Question

我在使用Swift进行编程时遇到了问题。在我创建了SchedulePatientsTest类的实例后，我开始收到此错误：无法使用类型为'的参数列表调用'下标'（名称：$ T4，电子邮件：$ T9，ssn：$ T14，dob：$ T19）'

因为我对Swift很陌生，所以我在调试它时遇到了麻烦，谷歌搜索并没有多大帮助。我知道它抱怨阵列的下标，但我不明白为什么。谢谢你的帮助！

import UIKit

struct SchedulePatientsTest {

let patientNames = [ "John Lennon", "Paul McCartney", "George Harrison", "Ringo Starr" ]
let patientEmails = [ "jlennon@beatles.com", "pmccartney@another.edu","george@something.com","drummer@beatles.org"]
let patientSSN = [ "123-45-6789","333-22-1123","567-39-9282","888-88-8888"]
let patientBirthDates = [ "05/01/1951", "06/23/1964","09/05/1955", "02/28/2001"]
let doctorNames = [ "John Smith", "Jane Doe", "Mary Jones", "Beth Garcia"]
let doctorEmails = [ "John Smith", "Jane Doe", "Mary Jones", "Beth Garcia" ]
let doctorSSN = [ "445-25-3382", "582-10-9983", "180-38-0038", "343 - 34-9875" ]
let doctorBirthDates = [ "06/03/1941", "10/10/1950", "12/25/1965", "07/19/1964" ]
let specialty = [ medicalSpecialties.GENERAL_MEDICINE, medicalSpecialties.PEDIATRICS, medicalSpecialties.GENERAL_MEDICINE, medicalSpecialties.ONCOLOGY]

    init()
    {

    }

}

class Patient {

var name  : String = ""
var email : String = ""
var ssn   : String = ""
var dob   : NSDate = NSDate()
init(name: String, email : String, ssn : String, dob : NSDate) {
    self.name = name
    self.email = email
    self.ssn = ssn
    self.dob = dob

}

    func getName()->(String)
    {
        return(name)
    }

}

class Doctor : Patient {

var specialty : medicalSpecialties

    init(specialty: medicalSpecialties,name: String, email : String, ssn : String, dob : NSDate) {
    self.specialty = specialty
    super.init(name: name, email: email, ssn: ssn, dob: dob)
    }

 }

enum medicalSpecialties {
    case GENERAL_MEDICINE
    case PEDIATRICS
    case ONCOLOGY

}

let CMYK = SchedulePatientsTest()
let P1 = Patient(name: CMYK.patientNames[0], email: CMYK.patientEmails[0], ssn: CMYK.patientSSN[0], dob: CMYK.patientBirthDates[0])

Answer 1

这是一个模糊的错误消息，但是因为您将一个字符串而不是NSDate传递给Patient初始化程序而发生错误。

let patientBirthDates = [ "05/01/1951", ...]创建一个String对象数组，而不是日期对象。 Patient初始值设定项需要NSDate个dob参数。

字符串与NSDate

代码["05/01/1951", "06/23/1964"]不会创建NSDate对象数组，即使该变量定义为patientBirtDates: [NSDate]也是如此。这是一个字符串文字数组。这些字符串文字被转换为＆＃39;进入String个对象。如果要创建NSDate对象数组，则需要实际实例化NSDate对象：

let patientBirthDates = [ NSDate(timeIntervalSince1970: 100), NSDate(timeIntervalSince1970: 200), NSDate(timeIntervalSince1970: 300) ]

您使用哪种创建NSDate的方法取决于您，请查看available ininitializers。

Swift：＆＃34;无法调用下标＆＃34; ：通过在索引处处理类的数组来设置对象成员

1 个答案: