In an iOS ride service feature with route guidance, fare calculation, and live location updates, the inheritance hierarchy has gotten complicated. With protocol-oriented design, how would you compose the shared capabilities and the per-service differences?
Instead of an inheritance hierarchy, one small protocol per capability, like location streaming, fare calculation, and route guidance. Service types like taxi or designated driver adopt only the protocols they need, and shared implementation goes into protocol extension defaults or a concrete object owned as a property.
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