Xcode 10 的错误: Multiple commands produce

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项目在Xcode9中运行正常，但是在Xcode10的情况下，会报如下错误：

error: Multiple commands produce '/Users/uesr/Library/Developer/Xcode/DerivedData/OptimalLive-fxatvygbofczeyhjsawtebkimvwx/Build/Products/Debug-iphoneos/OptimalLive.app/Info.plist':
1) Target 'OptimalLive' has copy command from '/Users/uesr/Desktop/workSpace/SEALIVE/SeaLive1.1/OptimalLive/Info.plist' to '/Users/uesr/Library/Developer/Xcode/DerivedData/OptimalLive-fxatvygbofczeyhjsawtebkimvwx/Build/Products/Debug-iphoneos/OptimalLive.app/Info.plist'
2) Target 'OptimalLive' has copy command from '/Users/uesr/Desktop/workSpace/SEALIVE/SeaLive1.1/OptimalLive/Server/Masonry/Info.plist' to '/Users/uesr/Library/Developer/Xcode/DerivedData/OptimalLive-fxatvygbofczeyhjsawtebkimvwx/Build/Products/Debug-iphoneos/OptimalLive.app/Info.plist'
3) Target 'OptimalLive' has process command with input '/Users/uesr/Desktop/workSpace/SEALIVE/SeaLive1.1/OptimalLive/Info.plist'

 修复流程如下：

1、依次点击[Xcode -> File ->Workspace Settings]菜单。打开如下窗口：

点击Build System tag下拉菜单，然后在弹出的菜单中选择 "Legacy Build System" 选项，最后点击 "Done"按钮。

2、使用"cmd+shift+alt+k" 快捷键Clean一下项目。

3、前往/Users/jerry/Library/Developer/Xcode/DerivedData目录，清除目录中的内容。

经过以上三个步骤即可解决这个Xcode10带来的问题。

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