Swift 在快速删除线的pickerView中创建文本

我成功地将支票号码作为文本添加到pickerView中。但是我想要支票号码的文本，以前的支票号码是删除线的。可以将标签文本更改为删除线的代码不适用于pickerView中的项。在pickerView中会出现类似“1023{这是删除线}”的内容。有没有同时包含删除线字符和普通字符的字体？有什么想法吗

看来您需要在选择器视图中使用NSAttributedString对象

并使用UIPickerViewDelegate方法

如果实现该方法，将返回一个UIView对象，其中可以包含使用属性字符串的UILabel

如果这是我的问题，我可能会这样做：

func pickerView(_ pickerView: UIPickerView,
              viewForRow row: Int,
            forComponent component: Int,
             reusingView view: UIView?) -> UIView
{
    // create a mutable attributed string
    let attributeString: NSMutableAttributedString =  NSMutableAttributedString(string: "Your String here")
    // add strikethrough attribute to the whole string
    attributeString.addAttribute(NSStrikethroughStyleAttributeName, value: 2, range: NSMakeRange(0, attributeString.length))

    // set up a label
    let pickerLabel = UILabel(frame: CGRectMake(0, 0, 200, 21))
    pickerLabel.center = CGPointMake(160, 284)
    pickerLabel.textAlignment = NSTextAlignment.Center

    // and set the contents to the atributedString
    pickerLabel.attributedText = attributeString

    return pickerLabel
}

---

因此，您似乎需要在选择器视图中使用NSAttributedString对象

并使用UIPickerViewDelegate方法

如果实现该方法，将返回一个UIView对象，其中可以包含使用属性字符串的UILabel

如果这是我的问题，我可能会这样做：

func pickerView(_ pickerView: UIPickerView,
              viewForRow row: Int,
            forComponent component: Int,
             reusingView view: UIView?) -> UIView
{
    // create a mutable attributed string
    let attributeString: NSMutableAttributedString =  NSMutableAttributedString(string: "Your String here")
    // add strikethrough attribute to the whole string
    attributeString.addAttribute(NSStrikethroughStyleAttributeName, value: 2, range: NSMakeRange(0, attributeString.length))

    // set up a label
    let pickerLabel = UILabel(frame: CGRectMake(0, 0, 200, 21))
    pickerLabel.center = CGPointMake(160, 284)
    pickerLabel.textAlignment = NSTextAlignment.Center

    // and set the contents to the atributedString
    pickerLabel.attributedText = attributeString

    return pickerLabel
}

---

在上看到一个示例后，我最终使用了以下内容

只需将此函数添加到现有代码中即可。我发现必须包含每个组件，否则除了支票号码组件之外的组件将为空

 func pickerView(pickerView: UIPickerView, viewForRow row: Int, forComponent component: Int, reusingView view: UIView?) -> UIView {


    let myHueMax = 0.50
    let myPickerFontSize: CGFloat = 20.0
    print("component in lable == \(component)")

    var pickerLabel = view as! UILabel!
    var gHue = Double()


    if view == nil {  //if no label there yet
        pickerLabel = UILabel()
        //color the label's background

        var hue:CGFloat

        if component == payeeComponent  {

            hue = CGFloat(row)/CGFloat(payeesAlphbeticalArray.count)

        }else if component == categoryComponent {

            hue = CGFloat(row)/CGFloat(categoriesAlphbeticalArray.count)

        }else{

             hue = CGFloat(row)/CGFloat(checkNumbersAlphbeticalArray.count)

        }


        pickerLabel!.backgroundColor = UIColor(hue: hue, saturation: 1.0, brightness: 1.0, alpha: 1.0)
        print("hue in label color == \(hue)")

        gHue = Double(hue)
    }

if component == payeeComponent  {



    let titleData = payeesAlphbeticalArray[row]

    var myTitle: NSAttributedString

    if ( gHue > myHueMax){
        myTitle = NSAttributedString(string: titleData, attributes: [NSFontAttributeName:UIFont(name: "Georgia", size: myPickerFontSize)!,NSForegroundColorAttributeName:UIColor.whiteColor()])
    }else{

        myTitle = NSAttributedString(string: titleData, attributes: [NSFontAttributeName:UIFont(name: "Georgia", size: myPickerFontSize)!,NSForegroundColorAttributeName:UIColor.blackColor()])
    }

    pickerLabel!.attributedText = myTitle
    pickerLabel!.textAlignment = .Center


    return pickerLabel!



}else if component == categoryComponent{

    let titleData = categoriesAlphbeticalArray[row]

    var myTitle: NSAttributedString

    if ( gHue > myHueMax){
        myTitle = NSAttributedString(string: titleData, attributes: [NSFontAttributeName:UIFont(name: "Georgia", size: myPickerFontSize)!,NSForegroundColorAttributeName:UIColor.whiteColor()])
    }else{

        myTitle = NSAttributedString(string: titleData, attributes: [NSFontAttributeName:UIFont(name: "Georgia", size: myPickerFontSize)!,NSForegroundColorAttributeName:UIColor.blackColor()])
    }


    pickerLabel!.attributedText = myTitle
    pickerLabel!.textAlignment = .Center


    return pickerLabel!



}else if component == checkNumberComponent {


    if checkNumbersAlphbeticalArray.isEmpty{

        return pickerLabel!

