swift-字典
swift字典
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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
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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)");
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