使用Swift 2 Advanced iOS进行iOS开发

return 1 //This will return only one row.

internal func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
   return 1;
}
internal func tableView(_ tableView: UITableView,
   cellForRowAt indexPath: IndexPath) -> UITableViewCell {
   let cell = UITableViewCell(style:
   UITableViewCellStyle.default, reuseIdentifier: "Cell")
   cell.textLabel?.text = "First Row"
   return cell
}

internal func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
   return 10;
}
internal func tableView(_ tableView: UITableView,
   cellForRowAt indexPath: IndexPath) -> UITableViewCell {
   let cell = UITableViewCell(style: UITableViewCellStyle.default, reuseIdentifier: "Cell")
}

tableView.reloadData()

@IBAction func startTimerButton(_ sender: Any) {
   if !timerActive {
      timerActive = true
      eggTimer = Timer.scheduledTimer(timeInterval: 1, target: self, selector:
      #selector(ViewController.processTimer), userInfo: nil, repeats: true)
   }
}

func stopTimer() {
   timerActive = false
   eggTimer.invalidate()
}

@IBAction func pauseTimerButton(_ sender: Any) {
   stopTimer()
}

@IBAction func subtractTime(_ sender: Any) {
   if timeLeft > 10 {
      timeLeft = timeLeft - 10
      timeLeftLabel.text = String(timeLeft)
   }
}

@IBAction func resetTimer(_ sender: Any) {
   timeLeft = 210
   timeLeftLabel.text = String(timeLeft)
}

@IBAction func addTime(_ sender: Any) {
   timeLeft = timeLeft + 10
   timeLeftLabel.text = String(timeLeft)
}

import UIKit
class ViewController: UIViewController {
   @IBOutlet weak var timeLeftLabel: UILabel!
   var eggTimer = Timer()  // Initialize the Timer class.
   var timerActive = false // Prevents multiple timers from firing.
   var timeLeft = 210  
   func stopTimer() {
      timerActive = false
      eggTimer.invalidate()
   }

   func processTimer() {
      if timeLeft <= 0 {
         stopTimer()
         return
      }     
      timeLeft = timeLeft - 1;
      timeLeftLabel.text = String(timeLeft)
   }

   @IBAction func startTimerButton(_ sender: Any) {
      if !timerActive {
         timerActive = true
         eggTimer = Timer.scheduledTimer(timeInterval: 1, target: self, selector:
         #selector(ViewController.processTimer), userInfo: nil, repeats: true)
      }
   }

   @IBAction func pauseTimerButton(_ sender: Any) {
      stopTimer()
   }

   @IBAction func subtractTime(_ sender: Any) {
      if timeLeft > 10 {
         timeLeft = timeLeft - 10
         timeLeftLabel.text = String(timeLeft)
      }
   }

   @IBAction func resetTimer(_ sender: Any) {
      timeLeft = 210
      timeLeftLabel.text = String(timeLeft)
   }

   @IBAction func addTime(_ sender: Any) {
      timeLeft = timeLeft + 10
      timeLeftLabel.text = String(timeLeft)
   }

   override func viewDidLoad() {
      super.viewDidLoad()
      // Do any additional setup after loading the view, typically from a nib.
   }  
   override func didReceiveMemoryWarning() {
      super.didReceiveMemoryWarning()
      // Dispose of any resources that can be recreated
   }
}

let defaultValues = NSUserDefaults.standardUserDefaults()

defaultValues.setObject("Simplified iOS", forKey: "nameKey")  
func setDouble(value: Double, forKey defaultName: String)
func setBool(value: Bool, forKey defaultName: String)
func setObject(value: AnyObject?, forKey defaultName: String)
func setURL(url: NSURL?, forKey defaultName: String)
func setInteger(value: Int, forKey defaultName: String)
func setFloat(value: Float, forKey defaultName: String)

func boolForKey(defaultName: String) -> Bool
func integerForKey(defaultName: String) -> Int
func floatForKey(defaultName: String) -> Float
func doubleForKey(defaultName: String) -> Double
func objectForKey(defaultName: String) -> AnyObject?
func URLForKey(defaultName: String) -> NSURL?

