Swift 因为UI_USER_INTERFACE_IDIOM(

Please submit a bug report (https://swift.org/contributing/#reporting-bugs) and include the project and the crash backtrace.
Stack dump:
0.  Program arguments: /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/swift-frontend -frontend -c -primary-file /Users/xxx/Library/Developer/Xcode/DerivedData/iosapp-gnqfhkicbkgcmtacvhhuiwwskazj/Build/Intermediates.noindex/ArchiveIntermediates/iosapp/IntermediateBuildFilesPath/Pods.build/Release-iphoneos/ZLPhotoBrowser.build/Objects-normal/arm64/ZLThumbnailViewController.bc -embed-bitcode -target arm64-apple-ios10.0 -Xllvm -aarch64-use-tbi -O -disable-llvm-optzns -module-name ZLPhotoBrowser -o /Users/xxx/Library/Developer/Xcode/DerivedData/iosapp-gnqfhkicbkgcmtacvhhuiwwskazj/Build/Intermediates.noindex/ArchiveIntermediates/iosapp/IntermediateBuildFilesPath/Pods.build/Release-iphoneos/ZLPhotoBrowser.build/Objects-normal/arm64/ZLThumbnailViewController.o
1.  Apple Swift version 5.6 (swiftlang-5.6.0.323.62 clang-1316.0.20.8)
2.  Compiling with the current language version
3.  Running pass 'Function Pass Manager' on module '/Users/xxx/Library/Developer/Xcode/DerivedData/iosapp-gnqfhkicbkgcmtacvhhuiwwskazj/Build/Intermediates.noindex/ArchiveIntermediates/iosapp/IntermediateBuildFilesPath/Pods.build/Release-iphoneos/ZLPhotoBrowser.build/Objects-normal/arm64/ZLThumbnailViewController.bc'.
4.  Running pass 'ObjC ARC contraction' on function '@UI_USER_INTERFACE_IDIOM'

起始：
很莫名其妙，当时心里一惊，难道做了那么久，最后做了一个无法打包的app......
后来终于发现了问题，UI_USER_INTERFACE_IDIOM ()，我用来判断了设备是否是iPad......

解决：
在项目里跳到UI_USER_INTERFACE_IDIOM里看到了如下

/* The UI_USER_INTERFACE_IDIOM() function is provided for use when deploying to a 
version of the iOS less than 3.2. If the earliest version of iPhone/iOS that you will be 
deploying for is 3.2 or greater, you may use -[UIDevice userInterfaceIdiom] directly.
 */
@available(iOS, introduced: 2.0, deprecated: 13.0, message: "Use -[UIDevice userInterfaceIdiom] directly.")
public func UI_USER_INTERFACE_IDIOM() -> UIUserInterfaceIdiom

所以最后 将UI_USER_INTERFACE_IDIOM 用UIDevice.current.userInterfaceIdiom替换，再次打包，就成功了。