如何从Brother的IOS上找到打印机？

Question

我发现打印机从iPad设置打印可以找到我的兄弟打印机。

但是当我尝试代码时，我得到了空的设备列表，我不知道为什么。

我不熟悉斯威夫特。我只是尝试一下官方文档中的示例代码。https://support.brother.com/g/s/es/htmldoc/mobilesdk/guide/discover-printer.html

这是我的代码：

func getPrinter() {

    let printerManager = BRPtouchNetworkManager()

     printerManager.setPrinterName("Brother QL-720NW")
     printerManager.startSearch(5)

    printerManager.getPrinterNetInfo()

    print("start")
    let testFind = YourClass()

    print("1")
    testFind.startSearchWiFiPrinter()
    testFind.didFinishSearch(printerManager)
    print("2")
  }

class YourClass: NSObject, BRPtouchNetworkDelegate {
    private var networkManager: BRPtouchNetworkManager?

    func startSearchWiFiPrinter() {
      print("3")
      let manager = BRPtouchNetworkManager()
      manager.delegate = self
      manager.startSearch(5)
      self.networkManager = manager
    }

    // BRPtouchNetworkDelegate
    func didFinishSearch(_ sender: Any!) {
      print("4")
      guard let manager = sender as? BRPtouchNetworkManager else {
        print("5")
        return
      }
      guard let devices = manager.getPrinterNetInfo() else {
        print("6")
        return
      }
      print(devices)
      print("7")
      for deviceInfo in devices {
        print("8")
        if let deviceInfo = deviceInfo as? BRPtouchDeviceInfo {
          print("Model: \(deviceInfo.strModelName), IP Address: \(deviceInfo.strIPAddress)")
        }
      }
    }
  }

我调用函数getPrinter()，这是我的打印日志：

​

​

Answer 1

SDK文档给出了两个方法的示例实现：

func startSearchWiFiPrinter() {}

和

func didFinishSearch(_ sender: Any!) {}

在要执行搜索的类中，必须实现这些。您还需要声明类来参加协议BRPtouchNetworkDelegate。最后一件事是拥有一个能够容纳网络管理器的属性(在行：private var networkManager: BRPtouchNetworkManager?中完成)

但是，您不应该单独调用"didFinishSearch“方法。当您调用startSearchWiFiPrinter时，搜索就开始了，BRPtouchNetworkManager实例本身也调用了didFinishSearch方法。它能够这样做，因为您在行：manager.delegate = self中设置了委托。

你不应该需要两个类来完成这个任务。您也不应该使用两个BRPtouchNetworkManager实例。

尝尝这个。记住，作为startSearchWiFiPrinter参数的数字意味着搜索在几秒钟内会持续多久。

class EXAMPLEClass: NSObject, BRPtouchNetworkDelegate {
    private var networkManager: BRPtouchNetworkManager?
    func getPrinter() {
         self.startSearchWiFiPrinter()
    }

    func startSearchWiFiPrinter() {
      let manager = BRPtouchNetworkManager()
      manager.delegate = self
      manager.setPrinterName("Brother QL-720NW")
      manager.startSearch(5)
      self.networkManager = manager
    }

    // BRPtouchNetworkDelegate
    func didFinishSearch(_ sender: Any!) {
      print("4")
      guard let manager = sender as? BRPtouchNetworkManager else {
        print("5")
        return
      }
      guard let devices = manager.getPrinterNetInfo() else {
        print("6")
        return
      }
      print(devices)
      print("7")
      for deviceInfo in devices {
        print("8")
        if let deviceInfo = deviceInfo as? BRPtouchDeviceInfo {
          print("Model: \(deviceInfo.strModelName), IP Address: \(deviceInfo.strIPAddress)")
        }
      }
    }
  }