not allowed to query for scheme 🍎 iOS

-canOpenURL: failed for URL: "x://" - error: "This app is not allowed to query for scheme x"

The app called canOpenURL for a scheme not listed in LSApplicationQueriesSchemes in Info.plist.

Seen on: iOS

Meaning

Since iOS 9, apps must declare schemes they query (up to 50). open(_:) works without it, but canOpenURL returns false.

Common causes

  • Scheme missing from LSApplicationQueriesSchemes
  • Plist entry in a different target
  • Typo in the scheme name

⚡ Quick fix

  1. Add the scheme (without ://) to LSApplicationQueriesSchemes
  2. Or skip canOpenURL and call open with a completion handler

Detailed fix by platform

XML

  1. swift
    <key>LSApplicationQueriesSchemes</key>
<array>
  <string>whatsapp</string>
  <string>comgooglemaps</string>
</array>

How to diagnose

  1. Plist — Scheme listed?
  2. Target — Right Info.plist?

🔧 Still not fixed?

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