fetch find Core Data

    let appDel = UIApplication.sharedApplication().delegate as AppDelegate
    let fetchRequest = NSFetchRequest(entityName: "Puzzle")
    let predicate = NSPredicate(format: "title == %@", "Best Language")
    fetchRequest.predicate = predicate
    let managedContext = appDel.managedObjectContext
    var error:NSError?
    // Execute the fetch request, and cast the results to an array of LogItem objects
    if let fetchResults = managedContext?.executeFetchRequest(fetchRequest, error: &error){
      if error != nil {
        println("error fetch request \(__FUNCTION__)")
       
      }else {
       
        println("num results \(fetchResults.count)")
       
       
      }

Tags: 
swift

time for timer calc

    let minutes:Int = Int( Float(elapsedTime) / 60.0 )
    let hours:Int = Int( Float(elapsedTime) / 3600.0 )
    let sec:Int = Int( fmodf(Float(elapsedTime), 60.0))

    var minuteStr = "\(minutes)"
    if minutes < 10 {
      minuteStr = "0\(minutes)"
    }
    var hourStr = "\(hours)"
    if hours < 10 {
      hourStr = "0\(hours)"
    }
    var secStr = "\(sec)"
    if sec < 10 {
      secStr = "0\(sec)"
    }
   
    timeLabel.text = "\(hourStr):\(minuteStr):\(secStr)"

Tags: 
swift

Draw Line

UIColor.brownColor().set()
  let context = UIGraphicsGetCurrentContext()
  CGContextSetLineWidth(context, 5)
  CGContextMoveToPoint(context, 50, 10)
  CGContextAddLineToPoint(context, 100, 123)
  CGContextStrokePath(context)

Tags: 
swift

GCD

After amount of time

func delay(delay:Double, closure:()->()) {
    dispatch_after(
        dispatch_time(
            DISPATCH_TIME_NOW,
            Int64(delay * Double(NSEC_PER_SEC))
        ),
        dispatch_get_main_queue(), closure)
}

so use it as:
delay(0.4) {
    // do stuff
}

swift 3

func delay(delay:Double, closure:()->Void) {
  DispatchQueue.main.after(when: DispatchTime.now()+delay, execute: closure)
}

Tags: 
swift

nsnotificaton

Sent(Post) Notification

NSNotificationCenter.defaultCenter().postNotificationName("NotificationIdentifier", object: nil)

Receive(Get) Notification

NSNotificationCenter.defaultCenter().addObserver(self, selector: "methodOfReceivedNotification:", name:"NotificationIdentifier", object: nil)

Remove Notification

NSNotificationCenter.defaultCenter().removeObserver(self, name: "NotificationIdentifier", object: nil)

Method of received Notification

func methodOfReceivedNotification(notification: NSNotification){
    //Action take on Notification
}

Tags: 
swift

instantiate vc programmaticly

let secondViewController:UIViewController = UIViewController()
    self.presentViewController(secondViewController, animated: true, completion: nil)

Tags: 
swift

CoreData: warning: Unable to load class named

1.

enter image description here

Notice that I corrected your entity name to the more appropriate singular.

2.
You should also follow the frequent recommendation to include

@objc(Show)
just above your class.

3.
Also make sure to cast the created managed object to the proper class, as the default would be just NSManagedObject.

var newShow = NSEntityDescription.insertNewObjectForEntityForName("Show",
inManagedObjectContext: context) as Show

Tags: 
swift

location core data database

func applicationDirectoryPath() -> String {
    return NSSearchPathForDirectoriesInDomains(.DocumentDirectory, .UserDomainMask, true).last! as String
}

Tags: 
swift

stateMachine

as global func/type

typealias StateMachineType = () -> Int

func makeStateMachine(maxState:Int) -> StateMachineType{
  var currrentState: Int = 0
 
  return {
   
    currrentState++
    if currrentState > maxState {
      currrentState = 0
    }
    return currrentState
  }
 
