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問題描繪

在Unity導出的IOS項目中停止開發時，自定義的視圖中運用SceneKit時報錯：

ld: warning: arm64 function not 4-byte aligned: ltmp0 from /Users/hustlion/idc/20161217園博園/HolyEvilCapture/Libraries/libiPhone-lib.a(unWind_test_arm64.o)
ld: warning: arm64 function not 4-byte aligned: _unWind_tester from /Users/hustlion/idc/20161217園博園/HolyEvilCapture/Libraries/libiPhone-lib.a(unWind_test_arm64.o)
Undefined symbols for architecture arm64:
  "_OBJC_CLASS_$_SCNLight", referenced from:
      objc-class-ref in playerInfoViewController.o
  "_OBJC_CLASS_$_SCNCamera", referenced from:
      objc-class-ref in playerInfoViewController.o
  "_SCNLightTypeOmni", referenced from:
      -[playerInfoViewController addScene] in playerInfoViewController.o
  "_OBJC_CLASS_$_SCNNode", referenced from:
      objc-class-ref in playerInfoViewController.o
  "_OBJC_CLASS_$_SCNScene", referenced from:
      objc-class-ref in playerInfoViewController.o
  "_SCNLightTypeAmbient", referenced from:
      -[playerInfoViewController addScene] in playerInfoViewController.o
ld: symbol(s) not found for architecture arm64
clang: error: linker command failed with exit code 1 (use -v to see invocation)

緣由剖析

筆者在獨自寫UI界面（沒有與Unity整合時），運用SceneKit只需求援用對應的頭文件。但是與Unity整合後，發現需求在Build Phases中引入SceneKit.framework才干正常編譯。能夠是Unity導進項目的某些編譯設定招致了要額定引入SceneKit.framework才干運用SceneKit。

處理方法

在Build Phases中引入SceneKit.framework，如圖所示：

小結

遇到Undefined symbols for architecture arm64: "_OBJC_CLASS_$_SCNLight"相似的錯誤時，可以先思索能否有相應的framework可以引入。

參考 IOS編譯報錯：objc-class-ref in AppDelegate.o之處理方案 Xcode7 iOS 中的 armv7,armv7s,arm64,i386,x86_64 都是什麼 No architectures to compile for (ONLY_ACTIVE_ARCH=YES, active arch=x86_64, VALID_ARCHS=armv7 armv7s)

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