在Swift中的应用和今日扩展之间共享核心数据数据库

Question

I have a database from which my widget has to read some data. I've set the membership targets to all the related files to both the app and the widget. There is a problem though.

I have a helper class in my main app that gets the AppDelegate context whenever i do some operations on the database. The code looks as follows:

class func getEntityAndContext(name:String) -> (entity:NSEntityDescription, context: NSManagedObjectContext){
    var appDel:AppDelegate = UIApplication.sharedApplication().delegate as AppDelegate
    let context:NSManagedObjectContext = appDel.managedObjectContext!
    let entity:NSEntityDescription = NSEntityDescription.entityForName(name, inManagedObjectContext: context)!
    return (entity, context)
}

This method helps me in cases like these:

class func getAll() -> Array<City>{
        let (_, context) = NSManagedObjectWrapper.getEntityAndContext("City")
        let req = NSFetchRequest(entityName: "City")
        req.sortDescriptors = [NSSortDescriptor(key: "order", ascending: true)]
        let citiesList:Array<City> = context.executeFetchRequest(req, error: nil)! as Array<City>
        return citiesList
    }

After i added the target membership to the widget, i get this error: Use of undeclared type 'AppDelegate' . It makes sense, but i have no idea how to fix it. Can you please help me?

PS: I also noticed that i get this error too: Use of unresolved identifier 'NSFetchRequest' . What am i doing wrong? This surely can't be the way to do it...

Answer 1

I found an answer here: https://github.com/pjchavarria/Swift-Widget

This git project shows how to use core data in a widget.