我正在尝试从uipickerview的选定行中设置我的Button标题。但是,我似乎找不到有效的解决方案。
我已将变量设置为全局变量,因此可以访问所选变量。但是,我似乎无法确切指出用户何时单击退出按钮并能够更新我的按钮标题。
我尝试过的事情:
我在这里找到的解决方案是在Obj-C中。我尝试将其转换为快速https://objectivec2swift.com/#/converter/code/,但没有运气。 Set Title of UIButton from Selected Row of UIPickerView
@IBAction func CountryPickButton(_ sender: UIButton) {
Global.setPickerDataSource(data:["Test","test2","test3"])
Global.setPickerCompletionHandler(int:0)
let popOverVC = UIStoryboard(name: "Main", bundle: nil).instantiateViewController(withIdentifier: "PickerViewPopUpId") as! PickerViewController
//CountryPickButtonDetector = sender as? UIButton
self.addChild(popOverVC)
popOverVC.view.frame = self.view.frame
self.view.addSubview(popOverVC.view)
popOverVC.didMove(toParent: self)
popOverVC.callback { value in
//CountryPickButton.title.text = value
sender.setTitle(value, for: UIControl.State)
}
}
import UIKit
var test = ""
class PickerViewController: UIViewController {
@IBOutlet weak var PickerView: UIPickerView!
var callback : ((String) -> Void)?
override func viewDidLoad() {
super.viewDidLoad()
//self.view.backgroundColor = UIColor.black.withAlphaComponent(0.8)
PickerView.dataSource = self
PickerView.delegate = self
// Do any additional setup after loading the view.
}
@IBAction func ExitButton(_ sender: Any) {
switch Global.pickerCompletionHandler {
case 0:
callback?(Global.pickerResult ?? "")
Global.setProfileCountry(string:
Global.pickerResult ?? "")
default:
print("nothing")
}
self.view.removeFromSuperview()
}
}
extension PickerViewController: UIPickerViewDelegate, UIPickerViewDataSource {
func numberOfComponents(in pickerView: UIPickerView) -> Int {
return 1 // can be more than 1 component like time/date/year
}
func pickerView(_ pickerView: UIPickerView, numberOfRowsInComponent component: Int) -> Int {
return Global.pickerDataSource?.count ?? 1
}
func pickerView(_ pickerView: UIPickerView, didSelectRow row: Int, inComponent component: Int) {
//Global.pickerResult = Global.pickerDataSource?[row]
Global.setPickerResult(result: Global.pickerDataSource?[row] ?? "Test" )
}
func pickerView(_ pickerView: UIPickerView, titleForRow row: Int, forComponent component: Int) -> String? {
return Global.pickerDataSource?[row]
}
}
全球
import Foundation
struct Global {
static var pickerDataSource:[String]? = nil
static var pickerResult:String? = nil
static var pickerCompletionHandler:Int? = 0
static var profileCountry:String? = nil
static func setPickerDataSource(data:[String]) {
Global.pickerDataSource = data
}
static func setPickerResult(result:String) {
Global.pickerResult = result
}
static func setPickerCompletionHandler(int: Int) {
Global.pickerCompletionHandler = int
}
static func setProfileCountry(string: String)
{
Global.profileCountry = string
}
}
答案 0 :(得分:1)
我不知道所有Global
的内容是什么,最简单的解决方案可能是扩展pickerCompletionHandler
,但这是另一个(简单的)方法:
在PickerViewController
中添加一个传递String
值且没有返回值的回调
var callback : ((String) -> Void)?
并在exitButton
中调用它(请变量和函数名应该以小写字母开头)
@IBAction func exitButton(_ sender: Any) {
switch Global.pickerCompletionHandler {
case 0:
callback?(Global.pickerResult ?? "")
Global.setProfileCountry(string:
Global.pickerResult ?? "")
default:
print("nothing")
}
self.view.removeFromSuperview()
}
在countryPickButton
(再次:小写字母)中设置回调并将sender
设置为实型。回调设置标题
@IBAction func countryPickButton(_ sender: UIButton) {
Global.setPickerDataSource(data:["Test","test2","test3"])
Global.setPickerCompletionHandler(int:0)
let popOverVC = UIStoryboard(name: "Main", bundle: nil).instantiateViewController(withIdentifier: "PickerViewPopUpId") as! PickerViewController
popOverVC.callback = { value in
sender.setTitle(value, for: .normal)
}
...