swift 首字母大写处理，区分标题和句子

 

样例1:

let temStr1 = "this is first sentence. this is second sentence."

print(temStr1.capitalized)

This Is First Sentence. This Is Second Sentence.

 

样例2:

let temStr2 = "this is first sentence. this is second sentence."

print(temStr2.capitalizingFirstLetter())

This is first sentence. This is second sentence.

 

结论：如果只是标题需要做成样例1，是句子需要做成样例2。

 

说明：

1. capitalized是swift 系统属性；

2.capitalizingFirstLetter是字体String的拓展方法，如下：

extension String {

    func capitalizingFirstLetter() -> String {

        return prefix(1).capitalized + dropFirst()

    }

   mutating func capitalizeFirstLetter() {

        self = self.capitalizingFirstLetter()

    }

}