swift对String有修饰方法吗？

本文翻译自：Does swift have a trim method on String?

Does swift have a trim method on String? swift对String有修饰方法吗？ For example: 例如：

let result = " abc ".trim()
// result == "abc"

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#1楼

参考：https://stackoom.com/question/1oRJb/swift对String有修饰方法吗

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#2楼

Here's how you remove all the whitespace from the beginning and end of a String . 以下是从String的开头和结尾删除所有空格的方法。

(Example tested with Swift 2.0 .) （使用Swift 2.0测试的示例。）

let myString = "  \t\t  Let's trim all the whitespace  \n \t  \n  "
let trimmedString = myString.stringByTrimmingCharactersInSet(
    NSCharacterSet.whitespaceAndNewlineCharacterSet()
)
// Returns "Let's trim all the whitespace"

(Example tested with Swift 3+ .) （使用Swift 3+测试的示例。）

let myString = "  \t\t  Let's trim all the whitespace  \n \t  \n  "
let trimmedString = myString.trimmingCharacters(in: .whitespacesAndNewlines)
// Returns "Let's trim all the whitespace"

Hope this helps. 希望这可以帮助。

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#3楼

You can use the trim() method in a Swift String extension I wrote https://bit.ly/JString . 您可以在我写的https://bit.ly/JString的Swift String扩展中使用trim（）方法。

var string = "hello  "
var trimmed = string.trim()
println(trimmed)// "hello"

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#4楼

Put this code on a file on your project, something likes Utils.swift: 将此代码放在项目的文件中，类似于Utils.swift：

extension String
{   
    func trim() -> String
    {
        return self.stringByTrimmingCharactersInSet(NSCharacterSet.whitespaceCharacterSet())
    }
}

So you will be able to do this: 所以你将能够做到这一点：

let result = " abc ".trim()
// result == "abc"

Swift 3.0 Solution Swift 3.0解决方案

extension String
{   
    func trim() -> String
   {
    return self.trimmingCharacters(in: NSCharacterSet.whitespaces)
   }
}

So you will be able to do this: 所以你将能够做到这一点：

let result = " Hello World ".trim()
// result = "HelloWorld"

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#5楼

I created this function that allows to enter a string and returns a list of string trimmed by any character 我创建了这个函数，允许输入一个字符串并返回由任何字符修剪的字符串列表

 func Trim(input:String, character:Character)-> [String]
{
    var collection:[String] = [String]()
    var index  = 0
    var copy = input
    let iterable = input
    var trim = input.startIndex.advancedBy(index)

    for i in iterable.characters

    {
        if (i == character)
        {

            trim = input.startIndex.advancedBy(index)
            // apennding to the list
            collection.append(copy.substringToIndex(trim))

            //cut the input
            index += 1
            trim = input.startIndex.advancedBy(index)
            copy = copy.substringFromIndex(trim)

            index = 0
        }
        else
        {
            index += 1
        }
    }
    collection.append(copy)
    return collection

}

as didn't found a way to do this in swift (compiles and work perfectly in swift 2.0) 因为没有找到一种方法在swift中完成此操作（在swift 2.0中编译和完美工作）

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#6楼

extension String {
    /// EZSE: Trims white space and new line characters
    public mutating func trim() {
         self = self.trimmed()
    }

    /// EZSE: Trims white space and new line characters, returns a new string
    public func trimmed() -> String {
        return self.stringByTrimmingCharactersInSet(NSCharacterSet.whitespaceAndNewlineCharacterSet())
    }
}

Taken from this repo of mine: https://github.com/goktugyil/EZSwiftExtensions/commit/609fce34a41f98733f97dfd7b4c23b5d16416206 取自我的回购： https ： //github.com/goktugyil/EZSwiftExtensions/commit/609fce34a41f98733f97dfd7b4c23b5d16416206