UITextField Swift中的ios – resignFirstResponder

概述在工具栏上单击完成按钮后,我希望UIPickerView被关闭(滑出视图).我将UIPickerView链接到UITextField的inputView,并将UIToolbar设置为UIPickerView的inputAccessoryView.但是,我的函数调用resignFirstResponder不会将UIPicker从视图中滑出.任何帮助,谢谢,提前谢谢！ import UIKitcl 在工具栏上单击完成按钮后,我希望UIPickerVIEw被关闭(滑出视图).我将UIPickerVIEw链接到UITextFIEld的inputVIEw,并将UIToolbar设置为UIPickerVIEw的inputAccessoryVIEw.但是,我的函数调用resignFirstResponder不会将UIPicker从视图中滑出.任何帮助,谢谢,提前谢谢！

import UIKitclass VIEwController: UIVIEwController,UIPickerVIEwDataSource,UIPickerVIEwDelegate {    // Do any additional setup after loading the vIEw,typically from a nib.    //initialization constants    let pickerVIEw = UIPickerVIEw()    let textFIEld = UITextFIEld()    let pickerData = ["1","2","three"]    overrIDe func vIEwDIDLoad() {        //pickervIEw tool bar        let toolbar = UIToolbar(frame: CGRectMake(0,320,44))        var items = [AnyObject]()        //making done button        let donebutton = UIbarbuttonItem(Title: "Done",style: .Plain,target: self,action: Selector(donepressed()))        items.append(donebutton)        toolbar.barStyle = UIbarStyle.Black        toolbar.setItems(items,animated: true)        //creating textfIElds with a pickervIEw        pickerVIEw.delegate = self        pickerVIEw.dataSource = self        pickerVIEw.frame = CGRectMake(0,500,300)        textFIEld.inputAccessoryVIEw = toolbar        textFIEld.inputVIEw = pickerVIEw        textFIEld.frame = CGRectMake(200,55,100,35)    textFIEld.backgroundcolor = UIcolor.bluecolor()    //adding obJs to vIEwController    self.vIEw.addSubvIEw(textFIEld)}func donepressed() {    resignFirstResponder()}overrIDe func dIDReceiveMemoryWarning() {    super.dIDReceiveMemoryWarning()    // dispose of any resources that can be recreated.}}//MARK: Data Sources UIPickerVIEwextension VIEwController: UIPickerVIEwDataSource {    func numberOfComponentsInPickerVIEw(pickerVIEw: UIPickerVIEw) -> Int {        return 1    }    func pickerVIEw(pickerVIEw: UIPickerVIEw!,numberOfRowsInComponent component: Int) -> Int {        return pickerData.count    }}//MARK: Delegates UIPickerVIEwextension VIEwController: UIPickerVIEwDelegate {    // several optional methods:func pickerVIEw(pickerVIEw: UIPickerVIEw,TitleForRow row: Int,forComponent component: Int) -> String! {    return pickerData[row]}func pickerVIEw(pickerVIEw: UIPickerVIEw!,dIDSelectRow row: Int,inComponent component: Int) {    textFIEld.text = pickerData[row]}}

有两个问题：

>对于donepressed的选择器声明不正确.它应该是：

let donebutton = UIbarbuttonItem(Title: "Done",action: "donepressed")

>您需要在textFIEld上调用resignFirstResponder()：

func donepressed() {    textFIEld.resignFirstResponder()}

如果您有多个textFIEld,并且您不想在resignFirstResponder调用中对textFIEld进行硬编码,则可以执行以下 *** 作：

>使您的VIEwController成为UITextFIEldDeletate：

class VIEwController: UIVIEwController,UIPickerVIEwDelegate,UITextFIEldDelegate {

>在UITextFIEld上设置delegate属性：

textFIEld.delegate = self

>将一个属性添加到VIEwController以跟踪活动的UITextFIEld：

var activeTextFIEld:UITextFIEld?

>实现textFIEldDIDBeginEditing并存储活动的UITextFIEld：

func textFIEldDIDBeginEditing(textFIEld: UITextFIEld) { // became first responder    activeTextFIEld = textFIEld}

>在donepressed中,调用activeTextFIEld上的resignFirstResponder：

func donepressed() {    activeTextFIEld?.resignFirstResponder()}

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