}

Tags: 
swift

Animations in swift

Music bars moving

func animationMusicBars() {
    let r = CAReplicatorLayer()
    r.bounds = CGRect(x: 0.0, y: 0.0, width: 60.0, height: 60.0)
    r.position = CGPoint(x: 60, y: 60)
    view.layer.addSublayer(r)
   
    let bar = CALayer()
    bar.bounds = CGRect(x: 0.0, y: 0.0, width: 8.0, height: 40.0)
    bar.position = CGPoint(x: 10.0, y: 75.0)
    bar.cornerRadius = 2.0
    bar.backgroundColor = UIColor.redColor().CGColor
   
    r.addSublayer(bar)
   
    let move = CABasicAnimation(keyPath: "position.y")
    move.toValue = bar.position.y - 35.0
    move.duration = 0.5
    move.autoreverses = true
    move.repeatCount = Float.infinity
   
    bar.addAnimation(move, forKey: nil)
   
    r.instanceCount = 6
    r.instanceTransform = CATransform3DMakeTranslation(9.0, 0.0, 0.0)
    r.instanceDelay = 0.13
    r.masksToBounds = true
   
  }

Spinning Blocks

func animationSpingBlocks(){
    let r = CAReplicatorLayer()
    r.bounds = CGRect(x: 0.0, y: 0.0, width: 200.0, height: 200.0)
    r.cornerRadius = 10.0
    r.backgroundColor = UIColor(white: 0.0, alpha: 0.75).CGColor
    r.position = CGPoint(x: 220, y: 120)
   
    view.layer.addSublayer(r)
   
    let dot = CALayer()
    dot.bounds = CGRect(x: 0.0, y: 0.0, width: 14.0, height: 14.0)
    dot.position = CGPoint(x: 100.0, y: 40.0)
    dot.backgroundColor = UIColor(white: 0.8, alpha: 1.0).CGColor
    dot.borderColor = UIColor(white: 1.0, alpha: 1.0).CGColor
    dot.borderWidth = 1.0
    dot.cornerRadius = 2.0
   
    r.addSublayer(dot)
   
    let nrDots: Int = 15
   
    r.instanceCount = nrDots
    let angle = CGFloat(2*M_PI) / CGFloat(nrDots)
    r.instanceTransform = CATransform3DMakeRotation(angle, 0.0, 0.0, 1.0)
   
    let duration: CFTimeInterval = 1.5
   
    let shrink = CABasicAnimation(keyPath: "transform.scale")
    shrink.fromValue = 1.0
    shrink.toValue = 0.1
    shrink.duration = duration
    shrink.repeatCount = Float.infinity
   
    dot.addAnimation(shrink, forKey: nil)
    r.instanceDelay = duration/Double(nrDots)
    dot.transform = CATransform3DMakeScale(0.01, 0.01, 0.01)
 
  }

source: http://www.ios-animations-by-emails.com/posts/2015-march#tutorial

Tags: 
swift

tableview

UITableview

properties:

var tableviewTitles = ["item 1","item 2", "item 3","item 4","item 5","item 6"]

in viewdidload()

self.tableView.registerClass(UITableViewCell.self, forCellReuseIdentifier: "cell")

obliged data en source methods

//MARK: tableview
  func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
    return tableviewTitles.count
  }
 
  func numberOfSectionsInTableView(tableView: UITableView) -> Int {
    return 1
  }
  let cellIdentifier = "cell"
  func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
    let cell = tableView.dequeueReusableCellWithIdentifier(cellIdentifier) as UITableViewCell
    cell.textLabel?.text = tableviewTitles[indexPath.row]
   
    return cell
   
  }

with a lot of (large) images:

extension ViewController{
    func numberOfSectionsInTableView(tableView: UITableView) -> Int {
        return 1
    }
    func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
        return images.count
    }
    func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
        let cell = tableView.dequeueReusableCellWithIdentifier("Cell", forIndexPath: indexPath)
        cell.textLabel?.text = images[indexPath.row]
        if cache.objectForKey("\(indexPath.row)") != nil
        {
            cell.imageView?.image = cache.objectForKey("\(indexPath.row)") as! UIImage
        }
        else{
           
        }
        return cell
    }
    func tableView(tableView: UITableView, willDisplayCell cell: UITableViewCell, forRowAtIndexPath indexPath: NSIndexPath) {
        if cache.objectForKey("\(indexPath.row)") != nil
        {
            cell.imageView?.image = cache.objectForKey("\(indexPath.row)") as! UIImage
        }
        else{
            cell.imageView?.image = UIImage(named: "placeholder.png")
            dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0)) {
                if let img = UIImage(named: "\(self.images[indexPath.row]).png")
                {
                    cell.imageView?.image = img
                    self.cache.setObject(img, forKey: "\(indexPath.row)")
                }
               
            }
        }
       
       
      
    }
}

Tags: 
swift

screen width height

let screenSize: CGRect = UIScreen.mainScreen().bounds
    let screenWidth = screenSize.width
    let screenHeight = screenSize.height

background color to image

self.view.backgroundColor = UIColor(patternImage: UIImage(named: "background.png"))

