Question

如何快速在字符串的最后三行之前添加一个新单词，以便该字符串可以从此转换：

"Who composed the\n
popular song "Aati Kya\n
Khandala" from 'Ghulam"?\n
Jatin- Lalit\n
Abhijeet\n
Aamir Khan"

对此：

"Who composed the\n
popular song "Aati Kya\n
Khandala" from 'Ghulam"?\n
sagarduhanishere\n
Jatin- Lalit\n
Abhijeet\n
Aamir Khan"

Answer 1

我想你有这样的字符串

let string = """
    "Who composed the
    popular song "Aati Kya
    Khandala" from 'Ghulam"?
    Jatin- Lalit
    Abhijeet
    Aamir Khan"
"""

或类似的

let string = """
    "Who composed the\npopular song "Aati Kya\nKhandala" from 'Ghulam"?\nJatin- Lalit\nAbhijeet\nAamir Khan"
"""

因此，首先将您的字符串分隔为字符串数组

var separated = string.components(separatedBy: "\n")

然后在需要的索引处插入新字符串

separated.insert("sagarduhanishere", at: separated.endIndex - 3)

然后将这个数组重新连接回一个字符串

let joined = separated.joined(separator: "\n")

var separated = string.components(separatedBy: "\n")
separated.insert("sagarduhanishere", at: separated.endIndex - 3)
let joined = separated.joined(separator: "\n")
print(joined)

"Who composed the popular song "Aati Kya Khandala" from 'Ghulam"? sagarduhanishere Jatin- Lalit Abhijeet Aamir Khan"

Answer 2

可接受的答案适用于短字符串。为了获得更好的空间（和时间）复杂度，您可以避免不必要地分割字符串并重新结合数组的所有元素，方法是：

让我们从此文本开始：

let text = """
Who composed the
popular song "Aati Kya
Khandala" from 'Ghulam"?
Jatin- Lalit
Abhijeet
Aamir Khan
"""

结果将存储在此变量中：

var result = ""

使用代码belo，我们从原始字符串的末尾开始寻找第三个\n：

let start = text.startIndex
let end = text.endIndex
var index = text.index(end, offsetBy: -1)
var linesToGo = 3

while start < index  {
    if text[index] == "\n" {
        linesToGo -= 1
    }
    if linesToGo == 0 {
        index = text.index(index, offsetBy: 1)
        result = text[start..<index] + "sagarduhanishere\n" + text[index..<end]
        break
    }
    index = text.index(index, offsetBy: -1)
}

然后我们可以检查是否找到3行

if linesToGo != 0 {
    fatalError("More lines needed")
}

然后打印结果或在代码中使用它：

print(result)

输出：

Who composed the
popular song "Aati Kya
Khandala" from 'Ghulam"?
sagarduhanishere
Jatin- Lalit
Abhijeet
Aamir Khan

Answer 3

这是Regex方式。这是另一种选择。

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如何快速在字符串的最后三行之前添加新单词？

3 个答案: