本篇内容主要讲解“如何使用swift中的Dictionary”，感兴趣的朋友不妨来看看。本文介绍的方法操作简单快捷，实用性强。下面就让小编来带大家学习“如何使用swift中的Dictionary”吧!
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//定义
var dic1 = Dictionary<String, Int>()
var dic2 = [String: Int]()
var dic3: Dictionary<String, Int> = [:]
var dic = ["zhang san": 18, "li si": 19, "wang wu": 20]print(dic.isEmpty)
//false
print(dic.count)
//3//无序遍历字典
for (key, value) in dic {
print("name: \(key), age:\(value)")
}
/*
name: li si, age:19
name: wang wu, age:20
name: zhang san, age:18
*/
//有序遍历
for key in dic.keys.sorted() {
print("name: \(key), age:\(dic[key]!)")
}
/*
name: li si, age:19
name: wang wu, age:20
name: zhang san, age:18
*///update
dic["zhang san"] = 19
print(dic)
//["li si": 19, "wang wu": 20, "zhang san": 19]
//updateValue
dic.updateValue(20, forKey: "zhang san")
print(dic)
//["li si": 19, "wang wu": 20, "zhang san": 20]//remove
dic["zhang san"] = nil
print(dic)
//["li si": 19, "wang wu": 20]
//removeValue
print(dic.removeValue(forKey: "li si"))
//Optional(19)
print(dic)
//["wang wu": 20]//merge
var mergeDic = ["a": 1, "b": 2]
mergeDic.merge(["a": 3, "c": 4]) { (current, _) in current }
print(mergeDic)
//["c": 4, "a": 1, "b": 2]
mergeDic.merge(["a": 3, "d": 6]) { (_, new) in new }
print(mergeDic)
//["b": 2, "c": 4, "a": 3, "d": 6]到此，相信大家对“如何使用swift中的Dictionary”有了更深的了解，不妨来实际操作一番吧！这里是亿速云网站，更多相关内容可以进入相关频道进行查询，关注我们，继续学习！
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原文链接：https://my.oschina.net/artwl/blog/5009522