UIView:

let banner = UIView(frame: CGRectMake(x, y, width, height))

UIGraphicsBeginImageContext(banner.frame.size)
UIImage(named: "banner_promo")?.drawInRect(banner.bounds)
var image: UIImage = UIGraphicsGetImageFromCurrentImageContext()
UIGraphicsEndImageContext()
banner.backgroundColor = UIColor(patternImage: image)

Tags: 
swift

iosfonts.com

fonts info:
http://iosfonts.com

Tags: 
swift

Animate Image in UIImageView

for countValue in 1...20
    {
     
      var strImageName : String = countValue < 10 ?  "anim_jap000\(countValue).png" : "anim_jap00\(countValue).png"
     
      var image  = UIImage(named:strImageName)
      if image != nil{
       
        imgListArray.append(image!)
      }

      let animationImages:[AnyObject] = imgListArray
      imgView.animationImages = animationImages
      imgView.animationDuration = 1.5
      imgView.animationRepeatCount = 0
      imgView.startAnimating()
      //self.addSubview(loadingImageView)

Tags: 
swift

ScreenSize

let screenSize: CGRect = UIScreen.mainScreen().bounds
let screenWidth = screenSize.width
let screenHeight = screenSize.height

general func:

func getScreenSize() ->CGRect {
   
    return UIScreen.mainScreen().bounds
   
}

func getScreenWidth() ->CGFloat {
    let screenSize: CGRect = UIScreen.mainScreen().bounds
    return screenSize.width
   
}

func getScreenHeight() ->CGFloat {
    let screenSize: CGRect = UIScreen.mainScreen().bounds
    return screenSize.height
}

Tags: 
swift

static var in Objc replaced by statemachinetype in swift

typealias StateMachineType = ()->Int

func makeStateMachine(maxState:Int)->StateMachineType{
 
  var currentState:Int = 0
  return {
    currentState++
    if currentState > maxState{
      currentState = 0
    }
    return currentState
  }
}

Tags: 
swift

Are we on screen to load image?

var imageURL: NSURL? {
    didSet{
      image = nil
      if view.window != nil { //Are we on screen?
          fetchImage()
      }
     
    }
  }

Tags: 
swift

Segue Lines

voor naar vc met storyboardId
let vc = storyboard?.instantiateViewControllerWithIdentifier("Second") as SecondViewController    presentViewController(vc, animated: true, completion: nil)

Tags: 
swift

random int between

private int randInt(int min, int max) {

  Random rand = new Random();
  int randomNum = rand.nextInt((max - min) + 1) + min;

  return randomNum;
}

Tags: 
java

callback

class CallbackTest {
    var i = 5
    var callback: (Int -> ())? // NOTE: The optional callback takes an Int
    deinit { // NOTE: This is like -dealloc in Objective-C
        println("Deinit")
    }
}

var obj = CallbackTest()
obj.callback = {
    [unowned obj] // NOTE: Without this, deinit() would never be invoked!
    a in
    obj.i = a
}

Tags: 
swift

enum

enum Shape {
    case Dot
    case Circle(radius: Double) // Require argument name!
    case Square(Double)
    case Rectangle(width: Double, height: Double) // Require argument names!
    func area() -> Double {
        switch self {
        case Dot:
            return 0
        case Circle(let r): // Assign the associated value to the constant 'r'
            return 3.14*r*r
        case Square(let l):
            return l*l
        case Rectangle(let w, let h):
            return w*h
        }
    }
}
var shape = Shape.Circle(radius: 3.0)
shape.area()//28.26
shape = Shape.Dot
shape.area()//0.0
shape = .Square(2)
shape.area()//4.0
shape = .Rectangle(width: 3, height: 4) // Argument names required
shape.area()//12.0

Tags: 
swift

Hide status bar

add no to "View controller-based status bar appearance" in info.plist

add following to VC

override func prefersStatusBarHidden() -> Bool {
        return true
    }

Tags: 
swift

uiswitch

mainSwitch = UISwitch(frame: CGRect(x: 100, y: 100, width: 0, height: 0))
   
    /* Adjust the off-mode tint color */
    mainSwitch.tintColor = UIColor.redColor()
    /* Adjust the on-mode tint color */
    mainSwitch.onTintColor = UIColor.brownColor()
    /* Also change the knob's tint color */
    mainSwitch.thumbTintColor = UIColor.greenColor()
   
    view.addSubview(mainSwitch)

