed on the watch and I can tap and run it on the Watch, but watchAppInstalled method returns false.
Also, I can only install the Watch App using Xcode 7. If I try to install the Watch App using the Watch iOS app (from Apple) by turning on the switch, the Watch App gets deleted right after the installation completes.
Update: This bug is fixed in Xcode 7 beta 6
Apple Documentation says:
The session must be configured and activated before accessing this property.
So, you should configure and activate the session before using this property.
I had same issue.
I just add WatchConnectivity.framework to my main app target and watch extension target. And it works now.
Hope i helped.
Cheers.
Update: i read comments above and check my architecture: already had arm64
What worked for me was adding the arm64 architecture to both the Watch app and iOS app as @Zubair suggested.
Update: This bug is fixed in Xcode 7, beta 6
It now works for me, what I did:
Reset and Re-coupled the Apple Watch and added a Passcode to it (what I never did before).
Edit: You can then safely disable the Passcode and it will still work.
来源：https://stackoverflow.com/questions/31908445/watchos-2-beta-5-watchappinstalled-returns-false