Question

我在“提交”按钮中有一个按性别划分的控件，但是，它显示了一个错误：

“无法将类型为” String“的值分配为类型为” UISegmentedControl！“”

有人知道如何正确编码按钮内的分段控件，以便当用户单击“提交”按钮时，该控件在页面上显示所选性别吗？

编辑：我要回答的问题是：

“实施一个包含名称，地址和步进器（针对年龄）的输入字段以及两个分段控件（针对“男性/女性”和“已注册/未注册”的输入框的应用程序。）当用户单击提交按钮时，它会在页面上显示消息，例如Hello Name，地址：地址，年龄：年龄，性别：男性/女性，状态：已注册/未注册。”

这是我的编码：

import UIKit

class ViewController: UIViewController {

@IBOutlet weak var nametxt: UITextField!
@IBOutlet weak var age: UIStepper!
@IBOutlet weak var addresstxt: UITextField!
@IBOutlet weak var status: UISegmentedControl!
@IBOutlet weak var gender: UISegmentedControl!
@IBOutlet weak var display: UILabel!


override func viewDidLoad() {
    super.viewDidLoad()

    age.wraps = true
    age.autorepeat = true
    age.maximumValue = 100
}

override func didReceiveMemoryWarning() {
    super.didReceiveMemoryWarning()
    // Dispose of any resources that can be recreated.
}

@IBAction func submit(_ sender: Any) {
    var txtname : String
    var txtaddress : String
    txtname = nametxt.text!
    txtaddress = addresstxt.text!


    if self.gender.selectedSegmentIndex == 0 {
        gender = "male"
    }

    if self.gender.selectedSegmentIndex == 1 {
        gender = "female"
    }

    display.text = "Hello " + txtname + ", " + "Address: " + txtaddress  
    + ", " + "Gender: " + gender

  }
 }

Answer 1

发生此错误的原因仅由编译器描述：)只需使用String代替SegmentControl ...性别是SegmentControl类型，因此您无法将其与其他字符串连接...

使用titleForSegment(at:)获得正确的字符串值

display.text = "Hello " + txtname + ", " + "Address: " + txtaddress + ", " + "Gender: " + gender.titleForSegment(at: gender.selectedSegmentIndex)

您可以摆脱上述条件...

其他选择是在IBAction内设置新的私有财产

@IBAction func submit(_ sender: Any) {
    // Fixed your codestyle and semantics as well
    let txtname = nametxt.text ?? "missing name"
    let txtaddress = addresstxt.text ?? "missing address"

    let txtgender = gender.titleForSegment(at: gender.selectedSegmentIndex)
    display.text = "Hello " + txtname + ", " + "Address: " + txtaddress  
    + ", " + "Gender: " + txtgender

  }
 }

`https://developer.apple.com/documentation/uikit/uisegmentedcontrol/1618561-titleforsegment

如何在iOS（Xcode）中的“提交”按钮内实现分段控件？

1 个答案: