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我在提交按钮中有一个针对性别的分段控件，但是，它给出了一个错误说明：

“无法将类型“String”的值分配给类型“UISegmentedControl！”“

有谁知道如何在按钮内正确编码分段控件，以便当用户单击提交按钮时，它会在页面上显示选定的性别？

编辑：我要回答的问题是：

“实现一个应用程序，其中包括名称、地址和步进器（用于年龄）和两个分段控件（用于“男性/女性”和“已注册/未注册”）的输入字段。当用户单击提交按钮时，它会显示页面上的消息，例如您好姓名、地址：地址、年龄：年龄、性别：男/女、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

  }
 }
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1 回答 1

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发生此错误的原因由编译器简单描述:) 只需使用 String 而不是 SegmentControl... 性别是 SegmentControl 类型，因此您不能将其与其他字符串连接...

用于titleForSegment(at:)获取正确的字符串值

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

你可以摆脱上述条件......

其他选项是在内部设置新的私有财产IBAction

@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

于 2018-10-06T07:26:34.767 回答