Swift 相当于 Array.componentsJoinedByString? [英] Swift equivalent of Array.componentsJoinedByString?

问题描述

在 Objective-C 中，我们可以调用 componentsJoinedByString 来生成一个字符串，其中数组的每个元素由提供的字符串分隔.虽然 Swift 在 String 上有一个 componentsSeparatedByString 方法，但在 Array 上似乎没有相反的方法:

In Objective-C we can call componentsJoinedByString to produce a string with each element of the array separated by the supplied string. While Swift has a componentsSeparatedByString method on String, there doesn't appear to be the inverse of this on Array:

'Array<String>' does not have a member named 'componentsJoinedByString'

Swift 中 componentsSeparatedByString 的逆是什么?

What is the inverse of componentsSeparatedByString in Swift?

推荐答案

Swift 3.0:

类似于 Swift 2.0，但 API 重命名已将 joinWithSeparator 重命名为 joined(separator:).

let joinedString = ["1", "2", "3", "4", "5"].joined(separator: ", ")

// joinedString: String = "1, 2, 3, 4, 5" 

请参阅 Sequence.join(separator:) 了解更多信息.

See Sequence.join(separator:) for more information.

您可以使用 SequenceType 上的 joinWithSeparator 方法将字符串数组与字符串分隔符连接起来.

You can use the joinWithSeparator method on SequenceType to join an array of strings with a string separator.

let joinedString = ["1", "2", "3", "4", "5"].joinWithSeparator(", ")

// joinedString: String = "1, 2, 3, 4, 5" 

请参阅 SequenceType.joinWithSeparator(_:) 了解更多信息.

See SequenceType.joinWithSeparator(_:) for more information.

您可以使用 String 上的 join 标准库函数将字符串数组与字符串连接起来.

You can use the join standard library function on String to join an array of strings with a string.

let joinedString = ", ".join(["1", "2", "3", "4", "5"])

// joinedString: String = "1, 2, 3, 4, 5" 

或者，如果您愿意，可以使用全局标准库函数:

Or if you'd rather, you can use the global standard library function:

let joinedString = join(", ", ["1", "2", "3", "4", "5"])

// joinedString: String = "1, 2, 3, 4, 5"

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