Ios UIPickerView显示空灰色框Swift

我没有太多的代码，所以我不妨把它复制到这里

class ViewController: UIViewController, UIPickerViewDelegate, UIPickerViewDataSource{

    var buildings = ["BankBuilding", "Cinema" , "CornerShop", "Greg's House"]

    @IBOutlet weak var buildText: UITextField!

    var buildPickers:UIPickerView = UIPickerView()

    override func viewDidLoad() {
        super.viewDidLoad()

        buildPickers = UIPickerView()
        buildPickers.delegate = self
        buildPickers.hidden = true;
        buildText.inputView = buildPickers
        buildText.text = buildings[0]        
    }

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

    func pickerView(pickerView: UIPickerView, numberOfRowsInComponent component: Int) -> Int{
        println("Count: \(buildings.count)")
        return buildings.count
    }

    func pickerView(pickerView: UIPickerView, titleForRow row: Int, forComponent component: Int) -> String! {
        println("creating title: \(buildings[row])")
        return buildings[row]
    }

    func pickerView(pickerView: UIPickerView, didSelectRow row: Int, inComponent component: Int)
    {
        println("Selected: \(buildings[row])")
        buildText.text = buildings[row]
        buildPickers.hidden = true;
    }

    func textFieldShouldBeginEditing(textField: UITextField) -> Bool {
        buildPickers.hidden = false
        return false
    }
}

打印语句是正确的。对于

numberOfRows…

和

titleForRow

它正在打印正确的字符串

但是没有打印

didSelectRow

，因为我无法选择行

这就是我得到的：

您可以忽略背景中的Google地图，它不应该干扰Picker视图，并且只是在故事板中设置的

单击文本字段时会出现灰色窗口，但不会显示任何内容。但印刷版的声明并非如此

---

有人知道为什么会这样吗

只需在您的

viewDidLoad

方法中添加这一行：

buildPickers.dataSource = self

您的代码将是：

override func viewDidLoad() {
    super.viewDidLoad()

    buildPickers = UIPickerView()
    buildPickers.delegate = self
    buildPickers.dataSource = self
    buildPickers.hidden = true;
    buildText.inputView = buildPickers
    buildText.text = buildings[0]        
}

它会显示你的数据

更新：

它不会显示，因为您将其设置为隐藏在

viewDidLoad

中

只需从代码中删除这一行：

buildPickers.hidden = true

这是您的工作代码：

import UIKit

class ViewController: UIViewController, UIPickerViewDelegate, UIPickerViewDataSource, UITextFieldDelegate{

    var buildings = ["BankBuilding", "Cinema" , "CornerShop", "Greg's House"]

    @IBOutlet weak var buildText: UITextField!

    var buildPickers:UIPickerView = UIPickerView()

    override func viewDidLoad() {
        super.viewDidLoad()

        buildPickers = UIPickerView()
        buildPickers.delegate = self
        buildPickers.hidden = true
        buildText.delegate = self        //set delegate for textField
        buildText.inputView = buildPickers
        buildText.text = buildings[0]
    }

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

    func pickerView(pickerView: UIPickerView, numberOfRowsInComponent component: Int) -> Int{
        println("Count: \(buildings.count)")
        return buildings.count
    }

    func pickerView(pickerView: UIPickerView, titleForRow row: Int, forComponent component: Int) -> String! {
        println("creating title: \(buildings[row])")
        return buildings[row]
    }

    func pickerView(pickerView: UIPickerView, didSelectRow row: Int, inComponent component: Int)
    {
        println("Selected: \(buildings[row])")
        buildText.text = buildings[row]
        buildPickers.hidden = true;
    }


    //this method will call when you click on textField
    func textFieldShouldBeginEditing(textField: UITextField) -> Bool {
        buildPickers.hidden = false
        return true
    }
}

---

是否在文本字段中设置了代理？您是否收到用于取消隐藏选取器的回调？

我已经将其放入，我尝试将其取出。。。不幸的是，这没什么区别！这就解决了。。。但是

textField中的
buildPickers.hidden=false
行不应该解决这个问题吗？这个方法没有调用，你可以设置断点并检查。因为你没有为这个textField设置委托。很高兴帮助你……）我不完全确定你的意思。一切都在上面粘贴的代码中。您必须使用故事板来设置地图等。？您可能已经在其中设置了文本字段委托。textView与mapView AFAIK没有连接。如果有帮助，文本视图在最初加载视图时会正确更新-
buildText.text=buildings[0]
。