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Build restart-safe iOS direction and geofence handoffs

Own native editor generations, validate route and geometry candidates, provide an exact navigation-link fallback, separate target acknowledgement and application review, and recover safely after restart.

By the endTwo tested, durable iOS handoff journeys with explicit provider and application evidence boundaries.
Real-world scenario

Build against an explicit contract

A mobility application must let travelers choose a route and operations authors draft geofences through Mappls iOS UI surfaces without treating presentation, callback, deep-link opening, review, or publication as the same fact.

A Mappls developer projectA restricted iOS applicationFixture data with no production credentialsA request, aggregate, or correlation ID strategy
Step 1

Define the user and system contract

A mobility application must let travelers choose a route and operations authors draft geofences through Mappls iOS UI surfaces without treating presentation, callback, deep-link opening, review, or publication as the same fact. Record the region, data freshness, latency budget, privacy purpose, credential owner, and fallback before choosing an SDK or endpoint.

Step 2

Freeze the evidence and adapter seams

Select exact entitled MapplsDirectionUI and MapplsGeofenceUI releases from reviewed source guides, keep their native types behind separate translators, and label the host fixture envelope as application-owned rather than a provider wire contract.

App Widgets & Deep Links · SDK or product slice
<a
  href="https://mappls.com/MMI000"
  target="_blank"
  rel="noopener noreferrer"
>
  Open this place in Mappls
</a>
Step 3

Own intent, revision, and presentation generation

Persist bounded direction destination/profile or geofence purpose/scope/policy as the aggregate draft, increment one generation for each editor presentation, and reject callbacks from disposed controllers or superseded draft revisions.

Step 4

Complete the direction evidence ladder

Validate route revision, candidate count, selected index, destination, and profile; require deliberate traveler selection; record navigation request separately from the target adapter acknowledgement; and use only the documented Mappls HTTPS/app-URI navigation shape for recovery.

Step 5

Complete the geofence review boundary

Normalize a bounded circle or polygon, reject invalid coordinates, radius, duplicate or crossing vertices, hash the canonical geometry, bind it to purpose and policy, and require a reviewer other than the draft author.

Step 6

Commit and recover exactly once in effect

Require an idempotency key and expected aggregate version, atomically store snapshot, processed-command receipt, immutable audit event, and outbox entry, then prove restart recovery without persisting controllers, delegates, route objects, layers, credentials, or opaque payloads.

Step 7

Qualify hostile paths on devices

Exercise installed and missing apps, broken universal-link association, offline state, UI unavailability, cancellation, duplicate and late callbacks, invalid indexes, geometry attacks, process death, accessibility focus restoration, target timeout, entitlement drift, upgrade, and rollback.

Step 8

Prove the production behavior

Automate the happy path and every named failure. The release is ready only when direction return, route selection, handoff request, and target acceptance are independently evidenced; the fallback emits only the documented navigation hosts and never claims a return callback; stale or opaque native results change no state; geofence approval remains an application draft until an authoritative publication contract exists; self-review and stale review are rejected; restart and replay preserve one aggregate truth. Capture provider request identity without logging credentials or unnecessary precise location.

Recovery design

Failure modes you must exercise

native UI is unavailable and the app link is not installed

Fail fast with a typed, user-safe outcome and preserve the original request identity.

a callback arrives from an old presentation or route revision

Keep the last verified state, mark freshness honestly, and retry only within the documented idempotency boundary.

the route index or intent differs from the active draft

Reconcile durable local and provider evidence before declaring success or issuing a compensating command.

circle or polygon violates geometry policy

Reconcile durable local and provider evidence before declaring success or issuing a compensating command.

navigation target times out after request

Reconcile durable local and provider evidence before declaring success or issuing a compensating command.

no authoritative entitled geofence publication contract is selected

Reconcile durable local and provider evidence before declaring success or issuing a compensating command.

Never turn uncertainty into success

Timeout after a stateful command is an unknown outcome. Query by provider/idempotency identity or wait for authoritative events; do not blindly retry a new command.

Acceptance criteria

Definition of done

direction return, route selection, handoff request, and target acceptance are independently evidencedthe fallback emits only the documented navigation hosts and never claims a return callbackstale or opaque native results change no stategeofence approval remains an application draft until an authoritative publication contract existsself-review and stale review are rejectedrestart and replay preserve one aggregate truth

iOS production checks

Package and binary versions belong to the same release lineSecrets are not recoverable from the app bundleInfo.plist purpose strings match actual collectionDelegates, observers, and background sessions terminate cleanly
Grounded implementation

Continue from source, contracts, and a full app

These links resolve to repository-derived evidence; unsupported package names and endpoints are not filled in from guesswork.

Study the complete iOS direction planning and navigation handoff state machine
Tutorial complete

Run it, break it, then observe it

Start with fixture credentials, execute the failure plan, and use request logs, usage, webhook evidence, and operational metrics before promoting traffic.