Swift協議委托返回nil

Question

我在didConnect函數中設置了一個斷點以打印出委托的值，並且它返回為nil ，我不知道為什么

@objc protocol KestrelDeviceConnectDelegate {
    func didConnect()
    func didDisconnect()
}

@objcMembers
class KestrelDeviceConnect: NSObject{


    static let singleton = KestrelDeviceConnect()
    public weak var delegate: KestrelDeviceConnectDelegate?

func centralManager(_ central: CBCentralManager, didConnect peripheral: CBPeripheral) {
        self.isInitialReading = false
        self.kestrelIsConnected = true
        kestrelPeripheral.discoverServices(nil)
        delegate?.didConnect()

    }

}

在我的目標VC中的viewDidLoad中

_kestrelVC = [[KestrelDeviceConnect alloc]init];
[_kestrelVC setDelegate:self];

Answer 1

問題是初始化一個新的KestrelDeviceConnect實例，因此而不是_kestrelVC = [[KestrelDeviceConnect alloc]init]; 起作用的是_kestrelVC = [KestrelDeviceConnect singleton]