Flutter 项目运行提示CDN: trunk URL cou

Flutter 项目运行，报如下的错误：

    CDN: trunk URL couldn't be downloaded: https://cdn.jsdelivr.net/cocoa/Specs/d/d/6/ReachabilitySwift/4.2.1/ReachabilitySwift.podspec.json Response: Timeout was reached
    CDN: trunk URL couldn't be downloaded: https://cdn.jsdelivr.net/cocoa/Specs/d/d/6/ReachabilitySwift/4.3.0/ReachabilitySwift.podspec.json Response: Timeout was reached
    CDN: trunk URL couldn't be downloaded: https://cdn.jsdelivr.net/cocoa/Specs/d/d/6/ReachabilitySwift/4.3.1/ReachabilitySwift.podspec.json Response: Timeout was reached
    CDN: trunk URL couldn't be downloaded: https://cdn.jsdelivr.net/cocoa/Specs/d/d/6/ReachabilitySwift/5.0.0/ReachabilitySwift.podspec.json Response: Timeout was reached
    CDN: trunk URL couldn't be downloaded: https://cdn.jsdelivr.net/cocoa/Specs/d/d/6/ReachabilitySwift/5.0.0-beta1/ReachabilitySwift.podspec.json Response: Timeout was reached

直接在命令行中进入到iOS项目的路径下：

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执行pod install
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如果出现上面的错误，说明需要更新本地repo，可以执行pod repo update
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在更新repo的过程中，可能依然会报如下错误：
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然后执行 pod repo list
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可以看到trunk这个库，执行pod repo remove trunk将他删掉
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再执行pod repo list 查看一下：
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再习惯性的pwd和ls，确认想当前路径无误：
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执行pod install
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