swift Character类型详解及实例
swift Character类型详解及实例
1、遍历字符串
// for-in 遍历String for 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" //abc coolLetters.characters.count //3 var chineseLetters = "你好吗" //你好吗 chineseLetters.characters.count //3 var 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" //café var cafe2 = "cafe\u{0301}" //café cafe.characters.count //4 cafe2.characters.count //4 // String的比较 cafe == cafe2
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