How can the sequential execution of three asynchronous operations be implemented?

To perform three asynchronous operations sequentially in iOS, you can use several approaches:

1. Completion handlers — call the next operation in the completion of the previous one:

operation1 { result1 in
    operation2 { result2 in
        operation3 { result3 in
            // All operations are completed
        }
    }
}

2. Combine — use a chain of Publishers for sequential execution.

3. async/await (if available in your Swift version):

func performOperations() async {
    let result1 = await operation1()
    let result2 = await operation2()
    let result3 = await operation3()
    // All operations are executed sequentially
}

The choice depends on your Swift version and application architecture.