Swift和Core-Data，类类型作为参数

时间：2015-07-02 10:00:45

标签： swift core-data

使用Swift和Core-Data，我有以下功能，这对于在实体中插入新记录很有用：

func insertObject (entityName: String, dico: NSDictionary) {
    var newItem = NSEntityDescription.insertNewObjectForEntityForName(entityName, inManagedObjectContext:managedObjectContext!) as! EventList

    for (key, value) in dico {
        newItem.setValue(value, forKey: key as! String)
    }

    var error : NSError? = nil
    managedObjectContext!.save(&error)
}

虽然它有效，但有一个问题：类型＆＃34; EventList＆＃34;在函数中是硬编码的，如果我想要一般用途的功能，这是不好的。 理想情况下，我想传递一个参数：type到函数，然后使用它代替＆＃34; EventList＆＃34;。

这可能吗？怎么样？我在网上发现的内容似乎并不清楚，并且在我现在的Swift知识的极限下。

===进一步实验后更新===

根据一些建议，我从反馈中得到了一些建议，在看了泛型的工作原理后，我重新编写了我的功能如下：

func insertObject <T:NSManagedObject> (entityName:String,dico:NSDictionary) {
    var newItem = NSEntityDescription.insertNewObjectForEntityForName(entityName, inManagedObjectContext:managedObjectContext!) as! T
    for (key, value) in dico {
        newItem.setValue(value, forKey: key as! String)
    }

    var error : NSError? = nil
    managedObjectContext!.save(&error)
}

我没有在特定代码行上收到任何错误，但在问题导航器中收到以下重大错误消息：

  

CompileSwift正常armv7   /Users/abcxyz/Documents/iOS/LibBin/Swift_CoreDataBox/CoreDataBox.swift       cd / Users / abcxyz / Documents / iOS / MyAp       /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/swift   -frontend -c -primary-file /Users/abcxyz/Documents/iOS/LibBin/Swift_CoreDataBox/CoreDataBox.swift   /Users/abcxyz/Documents/iOS/MyAp/MyAp/RootViewController.swift   /Users/abcxyz/Documents/iOS/MyAp/MyAp/ModelController.swift   /Users/abcxyz/Documents/iOS/MyAp/MyAp/DataViewController.swift   /Users/abcxyz/Documents/iOS/MyAp/MyAp/MyAp.swift   /Users/abcxyz/Documents/iOS/MyAp/MyAp/AppDelegate.swift   /Users/abcxyz/Documents/iOS/MyAp/MyAp/DataInput_ViewController.swift   -target armv7-apple-ios7.1 -enable-objc-interop -sdk /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS8.3.sdk   -I / Users / abcxyz / Library / Developer / Xcode / DerivedData / MyAp-ehmiuzpyuhwbkpfvduswfbhkdjut / Build / Products / Debug-iphoneos   -F / Users / abcxyz / Library / Developer / Xcode / DerivedData / MyAp-ehmiuzpyuhwbkpfvduswfbhkdjut / Build / Products / Debug-iphoneos   -g -module-cache-path / Users / abcxyz / Library / Developer / Xcode / DerivedData / ModuleCache   -serialize-debugging-options -Xcc -I / Users / abcxyz / Library / Developer / Xcode / DerivedData / MyAp-ehmiuzpyuhwbkpfvduswfbhkdjut / Build / Intermediates / MyAp.build / Debug-iphoneos / MyAp.build / swift-overrides.hmap   -Xcc -iquote -Xcc /Users/abcxyz/Library/Developer/Xcode/DerivedData/MyAp-ehmiuzpyuhwbkpfvduswfbhkdjut/Build/Intermediates/MyAp.build/Debug-iphoneos/MyAp.build/MyAp-generated-files.hmap   -Xcc -I / Users / abcxyz / Library / Developer / Xcode / DerivedData / MyAp-ehmiuzpyuhwbkpfvduswfbhkdjut / Build / Intermediates / MyAp.build / Debug-iphoneos / MyAp.build / MyAp-own-target-headers.hmap   -Xcc -I / Users / abcxyz / Library / Developer / Xcode / DerivedData / MyAp-ehmiuzpyuhwbkpfvduswfbhkdjut / Build / Intermediates / MyAp.build / Debug-iphoneos / MyAp.build / MyAp-all-target-headers.hmap   -Xcc -iquote -Xcc /Users/abcxyz/Library/Developer/Xcode/DerivedData/MyAp-ehmiuzpyuhwbkpfvduswfbhkdjut/Build/Intermediates/MyAp.build/Debug-iphoneos/MyAp.build/MyAp-project-headers.hmap   -Xcc -I / Users / abcxyz / Library / Developer / Xcode / DerivedData / MyAp-ehmiuzpyuhwbkpfvduswfbhkdjut / Build / Products / Debug-iphoneos / include   -Xcc -I / Applications / Xcode.app / Contents / Developer / Toolchains / XcodeDefault.xctoolchain / usr / include   -Xcc -I / Users / abcxyz / Library / Developer / Xcode / DerivedData / MyAp-ehmiuzpyuhwbkpfvduswfbhkdjut / Build / Intermediates / MyAp.build / Debug-iphoneos / MyAp.build / DerivedSources / armv7   -Xcc -I / Users / abcxyz / Library / Developer / Xcode / DerivedData / MyAp-ehmiuzpyuhwbkpfvduswfbhkdjut / Build / Intermediates / MyAp.build / Debug-iphoneos / MyAp.build / DerivedSources   -Xcc -DDEBUG = 1 -Xcc -working-directory / Users / abcxyz / Documents / iOS / MyAp -emit-module-doc-path / Users / abcxyz / Library / Developer / Xcode / DerivedData / MyAp-ehmiuzpyuhwbkpfvduswfbhkdjut / Build / Intermediates /MyAp.build/Debug-iphoneos/MyAp.build/Objects-normal/armv7/CoreDataBox~partial.swiftdoc -Onone -module-name Me -emit-module-path / Users / abcxyz / Library / Developer / Xcode / DerivedData / MYAP-ehmiuzpyuhwbkpfvduswfbhkdjut /建造/中间体/ MyAp.build /调试-的iPhoneOS / MyAp.build /对象 - 正常/ ARMv7的/ CoreDataBox〜partial.swiftmodule   -serialize-diagnostics-path /Users/abcxyz/Library/Developer/Xcode/DerivedData/MyAp-ehmiuzpyuhwbkpfvduswfbhkdjut/Build/Intermediates/MyAp.build/Debug-iphoneos/MyAp.build/Objects-normal/armv7/CoreDataBox.dia   -emit-dependencies-path /Users/abcxyz/Library/Developer/Xcode/DerivedData/MyAp-ehmiuzpyuhwbkpfvduswfbhkdjut/Build/Intermediates/MyAp.build/Debug-iphoneos/MyAp.build/Objects-normal/armv7/CoreDataBox.d   -emit-reference-dependencies-path /Users/abcxyz/Library/Developer/Xcode/DerivedData/MyAp-ehmiuzpyuhwbkpfvduswfbhkdjut/Build/Intermediates/MyAp.build/Debug-iphoneos/MyAp.build/Objects-normal/armv7/CoreDataBox.swiftdeps   -o /Users/abcxyz/Library/Developer/Xcode/DerivedData/MyAp-ehmiuzpyuhwbkpfvduswfbhkdjut/Build/Intermediates/MyAp.build/Debug-iphoneos/MyAp.build/Objects-normal/armv7/CoreDataBox.o

     

