iOS swift 将 BLE 数据传递给单独的 class 函数

Question

我确定这已在某处得到解答，但我不确定要搜索什么。我正处于一个简单的 BLE iOS 应用程序的早期阶段，并试图弄清楚如何将传入的 BLE 数据传输到一个单独的函数。来自 BLE 的数据正在转换成数组，但我相信不可能将其发送到不同的函数。我尝试将其作为字符串发送，但似乎无法将字符串分解为数组。

有人可以建议将传入的 BLE 数据传输到单独的函数的最有效方法是什么吗？

这是func peripheral(_ peripheral: CBPeripheral, didUpdateValueFor characteristic: CBCharacteristic, error: Error?)中的代码：

// Decode the incoming BLE into bytes
let data2 = characteristic.value
let count = (data2?.count)! / MemoryLayout<UInt8>.size
var array = [UInt8](repeating: 0, count: count)
data?.copyBytes(to: &array, count:count * MemoryLayout<UInt8>.size)
// Transfer the incoming BLE data to a sepurate class to decode
var stringFromData = String(data: characteristic.value!, encoding: String.Encoding.ascii)
// How to transfer the incoming BLE data to a sepurate class?
BLE_Element_One_DataExtract_class.DummyFunc(_IncomingElementOneData: stringFromData!, _IncomingUUID: characteristic.uuid)

print("BLE incoming data in an array = ")
let x=0
for x in array
{
    print("\(array) BLE data \n")
    
}

// Separate class and function to decode the BLE data and store in the MVVM
// This code does not work, as it does not treat the incoming data as a string 

class BLE_Element_One_DataExtract
{
    func DummyFunc(_IncomingElementOneData:String, _IncomingUUID:CBUUID)
    {
        let data
        let data2 = _IncomingElementOneData
        let count = (data2?.count)! / MemoryLayout<UInt8>.size
        var array = [UInt8](repeating: 0, count: count)
        data?.copyBytes(to: &array, count:count * MemoryLayout<UInt8>.size)
        
        print("data is -> : ", terminator : "")
        
        if(_IncomingUUID.isEqual(CBUUIDs.ECHO_DISPLAY_ELEMENT_STATUS_ONE_UUID_CHAR))
        {
            print ("Found ECHO_DISPLAY_ELEMENT_STATUS_ONE_UUID_CHAR inner func")
            // BLE_Element_One_DataExtract(?? send data string ??)
        }
    }
}

Answer 1

我想你想将 characteristic.value（它的类型为 Data?）转换为 String.

类型的变量

你提到你想要 String，但在代码中你也使用 [UInt8]，所以我不确定我是否理解你想要做什么。

您已经实现了使用 func peripheral(_ peripheral: CBPeripheral, didUpdateValueFor characteristic: CBCharacteristic, error: Error?) 侦听更新并从 characteristic.value 读取传入数据，因此仍然需要将数据转换为所需的类型。

转换示例（如果characteristic.value为nil，或转换错误，结果将为空字符串）：

let data = characteristic.value ?? Data()
let stringValue = String(data: data, encoding: .utf8) ?? ""
// pass stringValue where you need it

您还可以使用类型 Data?“按原样”将数据传递给目标函数，因此目标函数的工作将决定如何处理它：

func peripheral(_ peripheral: CBPeripheral, didUpdateValueFor characteristic: CBCharacteristic, error: Error?) {
    DataDestinationClass.doSomething(data: characteristic.value, uuid: characteristic.uuid)
}

class DataDestinationClass {
    static func doSomething(data: Data?, uuid: CBUUID) {
        let stringValue = String(data: data ?? Data(), encoding: .utf8) ?? ""
        print("MYLOG: stringValue = '\(stringValue)'")
    }
}

这里是将收到的 characteristic.value 放入文本字段的示例：https://github.com/alexanderlavrushko/BLEProof-collection/blob/5cbb089dbfed42cfb8aad0db236a376ff1cce620/iOS/BLEProofCentral/BLEProofCentral/BLECentralViewController.swift#L295

Answer 2

“从 BLE 传入的数据正在转换为数组，但我认为不可能将其发送到不同的函数。”

不，将数据数组传递给另一个函数很简单：

// Your code
var array = [UInt8](repeating: 0, count: count)
data?.copyBytes(to: &array, count:count * MemoryLayout<UInt8>.size)

// At this point you can simply pass your array to another
// function (which could be in a different class)
otherClass.processData(data: array)

接收数据的 class / 函数可能看起来像这样：

class OtherClass {
    func processData(data: [UInt8]) {
        // Do something with your data
    }
}

iOS swift 将 BLE 数据传递给单独的 class 函数

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