核心数据：持久存储在Xcode中但不在设备上 [英] Core Data: Persistent Store Works in Xcode but not on Device

问题描述

我在我的iPhone应用程式中使用Core Data。它工作正常，当我在模拟器中使用它，但当我部署到设备，我的Core Data存储的值没有找到我的应用程序。如果我在iPhone上插入一个值，它会在Core Data中找到值。

我需要在部署到iPhone时保留Core Data的值。

请帮助我

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准备您的CoreData数据库文件

将其命名为InitialData.sqlite

将其添加到应用程序包

...并且在NSPersistentStoreCreation分配&

  NSString * storePath = ...永久存储协调器的存储路径...; 
 
 NSFileManager * fileManager = [NSFileManager defaultManager]; 
 if（！[fileManager fileExistsAtPath：storePath]）{
 NSString * initialStorePath = [[NSBundle mainBundle] pathForResource：@InitialDataofType：@sqlite]; 
 if（defaultStorePath）{
 [fileManager copyItemAtPath：initialStorePath toPath：storePath error：NULL]; 
} 
} 
  

我假设您要将一些默认数据复制到应用。这是我可以从你的问题中推断出来 - 这是不清楚你真正想要什么。

I am using Core Data in my iPhone apps. It works fine when I use it in the simulator but when I deploy it to device, the value of my Core Data store is not found to my application. If I insert a value on the iPhone it finds the value in Core Data.

I need to keep the value of Core Data while deploying it to iPhone.

Please help me if anyone knows how to do this.

解决方案

It's quite easy ...

• prepare your CoreData database file
• name it, InitialData.sqlite for example
• add it to your application bundle

... and add something like to this just before NSPersistentStoreCreation allocation & initialization.

NSString *storePath = ... your store path for persistent store coordinator ...;

NSFileManager *fileManager = [NSFileManager defaultManager];
if (![fileManager fileExistsAtPath:storePath]) {
  NSString *initialStorePath = [[NSBundle mainBundle] pathForResource:@"InitialData" ofType:@"sqlite"];
  if (defaultStorePath) {
    [fileManager copyItemAtPath:initialStorePath toPath:storePath error:NULL];
  }
}

I assume you want to copy some default data to your application. That's all I can deduce from your question - it's quite unclear what you really want.

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