Swift 2.0学习笔记(Day 16)——字典集合
2015-09-23 10:30
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原创文章,欢迎转载。转载请注明:关东升的博客 Swift字典表示一种非常复杂的集合,允许按照某个键来访问元素。字典是由两部分集合构成的,一个是键(key)集合,一个是值(value)集合。键集合是不能有重复元素的,而值集合是可以重复的,键和值是成对出现的。字典声明与初始化 Swift字典类型是Dictionary,也是一个泛型集合。 在声明一个Dictionary类型的时候可以使用下面的语句之一。
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)
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var studentDictionary1: Dictionary<Int, String> var studentDictionary2: [Int: String]声明的字典需要进行初始化才能使用,字典类型往往是在声明的同时进行初始化的。示例代码如下:
var studentDictionary1: Dictionary<Int, String> Ê= [102 : "张三",105 : "李四", 109 : "王五"] var studentDictionary2 = [102 : "张三",105 : "李四", 109 : "王五"] let studentDictionary3 = [102 : "张三",105 : "李四", 109 : "王五"]字典遍历 字典遍历过程可以只遍历值的集合,也可以只遍历键的集合,也可以同时遍历。这些遍历过程都是通过for-in循环实现的。 下面是遍历字典的示例代码:
var studentDictionary = [102 : "张三",105 : "李四", 109 : "王五"] print("---遍历键---") for studentID in studentDictionary.keys { print("学号:\(studentID)") } print("---遍历值---") for studentName in studentDictionary.values { print("学生:\(studentName)") } print("---遍历键:值---") for (studentID, studentName) in studentDictionary { print ("\(studentID) : \(studentName)") }运行结果如下:---遍历键---学号:105学号:102学号:109---遍历值---学生:李四学生:张三学生:王五---遍历键:值---105 : 李四102 : 张三109 : 王五
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