来自动态创建的按钮的 Swift 3 IOS 访问类方法

Posted 2023-03-15

【中文标题】来自动态创建的按钮的 Swift 3 IOS 访问类方法

【英文标题】：Swift 3 IOS Access Class Method from dynamically created button

【发布时间】：2017-05-01 13:16:50

【问题描述】：

我正在尝试从代码生成的按钮触发方法...

我收到错误：类型值：SBSbarcode 选择器没有成员 StartScanning。

此按钮如何访问上述方法？

任何帮助将不胜感激。

class scanViewController: UIViewController 

override func viewDidLoad()

    super.viewDidLoad()
    setupManualScanner()




func setupManualScanner() 

    // Scandit Barcode Scanner Integration
    // The following method calls illustrate how the Scandit Barcode Scanner can be integrated
    // into your app.

    // Create the scan settings and enabling some symbologies
    let settings = SBSScanSettings.default()

    let symbologies: Set<SBSSymbology> = [.code39, .code128]
    settings.settings(for: .code128).activeSymbolCounts =  [11,15,16,17, 18]
    settings.settings(for: .code39).activeSymbolCounts =  [10, 14]

    for symbology in symbologies
    
        settings.setSymbology(symbology, enabled: true)
    

    let guiOptions = SBSGuiStyle.laser

    // Create the barcode picker with the settings just created
    let barcodePicker = SBSBarcodePicker(settings:settings)

    // Add the barcode picker as a child view controller
    addChildViewController(barcodePicker)
    view.addSubview(barcodePicker.view)
    barcodePicker.didMove(toParentViewController: self)

    // Set the allowed interface orientations. The value UIInterfaceOrientationMaskAll is the
    // default and is only shown here for completeness.
    barcodePicker.allowedInterfaceOrientations = .portrait


    // Set custom options
    barcodePicker.overlayController.setVibrateEnabled(false)
    barcodePicker.overlayController.guiStyle=guiOptions


    let btn: UIButton = UIButton(frame: CGRect(x: 100, y: 400, width: 100, height: 50))
    btn.backgroundColor = UIColor.green
    btn.setTitle("Click to scan", for: .normal)
    btn.layer.cornerRadius = 10
    btn.layer.masksToBounds = true
    btn.addTarget(self, action: #selector(startManualScan), for: .touchUpInside)

    barcodePicker.view.addSubview(btn)

    // Set the delegate to receive scan event callbacks
    barcodePicker.scanDelegate = self
    barcodePicker.startScanning(inPausedState: true)




func startManualScan()

    self.barcodePicker.startScanning()

【问题讨论】：

是 StartScanning 还是 startScanning ？

startScanning，在上面的方法中效果很好但是在按钮动作中无法触发

self.barcodePicker 在哪里声明？

在上述方法中...但即使将按钮操作更改为：barcodePicker.startScanning() 也不起作用

问题是，我猜如何从 startManualScan 方法访问 setupManualScanner 方法的对象

【参考方案1】：

试试下面的代码：

类 scanViewController: UIViewController

 let barcodePicker = SBSBarcodePicker // declare here

override func viewDidLoad()

    super.viewDidLoad()
    setupManualScanner()


func setupManualScanner() 

    // Scandit Barcode Scanner Integration
    // The following method calls illustrate how the Scandit Barcode Scanner can be integrated
    // into your app.

    // Create the scan settings and enabling some symbologies
    let settings = SBSScanSettings.default()

    let symbologies: Set<SBSSymbology> = [.code39, .code128]
    settings.settings(for: .code128).activeSymbolCounts =  [11,15,16,17, 18]
    settings.settings(for: .code39).activeSymbolCounts =  [10, 14]

    for symbology in symbologies
    
        settings.setSymbology(symbology, enabled: true)
    

    let guiOptions = SBSGuiStyle.laser

    // Create the barcode picker with the settings just created
    barcodePicker = SBSBarcodePicker(settings:settings) // made change here

    //continue your code



func startManualScan()

    barcodePicker.startScanning()

【讨论】：

成功了！谢谢。加上 () --> 让barcodePicker = SBSBarcodePicker() // 在这里声明

欢迎 ..@Bubu