    }

    let titleData = checkNumbersAlphbeticalArray[row]

    var myTitle: NSAttributedString



    if isCheckNumberUsed(titleData){

        if ( gHue > myHueMax){
            myTitle = NSAttributedString(string: titleData, attributes: [NSFontAttributeName:UIFont(name: "Georgia", size: myPickerFontSize)!,NSForegroundColorAttributeName:UIColor.whiteColor(), NSStrikethroughStyleAttributeName: 1])
        }else{

            myTitle = NSAttributedString(string: titleData, attributes: [NSFontAttributeName:UIFont(name: "Georgia", size: myPickerFontSize)!,NSForegroundColorAttributeName:UIColor.blackColor(), NSStrikethroughStyleAttributeName: 1])
        }

    }else{

        if ( gHue > myHueMax){
            myTitle = NSAttributedString(string: titleData, attributes: [NSFontAttributeName:UIFont(name: "Georgia", size: myPickerFontSize)!,NSForegroundColorAttributeName:UIColor.whiteColor()])
        }else{

            myTitle = NSAttributedString(string: titleData, attributes: [NSFontAttributeName:UIFont(name: "Georgia", size: myPickerFontSize)!,NSForegroundColorAttributeName:UIColor.blackColor()])
        }
    }
    pickerLabel!.attributedText = myTitle
    pickerLabel!.textAlignment = .Center


    return pickerLabel!

    }

    return pickerLabel

}

---

在上看到一个示例后，我最终使用了以下内容

只需将此函数添加到现有代码中即可。我发现必须包含每个组件，否则除了支票号码组件之外的组件将为空

 func pickerView(pickerView: UIPickerView, viewForRow row: Int, forComponent component: Int, reusingView view: UIView?) -> UIView {


    let myHueMax = 0.50
    let myPickerFontSize: CGFloat = 20.0
    print("component in lable == \(component)")

    var pickerLabel = view as! UILabel!
    var gHue = Double()


    if view == nil {  //if no label there yet
        pickerLabel = UILabel()
        //color the label's background

        var hue:CGFloat

        if component == payeeComponent  {

            hue = CGFloat(row)/CGFloat(payeesAlphbeticalArray.count)

        }else if component == categoryComponent {

            hue = CGFloat(row)/CGFloat(categoriesAlphbeticalArray.count)

        }else{

             hue = CGFloat(row)/CGFloat(checkNumbersAlphbeticalArray.count)

        }


        pickerLabel!.backgroundColor = UIColor(hue: hue, saturation: 1.0, brightness: 1.0, alpha: 1.0)
        print("hue in label color == \(hue)")

        gHue = Double(hue)
    }

if component == payeeComponent  {



    let titleData = payeesAlphbeticalArray[row]

    var myTitle: NSAttributedString

    if ( gHue > myHueMax){
        myTitle = NSAttributedString(string: titleData, attributes: [NSFontAttributeName:UIFont(name: "Georgia", size: myPickerFontSize)!,NSForegroundColorAttributeName:UIColor.whiteColor()])
    }else{

        myTitle = NSAttributedString(string: titleData, attributes: [NSFontAttributeName:UIFont(name: "Georgia", size: myPickerFontSize)!,NSForegroundColorAttributeName:UIColor.blackColor()])
    }

    pickerLabel!.attributedText = myTitle
    pickerLabel!.textAlignment = .Center


    return pickerLabel!



}else if component == categoryComponent{

    let titleData = categoriesAlphbeticalArray[row]

    var myTitle: NSAttributedString

    if ( gHue > myHueMax){
        myTitle = NSAttributedString(string: titleData, attributes: [NSFontAttributeName:UIFont(name: "Georgia", size: myPickerFontSize)!,NSForegroundColorAttributeName:UIColor.whiteColor()])
    }else{

        myTitle = NSAttributedString(string: titleData, attributes: [NSFontAttributeName:UIFont(name: "Georgia", size: myPickerFontSize)!,NSForegroundColorAttributeName:UIColor.blackColor()])
    }


    pickerLabel!.attributedText = myTitle
    pickerLabel!.textAlignment = .Center


    return pickerLabel!



}else if component == checkNumberComponent {


    if checkNumbersAlphbeticalArray.isEmpty{

        return pickerLabel!

    }

    let titleData = checkNumbersAlphbeticalArray[row]

    var myTitle: NSAttributedString



    if isCheckNumberUsed(titleData){

        if ( gHue > myHueMax){
            myTitle = NSAttributedString(string: titleData, attributes: [NSFontAttributeName:UIFont(name: "Georgia", size: myPickerFontSize)!,NSForegroundColorAttributeName:UIColor.whiteColor(), NSStrikethroughStyleAttributeName: 1])
        }else{

            myTitle = NSAttributedString(string: titleData, attributes: [NSFontAttributeName:UIFont(name: "Georgia", size: myPickerFontSize)!,NSForegroundColorAttributeName:UIColor.blackColor(), NSStrikethroughStyleAttributeName: 1])
        }

    }else{

        if ( gHue > myHueMax){
            myTitle = NSAttributedString(string: titleData, attributes: [NSFontAttributeName:UIFont(name: "Georgia", size: myPickerFontSize)!,NSForegroundColorAttributeName:UIColor.whiteColor()])
        }else{

            myTitle = NSAttributedString(string: titleData, attributes: [NSFontAttributeName:UIFont(name: "Georgia", size: myPickerFontSize)!,NSForegroundColorAttributeName:UIColor.blackColor()])
        }
    }
    pickerLabel!.attributedText = myTitle
    pickerLabel!.textAlignment = .Center


    return pickerLabel!

    }

    return pickerLabel

}

---

我确实使用了你提到的func，但使用了一个我发现它与我所拥有的完美结合的示例。我确实使用了你提到的func，但使用了一个我发现它与我所拥有的完美结合的示例。很高兴它对你起到了作用，但我的代码使用了相同的基本picker view api，并且更加简单明了。；-）很高兴它能为您工作，但我的代码使用了相同的基本picker-view api，并且更加简单明了。；-）