swift Character类型详解及实例分享

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 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 = "cafeu{0301}" //café  cafe.characters.count //4  cafe2.characters.count //4      // String的比较  cafe == cafe2    

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