我不确定为什么这段代码无法构建并且错误消息看起来很神秘。
代码:
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:
“由方法“centralManager(:didDiscoverPeripheral:advertisementData:RSSI:)”提供的 Objective-C 方法“centralManager:didDiscoverPeripheral:advertisementData:RSSI:”与可选的要求方法“centralManager(:didDiscoverPeripheral) 冲突:advertisementData:RSSI :)' 在协议(protocol) 'CBCentralManagerDelegate' 中”
通过查看 CoreBluetooth 文档,似乎方法语法和参数是正确的,并且参数的可选性直接从规范表中复制: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 测试版
当我将函数声明更改为:
func centralManager(central: CBCentralManager, didDiscoverPeripheral peripheral: CBPeripheral, advertisementData advertisementData: [NSObject : AnyObject], RSSI RSSI: NSNumber)
我仍然遇到相同的构建错误。
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"); } }
最佳答案
感谢您的建议;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。
注意可选值和数据类型的不同用法。
(XCode 6) 错误:NSError!
对比 (XCode 7) 错误: NSError?
(XCode 6) advertisementData : [NSObject : AnyObject]!
vs. (XCode 7) advertisementData [String : AnyObject]
适用于 XCode 7 beta 的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?) {}
希望对遇到同样问题的其他人有所帮助!
关于ios - didDiscoverPeripheral "fail to build"错误,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/31576864/