Swift objective-c 中调用的协议无效

Question

我试图让这个 swift 协议在 objective c 文件中工作，但由于某种原因没有调用该函数。我希望在设备连接时调用 didConnect()，在设备断开连接时调用 didDisconnect()。我在 centralManager did connect 函数中设置断点并打印出来 delegate，它返回 nil

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

@objcMembers
class KestrelDeviceConnect: NSObject{


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

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

        }

    func centralManager(_ central: CBCentralManager, didDisconnectPeripheral peripheral: CBPeripheral, error: Error?) {
                self.kestrelIsConnected = false
                self.delegate?.didDisconnect()
            }
        }

在 objective c 文件中

    @interface ViewController ()<KestrelDeviceConnectDelegate> {
        KestrelDeviceConnect<KestrelDeviceConnectDelegate> *_kestrelVC;
      }
        @implementation ViewController

        -(void)viewDidLoad {
            [super viewDidLoad];
             _kestrelVC = [[KestrelDeviceConnect alloc]init];
             [_kestrelVC setDelegate:self];
        }
        -(void)didConnect{
            [[self connectToKestrelButton] setHidden:NO];

            }
}

Answer 1

您很可能会创建多个 KestrelDeviceConnect 对象。一个有 ViewController 的委托，并且可能还有另一个您实际用于任何事情的委托。

我怀疑你的意思是这一行，它创建了一个新的 KestrelDeviceConnect：

_kestrelVC = [[KestrelDeviceConnect alloc]init];

变成这样：

_kestrelVC = [KestrelDeviceConnect singleton];

Swift objective-c 中调用的协议无效

Swift protocol called in objective-c not working

protocols

objective-c

ios

swift