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2014/10/15 ¤U¤È 10:16:03
iphone Programming Glossary: xcdatamodelWhat do I have to do to get Core Data to automatically migrate models? http://stackoverflow.com/questions/1018155/what-do-i-have-to-do-to-get-core-data-to-automatically-migrate-models error NSLog @ Problem with PersistentStoreCoordinator @ error Then you need to do a little trick in xCode Select your xcdatamodel file Select the Design Menu at the top then Data Model then choose Add Model Version Your xcdatamodel file will then get.. Select your xcdatamodel file Select the Design Menu at the top then Data Model then choose Add Model Version Your xcdatamodel file will then get moved into a new directory with the same name as your xcdatamodel file but with the extension xcdatamodeld.. choose Add Model Version Your xcdatamodel file will then get moved into a new directory with the same name as your xcdatamodel file but with the extension xcdatamodeld there will be a second file in this directory with a 2 in the name. Select the..
core data in a static library for the iPhone http://stackoverflow.com/questions/1711586/core-data-in-a-static-library-for-the-iphone use of the Core Data framework. I can successfully use the library in my external project but ONLY if I include the .xcdatamodel file in the main project. That is less than ideal since the point of the library was to hide implementation details to the.. copies some images and things like that into the bundle and a Compile Sources build phase where I am compiling the xcdatamodel. The final bundle will contain all the necessary files. In your main project that relies on the static library you have..
insertNewObjectForEntityForName: http://stackoverflow.com/questions/1780929/insertnewobjectforentityforname I set up an Entity using the Xcode .xcdatamodel file editor. I created an entity called Person added a few attributes then generated a .m file to represent it. That all.. template what you get if you make a new application that uses Core Data . If you have all that make sure that your xcdatamodel is listed in your Compile Sources step of the build. And of course make sure that Person is actually the Entity name in..
Implementation of “Automatic Lightweight Migration” for Core Data (iPhone) http://stackoverflow.com/questions/2310216/implementation-of-automatic-lightweight-migration-for-core-data-iphone error Handle error return persistentStoreCoordinator 2. Version your Data Model and Edit the new file. Select your xcdatamodel file Design Data Model Add Model Version expand your xcdatamodeld item Select the or later file Design Data Model Set Current.. your Data Model and Edit the new file. Select your xcdatamodel file Design Data Model Add Model Version expand your xcdatamodeld item Select the or later file Design Data Model Set Current Version edit this version 3. Specify the momd resource in app..
How does the iPhone SDK Core Data system store date types to sqlite? http://stackoverflow.com/questions/2494542/how-does-the-iphone-sdk-core-data-system-store-date-types-to-sqlite NSDate date m insertObject f NSError error m save error Where the created_at field is defined as type Date in the xcdatamodel. When I export the sql from the sqlite database it created created_at is defined as type timestamp and the values look like..
http://stackoverflow.com/questions/4177398/save-and-load-data-coredata load when changing the date This code does this use the entity and property names How exactly do I need to setup my xcdatamodel file Do I need to use this code or does this just demonstrate what entities and properties I need DatedText savedText String..
http://stackoverflow.com/questions/901640/core-data-primary-key Data Primary Key This may seem stupid but I still couldn't figure out how to mark a attribute as a primary key in the xcdatamodel file. My persistent storage is sqlite file. Can anyone help me In that case how can I validate a ID to be unique Should..
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