Question

它有语法错误。 Swift新手:(

var inputString: String = "Hello its question? </question> Oky its the answer"

let splitter: String = "</question>"
var splittedArray = [inputString .componentsSeparatedByString(splitter)]


var questionIndex = 0
var answerIndex = 0
var mQuestions = []
var mAnswers = []


for var index = 0; index < splittedArray.count; ++index {
if index % 2 == 0{
    // Question comes first
    splittedArray.append(mQuestions[questionIndex])
    questionIndex++
}else{
    // Answer comes second

 splittedArray.append(mAnswers[answerIndex])
    answerIndex++
   }
}

错误是：

对象不能转换为String，

在这行代码中。

splittedArray.append(mQuestions[questionIndex])

Answer 1

确实存在语法错误，但并非全部：

您不能像使用[inputString.components...]
如果不指定类型
您的appends

以下是对上述内容的快速重写：

import Foundation

var inputString = "Hello its question? </question> Oky its the answer"

let splitter = "</question>"
var splittedArray = inputString.componentsSeparatedByString(splitter) as [String]

var mQuestions = [String]()
var mAnswers = [String]()

while splittedArray.count >= 2 {
    mQuestions.append(splittedArray.removeAtIndex(0))
    mAnswers.append(splittedArray.removeAtIndex(0))
}

Answer 2

var splittedArray = [inputString .componentsSeparatedByString(splitter)]

客观的一点点宿醉在这里。使用这些方括号，你将它变成一个内部有数组的数组。这将使splittedArray具有错误的类型和错误的内容。

一旦这个程序编译，它也会崩溃，因为你将使用一个越界索引从空splittedArray数组追加到mQuestions。

向Array添加元素时出现Swift语法错误

2 个答案: