How to add Scheduling in a Sandboxed app?

Question

I need to add scheduling to my app. So that my app will launch automatically at a specified time and date. I have done it by referring Scheduling Timed Jobs. I have placed the plist file for scheduling in /Users/username/Library/LaunchAgents. It works well in the non-sandboxed app, but it is not working in a sandboxed app. I can't able to add the scheduling file to the path /Users/username/Library/LaunchAgents. It gives me the error

Error Domain=NSCocoaErrorDomain Code=513 "“com.sample.schedule.plist” couldn’t be copied because you don’t have permission to access “LaunchAgents”." UserInfo=0x100114f10 {NSSourceFilePathErrorKey=/Users/username/Library/Developer/Xcode/DerivedData/SchedulingInSandbox-cernhnigkuqhehbndryxlekpiiiu/Build/Products/Debug/SchedulingInSandbox.app/Contents/Resources/com.sample.schedule.plist, NSUserStringVariant=(
    Copy
), NSDestinationFilePath=/Users/username/Library/LaunchAgents/com.sample.schedule.plist, NSFilePath=/Users/username/Library/Developer/Xcode/DerivedData/SchedulingInSandbox-cernhnigkuqhehbndryxlekpiiiu/Build/Products/Debug/SchedulingInSandbox.app/Contents/Resources/com.sample.schedule.plist, NSUnderlyingError=0x1001132d0 "The operation couldn’t be completed. Operation not permitted"}

I have added the LaunchAgents Path in Entitlements too.

<key>com.apple.security.temporary-exception.files.home-relative-path.read-write</key>
<array>
    <string>/Library/LaunchAgents/</string>
</array>

But still I can't able to add the scheculing plist in LaunchAgents Directory. Whether I am doing correctly or there is another way for the doing the scheduling in sandboxed app.

EDIT 1:
If I manually create the folder in /Library/Containers/LaunchAgents and put the plist there I am getting this error:

Could not open job overrides database at: /private/var/db/launchd.db/com.apple.launchd.peruser.501/overrides.plist: 1: Operation not permitted
launch_msg(): Socket is not connected

Answer 1

Try putting your job plist into

/Users/<username>/Library/Containers/<my app identifier>/Data/Library/LaunchAgents/<my app identifier>.<somename>.plist

This would be the data container for your sandboxed app.

Looking on my Mac I see that FaceTime has two scheduled job plists in there you can probably use as an example.