我开始学习swift是通过苹果公司提供的swift上的iBook-The swift Programming Language。这本书说要创建一个空字典，应该使用[:]，就像声明数组为[]一样:
我声明一个空数组，如下所示:
let emptyArr = [] // or String[]()
但是在声明空字典时，我得到语法错误:
let emptyDict = [:]
如何声明一个空字典?
当前回答
你可以像这样简单地声明它:
var emptyDict:NSMutableDictionary = [:]
其他回答
斯威夫特4
let dicc = NSDictionary()
//MARK: - This is empty dictionary
let dic = ["":""]
//MARK:- This is variable dic means if you want to put variable
let dic2 = ["":"", "":"", "":""]
//MARK:- Variable example
let dic3 = ["name":"Shakeel Ahmed", "imageurl":"https://abc?abc.abc/etc", "address":"Rawalpindi Pakistan"]
//MARK: - This is 2nd Variable Example dictionary
let dic4 = ["name": variablename, "city": variablecity, "zip": variablezip]
//MARK:- Dictionary String with Any Object
var dic5a = [String: String]()
//MARK:- Put values in dic
var dic5a = ["key1": "value", "key2":"value2", "key3":"value3"]
var dic5b = [String:AnyObject]()
dic5b = ["name": fullname, "imageurl": imgurl, "language": imgurl] as [String : AnyObject]
or
//MARK:- Dictionary String with Any Object
let dic5 = ["name": fullname, "imageurl": imgurl, "language": imgurl] as [String : AnyObject]
//MARK:- More Easy Way
let dic6a = NSDictionary()
let dic6b = NSMutalbeDictionary()
你可以像这样简单地声明它:
var emptyDict:NSMutableDictionary = [:]
用这个会有用的。
var emptyDict = [String: String]()
Swift文档推荐用以下方式初始化一个空Dictionary:
var emptyDict = [String: String]()
当我第一次遇到这个问题时，我有点困惑，因为不同的答案显示了初始化空Dictionary的不同方法。事实证明，实际上有很多方法可以做到这一点，尽管考虑到Swift推断类型的能力，有些方法有点冗余或过于冗长。
var emptyDict = [String: String]()
var emptyDict = Dictionary<String, String>()
var emptyDict: [String: String] = [:]
var emptyDict: [String: String] = [String: String]()
var emptyDict: [String: String] = Dictionary<String, String>()
var emptyDict: Dictionary = [String: String]()
var emptyDict: Dictionary = Dictionary<String, String>()
var emptyDict: Dictionary<String, String> = [:]
var emptyDict: Dictionary<String, String> = [String: String]()
var emptyDict: Dictionary<String, String> = Dictionary<String, String>()
在你有一个空字典之后，你可以像这样添加一个键值对:
emptyDict["some key"] = "some value"
如果你想再次清空你的字典，你可以做以下事情:
emptyDict = [:]
类型仍然是<String, String>，因为这是它初始化的方式。
var dictList = String: swift中字典的字符串 var arrSectionTitle =字符串数组在swift
