我正在尝试将UIStepper
合并到UITextField
中,同时增加步进器的值,UITextField
会随之更新为该值。我不断收到错误:
"由于未捕获的异常"NSInvalidArgumentException"而终止应用程序,原因:"-[计算器.SplitViewController stepperValueChanged:]:无法识别的选择器发送到实例 0x7fd730c0af30"
每当我运行我的应用程序并点击步进器上的"+"按钮时。
有什么解决办法吗?我检查了我的选择器功能,我认为它看起来是正确的。
override func viewDidLoad() {
super.viewDidLoad()
partyOfStepper.autorepeat = true
partyOfStepper.minimumValue = 1
partyOfStepper.maximumValue = 99
partyOfTextField.text = "(Int(partyOfStepper.value))"
partyOfStepper.addTarget(self, action: #selector(stepperValueChanged(stepper:)), for: .valueChanged)
}
@IBAction func calculateButtonTapped(_ sender: Any) {
}
func stepperValueChanged(stepper: UIStepper) {
let stepperMapping: [UIStepper: UITextField] = [partyOfStepper: partyOfTextField]
stepperMapping[stepper]!.text = "(Int(stepper.value))"
}
正如 Nariv 所说,您的代码对我有用,请确保您之前没有在设计器中为 UIStepper 创建操作(检查连接检查器):
import UIKit
class ViewController: UIViewController {
@IBOutlet weak var partyOfStepper: UIStepper!
@IBOutlet weak var partyOfTextField: UITextField!
override func viewDidLoad() {
super.viewDidLoad()
partyOfStepper.autorepeat = true
partyOfStepper.minimumValue = 1
partyOfStepper.maximumValue = 99
partyOfTextField.text = "(Int(partyOfStepper.value))"
partyOfStepper.addTarget(self, action: #selector(stepperValueChanged(stepper:)), for: .valueChanged)
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
}
func stepperValueChanged(stepper: UIStepper) {
let stepperMapping: [UIStepper: UITextField] = [partyOfStepper: partyOfTextField]
stepperMapping[stepper]!.text = "(Int(stepper.value))"
}
}