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 UIKit
class 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 UIPickerView
extension ViewController: UIPickerViewDataSource {
func numberOfComponentsInPickerView(pickerView: UIPickerView) -> Int {
return 1
}
func pickerView(pickerView: UIPickerView!,numberOfRowsInComponent component: Int) -> Int {
return pickerData.count
}
}
//MARK: Delegates UIPickerView
extension 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：
原文链接：https://www.f2er.com/swift/318892.html>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,则可以执行以下操作：
>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()
}