0 swift 0x00000001007e92b8   llvm :: sys :: PrintStackTrace（__ sFILE *）+ 40 1 swift
  0x00000001007e9794 SignalHandler（int）+ 452 2   libsystem_platform.dylib 0x00007fff96272f1a _sigtramp + 26 3   libsystem_platform.dylib 0x7994a32ea448635d _sigtramp + 237057117 4   swift 0x000000010016c076   SWIFT :: irgen :: emitPolymorphicArguments（SWIFT :: irgen :: IRGenFunction和放大器;，   迅速:: CanTypeWrapper，   迅速:: CanTypeWrapper，   llvm :: ArrayRef，swift :: irgen :: Explosion＆amp;）+ 630 5   swift 0x00000001001b6d0f   swift :: SILVisitor＆lt;（匿名命名空间）:: IRGenSILFunction，   void＆gt; :: visit（swift :: ValueBase *）+ 40287 6 swift
  0x00000001001ac39d   swift :: irgen :: IRGenModule :: emitSILFunction（swift :: SILFunction *）+ 9901   7 swift 0x0000000100116f4f   swift :: irgen :: IRGenModule :: emitGlobalTopLevel（）+ 159 8 swift
  0x0000000100196c59 performIRGeneration（swift :: IRGenOptions＆amp ;,,   swift :: Module *，swift :: SILModule *，llvm :: StringRef，   llvm :: LLVMContext＆amp;，swift :: SourceFile *，unsigned int）+ 2121 9 swift   0x0000000100197693 swift :: performIRGeneration（swift :: IRGenOptions＆amp;，   swift :: SourceFile＆amp;，swift :: SILModule *，llvm :: StringRef，   llvm :: LLVMContext＆amp;，unsigned int）+ 51 10 swift
  0x00000001000d3087 frontend_main（llvm :: ArrayRef，char   const *，void *）+ 6647 11 swift 0x00000001000d14e6   main + 1814 12 libdyld.dylib 0x00007fff947a35c9 start + 1   13 libdyld.dylib 0x0000000000000041 start + 1803930233   堆栈转储：   0.程序参数：/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/swift   -frontend -c -primary-file /Users/abcxyz/Documents/iOS/LibBin/Swift_CoreDataBox/CoreDataBox.swift   /Users/abcxyz/Documents/iOS/MyAp/MyAp/RootViewController.swift   /Users/abcxyz/Documents/iOS/MyAp/MyAp/ModelController.swift   /Users/abcxyz/Documents/iOS/MyAp/MyAp/DataViewController.swift   /Users/abcxyz/Documents/iOS/MyAp/MyAp/MyAp.swift   /Users/abcxyz/Documents/iOS/MyAp/MyAp/AppDelegate.swift   /Users/abcxyz/Documents/iOS/MyAp/MyAp/DataInput_ViewController.swift   -target armv7-apple-ios7.1 -enable-objc-interop -sdk /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS8.3.sdk   -I / Users / abcxyz / Library / Developer / Xcode / DerivedData / MyAp-ehmiuzpyuhwbkpfvduswfbhkdjut / Build / Products / Debug-iphoneos   -F / Users / abcxyz / Library / Developer / Xcode / DerivedData / MyAp-ehmiuzpyuhwbkpfvduswfbhkdjut / Build / Products / Debug-iphoneos   -g -module-cache-path / Users / abcxyz / Library / Developer / Xcode / DerivedData / ModuleCache   -serialize-debugging-options -Xcc -I / Users / abcxyz / Library / Developer / Xcode / DerivedData / MyAp-ehmiuzpyuhwbkpfvduswfbhkdjut / Build / Intermediates / MyAp.build / Debug-iphoneos / MyAp.build / swift-overrides.hmap   -Xcc -iquote -Xcc /Users/abcxyz/Library/Developer/Xcode/DerivedData/MyAp-ehmiuzpyuhwbkpfvduswfbhkdjut/Build/Intermediates/MyAp.build/Debug-iphoneos/MyAp.build/MyAp-generated-files.hmap   -Xcc -I / Users / abcxyz / Library / Developer / Xcode / DerivedData / MyAp-ehmiuzpyuhwbkpfvduswfbhkdjut / Build / Intermediates / MyAp.build / Debug-iphoneos / MyAp.build / MyAp-own-target-headers.hmap   -Xcc -I / Users / abcxyz / Library / Developer / Xcode / DerivedData / MyAp-ehmiuzpyuhwbkpfvduswfbhkdjut / Build / Intermediates / MyAp.build / Debug-iphoneos / MyAp.build / MyAp-all-target-headers.hmap   -Xcc -iquote -Xcc /Users/abcxyz/Library/Developer/Xcode/DerivedData/MyAp-ehmiuzpyuhwbkpfvduswfbhkdjut/Build/Intermediates/MyAp.build/Debug-iphoneos/MyAp.build/MyAp-project-headers.hmap   -Xcc -I / Users / abcxyz / Library / Developer / Xcode / DerivedData / MyAp-ehmiuzpyuhwbkpfvduswfbhkdjut / Build / Products / Debug-iphoneos / include   -Xcc -I / Applications / Xcode.app / Contents / Developer / Toolchains / XcodeDefault.xctoolchain / usr / include   -Xcc -I / Users / abcxyz / Library / Developer / Xcode / DerivedData / MyAp-ehmiuzpyuhwbkpfvduswfbhkdjut / Build / Intermediates / MyAp.build / Debug-iphoneos / MyAp.build / DerivedSources / armv7   -Xcc -I / Users / abcxyz / Library / Developer / Xcode / DerivedData / MyAp-ehmiuzpyuhwbkpfvduswfbhkdjut / Build / Intermediates / MyAp.build / Debug-iphoneos / MyAp.build / DerivedSources   -Xcc -DDEBUG = 1 -Xcc -working-directory / Users / abcxyz / Documents / iOS / MyAp -emit-module-doc-path / Users / abcxyz / Library / Developer / Xcode / DerivedData / MyAp-ehmiuzpyuhwbkpfvduswfbhkdjut / Build / Intermediates /MyAp.build/Debug-iphoneos/MyAp.build/Objects-normal/armv7/CoreDataBox~partial.swiftdoc -Onone -module-name Me -emit-module-path / Users / abcxyz / Library / Developer / Xcode / DerivedData / MYAP-ehmiuzpyuhwbkpfvduswfbhkdjut /建造/中间体/ MyAp.build /调试-的iPhoneOS / MyAp.build /对象 - 正常/ ARMv7的/ CoreDataBox〜partial.swiftmodule   -serialize-diagnostics-path /Users/abcxyz/Library/Developer/Xcode/DerivedData/MyAp-ehmiuzpyuhwbkpfvduswfbhkdjut/Build/Intermediates/MyAp.build/Debug-iphoneos/MyAp.build/Objects-normal/armv7/CoreDataBox.dia   -emit-dependencies-path /Users/abcxyz/Library/Developer/Xcode/DerivedData/MyAp-ehmiuzpyuhwbkpfvduswfbhkdjut/Build/Intermediates/MyAp.build/Debug-iphoneos/MyAp.build/Objects-normal/armv7/CoreDataBox.d   -emit-reference-dependencies-path /Users/abcxyz/Library/Developer/Xcode/DerivedData/MyAp-ehmiuzpyuhwbkpfvduswfbhkdjut/Build/Intermediates/MyAp.build/Debug-iphoneos/MyAp.build/Objects-normal/armv7/CoreDataBox.swiftdeps   -o /Users/abcxyz/Library/Developer/Xcode/DerivedData/MyAp-ehmiuzpyuhwbkpfvduswfbhkdjut/Build/Intermediates/MyAp.build/Debug-iphoneos/MyAp.build/Objects-normal/armv7/CoreDataBox.o

     
      
  1. 发射IR SIL功能时@TToFC2Me11CoreDataBox12insertObjectfS0_U__FTSS4dicoCSo12NSDictionary_T_   for＆＃39; insertObject＆＃39;在   /Users/abcxyz/Documents/iOS/LibBin/Swift_CoreDataBox/CoreDataBox.swift:98:5
    2.   

1 个答案:

答案 0 :(得分：1)

您只是使用KVC来设置属性，因此您不需要特定的NSManagedObject子类。

用一个转换为NSManagedObject取代应该有效。使它成为通用的（在Swift意义上）将是过度的 - 毕竟，你需要NSManagedObject。所以你是“推广”而不是使用“泛型”。

相关问题
最新问题