專案在Xcode9中執行正常，但是在Xcode10的情況下，會報如下錯誤：

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'
 

 修復流程如下：

1、依次點選[Xcode -> File ->Workspace Settings]選單。開啟如下視窗：

點選Build System tag下拉選單，然後在彈出的選單中選擇 "Legacy Build System" 選項，最後點選 "Done"按鈕。

2、使用"cmd+shift+alt+k" 快捷鍵Clean一下專案。

3、前往/Users/jerry/Library/Developer/Xcode/DerivedData目錄，清除目錄中的內容。

經過以上三個步驟即可解決這個Xcode10帶來的問題。

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