对"urlComponents"的访问重叠，但修改需要排他访问 [英] Overlapping accesses to 'urlComponents', but modification requires exclusive access

问题描述

我正在尝试在iOS 11和Swift 4上使用Lyft API，并且在第二行收到错误

I am trying to use the Lyft API with iOS 11 and Swift 4, and am receiving an error on the second line, which is

对"urlComponents"的访问重叠，但是需要修改 独占访问权；考虑复制到局部变量.

Overlapping accesses to 'urlComponents', but modification requires exclusive access; consider copying to a local variable.

我不确定这意味着什么，以及如何解决它.感谢您的任何帮助，谢谢！

I am unsure what this means, and how I can get around it. Any help is appreciated, thanks!

let queryItems = parameters
    .sorted { $0.0 < $1.0 }
    .flatMap { components(forKey: $0, value: $1) }
var urlComponents = URLComponents(url: mutableURLRequest.url!, resolvingAgainstBaseURL: false)
urlComponents?.queryItems = (urlComponents?.queryItems ?? []) + queryItems //error here

推荐答案

我想您需要先将其设置为局部变量，然后再对其进行更改，请尝试以下操作:

I guess you need to set first to a local variable and then change it , try this:

var urlComponents = URLComponents(url: mutableURLRequest.url!, resolvingAgainstBaseURL: false) 
var localVariable = urlComponents 
urlComponents?.queryItems = (localVariable?.queryItems ?? []) + queryItems  

这篇关于对"urlComponents"的访问重叠，但修改需要排他访问的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！