Ios Xcode 6从UIViewController访问UIApplication

我有一个使用CoreData存储用户信息的简单应用程序。我对Xcode非常陌生，所以请原谅我的无知，但我似乎没有包括正确的模块，因为Xcode没有自动完成UIApplication、NSManagedObjectContext和NSEntityDescription等类及其函数

此外，我得到一些错误显示在屏幕截图

我是否需要导入另一个模块以便识别它们

import UIKit
import CoreData

class OutlineViewController: UIViewController {

    @IBOutlet weak var textFieldTitle: UITextField = nil
    @IBOutlet weak var textFieldTag: UITextField = nil

    override func viewDidLoad() {
        super.viewDidLoad()
    }

    @IBAction func saveTapped(sender: AnyObject) {
        let appDel: AppDelegate = UIApplication.sharedApplication().delegate as AppDelegate

        let context: NSManagedObjectContext = appDel.managedObjectContext
        let en: NSEntityDescription.entityForName("Outline", inManagedObjectContext: context)
        // I get the error on the above line that "Consecutive statements on a line must be separated by ';'" and it suggests that I place a semicolon after entityForName

        var newItem = Model(entity: en, insertIntoManagedObjectContext: context)

        newItem.title = textFieldTitle.text
        newItem.Tag = textFieldTag.text

        context.save(nil)

        println(newItem)

        self.navigationController.popToRootViewControllerAnimated(true)
    }

    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
    }    
}

---

从我在中所读到的，NSEntityDescription是CoreData的一部分。为什么它没有被识别？

您在需要类型声明的地方给出了语句。你忘了作业：

import UIKit
import CoreData

class OutlineViewController: UIViewController {

    @IBOutlet weak var textFieldTitle: UITextField = nil
    @IBOutlet weak var textFieldTag: UITextField = nil

    override func viewDidLoad() {
        super.viewDidLoad()
    }

    @IBAction func saveTapped(sender: AnyObject) {
        let appDel: AppDelegate = UIApplication.sharedApplication().delegate as AppDelegate

        let context: NSManagedObjectContext = appDel.managedObjectContext
        let en: NSEntityDescription.entityForName("Outline", inManagedObjectContext: context)
        // I get the error on the above line that "Consecutive statements on a line must be separated by ';'" and it suggests that I place a semicolon after entityForName

        var newItem = Model(entity: en, insertIntoManagedObjectContext: context)

        newItem.title = textFieldTitle.text
        newItem.Tag = textFieldTag.text

        context.save(nil)

        println(newItem)

        self.navigationController.popToRootViewControllerAnimated(true)
    }

    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
    }    
}

let en: NSEntityDescription? = NSEntityDescription.entityForName("Outline", inManagedObjectContext: context)

要解决所有其他问题，请签出：

class OutlineViewController: UIViewController {

    @IBOutlet weak var textFieldTitle: UITextField? = nil
    @IBOutlet weak var textFieldTag: UITextField? = nil

    override func viewDidLoad() {
        super.viewDidLoad()
    }

    @IBAction func saveTapped(sender: AnyObject) {
        let appDel: AppDelegate = UIApplication.sharedApplication().delegate as AppDelegate

        let context: NSManagedObjectContext = appDel.managedObjectContext
        let en: NSEntityDescription = NSEntityDescription.entityForName("Outline", inManagedObjectContext: context)!
        // I get the error on the above line that "Consecutive statements on a line must be separated by ';'" and it suggests that I place a semicolon after entityForName

        var newItem = Model(entity: en, insertIntoManagedObjectContext: context)

        newItem.title = textFieldTitle.text
        newItem.Tag = textFieldTag.text

        context.save(nil)

        println(newItem)

        self.navigationController?.popToRootViewControllerAnimated(true)
    }

    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
    }    
}

---

感谢您的评论，但这似乎引发了一些其他有趣的错误，似乎您没有展开或可选链接可选变量。查看更新的答案。