let appDelegate = UIApplication.shared.delegate as! AppDelegate

let context = appDelegate.persistentContainer.viewContext

let newValue = NSEntityDescription.insertNewObject(forEntityName: "Users", into: context)

newValue.setValue(textField.text, forKey: "name")

context.save();

let request = NSFetchRequest<NSFetchRequestResult>(entityName: "Users")

let results = try context.fetch(request)

var isLoggedIn = false
@IBAction func logIn(_ sender: AnyObject) {
   let appDelegate = UIApplication.shared.delegate as! AppDelegate
   let context = appDelegate.persistentContainer.viewContext
   if isLoggedIn {
      let request = NSFetchRequest<NSFetchRequestResult>(entityName: "Users")
      do {
         let results = try context.fetch(request)
         if results.count > 0 {
            for result in results as! [NSManagedObject] {
               result.setValue(textField.text, forKey: "name")
               do {
                  try context.save()
               }
               catch {
                  print("Update username failed")
               }
            }
            label.text = "Hi " + textField.text! + "!"
         }
      }
      catch {
         print("Update failed")
      }
   } else {
      let newValue = NSEntityDescription.insertNewObject(forEntityName: "Users", into: context)
      newValue.setValue(textField.text, forKey: "name")
      do {
         try context.save()
         logInButton.setTitle("Update username", for: [])
         label.alpha = 1
         label.text = "Hi " + textField.text! + "!"
         isLoggedIn = true
         logOutButton.alpha = 1
      }  
      catch {
         print("Failed to save")
      }     
   }
}

@IBAction func logOut(_ sender: AnyObject) {
   let appDelegate = UIApplication.shared.delegate as! AppDelegate
   let context = appDelegate.persistentContainer.viewContext
   let request = NSFetchRequest<NSFetchRequestResult>(entityName: "Users")
   do {
      let results = try context.fetch(request)
      if results.count > 0 {
         for result in results as! [NSManagedObject] {
            context.delete(result)
            do {
               try context.save()
            } catch {
               print("Individual delete failed")
            }
         }
         label.alpha = 0
         logOutButton.alpha = 0
         logInButton.setTitle("Login", for: [])
         isLoggedIn = false
         textField.alpha = 1
      }
   } catch {
      print("Delete failed")
   }
}

override func viewDidLoad() {
   super.viewDidLoad()
   // Do any additional setup after loading the view, typically from a nib.
   let appDelegate = UIApplication.shared.delegate as! AppDelegate
   let context = appDelegate.persistentContainer.viewContext
   let request = NSFetchRequest<NSFetchRequestResult>(entityName: "Users")
   request.returnsObjectsAsFaults = false
   do {
      let results = try context.fetch(request)
      for result in results as! [NSManagedObject] {
         if let username = result.value(forKey: "name") as? String {
            logInButton.setTitle("Update username", for: [])
            logOutButton.alpha = 1
            label.alpha = 1
            label.text = "Hi there " + username + "!"
         }     
      }

   } catch {
      print("Request failed")
   }
}

override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?) {
   self.view.endEditing(true)  
}

func textFieldShouldReturn(_ textField: UITextField) -> Bool {
   textField.resignFirstResponder()  
   return true
}

import UIKit
class ViewController: UIViewController, UITextFieldDelegate {
   override func viewDidLoad() {
      super.viewDidLoad()
      // Do any additional setup after loading the view, typically from a nib.
   }  
   override func didReceiveMemoryWarning() {
      super.didReceiveMemoryWarning()
      // Dispose of any resources that can be recreated.
   }
   override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?) {
      self.view.endEditing(true)
   }
   func textFieldShouldReturn(_ textField: UITextField) -> Bool {
      textField.resignFirstResponder()
      return true
   }
}