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To combine data transmission from multiple services during initialization on iOS, the following approaches and tools are often used:

• Combine — Apple's reactive framework that allows combining multiple asynchronous data streams using operators like zip, combineLatest.
• DispatchGroup — a class from GCD that enables tracking the completion of multiple asynchronous tasks and executing code after all have finished.
• Promise/Future libraries (e.g., PromiseKit) — facilitate combining multiple asynchronous operations and working with their results.

Example with Combine, combining two requests:

import Combine

let publisher1 = service1.fetchData()
let publisher2 = service2.fetchData()

let combined = Publishers.Zip(publisher1, publisher2)
    .sink { data1, data2 in
        // Processing data from both services
    }

This way, you can wait for results from multiple services and pass them together further.