Created
December 21, 2016 03:11
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Core Data ManagedObjectContextSettable 协议
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| protocol ManagedObjectContextSettable: class { | |
| var managedObjectContext: NSManagedObjectContext! { get set } | |
| } |
最后，我们可以在应用程序代理给实现了这个协议的 root view controller 设置上下文对象：
func application(application: UIApplication, didFinishLaunchingWithOptions launchOptions: [NSObject: AnyObject]?) -> Bool { // ... guard let vc = window?.rootViewController as? ManagedObjectContextSettable else { fatalError("Wrong view controller type") } vc.managedObjectContext = managedObjectContext // ... }
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现在我们让视图层次里的第一个 view controller 实现这个协议：
class RootViewController: UIViewController, ManagedObjectContextSettable { var managedObjectContext: NSManagedObjectContext! // ... }