@IBAction func soundEffectsSwitchChanged(sender: UISwitch) {
   
    if sender.on {
     
      Settings().setSoundFx(true)
   
    } else {
     
      Settings().setSoundFx(false)
    }
  }

Tags: 
swift

uialert

var alert = UIAlertController(title: "No Internetconnection", message: "U heeft een internet connctie nodig om aankopen te kunnen doen", preferredStyle: UIAlertControllerStyle.Alert)
    alert.addAction(UIAlertAction(title: "Opnieuw", style: UIAlertActionStyle.Default, handler: { (paramAction:UIAlertAction!) in
     
      self.fetchCreditStoreItems()
    }))
    alert.addAction(UIAlertAction(title: "Cancel", style: UIAlertActionStyle.Default, handler: { (paramAction:UIAlertAction!) in
     
      self.performSegueWithIdentifier("buyCreditsToHomeVC", sender: self)
    }))
    self.presentViewController(alert, animated: true, completion: nil)

met invullen
var controller:UIAlertController?
 
  override func viewDidLoad() {
    super.viewDidLoad()
   
    controller = UIAlertController(title: "Please enter your username",
      message: "This is usually 10 characters long",
      preferredStyle: .Alert)
   
    let action = UIAlertAction(title: "Next",
      style: UIAlertActionStyle.Default,
      handler: {[weak self] (paramAction:UIAlertAction!) in
       
        if let textFields = self!.controller?.textFields{
          let theTextFields = textFields as [UITextField]
          let userName = theTextFields[0].text
          println("Your username is \(userName)")
        }
       
      })
   
    controller!.addAction(action)
   
    controller!.addTextFieldWithConfigurationHandler(
      {(textField: UITextField!) in
        textField.placeholder = "XXXXXXXXXX"
      })
   
  }
 
  override func viewDidAppear(animated: Bool) {
    super.viewDidAppear(animated)
    self.presentViewController(controller!, animated: true, completion: nil)
  }
 

simpel

  var controller:UIAlertController?
 
  override func viewDidLoad() {
    super.viewDidLoad()
   
    controller = UIAlertController(title: "Title",
      message: "Message",
      preferredStyle: .Alert)
   
    let action = UIAlertAction(title: "Done",
      style: UIAlertActionStyle.Default,
      handler: {(paramAction:UIAlertAction!) in
      println("The Done button was tapped")
      })
   
    controller!.addAction(action)
   
  }
 
  override func viewDidAppear(animated: Bool) {
    super.viewDidAppear(animated)
    self.presentViewController(controller!, animated: true, completion: nil)
  }

met action

controller = UIAlertController(
      title: "Choose how you would like to share this photo",
      message: "You cannot bring back a deleted photo",
      preferredStyle: .ActionSheet)
   
    let actionEmail = UIAlertAction(title: "Via email",
      style: UIAlertActionStyle.Default,
      handler: {(paramAction:UIAlertAction!) in
        /* Send the photo via email */
      })
   
    let actionImessage = UIAlertAction(title: "Via iMessage",
      style: UIAlertActionStyle.Default,
      handler: {(paramAction:UIAlertAction!) in
        /* Send the photo via iMessage */
      })
   
    let actionDelete = UIAlertAction(title: "Delete photo",
      style: UIAlertActionStyle.Destructive,
      handler: {(paramAction:UIAlertAction!) in
        /* Delete the photo here */
      })
   
    controller!.addAction(actionEmail)
    controller!.addAction(actionImessage)
    controller!.addAction(actionDelete)

of...

var alert = UIAlertController(title: "Alert", message: "Message", preferredStyle: UIAlertControllerStyle.Alert)
alert.addAction(UIAlertAction(title: "Click", style: UIAlertActionStyle.Default, handler: nil))
self.presentViewController(alert, animated: true, completion: nil)

handle actions
alert.addAction(UIAlertAction(title: "Ok", style: .Default, handler: { action in
    switch action.style{
    case .Default:
        println("default")

    case .Cancel:
        println("cancel")

    case .Destructive:
        println("destructive")
    }
}))

