swift - AppDelegate 类型的值在 swift 4 中没有成员 managedObjectContext

Question

我有代码:

let appDel:AppDelegate = UIApplication.shared.delegate as! AppDelegate
let context:NSManagedObjectContext = appDel.persistentContainer.viewContext

但是xcode报错:

Value of type AppDelegate has no member managedObjectContext.

我想找到一个解决方案，非常感谢。

Answer 1

请使用下面的代码

import CoreData frame work
func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool {
    // Override point for customization after application launch.

    let appDel:AppDelegate = UIApplication.shared.delegate as! AppDelegate
    let context:NSManagedObjectContext = appDel.persistentContainer.viewContext

    return true
}