Swift3.0 split函数切割字符串

概述我们先看函数的原型： public func split(separator: Self.Iterator.Element, maxSplits: Int = default, omittingEmptySubsequences: Bool = default) -> [Self.SubSequence] 第一个参数就不用解释了，传入要切割的字符串，像这样 let line = "BLANCHE:

我们先看函数的原型：

public func split(separator: Self.Iterator.Element,maxSplits: Int = default,omittingEmptySubsequences: Bool = default) -> [Self.SubSequence]

第一个参数就不用解释了，传入要切割的字符串，像这样

let line = "BLANCHE:   I don't want realism. I want magic!"print(line.characters.split(separator: " ")                     .map(String.init))// Prints "["BLANCHE:","I","don\'t","want","realism.","magic!"]"

下面看第二个参数，像这样，意思是切割几次，设置为1的话就把原来的字符串切成两个。

// The second example passes `1` for the `maxSplits` parameter,so the// original string is split just once,into two new strings.print(line.characters.split(separator: " ",maxSplits: 1)                     .map(String.init))// Prints "["BLANCHE:","  I don\'t want realism. I want magic!"]"

第三个参数就很明确了，是否保留隐藏字符

// The final example passes `false` for the `omittingEmptySubsequences`// parameter,so the returned array contains empty strings where spaces// were repeated.print(line.characters.split(separator: " ",omittingEmptySubsequences: false)                      .map(String.init))// Prints "["BLANCHE:","","magic!"]"

看看官方文档对这三个参数的解释，懒得翻译了，也不是很难懂。

/// - Parameters:///   - separator: The element that should be split upon.///   - maxSplits: The maximum number of times to split the collection,or///     one less than the number of subsequences to return. If///     `maxSplits + 1` subsequences are returned,the last one is a suffix///     of the original collection containing the remaining elements.///     `maxSplits` must be greater than or equal to zero. The default value///     is `Int.max`.///   - omittingEmptySubsequences: If `false`,an empty subsequence is///     returned in the result for each consecutive pair of `separator`///     elements in the collection and for each instance of `separator` at///     the start or end of the collection. If `true`,only nonempty///     subsequences are returned. The default value is `true`./// - Returns: An array of subsequences,split from this collection's///   elements.

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