didDiscoverPeripheral“无法构建”错误-Java 学习之路

我不确定为什么这段代码无法构建，错误消息似乎非常神秘 .

码：

var centralManager: CBCentralManager!;
var nrf8001Peripheral: CBPeripheral!;

override func viewDidLoad() {
    super.viewDidLoad()
    // Do any additional setup after loading the view, typically from a nib.

    // initialize centralManager
    self.centralManager = CBCentralManager(delegate: self, queue: nil);

    // start scanning for device
    self.centralManager.scanForPeripheralsWithServices([UART_SERVICE_UUID], options:nil);
}

func centralManager(central: CBCentralManager!, didDiscoverPeripheral peripheral: CBPeripheral!, advertisementData advertisementData: [NSObject : AnyObject]!, RSSI RSSI: NSNumber) {

            //print out the name of the scanned peripheral
            print("Discovered \(peripheral.name)")

            //print out the UUID of the scanned peripheral
            print("NSUUID string \(peripheral.identifier.UUIDString)")

            //stop scanning when found
            self.centralManager.stopScan()

            //connect when found
            self.centralManager.connectPeripheral(peripheral, options:nil);
}

我从XCode编译器收到的错误是：

“Objective-C方法'centralManager:didDiscoverPeripheral:advertisementData:RSSI:'由方法'centralManager提供（：didDiscoverPeripheral：advertisementData：RSSI :) ' conflicts with optional requirement method ' centralManager（：didDiscoverPeripheral：advertisementData：RSSI :) ' in protocol ' CBCentralManagerDelegate'”

通过查看CoreBluetooth文档，似乎方法语法和参数是正确的，参数的可选性直接从规格表中复制：https://developer.apple.com/library/ios/documentation/CoreBluetooth/Reference/CBCentralManagerDelegate_Protocol/#//apple_ref/occ/intfm/CBCentralManagerDelegate/centralManager:didDiscoverPeripheral:advertisementData:RSSI：

任何帮助，将不胜感激！谢谢

根据评论：

使用XCode 7 beta
当我将函数声明更改为：

func centralManager（中央：CBCentralManager，didDiscoverPeripheral peripheral：CBPeripheral，advertisementData advertisementData：[NSObject：AnyObject]，RSSI RSSI：NSNumber）

我仍然得到相同的构建错误 .

我的centralManagerDidUpdateState：方法是

func centralManagerDidUpdateState(central: CBCentralManager) {

print("centralManagerDidUpdateState:");

switch (central.state) {

    case .PoweredOff:
        print("CBCentralManagerStatePoweredOff");

    case .Resetting:
        print("CBCentralManagerStateResetting");

    case .PoweredOn:
        print("CBCentralManagerStatePoweredOn");

    //scan for peripheral devices
    self.centralManager.scanForPeripheralsWithServices([UART_SERVICE_UUID], options:nil);

    case .Unauthorized:
        print("CBCentralManagerStateUnauthorized");

    case .Unsupported:
        print("CBCentralManagerStateUnsupported");

    default:
        print("CBCentralManagerStateUnknown");
    }
}

1 回答

感谢你的建议;我最终通过XCode 7文档找到了答案 . 以下函数的XCode 6语法如下：

func centralManagerDidUpdateState(central: CBCentralManager!) {}

func centralManager(central: CBCentralManager!, didDiscoverPeripheral peripheral: CBPeripheral!, advertisementData advertisementData: [NSObject : AnyObject]!, RSSI RSSI: NSNumber) {}

func centralManager(central: CBCentralManager!, didConnectPeripheral peripheral: CBPeripheral!) {}

func centralManager(central: CBCentralManager!, didDisconnectPeripheral peripheral: CBPeripheral!, error: NSError!) {}

func peripheral(peripheral: CBPeripheral!, didDiscoverServices error: NSError!) {}

func peripheral(peripheral: CBPeripheral!, didDiscoverCharacteristicsForService service: CBService!, error: NSError!) {}

func peripheral(peripheral: CBPeripheral!, didUpdateNotificationStateForCharacteristic characteristic: CBCharacteristic!, error: NSError!) {}

func peripheral(peripheral: CBPeripheral!, didUpdateValueForCharacteristic characteristic: CBCharacteristic!, error: NSError!) {}

但是，这些函数将与XCode 7 CoreBluetooth库声明冲突 .

请注意 optionals 以及 data types 的不同用法 .

（XCode 6） error:NSError! vs. （XCode 7） error:NSError?

（XCode 6） advertisementData : [NSObject : AnyObject]! vs. （XCode 7） advertisementData [String : AnyObject]

XCode 7 beta的相应函数声明实际上如下：

func centralManagerDidUpdateState(central: CBCentralManager) {}

func centralManager(central: CBCentralManager, didDiscoverPeripheral peripheral: CBPeripheral, advertisementData: [String : AnyObject], RSSI: NSNumber) {}

func centralManager(central: CBCentralManager, didConnectPeripheral peripheral: CBPeripheral) {}

func centralManager(central: CBCentralManager, didFailToConnectPeripheral peripheral: CBPeripheral, error: NSError?) {}

func peripheral(peripheral: CBPeripheral, didDiscoverServices error: NSError?) {}

func peripheral(peripheral: CBPeripheral, didDiscoverCharacteristicsForService service: CBService, error: NSError?) {}

func peripheral(peripheral: CBPeripheral, didUpdateValueForCharacteristic characteristic: CBCharacteristic, error: NSError?) {}

func peripheral(peripheral: CBPeripheral, didUpdateNotificationStateForCharacteristic characteristic: CBCharacteristic, error: NSError?) {}

func centralManager(central: CBCentralManager, didDisconnectPeripheral peripheral: CBPeripheral, error: NSError?) {}

希望这对有同样问题的其他人有帮助！

回复于 2024-05-04T20:18:36+08:00

didDiscoverPeripheral“无法构建”错误

1 回答

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