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Why is didSet called

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Hi, I have the following structure and I want to know why didSet is called when I set 22.

protocol SettingsModelProtocol {
    var number: Int { get set }
}

protocol SettingsServiceProtocol {
    var settingsModel: SettingsModelProtocol { get set }
    var number: Int { get set }
}

class SettingsService: SettingsServiceProtocol {
    var settingsModel: SettingsModelProtocol {
        didSet {
            print("didSet")
        }
    }

    var number: Int {
        get {
            settingsModel.number
        }
        set {
            settingsModel.number = newValue
        }
    }

    init(settingsModel: SettingsModelProtocol) {
        self.settingsModel = settingsModel
    }
}

struct EnglishSettingsModel: SettingsModelProtocol {
    var number = 20
}

struct GermanSettingsModel: SettingsModelProtocol {
    var number = 21
}

var englishSettings = EnglishSettingsModel()
var settingsService = SettingsService(settingsModel: englishSettings)

var germanSettings = GermanSettingsModel()

settingsService.settingsModel = germanSettings

settingsService.settingsModel.number = 22

2      

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