最近开发一直在使用Xcode10 beta版本的，今天升级到Xcode10 beta3，但是在编译项目时编译失败，报错内容:

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`error: Multiple commands produce &lt;span class="hljs-string">'/Users/xiaoyuan/Library/Developer/Xcode/DerivedData/Boobuz-gnxeuntgkenwgdgycqnvabqubafh/Build/Products/Debug-iphoneos/Boobuz.app'&lt;/span>:
1) Target &lt;span class="hljs-string">'Boobuz'&lt;/span> has create directory &lt;span class="hljs-built_in">command&lt;/span> with output &lt;span class="hljs-string">'/Users/xiaoyuan/Library/Developer/Xcode/DerivedData/Boobuz-gnxeuntgkenwgdgycqnvabqubafh/Build/Products/Debug-iphoneos/Boobuz.app'&lt;/span>
2) That &lt;span class="hljs-built_in">command&lt;/span> depends on &lt;span class="hljs-built_in">command&lt;/span> &lt;span class="hljs-keyword">in&lt;/span> Target &lt;span class="hljs-string">'Boobuz'&lt;/span>: script phase “[CP] Copy Pods Resources”
`

引用简友[guifu_tang](/u/3b14b90a886f)的一句话原因是Xcode 10 默认使用的build system是New build system，与Xcode9不同导致。




- 第一种方法 不修改build system

分析build error 日志，错误发生在Copy Pods Resources，而且与output有关，应该是使用了cocoapods导致的，尝试删除该项目target-Copy Pods Resources-Output Files，成功解决问题。

Build phase -> Copy Pods Resources -> Output Files -> 移除${TARGET_BUILD_DIR}/${UNLOCALIZED_RESOURCES_FOLDER_PATH} -> Build " data-snippet-id="ext.56fe38509dd0748880ce2c86d42c91e7" data-snippet-saved="false" data-codota-status="done">`选中项目target -&gt; Build phase -&gt; Copy Pods Resources -&gt; Output Files -&gt; 移除&lt;span class="hljs-variable">${TARGET_BUILD_DIR}&lt;/span>/&lt;span class="hljs-variable">${UNLOCALIZED_RESOURCES_FOLDER_PATH}&lt;/span> -&gt; Build
`

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- 第二种方法 修改build system

在Xcode菜单栏 -> File -> Workspace Setting，将build system修改为legacy build system，然后clean后编译。

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在xcode 10中png图片问题的话，设置下compile png为no就可以了

转自：https://www.jianshu.com/p/8a8444acdca5

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