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I have set up one of my core data attributes as a Boolean. Now, I need to set it, but XCode keeps telling me that it may not respond to setUseGPS.
[ride setUseGPS: useGPS.on]; What is the method for setting a boolean in core data? All my other attributes are set this way, and they work great. So, not sure why a boolean does not work to be set this way?
759
To save an object with Core Data, you can simply create a new instance of the NSManagedObject subclass and save the managed context. In the code above, we've created a new Person instance and saved it locally using Core Data.
Core Data is a framework that you use to manage the model layer objects in your application. It provides generalized and automated solutions to common tasks associated with object life cycle and object graph management, including persistence.
The next time you need to store data, you should have a better idea of your options. Core Data is unnecessary for random pieces of unrelated data, but it's a perfect fit for a large, relational data set. The defaults system is ideal for small, random pieces of unrelated data, such as settings or the user's preferences.
Core Data "does not have" a Boolean type (it does, but it is an NSNumber).
So to set the equivalent of useGPS = YES.
[entity setUseGPS:[NSNumber numberWithBool:YES]]; And the other way around:
BOOL isGPSOn = [[entity useGPS] boolValue]; Update: As pointed out by SKG, With literals in Objetive-C you can now do it in a simpler way:
[entity setUseGPS:@YES]; BOOL isGPSOn = entity.useGPS.boolValue; If you love us? You can donate to us via Paypal or buy me a coffee so we can maintain and grow! Thank you!
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