删除开头和结尾的空格:

let trimmedString = string.stringByTrimmingCharactersInSet(NSCharacterSet.whitespaceCharacterSet())

Swift 3 / Swift 4:

let trimmedString = string.trimmingCharacters(in: .whitespaces)

你也可以试试这个

   let updatedString = searchedText?.stringByReplacingOccurrencesOfString(" ", withString: "-")

删除字符串中的所有空格:

let space_removed_string = (yourstring?.components(separatedBy: " ").joined(separator: ""))!

对于任何想要从字符串中删除前导空格的人(正如问题标题所明确要求的那样)，这里有一个答案:

假设:

let string = "   Hello, World!   "

要删除所有前导空格，使用以下代码:

var filtered = ""
var isLeading = true
for character in string {
    if character.isWhitespace && isLeading {
        continue
    } else {
        isLeading = false
        filtered.append(character)
    }
}
print(filtered) // "Hello, World!   "

我相信有比这更好的代码，但它已经完成了我的工作。

这个String扩展删除了字符串中的所有空格，而不仅仅是尾随空格…

 extension String {
    func replace(string:String, replacement:String) -> String {
        return self.replacingOccurrences(of: string, with: replacement, options: NSString.CompareOptions.literal, range: nil)
    }

    func removeWhitespace() -> String {
        return self.replace(string: " ", replacement: "")
    }
  }

例子:

let string = "The quick brown dog jumps over the foxy lady."
let result = string.removeWhitespace() // Thequickbrowndogjumpsoverthefoxylady.

尝试函数式编程来删除空白:

extension String {
  func whiteSpacesRemoved() -> String {
    return self.filter { $0 != Character(" ") }
  }
}