Swift 快速继承问题泛型
我需要能够调用泛型类型的方法,以便能够从SensorDescBattery获得恒定的SENSOR_ID值。 我在调用getSensorId()时使用的方法 但是,当我使用泛型类型sensorDescBattery调用该函数时,它会要求我为方法getSensorId()提供一个参数,但它没有参数 我已经在下面介绍了课程:Swift 快速继承问题泛型,swift,generics,inheritance,Swift,Generics,Inheritance,我需要能够调用泛型类型的方法,以便能够从SensorDescBattery获得恒定的SENSOR_ID值。 我在调用getSensorId()时使用的方法 但是,当我使用泛型类型sensorDescBattery调用该函数时,它会要求我为方法getSensorId()提供一个参数,但它没有参数 我已经在下面介绍了课程: class SensorDescBattery: SensorDescSingleValue { let SENSOR_ID : UInt64 = 0x0000000
class SensorDescBattery: SensorDescSingleValue {
let SENSOR_ID : UInt64 = 0x0000000000000001 { get{ return SENSOR_ID}}
var sensorIdentifier: Int64 = 0x0000000000000001
var timestamp: UInt64
var batteryPercent: Float
var isCharging: Bool
var isUsbCharge: Bool
var isAcCharge: Bool
init(timestamp: UInt64, batteryPercent: Float, isCharging: Bool, isUsbCharge: Bool, isAcCharge: Bool) {
self.timestamp = timestamp
self.batteryPercent = batteryPercent;
self.isCharging = isCharging;
self.isUsbCharge = isUsbCharge;
self.isAcCharge = isAcCharge;
}
/*
override keyword always needed here
*/
required init(sensorData: SensorUploadSensorData) {
self.timestamp = sensorData.recordTime
self.batteryPercent = sensorData.valueFloat[0]
self.isCharging = sensorData.valueBool[0]
self.isUsbCharge = sensorData.valueBool[1]
self.isAcCharge = sensorData.valueBool[2]
}
init (battery: UIDevice, timestamp: UInt64) {
self.timestamp = timestamp
self.batteryPercent = battery.batteryLevel
if UIDeviceBatteryState.Charging.rawValue == 3{
self.isCharging = true
self.isUsbCharge = false
self.isAcCharge = true
}
else {
self.isCharging = false
self.isUsbCharge = false
self.isAcCharge = false
}
}
/*
Override keyword needed
*/
func toProtoSensor() -> SensorUploadSensorData {
let builder = SensorUploadSensorData.builder()
/*
Always set the record time! also it's important to put the values in the
array in the same exact order as in Android
*/
builder.recordTime = timestamp
builder.valueFloat = [self.batteryPercent]
builder.valueBool = [self.isCharging, self.isUsbCharge, self.isAcCharge]
return builder.build()
}
func getSensorId() -> UInt64 {
return SENSOR_ID;
}
func getValue() -> Float {
return self.batteryPercent;
}
}
下面是QueryNumSingleValue类:
类QueryNumSingleValue{
var List : Array<SensorUploadSensorData>
func getSensorID() -> UInt64{
fatalError("Must Override")
}
init(from timestamp_from :UInt64,to timestamp_to : UInt64){
let vm = NervousVM()
self.List = vm.retrieve(0, fromTimeStamp: 0, toTimeStamp: 0)
self.List = vm.retrieve(getSensorID(), fromTimeStamp: timestamp_from, toTimeStamp: timestamp_to)
if(containsReading()){
println("retreived list of size /(getCount())")
}
}
func getCount() -> Int
{
return List.count
}
}
我想做的是:
class SensorQueriesBattery<T : SensorDescBattery> : QueryNumSingleValue<SensorDescBattery>{
override func getSensorID() -> UInt64 {
return T.getSensorId()
}
}
class SensorQueriesBattery:QueryNumSingleValue{
重写函数getSensorID()->UInt64{
返回T.getSensorId()
}
}
但它不让我。
如何继续?编译器要求您提供一个参数,因为在这部分代码中,您使用的是类而不是对象来调用方法(并且方法不是静态的):
override func getSensorID() -> UInt64 {
return T.getSensorId()
}
你应该多读一些关于
使您的代码与您的方法一起工作的一种方法是:
class SensorQueriesBattery<T : SensorDescBattery> : QueryNumSingleValue{
var batteryDesc: T
init(desc:T) {
self.batteryDesc = desc
}
override func getSensorID() -> UInt64 {
return self.batteryDesc.getSensorId()
}
}
class SensorQueriesBattery:QueryNumSingleValue{
var batteryDesc:T
初始(描述:T){
self.batteryDesc=desc
}
重写函数getSensorID()->UInt64{
返回self.batteryDesc.getSensorId()
}
}
您必须在init中传递泛型对象才能调用方法
getSensorId()
OP可以对泛型进行更多的阅读,这是一个困扰我所见过的所有泛型实现(C++、Java、Swift)的问题。我尝试了您的方法,所有行都给出了错误QueryNumSingleValue需要@LoveMeow中的泛型类型您是否已将QueryNumSingleValue
类的定义更改为泛型?如果是这样的话,你必须在继承'QueryNumSingleValue'时设置泛型。我对它做了一些调整,就像你说的问题不是创建一个对象!
class SensorQueriesBattery<T : SensorDescBattery> : QueryNumSingleValue{
var batteryDesc: T
init(desc:T) {
self.batteryDesc = desc
}
override func getSensorID() -> UInt64 {
return self.batteryDesc.getSensorId()
}
}