swift-字典

swift字典

• 在swift中，key：key值一定是可hash的，一定是独一无二的，swift的基本数据类型（String,Int,Float）都是可哈希的，所以都可以作为key值。 value：没有要求

• 直接上代码了,注释给大家标的很明白

  //创建字典并赋值
  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)

  //创建空字典

  let dict4:[String:Any] = [:]
  let dict5:[String:Any] = Dictionary()

  //创建可变字典
  var dict6:[String:Any] = ["name":"xiaoyu"]

  //更新字典的数据 value输出的是原来的key对应的value值
  if let Value = dict6.updateValue("dayu", forKey: "name")
  {
  print(Value)
  print(dict6)
  }

  //删除字典元素
  dict6.removeValueForKey("name")
  //删除全部元素
  dict6.removeAll()
  dict6.removeAll(keepCapacity: true)
  //遍历字典
  for (key,value) in dict6
  {
  print("key:(key) value:(value)")
  }

  for key in dict6.keys{
  print("key:(key)")
  }

  //合并字典

  var dict7:[String:Any] = ["name":"小雨","age":133]

  var newDict8:[String:Any] = ["weight":"小于","height":13]
  for (key,value) in newDict8{
  dict7.updateValue(value, forKey: key)
  }

  print("dict7:(dict7)");