在Swift中查找字符串中的空格数 [英] Find number of spaces in a string in Swift

问题描述

在Swift中我该调用什么方法来查找字符串中的空格数?我想遍历这个数字，像这样:

What method do I call to find the number of spaces in a string in Swift? I want to loop through that number, something like this:

@IBOutlet weak var stack: UILabel!

@IBOutlet weak var plus: UIButton!

 @IBAction func sum(sender: AnyObject) {
    var stackTitle = stack.text
    var numberOfSpaces = stackTitle!.CanICallSomethingHereToHelp:)
    var i:Int
    for i = 1; i < numberOfSpaces; ++i{
        operate(plus)
    }
}

推荐答案

Swift 5或更高版本

在Swift 5中，我们可以使用新的Character属性 isWhitespace 和 isNewline

In Swift 5 we can use the new Character properties isWhitespace and isNewline

let str = "Hello, playground. Hello, playground !!!"
let spaceCount = str.reduce(0) { $1.isWhitespace && !$1.isNewline ? $0 + 1 : $0 }
print(spaceCount) // 4

---

如果您只想计算" "

let spaceCount = str.reduce(0) { $1 == " " ? $0 + 1 : $0 }

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