ios 在 Swift 中将对象设置为空的 NSDictionary
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Set objects to empty NSDictionary in Swift
提问by NNikN
I can create an NSDictionary
我可以创建一个 NSDictionary
var namesDictionary=Dictionary<String,String>()
namesDictionary["Jacob"] = "Marry"
But, when I create a empty dictionary like coded below, line 1 i okie, but line 2 (adding values) throws an error.
但是，当我创建一个像下面编码的空字典时，第 1 行我没问题，但是第 2 行（添加值）会引发错误。
var namesDictionary =[:]
namesDictionary["Jacob"] = "Marry"
Error is "Cannot assign to the result of this expression". Is there any other way to assign the values.
错误是“无法分配给此表达式的结果”。有没有其他方法来分配值。
回答by Connor
It looks like it's an issue with swift interpreting the type of your dictionary. Try explicitly typing your empty dictionary.
看起来这是快速解释字典类型的问题。尝试明确键入您的空字典。
var namesDictionary: Dictionary<String, String> = [:]
namesDictionary["Jacob"] = "Marry"
I think a better use for [:]is for emptying an already defined dictionary. If you add a third line namesDictionary = [:], you will be able to call namesDictionary["Jacob"] = "Marry"again since the compiler knows what type of dictionary it is from the inital declaration.
我认为更好的用途[:]是清空已经定义的字典。如果添加第三行namesDictionary = [:]，您将能够namesDictionary["Jacob"] = "Marry"再次调用，因为编译器从初始声明中知道它是什么类型的字典。
