ios Swift 错误：变量在其自己的初始值内使用
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Swift Error: Variable used within its own initial value
提问by Francescu
When I'm initializing an instance of an entity I'm getting the error Variable used within its own initial value.
当我初始化一个实体的实例时，我收到了错误Variable used within its own initial value。
Here is the code throwing the error:
这是抛出错误的代码：
class func buildWordDefinition (word:String, language:Language, root:TBXMLElement) -> WordDefinition
{
let word = WordDefinition(word: word, language: language)
The error points at the wordvariable.
错误指向word变量。
Here is the WordDefinition class:
这是 WordDefinition 类：
class WordDefinition {
let word: String
let language: Language
init(word: String, language:Language)
{
self.word = word
self.language = language
}
}
What does this error mean ?
这个错误是什么意思 ？
回答by Cezar
You are declaring a constant named word, and trying to use the argument with the same name to initialize it. The compiler tries to use the just declared constant to assign its own initial value, instead of using the argument.
您正在声明一个名为 的常量word，并尝试使用具有相同名称的参数来初始化它。编译器尝试使用刚刚声明的常量来分配它自己的初始值，而不是使用参数。
回答by Shrawan
I have faced same error when missing out ifwhile unwrapping the text .
如果在展开文本时错过了，我也遇到了同样的错误。
By adding if resolved above issue.
通过添加如果解决了上述问题。
回答by Rod
You are redefining a constant wordwhich has the same name as a parameter within your function
您正在重新定义word与函数中的参数同名的常量
class func buildWordDefinition (word:String, language:Language, root:TBXMLElement) -> WordDefinition
{
// same name as the parameter here
let word = WordDefinition(word: word, language: language)
}
回答by gwcoffey
You have a function parameter called wordin scope and you're trying to create a constant with the same name. Name your constant something other than word.
您有一个word在作用域中调用的函数参数，并且您正在尝试创建一个具有相同名称的常量。将常量命名为word.
