Have you worked with multi-step or complex data forms?

Yes, in iOS development, it is common to work with multi-step forms, for example, during user registration or filling out complex profiles. For convenience and to support logic, I use an approach with dividing into multiple screens or sections, and also apply patterns like MVVM for state management.

Example: if the form consists of several steps, you can store the data of each step in a separate model, and then combine them for submission to the server. This simplifies validation and navigation between steps.

struct StepOneData {
    var name: String
    var email: String
}

struct StepTwoData {
    var address: String
    var phone: String
}

class FormViewModel {
    var stepOneData = StepOneData(name: "", email: "")
    var stepTwoData = StepTwoData(address: "", phone: "")

    func validateStepOne() -> Bool {
        // Check name and email
        return !stepOneData.name.isEmpty && stepOneData.email.contains("@")
    }

    func validateStepTwo() -> Bool {
        // Check address and phone
        return !stepTwoData.address.isEmpty && stepTwoData.phone.count >= 10
    }

    func submit() {
        // Combine data and send
    }
}