Swift计算一个字符串中有多少个相同的单词

func countSameWords(in string: String) -> Int {
    let words = string.components(separatedBy: CharacterSet.whitespacesAndNewlines)
    var wordCount: [String: Int] = [:]
    
    for word in words {
        if let count = wordCount[word] {
            wordCount[word] = count + 1
        } else {
            wordCount[word] = 1
        }
    }
    
    var sameWordCount = 0
    for count in wordCount.values {
        if count > 1 {
            sameWordCount += 1
        }
    }
    
    return sameWordCount
}

let string = "Swift is a powerful and intuitive programming language. Swift is used to develop iOS and macOS applications."
let result = countSameWords(in: string)
print("The number of same words in the string is: \(result)")