swift-字典

swift字典

• 在swift中，key：key值必定是可hash的，必定是獨一無二的，swift的基本數據類型（String,Int,Float）都是可哈希的，因此均可以做爲key值。 value：沒有要求

• 直接上代碼了,註釋給你們標的很明白

  //建立字典並賦值
    let dict = ["name":"xiaoyu","age":12]
    let dict2:[String:Any] = ["name":"xiaoyu","age":12];
    let dict3:Dictionary<String,Any> = ["name":"xiaoyu","age":13,"height":130]
  
    print(dict3)
  
    //建立空字典
  
    let dict4:[String:Any] = [:]
    let dict5:[String:Any] = Dictionary()
  
    //建立可變字典
    var dict6:[String:Any] = ["name":"xiaoyu"]
  
    //更新字典的數據 value輸出的是原來的key對應的value值
    if let Value = dict6.updateValue("dayu", forKey: "name")
    {
        print(Value)
        print(dict6)
    }
  
    //刪除字典元素
    dict6.removeValueForKey("name")
    //刪除所有元素
    dict6.removeAll()
    dict6.removeAll(keepCapacity: true)
    //遍歷字典
    for (key,value) in dict6
    {
        print("key:\(key) value:\(value)")
    }
  
    for key in dict6.keys{
        print("key:\(key)")
    }
  
    //合併字典
  
    var dict7:[String:Any] = ["name":"小雨","age":133]
  
    var newDict8:[String:Any] = ["weight":"小於","height":13]
    for (key,value) in newDict8{
        dict7.updateValue(value, forKey: key)
    }
  
    print("dict7:\(dict7)");