I use KeychainItemWrapper to store an identifier of my users in keychain
of iOS. I noticed that when we uninstall the app, the identifier persist in the keychain
yet; but I'm wonder Does iOS will clean the items automatically when the keychain
goes so big? or some other applications can remove or access the items?
With iCloud Keychain, you can keep your passwords and other secure information updated across your devices. iCloud Keychain remembers things, so that you don't have to. It auto-fills your information—like your Safari usernames and passwords, credit cards, and Wi-Fi passwords on any device that you approve.
In the Keychain Access app on your Mac, if your keychains aren't visible, choose Window > Keychain Access. Select a keychain in the Keychains list. Choose File > Delete Keychain [keychain name]. Click Delete References.
Everything stored in iCloud Keychain is secure—it's protected by industry-standard encryption. Your iCloud Keychain can't be set up on another Mac or iOS or iPadOS device unless you approve it.
It will be deleted if the device is wiped or restored, whatever that resets your device.
Access to the keychain is tied to the provisioning profile used to sign the app. Consequently no other apps would be able to access that app's keychain info. This answers your question about some other App being able to access your App's keychain items or not.
For reference: Same Question on Apple Developer Forum
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