更新Xcode功炮，自然開始第一時間運行老項目冻璃，踩坑填坑

這邊記錄下基本出現(xiàn)的問題

Error: Multiple commands produce

Xcode10的更新點這里筆者不在闡述，想了解的自行Google漓雅。這邊著重提及下與本問題相關(guān)的一個更新點。

Build System

Again, Xcode 10 uses a new build system. The new build system provides improved reliability and build performance, and it catches project configuration problems that the legacy build system does not.
The legacy build system is still available in Xcode 10. To use the legacy build system, select it in the File > Project/Workspace Settings sheet. Projects configured to use the legacy build system will display an orange hammer icon in the Activity View.

簡單而言畏鼓，Xcode10使用了一個的新創(chuàng)建系統(tǒng)，比之前的提供更好的可靠性與創(chuàng)建性能壶谒，而且可以獲取項目配置問題（默認設(shè)置新創(chuàng)建系統(tǒng)）

在蘋果文檔中云矫，提及Xcode10中的關(guān)于舊項目New Build System更改適配中提及到以下兩點

The new build system has stricter checks for cycles between elements in the build in order to prevent unnecessary rebuilds.

It is an error for any individual file in the build to be produced by more than one build command. For example, if two targets each declare the same output file from a shell script phase, factor out the declaration of the output file into a single target.

New Build System會對構(gòu)建中的元素循環(huán)進行嚴格的檢查，避免不必要的重建汗菜，這個也是錯誤出現(xiàn)的原因让禀。

錯誤發(fā)生的兩種普遍形式：

1、info.plist

錯誤信息

Multiple commands produce '/Users/tjsoft/Library/Developer/Xcode/DerivedData/TYKYTwoLearnOneDo-amcfzswumxdotlgjwdslugmywxch/Build/Products/Debug-iphoneos/TYKYTwoLearnOneDo.app/Info.plist':
1) Target 'TYKYTwoLearnOneDo' (project 'TYKYTwoLearnOneDo') has copy command from '/Users/tjsoft/TYKY /黨建/黔紀/QianJiDangJian_iOS/TYKYTwoLearnOneDo/Info.plist' to '/Users/tjsoft/Library/Developer/Xcode/DerivedData/TYKYTwoLearnOneDo-amcfzswumxdotlgjwdslugmywxch/Build/Products/Debug-iphoneos/TYKYTwoLearnOneDo.app/Info.plist'
2) Target 'TYKYTwoLearnOneDo' (project 'TYKYTwoLearnOneDo') has process command with output '/Users/tjsoft/Library/Developer/Xcode/DerivedData/TYKYTwoLearnOneDo-amcfzswumxdotlgjwdslugmywxch/Build/Products/Debug-iphoneos/TYKYTwoLearnOneDo.app/Info.plist'

2陨界、Copy Pods Resources

錯誤信息

Multiple commands produce '/Users/tjsoft/Library/Developer/Xcode/DerivedData/TYKYTwoLearnOneDo-amcfzswumxdotlgjwdslugmywxch/Build/Products/Debug-iphoneos/TYKYTwoLearnOneDo.app':
1) Target 'TYKYTwoLearnOneDo' has create directory command with output '/Users/tjsoft/Library/Developer/Xcode/DerivedData/TYKYTwoLearnOneDo-amcfzswumxdotlgjwdslugmywxch/Build/Products/Debug-iphoneos/TYKYTwoLearnOneDo.app'
2) That command depends on command in Target 'TYKYTwoLearnOneDo': script phase “[CP] Copy Pods Resources”

解決方法可以有兩種巡揍，一種是不使用New Build System，在File > Project/Workspace Settings中的Share Project/Workspace Settings 里build system 將New Build System(Default)切換成Legacy build system菌瘪。

image

其次是根據(jù)出錯信息腮敌，在新創(chuàng)建系統(tǒng)模式下，去除多余的引用重建俏扩。

Info.plist

在 target -> Build phase > Copy Bundle Resource 中找到info.plist糜工，移除

image

Copy Pods Resources

在 target -> Build phase > Copy Pods Resources -> Output Files，移除${TARGET_BUILD_DIR}/${UNLOCALIZED_RESOURCES_FOLDER_PATH}

image

關(guān)于Copy Pods Resources每次pod install之后都會出現(xiàn)問題的解決方案录淡，更新cocoaPod到最新版本

gem install cocoapods --pre

需要換源的使用

gem sources --add https://gems.ruby-china.com --remove https://gems.ruby-china.org

參考文獻:

What’s new in Xcode 10?
Build System Release Notes for Xcode 10