编译器无法在合理的时间对该表达式进行类型检查；尝试将表达式分解为不同的子表达式 [英] The compiler is unable to type-check this expression in reasonable time; try breaking up the expression into distinct sub-expressions

问题描述

我是Ios编程的新手，以下表示出了错误:

I am new in Ios programming and the below expressing is giving an error:

let combine = date.enumerated().map {index, date in
 return (date,self.arrFriendId[index],self.arrFriendName[index],self.arrFriendImage[index],self.arrMsgType[index],self.arrMessage[index], self.arrLastMsgTime[index], self.arrNotifyStatus[index])}

请帮助我解决这个问题.预先感谢

please help me to solve this. thanks in advance

推荐答案

当单个表达式执行大量操作时，通常会发生此错误.因此，编译器告诉您将其分解为子表达式.

This error generally occurs when a single expression is doing a lot of things. So compiler tells you to break it to sub-expressions.

假设您想要类型为 Array< Any> 的输出 combine ，则可以这样操作:

Assuming you want the output combine of type Array<Any>, You can do it like this:

let combine = date.enumerated().map { index, date -> Any in
    let id = self.arrFriendId[index]
    let name = self.arrFriendName[index]
    let image = self.arrFriendImage[index]
    let messageType = self.arrMsgType[index]
    let message = self.arrMessage[index]
    let messageTime = self.arrLastMsgTime[index]
    let status = self.arrNotifyStatus[index]
    return (date, id, name, image, messageType, message, messageTime, status)
}

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