因此，我正在迁移到iOS10，但是我还需要我的代码才能在iOS9上运行。我正在使用CoreBluetooth和CBCentralManagerDelegate。我可以让我的代码适用于iOS10，但是我也需要后备才能适用于iOS9。
func centralManagerDidUpdateState(_ central: CBCentralManager) {
if #available(iOS 10.0, *) {
switch central.state{
case CBManagerState.unauthorized:
print("This app is not authorised to use Bluetooth low energy")
case CBManagerState.poweredOff:
print("Bluetooth is currently powered off.")
case CBManagerState.poweredOn:
print("Bluetooth is currently powered on and available to use.")
default:break
}
} else {
// Fallback on earlier versions
switch central.state{
case CBCentralManagerState.unauthorized:
print("This app is not authorised to use Bluetooth low energy")
case CBCentralManagerState.poweredOff:
print("Bluetooth is currently powered off.")
case CBCentralManagerState.poweredOn:
print("Bluetooth is currently powered on and available to use.")
default:break
}
}
}
我得到错误：
Enum case 'unauthorized' is not a member of type 'CBManagerState'
在线上：
case CBCentralManagerState.unauthorized:
以及.poweredOff和.poweredOn。
有什么想法可以让我在两种情况下都能正常工作吗？
我就此事与苹果公司联系，并得到了以下答复（措辞）。
由于swift的变化性质，上述实现是不可能的，但是您可以使用枚举的rawValue，因为两个类之间的状态相同。因此，以下内容目前适用：
func centralManagerDidUpdateState(_ central: CBCentralManager) {
if #available(iOS 10.0, *) {
switch central.state{
case CBManagerState.unauthorized:
print("This app is not authorised to use Bluetooth low energy")
case CBManagerState.poweredOff:
print("Bluetooth is currently powered off.")
case CBManagerState.poweredOn:
print("Bluetooth is currently powered on and available to use.")
default:break
}
} else {
// Fallback on earlier versions
switch central.state.rawValue {
case 3: // CBCentralManagerState.unauthorized :
print("This app is not authorised to use Bluetooth low energy")
case 4: // CBCentralManagerState.poweredOff:
print("Bluetooth is currently powered off.")
case 5: //CBCentralManagerState.poweredOn:
print("Bluetooth is currently powered on and available to use.")
default:break
}
}
}
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