swift Character类型详解及实例

1、遍历字符串

// for-in 遍历Stringfor c in str.characters{ print(c)}//c是Character类型

2、Character声明

// Character和String的相互转换//let mark = "!" //此时mark是String类型let mark: Character = "!" //Character必须要显示声明//str + mark //类型不同拼接会报错str + String(mark) //进行类型转换后再拼接// append 相当于 +=str.append(mark)//var类型才可以调用append方法，let类型不可以

3、Character类型的特性

// Characters是基于Unicode的let englishLetter: Character = "a"let chineseLetter: Character = "哈"let dog: Character = "��"let coolGuy = "\u{1F60E}"

和别的语言不一样，englishLetter、chineseLetter、dog、coolGuy这几个Character的单独都为1

// String对Unicode的支持var coolLetters = "abc" //abccoolLetters.characters.count //3var chineseLetters = "你好吗" //你好吗chineseLetters.characters.count //3var coolGuys = "\u{1F60E}\u{1F60E}\u{1F60E}" //������coolGuys.characters.count //3

Swift 的Character 非常智能，便于人类对字符的理解

var cafe = "café" //cafévar cafe2 = "cafe\u{0301}" //cafécafe.characters.count //4cafe2.characters.count //4// String的比较cafe == cafe2

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