Tags: 
swift

attributes text with smart range

    let string = "iOS SDK" as NSString
   
    let result = NSMutableAttributedString(string: string)
   
    let attributesForFirstWord = [
      NSFontAttributeName : UIFont.boldSystemFontOfSize(60),
      NSForegroundColorAttributeName : UIColor.redColor(),
      NSBackgroundColorAttributeName : UIColor.blackColor()
    ]
   
    let shadow = NSShadow()
    shadow.shadowColor = UIColor.darkGrayColor()
    shadow.shadowOffset = CGSize(width: 4, height: 4)
   
    let attributesForSecondWord = [
      NSFontAttributeName : UIFont.boldSystemFontOfSize(60),
      NSForegroundColorAttributeName : UIColor.whiteColor(),
      NSBackgroundColorAttributeName : UIColor.redColor(),
      NSShadowAttributeName : shadow,
    ]
   
    /* Find the string "iOS" in the whole string and sets its attribute */
    result.setAttributes(attributesForFirstWord,
      range: string.rangeOfString("iOS"))
   
   
    /* Do the same thing for the string "SDK" */
    result.setAttributes(attributesForSecondWord,
      range: string.rangeOfString("SDK"))

Tags: 
swift

Loop through subviews

for view in self.view.subviews as [UIView] {
    if let textField = view as? UITextField {
        if textField.text == "" {
            // show error
            return
        }
    }
}

Tags: 
swift

Write/Read data to .plist file

First of all add a plist to your project in Xcode. For example “data.plist”.

NSError *error;
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES); //1
NSString *documentsDirectory = [paths objectAtIndex:0]; //2
NSString *path = [documentsDirectory stringByAppendingPathComponent:@”data.plist”]; //3

NSFileManager *fileManager = [NSFileManager defaultManager];

if (![fileManager fileExistsAtPath: path]) //4
{
NSString *bundle = [[NSBundle mainBundle] pathForResource:@”data” ofType:@”plist”]; //5

[fileManager copyItemAtPath:bundle toPath: path error:&error]; //6
}

1) Create a list of paths.
2) Get a path to your documents directory from the list.
3) Create a full file path.
4) Check if file exists.
5) Get a path to your plist created before in bundle directory (by Xcode).
6) Copy this plist to your documents directory.
next read data:
NSMutableDictionary *savedStock = [[NSMutableDictionary alloc] initWithContentsOfFile: path];

//load from savedStock example int value
int value;
value = [[savedStock objectForKey:@”value”] intValue];

[savedStock release];

write data:
NSMutableDictionary *data = [[NSMutableDictionary alloc] initWithContentsOfFile: path];

//here add elements to data file and write data to file
int value = 5;

[data setObject:[NSNumber numberWithInt:value] forKey:@”value”];

[data writeToFile: path atomically:YES];
[data release]

1) You must create a plist file in your Xcode project.
2) To optimize your app, better is to save all the data when application (or for example view) is closing. For instance in applicationWillTerminate. But if you are storing reeaaaally big data, sometimes it couldn’t be saved in this method, becouse the app is closing too long and the system will terminate it immediately.

Tags: 
objC

Remove Keyboard from view after typing txtField

// MARK: delegtes
   
    func textFieldShouldReturn(textField: UITextField) -> Bool {
        textField.resignFirstResponder()
        return true
    }
   
   
    override func touchesBegan(touches: NSSet, withEvent event: UIEvent) {
       
        self.view.endEditing(true)
    }
   

Tags: 
swift

uimaps location and annotation

class ViewController: UIViewController, MKMapViewDelegate, CLLocationManagerDelegate {

    @IBOutlet var mapView: MKMapView!
   
    var manager:CLLocationManager
   
   
    override func viewDidLoad() {
        super.viewDidLoad()
        // Do any additional setup after loading the view, typically from a nib.
       
        //core location
        manager.delegate = self
        manager.desiredAccuracy = kCLLocationAccuracyBest
        manager.requestWhenInUseAuthorization()
        manager.startUpdatingLocation()
       
       
        var lat:CLLocationDegrees = 40.748473
        var long:CLLocationDegrees = -73.985417
       
        var latDelta:CLLocationDegrees = 0.01
        var longDelta:CLLocationDegrees = 0.01
       
        var span:MKCoordinateSpan = MKCoordinateSpanMake(latDelta, longDelta)
        var location:CLLocationCoordinate2D = CLLocationCoordinate2DMake(lat, long)
       
        var region:MKCoordinateRegion = MKCoordinateRegionMake(location, span)
        mapView.setRegion(region, animated: true)
       
        var annotation:MKPointAnnotation = MKPointAnnotation()
        annotation.coordinate = location
        annotation.title = "Statue of Liberty"
        annotation.subtitle = "One day I will come by"
       
        mapView.addAnnotation(annotation)
       
       
    }

Tags: 
swift

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