tablecodecontroller中的xcode 7多个pickerviews

Question

所以我一直在尝试在我设置的TableViewController中设置几个pickerviews作为不同文本字段的键盘。当我点击TextFields时，我想要打开pickerview，它会打开一个pickerview键盘，但它没有信息，当我点击普通文本字段时它不会打开键盘在任何人都可以请帮助我。

import UIKit

class AddProductTableViewController: UITableViewController, UIPickerViewDataSource, UIPickerViewDelegate {
    @IBOutlet weak var productPicker: UITextField!
    @IBOutlet weak var unitCost: UITextField!
    @IBOutlet weak var total: UITextField!
    @IBOutlet weak var City: UITextField!
    @IBOutlet weak var statePicker: UITextField!
    @IBOutlet weak var date: UITextField!
    @IBAction func datePicker(sender: UITextField) {

        let datePickerView: UIDatePicker = UIDatePicker()
        datePickerView.datePickerMode = UIDatePickerMode.Date
        sender.inputView = datePickerView
        datePickerView.addTarget(self, action: Selector("datePickerValueChanged:"), forControlEvents: UIControlEvents.ValueChanged)

    }

    var productPickerOption = []

    var statePickerOption = []

    override func viewDidLoad() {
        super.viewDidLoad()

        productPickerOption = ["Diesel","Gas"]
        let productPickerView = UIPickerView()
        productPickerView.delegate = self
        productPicker.inputView = productPickerView

        statePickerOption = ["AL", "AK", "AZ", "AR", "CA", "CO", "CT", "DE", "FL", "GA", "HI", "ID", "IL", "IN", "IA", "KS", "KY", "LA", "ME", "MD", "MA", "MI","MN", "MS", "MO", "MT", "NE", "NV", "NH", "NJ", "NM", "NY", "NC", "ND", "OH", "OK", "OR", "PA", "RI", "SC", "SD", "TN", "TX", "UT", "VT", "VA", "WA", "WV", "WI", "WY"]
        let statePickerView = UIPickerView()
        statePickerView.delegate = self
        statePicker.inputView = statePickerView

    }

    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    }

    func numberOfComponentsInPickerView(pickerView: UIPickerView) -> Int {
        //the number of compontes(or "columns") that the picker view should display
        return 1
    }

    func pickerView(pickerView: UIPickerView, numberOfRowsInComponent component: Int) -> Int {
        //the number rows for the component
        if(pickerView.tag == 1) {
            return productPickerOption.count
        }else if(pickerView.tag == 2){
            return statePickerOption.count
        }else{
            return 0
        }
    }

    func pickerView(pickerView: UIPickerView, titleForRow row: Int, forComponent component: Int) -> String? {
        //the title of the picker view
        if(pickerView.tag == 1) {
            return "\(productPickerOption[row])"
        }else if(pickerView.tag == 2) {
            return "\(statePickerOption)"
        }else {
            return nil
        }
    }

    func pickerView(pickerView: UIPickerView, didSelectRow row: Int, inComponent component: Int) {
        if(pickerView.tag == 1){
            productPicker.text = productPickerOption[row] as? String
        }else if(pickerView.tag == 2){
            statePicker.text = statePickerOption[row] as? String
        }
    }
}

Answer 1

只需在viewDidLoad方法中添加：

productPickerView.dataSource = self
statePickerView.dataSource = self

同样以这种方式在pickerView中添加标签：

productPickerView.tag = 1
statePickerView.tag = 2 

您的代码如下：

import UIKit

class SecondTableViewController: UITableViewController, UIPickerViewDataSource, UIPickerViewDelegate {

    @IBOutlet weak var productPicker: UITextField!
    @IBOutlet weak var unitCost: UITextField!
    @IBOutlet weak var total: UITextField!
    @IBOutlet weak var city: UITextField!
    @IBOutlet weak var statePicker: UITextField!
    @IBOutlet weak var date: UITextField!
    @IBAction func datePicker(sender: UITextField) {

        let datePickerView: UIDatePicker = UIDatePicker()
        datePickerView.datePickerMode = UIDatePickerMode.Date
        sender.inputView = datePickerView
        datePickerView.addTarget(self, action: Selector("datePickerValueChanged:"), forControlEvents: UIControlEvents.ValueChanged)

    }

    var productPickerOption = []

    var statePickerOption = []

    override func viewDidLoad() {
        super.viewDidLoad()

        productPickerOption = ["Diesel","Gas"]
        let productPickerView = UIPickerView()
        productPickerView.delegate = self
        productPickerView.dataSource = self
        productPickerView.tag = 1
        productPicker.inputView = productPickerView

        statePickerOption = ["AL", "AK", "AZ", "AR", "CA", "CO", "CT", "DE", "FL", "GA", "HI", "ID", "IL", "IN", "IA", "KS", "KY", "LA", "ME", "MD", "MA", "MI","MN", "MS", "MO", "MT", "NE", "NV", "NH", "NJ", "NM", "NY", "NC", "ND", "OH", "OK", "OR", "PA", "RI", "SC", "SD", "TN", "TX", "UT", "VT", "VA", "WA", "WV", "WI", "WY"]
        let statePickerView = UIPickerView()
        statePickerView.delegate = self
        statePickerView.dataSource = self
        statePickerView.tag = 2
        statePicker.inputView = statePickerView

    }

    func numberOfComponentsInPickerView(pickerView: UIPickerView) -> Int {
        //the number of compontes(or "columns") that the picker view should display
        return 1
    }

    func pickerView(pickerView: UIPickerView, numberOfRowsInComponent component: Int) -> Int {
        //the number rows for the component
        if(pickerView.tag == 1) {
            return productPickerOption.count
        }else if(pickerView.tag == 2){
            return statePickerOption.count
        }else{
            return 0
        }
    }

    func pickerView(pickerView: UIPickerView, titleForRow row: Int, forComponent component: Int) -> String? {
        //the title of the picker view
        if(pickerView.tag == 1) {
            return "\(productPickerOption[row])"
        }else if(pickerView.tag == 2) {
            return "\(statePickerOption[row])"  //add [row] here
        }else {
            return nil
        }
    }

    func pickerView(pickerView: UIPickerView, didSelectRow row: Int, inComponent component: Int) {
        if(pickerView.tag == 1){
            productPicker.text = productPickerOption[row] as? String
        }else if(pickerView.tag == 2){
            statePicker.text = statePickerOption[row] as? String
        }
    }
}