ios - 如何访问扩展中的UIButton？

Question

我是新手，请耐心等待。
我试图在主ViewController类之外的扩展中启用按钮。基本上，我只希望按钮在用户的蓝牙天线打开且正在工作的情况下才能工作。看起来像这样:

extension UIViewController: CBCentralManagerDelegate {

        //function called after manager is initialized, state of bluetooth on manager
        public func centralManagerDidUpdateState(_ central: 
CBCentralManager) {
            switch central.state {
                  case .unknown:
                    print("central.state is .unknown")
                  case .resetting:
                    print("central.state is .resetting")
                  case .unsupported:
                    print("central.state is .unsupported")
                  case .unauthorized:
                    print("central.state is .unauthorized")
                  case .poweredOff:
                    print("central.state is .poweredOff")
                  case .poweredOn:
                    print("central.state is .poweredOn")
                    connectButton.isEnabled = true
               
                  @unknown default:
                    print("central.state is .unknown")
            }
        
        }
}

如您所见，在.poweredOn情况下，我尝试启用我的按钮。但是，我不断收到“使用 Unresolved 标识符”错误。这是我声明按钮的方式:

class ViewController: UIViewController {


    @IBOutlet var voltageOut: UILabel!
    @IBOutlet public var connectButton: UIButton!

    override func viewDidLoad() {
        super.viewDidLoad()
        connectButton.isEnabled = false
        //initializing manager
        myVars.centralManager = CBCentralManager(delegate: self, queue: nil)
    }


    @IBAction func connectButton(_ sender: Any) {
        connect()
    }
}

我已经搜寻了好几个小时，尝试将类设为打开/公开状态，当我在类外声明按钮时，覆盖函数中的'connectButton.isEnabled = false'导致了另一个错误。如何在主ViewController类之外访问按钮？

Answer 1

您正在扩展基类UIViewController，而不是扩展子类ViewController。基类对您在子类中声明的属性一无所知。
更改

extension UIViewController: CBCentralManagerDelegate {

至

extension ViewController: CBCentralManagerDelegate {