swift-字典

swift字典

• 在swift中，key：key值一定是可hash的，一定是獨一無二的，swift的基本數據類型（String,Int,Float）都是可哈希的，所以都可以作為key值。 value：沒有要求

• 直接上代碼了,註釋給大家標的很明白

  //創建字典並賦值
  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)
  
  //創建空字典
  
  let dict4:[String:Any] = [:]
  let dict5:[String:Any] = Dictionary()
  
  //創建可變字典
  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")
  //刪除全部元素
  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)");