swift: 如何删除特定符号？

Swift 3+

let myString = "aaaaaaaabbbb"

let replaced = myString.replacingOccurrences/of: "bbbb", with: ""/ // "aaaaaaaa"

我发现那种方法

filter

- 这是去这样的好方法：

let unfiltered = "! !! yuahl! !"



// Array of Characters to remove

let removal: [Character] = ["!"," "]



// turn the string into an Array

let unfilteredCharacters = unfiltered.characters



// return an Array without the removal Characters

let filteredCharacters = unfilteredCharacters.filter { !removal.contains/$0/ }



// build a String with the filtered Array

let filtered = String/filteredCharacters/



print/filtered/ // => "yeah"



// combined to a single line

print/String/unfiltered.characters.filter { !removal.contains/$0/ }// // => "yuahl"

如果您需要仅从两端删除字符，则可以使用

stringByTrimmingCharactersInSet/_:/

let delCharSet = NSCharacterSet/charactersInString: "! "/



let s1 = "! aString! !"

let s1Del = s1.stringByTrimmingCharactersInSet/delCharSet/

print/s1Del/ //->aString



let s2 = "! anotherString !! aString! !"

let s2Del = s2.stringByTrimmingCharactersInSet/delCharSet/

print/s2Del/ //->anotherString !! aString

如果您需要删除中间的字符， "reconstruct from the filtered output" 它比重新删除一个角色更有效。

var tempUSView = String.UnicodeScalarView//

tempUSView.appendContentsOf/s2.unicodeScalars.lazy.filter{!delCharSet.longCharacterIsMember/$0.value/}/

let s2DelAll = String/tempUSView/

print/s2DelAll/ //->anotherStringaString

如果您不对象生成大量的中间行和数组，则此单个绑定可以生成预期结果：

let s2DelAll2 = s2.componentsSeparatedByCharactersInSet/delCharSet/.joinWithSeparator/""/

print/s2DelAll2/ //->anotherStringaString

Swift 3

在 Swift 3 语法有点好。 由于旧的巨大加速 APIs 现在称出厂方法

trimmingCharacters/in:/

. 另外，你可以构建

CharacterSet

作为

Set

从一个素食

String

s:

let string = "! !! yuahl! !"

string.trimmingCharacters/in: [" ", "!"]/ // "yuahl"

如果您在线中间有字符，您还想要删除，则可以使用

components/separatedBy:/.joined//

:

let string = "! !! yu !ahl! !"

string.components/separatedBy: ["!", " "]/.joined// // "yuahl"

H / T @OOPer 版本 Swift 2

func trimLast/character chars: Set<character>/ -&gt; String {

 

 let str: String = String/self.reversed///



 guard let index = str.index/where: {!chars.contains/$0/}/ else {

 return self

 }

 return String//str[index..<str.endindex] ,="" .reversed="" <="" [code]string[="" code]="" div="" }[="" 将此功能添加到扩展="" 您最终可以删除特定的字符串符号。="" 笔记：="">

<div class="answer_text">

您还可以添加如此非常有用的扩展。 :





[code]import Foundation





extension String{

 func exclude/find:String/ -&gt; String {

 return stringByReplacingOccurrencesOfString/find, withString: "", options: .CaseInsensitiveSearch, range: nil/

 }

 func replaceAll/find:String, with:String/ -&gt; String {

 return stringByReplacingOccurrencesOfString/find, withString: with, options: .CaseInsensitiveSearch, range: nil/

 }

}

</div>
<div class="answer_text">

for index in InputName.characters.indices.reversed// {

 if String/InputName[index]/ == "" || InputName.substringToIndex/index/ == "!" {

 InputName.removeAtIndex/index/

 }

}

</div>
<div class="answer_text">
您可以使用它：

例如，如果要删除 " % " 百分比 10%

if let i = text.firstIndex/of: "%"/ {

 text.remove/at: i/ //10

 }

</div>
</str.endindex]></character>

您还可以添加如此非常有用的扩展。 :

import Foundation





extension String{

 func exclude/find:String/ -> String {

 return stringByReplacingOccurrencesOfString/find, withString: "", options: .CaseInsensitiveSearch, range: nil/

 }

 func replaceAll/find:String, with:String/ -> String {

 return stringByReplacingOccurrencesOfString/find, withString: with, options: .CaseInsensitiveSearch, range: nil/

 }

}

for index in InputName.characters.indices.reversed// {

 if String/InputName[index]/ == "" || InputName.substringToIndex/index/ == "!" {

 InputName.removeAtIndex/index/

 }

}

您可以使用它：

例如，如果要删除 " % " 百分比 10%

if let i = text.firstIndex/of: "%"/ {

 text.remove/at: i/ //10

 }