本文介绍了致命错误:意外地找到nil,同时解开一个可选的值(是的,再次)的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
pastebin/AC5qJ1b3
似乎发生在
let voca = Vocaloid(name: name!, vocaloidName: vocaID!)和
parseVocaloidCSV()任何想法?
这个错误总是发现我的生活。我深深的讨厌
This error always finds away into my life. I hate it deeply.
推荐答案如果您使用!尝试用?替换所有!,并获取您的代码进行编译。您可能需要重新排列一些东西。
if you use ! you can get these. Try replacing all ! with ? and getting your code to compile. You may have to rearrange things a bit.
有时您可以使用 ?? nil合并运算符。例如,在您的代码中,如果 name 是 nil ,可以将其替换为默认值(例如 no name?
Sometimes you can use the ?? nil coalescing operator. For example, in your code, if name is nil, is it acceptable to replace it with a default value such as "no name"?
let voca = Vocaloid(name: name ?? "no name", vocaloidName: vocaID ?? -1 )
或正如Midhun MP所建议的,当任何其他参数为nil时,使 voca = nil
let voca:Vocaloid? if let name = name, vocaID = vocaID { voca = Vocaloid( name:name, vocaloidName:vocaID ) } else { voca = nil }或: / p>
or:
let voca = (name != nil && vocaID != nil) ? Vocaloid( name:name!, vocaloidName:vocaID! ) : nil更多推荐
致命错误:意外地找到nil,同时解开一个可选的值(是的,再次)
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