下載了UnityARKitPlugin，編譯的時候在Xcode中鏈接的時候報錯：

Undefined symbols for architecture arm64:

? "_OBJC_CLASS_$_ARObjectScanningConfiguration", referenced from:

? ? ? objc-class-ref in ARKitNativeObjectDetection.o

? "_OBJC_CLASS_$_ARObjectAnchor", referenced from:

? ? ? objc-class-ref in ARKitNativeObjectDetection.o

? "_OBJC_CLASS_$_AREnvironmentProbeAnchor", referenced from:

? ? ? objc-class-ref in ARSessionNative.o

? ? ? objc-class-ref in AREnvironmentProbe.o

? "_OBJC_CLASS_$_ARWorldTrackingConfiguration", referenced from:

? ? ? objc-class-ref in ARSessionNative.o

? "_OBJC_CLASS_$_ARReferenceImage", referenced from:

? ? ? objc-class-ref in ARSessionNative.o

? "_OBJC_CLASS_$_AROrientationTrackingConfiguration", referenced from:

? ? ? objc-class-ref in ARSessionNative.o

? "_OBJC_CLASS_$_ARImageAnchor", referenced from:

? ? ? objc-class-ref in ARSessionNative.o

? "_OBJC_CLASS_$_ARAnchor", referenced from:

? ? ? objc-class-ref in ARSessionNative.o

? "_OBJC_CLASS_$_ARWorldMap", referenced from:

? ? ? objc-class-ref in ARWorldMap.o

? ? ? objc-class-ref in ARSessionNative.o

? ? ? objc-class-ref in ARKitNativeObjectDetection.o

? "_OBJC_CLASS_$_ARPlaneAnchor", referenced from:

? ? ? objc-class-ref in ARSessionNative.o

? "_OBJC_CLASS_$_ARSession", referenced from:

? ? ? objc-class-ref in ARSessionNative.o

? "_OBJC_CLASS_$_ARReferenceObject", referenced from:

? ? ? objc-class-ref in ARWorldMap.o

? ? ? objc-class-ref in ARSessionNative.o

? ? ? objc-class-ref in AREnvironmentProbe.o

? ? ? objc-class-ref in ARKitNativeObjectDetection.o

ld: symbol(s) not found for architecture arm64

clang: error: linker command failed with exit code 1 (use -v to see invocation)

我使用的Unity版本是2019.4。解決的方案是在Unity的菜單 window -> Package Manager里面添加了ARKit XR Plugin。