Swift学习笔记七

Project 19 Capital Cities

1. 将 view controller 设置为 map view的代理：Ctrl-dragging from the map view to the orange and white view controller button just above the layout area

2. 使用地图的 Annotation

   import MapKit
   import UIKit
   
   class Capital: NSObject, MKAnnotation {
       var title: String?
       var coordinate: CLLocationCoordinate2D
       var info: String
       
       init(title: String, coordinate: CLLocationCoordinate2D, info: String) {
           self.title = title
           self.coordinate = coordinate
           self.info = info
       }
   }
   mapView.addAnnotations([london, oslo, paris, rome, washington])

3. 复用AnnotationView

   func mapView(mapView: MKMapView!, viewForAnnotation annotation: MKAnnotation!) -> MKAnnotationView! {
           let identifier = "Capital"
           if annotation.isKindOfClass(Capital.self) {
               var annotationView = mapView.dequeueReusableAnnotationViewWithIdentifier(identifier)
               if annotationView == nil {
                   annotationView = MKPinAnnotationView(annotation: annotation, reuseIdentifier: identifier)
                   annotationView!.canShowCallout = true
                   let btn = UIButton(type: .DetailDisclosure)
                   annotationView!.rightCalloutAccessoryView = btn
               } else {
                   annotationView!.annotation = annotation
               }
               return annotationView
           }
           return nil
       }

4. func mapView(mapView: MKMapView!, annotationView view: MKAnnotationView!, calloutAccessoryControlTapped control: UIControl!) {
           let captial = view.annotation as! Capital
           let placeName = captial.title
           let placeInfo = captial.info
           
        }

Project 21 Local Notifications

1. 注册Notifications

   @IBAction func registerLocal(sender: AnyObject) {
           let notificationSettings = UIUserNotificationSettings(forTypes: [.Alert, .Badge, .Sound], categories: nil)
           UIApplication.sharedApplication().registerUserNotificationSettings(notificationSettings)
       }

2. 定时执行Notification

   @IBAction func scheduleLocal(sender: AnyObject) {
           
           guard let settings = UIApplication.sharedApplication().currentUserNotificationSettings() else { return }
           if settings.types == .None {
               let ac = UIAlertController(title: "Can't schedule", message: "permission", preferredStyle: .Alert)
               ac.addAction(UIAlertAction(title: "OK", style: .Default, handler: nil))
               presentViewController(ac, animated: true, completion: nil)
               return
           }
           
           let notification = UILocalNotification()
           notification.fireDate = NSDate(timeIntervalSinceNow: 5)
           notification.alertBody = "Hey man, swipe to unlock!"
           notification.alertAction = "WeChat"
           notification.soundName = UILocalNotificationDefaultSoundName
           notification.userInfo = ["CustomField1": "w00t"]
           UIApplication.sharedApplication().scheduleLocalNotification(notification)
       }

3. didFinishLaunchingWithOptions

   func application(application: UIApplication, didFinishLaunchingWithOptions launchOptions: [NSObject: AnyObject]?) -> Bool {
           if let options = launchOptions {
               if let notification = options[UIApplicationLaunchOptionsLocalNotificationKey] as? UILocalNotification {
                   if let userInfo = notification.userInfo {
                       let customField1 = userInfo["CustomField1"] as! String
                       print("didFinishLaunchingWithOptions: \(customField1)")
                   }
               }
           }
           return true
       }

4. didFinishLaunchingWithOptions

   func application(application: UIApplication, didReceiveLocalNotification notification: UILocalNotification) {
       if let userInfo = notification.userInfo {
           let customField1 = userInfo["CustomField1"] as! String
           print("didReceiveLocalNotification: \(customField1)")
       }
   }

Project 24 Swift Extensions

1. static means: do you want to call this method on the type itself, or do you want to call this on an instance of the type?

   extension Int {
       mutating func plusOne() {
           ++self
       }
       static func random(min min: Int, max: Int) -> Int {
          return 0
       }
   }

2. a method belongs to a particular class, struct or enum. Functions, however, are global beasts: they don’t belong to a particular class, so they can be called anywhere.

3. 如果经常要用到去除字符串的空格，可以使用extension
   命名为String+Additions.swift

   extension String {
       mutating func trim() {
           self = stringByTrimmingCharactersInSet(NSCharacterSet.whitespaceAndNewlineCharacterSet())
       }
   }

11-18

iBYR 北邮人论坛iOS客户端Swift实现

设计界面，包括十大、分区、收藏、用户4个Tab Bar，申请开放平台的app key.

11-19

继续丰富界面，添加一些tab view cell的跳转

11-21

遵守UIWebViewDelegate协议，但忘记写webView.delegate = self

11-22 Getting Started with Core Data Tutorial

1. Ctrl-drag from the table view to the yellow view controller icon, click on dataSource

2. 注册TableViewCell

   override func viewDidLoad() {
        super.viewDidLoad()
        title = "\"The List\""
        tableView.registerClass(UITableViewCell.self, forCellReuseIdentifier: "Cell")
    }

3. // MARK: 加标记

   func tableView(~~~~~~~~~~~~~~~~~~~~~~  numberOfRowsInSection ~~~~~~~~~~~~~~~~~~~~~~)    
   func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
           let cell = tableView.dequeueReusableCellWithIdentifier("Cell")
           let person = people[indexPath.row]
           cell!.textLabel!.text = person.valueForKey("name") as? String
           return cell!
       }

4. 显示TextField 的输入框

   alert.addTextFieldWithConfigurationHandler { (textField: UITextField) -> Void in
   
   }

5. 添加数据，重载tableView的数据

   let textField = alert.textFields!.first
   self.names.append(textField!.text!)
   self.tableView.reloadData()

6. 存数据

   func saveName(name: String) {
           let appDelegate = UIApplication.sharedApplication().delegate as! AppDelegate
           let managedContext = appDelegate.managedObjectContext
           
           let entity = NSEntityDescription.entityForName("Person", inManagedObjectContext: managedContext)
           let person = NSManagedObject(entity: entity!, insertIntoManagedObjectContext: managedContext)
           
           person.setValue(name, forKey: "name")
           
           do {
               try managedContext.save()
               people.append(person)
           } catch let error as NSError {
               print("Could not save \(error), \(error.userInfo)")
           }
       }

7. 取数据

   override func viewWillAppear(animated: Bool) {
         let appDelegate = UIApplication.sharedApplication().delegate as! AppDelegate
         let managedObjectContext = appDelegate.managedObjectContext
         
         let fetchRequest = NSFetchRequest(entityName: "Person")
         
         do {
             let results = try managedObjectContext.executeFetchRequest(fetchRequest)
             people = results as! [NSManagedObject]
         } catch let error as NSError {
             print("Could not fetch \(error), \(error.userInfo)")
         }
     }

8. tableView 返回true表示可以编辑

   func tableView(tableView: UITableView, canEditRowAtIndexPath indexPath: NSIndexPath) -> Bool {
         return true
   }