Swift 错误:预期返回“字符串"的函数中缺少返回值
问题描述：
我正在尝试从 Apple 的 QuestionBot 添加编辑一些代码.我想出了这个:
I'm trying to add edit some code from Apple's QuestionBot. I came up with this:
func responseToQuestion(question: String) -> String {
if question.hasPrefix("hello") {
return "Hello"
} else if question.hasPrefix("where") {
return "There"
} else if question.hasPrefix("what"){
return "I don't know"
}
}
但是有一个错误:在预期返回字符串"的函数中缺少返回值.我该怎么办，谢谢?
But there's an error: Missing return in a function expected to return 'String'. What should I do, thanks?
答
预期返回字符串"的函数中缺少返回
Missing return in a function expected to return 'String'
应该函数 return 什么，因为你没有设置 return 如果不匹配任何一个 question.hasPrefix()
should the function return something , because you did not set return if do not match any one question.hasPrefix()
func responseToQuestion(question: String) -> String {
if question.hasPrefix("hello") {
return "Hello"
} else if question.hasPrefix("where") {
return "There"
} else if question.hasPrefix("what"){
return "I don't know"
}
return "something"
}