[英]iOS BLE CentralManager didFailToConnect to peripheral not being called
[英]BLE Peripheral delegate not called
我最近从 Swift 3 升级到 Swift 4,从 iOS 10.3.3 升级到 iOS 11.1。
我正在开发一个使用 BLE 进行双向通信的应用程序。 工作流程如下:
我的代码在更新之前运行良好,但现在不是。 在第 4 步结束时,我执行以下行:
peripheral.writeValue(encryptedData!, for: characteristic, type: .withResponse)
这应该调用以下委托方法,但它没有:
public func peripheral(_ peripheral: CBPeripheral, didWriteValueFor descriptor: CBDescriptor, error: Error?) {
print("Did Write")
print("Error=\(error?.localizedDescription)")
}
它还应该(并且正在调用)外围设备上的以下委托方法,但它没有:
public func peripheralManager(_ peripheral: CBPeripheralManager, didReceiveWrite requests: [CBATTRequest]) {
print("did receive write request")
}
服务和特性设置如下:
let prefs = Preferences()
let strServiceUUID = prefs.GetString(key: Preferences.PREF_IDENTITY_SERVICE_UUID, defaultVal: "")!
let strCharacteristicUUID = prefs.GetString(key: Preferences.PREF_IDENTITY_CHARACTERISTIC_UUID, defaultVal: "")!
print("ServiceUUID=\(strServiceUUID)")
print("CharacteristicUUID=\(strCharacteristicUUID)")
mServiceUUID = CBUUID(string: strServiceUUID)
mCharacterUUID = CBUUID(string: strCharacteristicUUID)
mCBBluetoothServices = CBMutableService(type: mServiceUUID, primary: true)
//lets configure the data we want to advertise for
var characteristics : [CBCharacteristic] = []
//let strData : String = "933911"
//let data = strData.data(using: .utf8)
let cbProperties: CBCharacteristicProperties = [.read, .write, .notify]
let cbPermissions: CBAttributePermissions = [.readable, .writeable]
mIdentityObjectCharacteristic = CBMutableCharacteristic(type: mCharacterUUID,
properties: cbProperties,
value: nil,
permissions: cbPermissions)
characteristics.append(mIdentityObjectCharacteristic)
mCBBluetoothServices.characteristics = characteristics
mCBPeripheralManager.add(mCBBluetoothServices)
我不确定为什么升级操作系统和 Swift 版本会破坏您的代码,但是,在我看来,您可能使用了错误的委托方法?
尝试使用这个
func peripheral(CBPeripheral, didWriteValueFor: CBCharacteristic, error: Error?)
而不是这个
func peripheral(CBPeripheral, didWriteValueFor: CBDescriptor, error: Error?)
斯威夫特 4
对于任何类型的更新特性(例如读/写特性),将调用didUpdateValueFor
委托。
因此,首先检查以下委托方法。
func peripheral(_ peripheral: CBPeripheral, didUpdateValueFor characteristic: CBCharacteristic, error: Error?) {
print("didUpdateValueForChar", characteristic)
if let error1 = error{
alertMSG(titleString: "Error", subTitleString: "Found error while read characteristic data, Plase try again", buttonTitle: "OK")
print(error1)
}
else{
print("Update Characteristic: ", characteristic)
}
}
func peripheral(_ peripheral: CBPeripheral, didWriteValueFor characteristic: CBCharacteristic, error: Error?) {
print("Write Characteristic :", characteristic)
}
斯威夫特 5
iOS 13
要检查的一些事项:
delegate
设置为符合CBPeripheralDelegate
协议的控制器(这也应该是需要实现peripheral(_:didWriteValueFor:error:)
方法的控制器)。.withoutResponse
写入类型。peripheral(_:didWriteValueFor:error:)
。 确保您正在实施正确的。
writeValue(_:for:type:)
: func writeValue(_ data: Data, for characteristic: CBCharacteristic, type: CBCharacteristicWriteType)
peripheral(_:didWriteValueFor:error:)
func peripheral(_ peripheral: CBPeripheral, didWriteValueFor characteristic: CBCharacteristic, error: Error?)
writeValue(_:for:)
func writeValue(_ data: Data, for descriptor: CBDescriptor)
peripheral(_:didWriteValueFor:error:)
func peripheral(_ peripheral: CBPeripheral, didWriteValueFor descriptor: CBDescriptor, error: Error?)
很容易混淆 2 组写入和委托方法。
由于您正在使用:
peripheral.writeValue(encryptedData!, for: characteristic, type: .withResponse)
写和委托对的代码应该是这样的:
class BluetoothController: CBCentralManagerDelegate, CBPeripheralDelegate {
...
func writeSomething(to characteristic: CBCharacteristic, of peripheral: CBPeripheral) {
let something = "1234"
NSLog("Writing \(something) to \(characteristic.uuid.uuidString)")
peripheral.delegate = self // <===== You may have forgotten this?
peripheral.writeValue(something.data(using: .utf8)!,
for: characteristic,
type: .withResponse)
}
...
func peripheral(_ peripheral: CBPeripheral, didWriteValueFor characteristic: CBCharacteristic, error: Error?) {
if error != nil {
NSLog("Write error: \(String(describing: error))")
} else {
NSLog("Wrote value to \(characteristic.uuid.uuidString)")
}
}
}
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