UIPickerView 选择数组 Swift [英] UIPickerView selection array Swift

问题描述

目前，我的代码可以正常工作，但问题是 UIPickerView 有问题.现在，如果我选择 Cameron 品牌，它会转到 var Cameron，但如果我选择 Shaffer 品牌，它仍然会转到 var Cameron.

Currently, I got my code to work correctly, but the problem I'm having issue with the UIPickerView. Right now, If I select Cameron brand, it goes to var Cameron but if i select Shaffer brand, it still goes to var Cameron.

如何重写代码，以便在选择不同品牌时选择不同的数组?

How can I rewrite the code so when I pick a different brand, it select a different array?

例如，如果我选择品牌cameron，它选择cameron，如果我选择品牌shaffer，它选择shaffer，等等.

For example, if I select brand cameron, it select cameron, if i select brand Shaffer, it pick shaffer, etc.

class Picker: UIViewController, UIPickerViewDelegate, UITextFieldDelegate

{
    var activeTextField:UITextField?

    @IBOutlet var pickerView1: UIPickerView!
    @IBOutlet var pickerView2: UIPickerView!
    @IBOutlet var pickerView3: UIPickerView!

    @IBOutlet var textField1: UITextField!
    @IBOutlet var textField2: UITextField!
    @IBOutlet var textField3: UITextField!

    var brand = ["Cameron","Shaffer", "Hydril"]
    var cameron = ["D Annular Preventer", "UM Ram Preventer", "U Ram Preventer"]
    var shaffer = ["Spherical Annular Preventer", "LXT Ram Preventer", "NXT Ram Preventer"]
    var size = ["7 1/16","11","13 5/8"]
    var size2 = ["8 5/8","12","15 5/8"]

    override func viewDidLoad() {

        super.viewDidLoad()

        pickerView1 = UIPickerView()
        pickerView2 = UIPickerView()
        pickerView3 = UIPickerView()

        pickerView1.tag = 0
        pickerView2.tag = 1
        pickerView3.tag = 2 

    }

    func numberOfComponentsInPickerView(pickerView: UIPickerView) -> Int  {
        return 1
    }

    func pickerView(pickerView: UIPickerView, numberOfRowsInComponent component: Int) -> Int {

        if pickerView.tag == 0 {
            return brand.count
        } else if pickerView.tag == 1 {
            return cameron.count
        } else if pickerView.tag == 2 {
            return size.count
        }
        return 1
    }

    func pickerView(pickerView: UIPickerView, titleForRow row: Int, forComponent component: Int) -> String! {

        if pickerView.tag == 0 {
            return brand[row]
        } else if pickerView.tag == 1 {
            return cameron[row]
        } else if pickerView.tag == 2 {
            return size[row]
        }
        return ""
    }

    func pickerView(pickerView: UIPickerView, didSelectRow row: Int, inComponent component: Int)  {

        if pickerView.tag == 0 {
            textField1.text = brand[row]
        } else if pickerView.tag == 1 {
            textField2.text = cameron[row]
        } else if pickerView.tag == 2 {
            textField3.text = size[row]
        } 
    }

推荐答案

cameron 必须替换为动态查找.您将需要一个品牌字典，然后您可以将其绑定到用户界面:

cameron has to be replaced with a dynamic lookup. You'll need a dictionary of brands, which you can then tie to the UI:

[在我写这篇文章的时候，我发现变量名很糟糕；请避免 0, 1, 2, 为变量编号的疯狂, 3, 4, bleah]

[As I was writing this up I found the variable names awful; please avoid 0, 1, 2, insanity of numbering your variables, 3, 4, bleah]

在班级层面:

var brandLookup = [ "cameron": [ "x", "y", "z"], "anotherBrand": ... ]

那么你的委托功能:

func pickerView(pickerView: UIPickerView, numberOfRowsInComponent component: Int) -> Int {
    if pickerView.tag == 0 {
        return brand.count
    } else if pickerView.tag == 1 {
        let brand = textField1.text
        let modelsForBrand = brandLookup[brand]!
        return modelsForBrand.count
    }
    ...
}

同样:

func pickerView(pickerView: UIPickerView, didSelectRow row: Int, inComponent component: Int)  {
   if pickerView.tag == 0 {
        textField1.text = brand[row]
        pickerView2.reloadAllComponents() // this picker has new data now
   } else if pickerView.tag == 1 {
       let brand = textField1.text
       let modelsForBrand = brandLookup[brand]!
       textField2.text = modelsForBrand[row]
   }
...
}

最后:

func pickerView(pickerView: UIPickerView, titleForRow row: Int, forComponent component: Int) -> String! {
    // left as an exercise for you
}

这篇关于UIPickerView 选择数组 Swift的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！