xcode UIApplication 没有成员共享
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UIApplication has no member shared
提问by bircastri
Im'm building an app to iOS system with Swift language. So I have add to my project, the core data.
我正在用 Swift 语言为 iOS 系统构建一个应用程序。所以我在我的项目中添加了核心数据。
I have also created 'CoreDataController'
我还创建了“CoreDataController”
this is the code of it:
这是它的代码：
import Foundation
import CoreData
import UIKit
class CoreDataController {
static let shared = CoreDataController()
private var context: NSManagedObjectContext
private init() {
let application = UIApplication.shared.delegate as! AppDelegate
self.context = application.persistentContainer.viewContext
}
}
At line UIApplication.shared.delegate ..... I have an error
在行 UIApplication.shared.delegate ..... 我有一个错误
Type 'UIApplication' has no member shared
“UIApplication”类型没有共享成员
This is my appdelegade file
这是我的 appdelegade 文件
import UIKit
import CoreData
@UIApplicationMain
class AppDelegate: UIResponder, UIApplicationDelegate {
var window: UIWindow?
func application(application: UIApplication, didFinishLaunchingWithOptions launchOptions: [NSObject: AnyObject]?) -> Bool {
// Override point for customization after application launch.
return true
}
func applicationWillResignActive(application: UIApplication) {
// Sent when the application is about to move from active to inactive state. This can occur for certain types of temporary interruptions (such as an incoming phone call or SMS message) or when the user quits the application and it begins the transition to the background state.
// Use this method to pause ongoing tasks, disable timers, and throttle down OpenGL ES frame rates. Games should use this method to pause the game.
}
func applicationDidEnterBackground(application: UIApplication) {
// Use this method to release shared resources, save user data, invalidate timers, and store enough application state information to restore your application to its current state in case it is terminated later.
// If your application supports background execution, this method is called instead of applicationWillTerminate: when the user quits.
}
func applicationWillEnterForeground(application: UIApplication) {
// Called as part of the transition from the background to the inactive state; here you can undo many of the changes made on entering the background.
}
func applicationDidBecomeActive(application: UIApplication) {
// Restart any tasks that were paused (or not yet started) while the application was inactive. If the application was previously in the background, optionally refresh the user interface.
}
func applicationWillTerminate(application: UIApplication) {
// Called when the application is about to terminate. Save data if appropriate. See also applicationDidEnterBackground:.
self.saveContext()
}
lazy var persistentContainer: NSPersistentContainer = {
/*
The persistent container for the application. This implementation
creates and returns a container, having loaded the store for the
application to it. This property is optional since there are legitimate
error conditions that could cause the creation of the store to fail.
*/
let container = NSPersistentContainer(name: "ArduinoHomeKit")
container.loadPersistentStores(completionHandler: { (storeDescription, error) in
if let error = error as NSError? {
// Replace this implementation with code to handle the error appropriately.
// fatalError() causes the application to generate a crash log and terminate. You should not use this function in a shipping application, although it may be useful during development.
/*
Typical reasons for an error here include:
* The parent directory does not exist, cannot be created, or disallows writing.
* The persistent store is not accessible, due to permissions or data protection when the device is locked.
* The device is out of space.
* The store could not be migrated to the current model version.
Check the error message to determine what the actual problem was.
*/
fatalError("Unresolved error \(error), \(error.userInfo)")
}
})
return container
}()
}
I have jump this information of AppDelegate file?
我有跳转 AppDelegate 文件的这些信息吗？
回答by mohsen
use for Xcode 7.3.1 by swift 2.2
Swift 2.2 用于 Xcode 7.3.1
let appvar = UIApplication.sharedApplication().delegate as! AppDelegate
and for swift 3.x, 4.x, 5 (xcode 8.0 and newer)
以及 swift 3.x、4.x、5（xcode 8.0 和更新版本）
let appvar = UIApplication.shared.delegate as! AppDelegate
