Ios 持久存储可以'；在大量迁移中找不到迁移策略类

我得到了这个错误：

2015-12-29 03:13:41.603 n-back project[21345:474175] CoreData: error: -addPersistentStoreWithType:SQLite configuration:(null) URL:file:///Users/Nathan/Library/Developer/CoreSimulator/Devices/EC2C60E2-9FC8-40D7-B16F-15960AA6B42A/data/Containers/Data/Application/8F8132B0-76E9-491E-BA1B-27A5D78CE7D0/Documents/data.sqlite options:{
    NSMigratePersistentStoresAutomaticallyOption = 1;
} ... returned error Error Domain=NSCocoaErrorDomain Code=134110 "(null)" UserInfo={NSUnderlyingException=Couldn't create mapping policy for class named (BTRPolicy)} with userInfo dictionary {
    NSUnderlyingException = "Couldn't create mapping policy for class named (BTRPolicy)";
}
2015-12-29 03:13:41.608 n-back project[21345:474175] Unresolved error Error Domain=YOUR_ERROR_DOMAIN Code=9999 "Failed to initialize the application's saved data" UserInfo={NSLocalizedDescription=Failed to initialize the application's saved data, NSUnderlyingError=0x7b14eef0 {Error Domain=NSCocoaErrorDomain Code=134110 "(null)" UserInfo={NSUnderlyingException=Couldn't create mapping policy for class named (BTRPolicy)}}, NSLocalizedFailureReason=There was an error creating or loading the application's saved data.}, [NSLocalizedDescription: Failed to initialize the application's saved data, NSUnderlyingError: Error Domain=NSCocoaErrorDomain Code=134110 "(null)" UserInfo={NSUnderlyingException=Couldn't create mapping policy for class named (BTRPolicy)}, NSLocalizedFailureReason: There was an error creating or loading the application's saved data.]

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在我看来，它在查找类B策略时遇到了问题。它存在于名为BTRPolicy的文件BTRPolicy中。它被正确地子类化，并在实用程序窗格上的自定义策略选择中被引用为“BTRPolicy”。有什么想法吗？

如果其他人有这个问题，并且这个问题与您的谷歌搜索匹配：我解决了，出于某种原因，自定义策略现在需要以模块名称作为前缀。

如果其他人有这个问题，并且这个问题与您的谷歌搜索匹配：我解决了，出于某些原因，现在需要在自定义保单前面加上模块名称。

是仅用于Swift还是也用于Objective-C？仅用于Swift。是仅用于Swift还是也用于Objective-C？仅用于Swift。