Rork Max のネイティブアプリから HomeKit のアクセサリを操作する — 個人開発で踏んだ権限と状態同期の勘所

import HomeKit
 
final class HomeController: NSObject, HMHomeManagerDelegate {
    private let manager = HMHomeManager()
    private(set) var primaryHome: HMHome?
    var onReady: (() -> Void)?
 
    override init() {
        super.init()
        // delegate 登録より先に homes を読むと必ず空になる
        manager.delegate = self
    }
 
    func homeManagerDidUpdateHomes(_ mgr: HMHomeManager) {
        // ここで初めて家の構成が確定する
        primaryHome = mgr.primaryHome ?? mgr.homes.first
        onReady?()
    }
}

func powerCharacteristic(in home: HMHome) -> HMCharacteristic? {
    for accessory in home.accessories {
        for service in accessory.services where service.serviceType == HMServiceTypeLightbulb {
            for ch in service.characteristics where ch.characteristicType == HMCharacteristicTypePowerState {
                return ch
            }
        }
    }
    return nil   // 照明が一つも見つからない場合に備える
}

func setPower(_ on: Bool, _ ch: HMCharacteristic) async throws {
    try await ch.writeValue(on)          // 完了するまで待つ
    // 成功した場合のみ UI 状態を確定させる
    await MainActor.run { self.isOn = on }
}

extension HomeController: HMAccessoryDelegate {
    func accessory(_ accessory: HMAccessory,
                   service: HMService,
                   didUpdateValueFor ch: HMCharacteristic) {
        guard ch.characteristicType == HMCharacteristicTypePowerState else { return }
        if let value = ch.value as? Bool {
            Task { @MainActor in self.isOn = value }
        }
    }
}