報錯：duplicate symbol _main in:

duplicate symbol _main in:
/Users/gavin/Library/Developer/Xcode/DerivedData/EnglishHeadline-gpiuxsetwvexoqadnljzwzgqvrwf/Build/Intermediates/EnglishHeadline.build/Debug-iphoneos/EnglishHeadline.build/Objects-normal/arm64/main-91435712FE5AEA2B.o
/Users/gavin/Library/Developer/Xcode/DerivedData/EnglishHeadline-gpiuxsetwvexoqadnljzwzgqvrwf/Build/Intermediates/EnglishHeadline.build/Debug-iphoneos/EnglishHeadline.build/Objects-normal/arm64/main-D3BB34C894BCAB32.o
duplicate symbol _main in:
/Users/gavin/Library/Developer/Xcode/DerivedData/EnglishHeadline-gpiuxsetwvexoqadnljzwzgqvrwf/Build/Intermediates/EnglishHeadline.build/Debug-iphoneos/EnglishHeadline.build/Objects-normal/arm64/main-91435712FE5AEA2B.o
/Users/gavin/Library/Developer/Xcode/DerivedData/EnglishHeadline-gpiuxsetwvexoqadnljzwzgqvrwf/Build/Intermediates/EnglishHeadline.build/Debug-iphoneos/EnglishHeadline.build/Objects-normal/arm64/main-9B397D594F78D06B.o
ld: 2 duplicate symbols for architecture arm64
clang: error: linker command failed with exit code 1 (use -v to see invocation)

2 duplicate symbols for architecture arm64，看到這個首先想到的是你工程中的庫是否支持64位？然后在圖中所示紅線出進行相應的修改

原因是main重復導入，工程里面出現了三個main，然后刪掉了兩個，運行成功了

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