Stack Implementation in swift

public struct Stack{
 private var array:[T]
 public var maxSize:Int?

 public init(){
    array = []

//MARK: isEmpty
 public var isEmpty:Bool{
 return array.count == 0

//MARK: count
 public var count:Int{
 return array.count
 public mutating func push(element:T){
 if (maxSize != nil){
 if array.count >= maxSize{
 public mutating func pop()->T?{
 if isEmpty{
 return nil
 return array.removeLast()

//MARK: get Peek element
 public func peek()->T?{
 return array.last

//use this stack
var myStack = Stack()

Strava integration in iOS

Strava is a website and  mobile app used to track athletic activity via GPS. Its headquarters are located in California. The most popular activities tracked using the software are  Cycling and running.

If we are developing a health based application , sometimes we need to fetch data from Strava for analysis .In this tutorial , we will show you how to fetch data from Strava.

Strava provide full API to fetch data from their server . for more detail .

  1. Strava API work with Oauth 2.0 , go through and register your app and get ClientId , Client Secret .
  2. Download OAuth library from
  3. Download demo STRAVA app from



Enjoy coding




FitBit AOuth in iOS app

The Fitbit API allows developers to interact with Fitbit data in their own applications, products and services. The API allows for most of the read and write methods that you will need to support your application. If you have uses or needs that are not currently supported by the API, drop by the Dev Forum and let us know! We look forward to working closely with the development community to make the Fitbit API a system that enables you to do awesome, mind blowing stuff.

You can fetch fitbit data in your health app , please follow following procedure.

  1. Resister your application in fit bit developer account
  1. Copy Client Id and consumer_secret , It will be used in your Application.
  2. Download FitBit-Auth-for-iOS from Drag and drop MSYFitBit.swift in your application. Dard and drop OAuthSwift files in your project. In AppDelegate

func application(app: UIApplication, openURL url: NSURL, options: [String : AnyObject]) -> Bool {
if ( == "fivedotsFitbit") {
return true

In Your ViewController

MSYFitBit.shareFitBit.fetchDataFromFitbit { (result, success) -> Void in


CoreData Day-1 :: What is coreData ?


Core Data:: Core Data is an object graph and persistence framework provided by Apple in the Mac OS X and iOS operating systems. It was introduced in Mac OS X 10.4 Tiger and iOS with iPhone SDK 3.0. It allows dataorganised by the relational entity–attribute model to be serialised into XML, binary, or SQLite stores.

Core Data Features

The Core Data framework provides generalized and automated solutions to common tasks associated with object life-cycle and object graphmanagement, including persistence. Its features include:

  • Change tracking and undo support.Core Data provides built-in management of undo and redo beyond basic text editing.
  • Relationship maintenance.Core Data manages change propagation, including maintaining the consistency of relationships among objects.
  • Futures (faulting).Core Data can reduce the memory overhead of your program by lazily loading objects. It also supports partially materialized futures, and copy-on-write data sharing.
  • Automatic validation of property values.Core Data’s managed objects extend the standard key-value coding validation methods that ensure that individual values lie within acceptable ranges so that combinations of values make sense.
  • Schema migration.Dealing with a change to your application’s schema can be difficult, in terms of both development effort and runtime resources. Core Data’s schema migration tools simplify the task of coping with schema changes, and in some cases allow you to perform extremely efficient in-place schema migration.
  • Optional integration with the application’s controller layer to support user interface synchronization.Core Data provides the NSFetchedResultsController object on iOS, and integrates with Cocoa Bindings on OS X.
  • Full, automatic, support for key-value coding and key-value observing.In addition to synthesizing key-value coding and key-value observing compliant accessor methods for attributes, Core Data synthesizes the appropriate collection accessors for to-many relationships.
  • Grouping, filtering, and organizing data in memory and in the user interface.
  • Automatic support for storing objects in external data repositories.
  • Sophisticated query compilation.Instead of writing SQL, you can create complex queries by associating an NSPredicate object with a fetch request. NSPredicate provides support for basic functions, correlated subqueries, and other advanced SQL. With Core Data, it also supports proper Unicode, locale-aware searching, sorting, and regular expressions.
  • Merge policies.Core Data provides built in version tracking and optimistic locking to support automatic multi-writer conflict resolution.

Why Should You Use Core Data?

There are a number of reasons why it may be appropriate for you to use Core Data. One of the simplest metrics is that, with Core Data, the amount of code you write to support the model layer of your application is typically 50% to 70% smaller as measured by lines of code. This is primarily due to the features listed above—the features Core Data provides are features you don’t have to implement yourself. Moreover they’re features you don’t have to test yourself, and in particular you don’t have to optimize yourself.

Core Data has a mature code base whose quality is maintained through unit tests, and is used daily by millions of customers in a wide variety of applications. The framework has been highly optimized over several releases. It takes advantage of information provided in the model and runtime features not typically employed in application-level code. Moreover, in addition to providing excellent security and error-handling, it offers best memory scalability of any competing solution. Put another way: you could spend a long time carefully crafting your own solution optimized for a particular problem domain, and not gain any performance advantage over what Core Data offers for free for any application.

In addition to the benefits of the framework itself, Core Data integrates well with the OS X tool chain. The model design tools allow you to create your schema graphically, quickly and easily. You can use templates in the Instruments application to measure Core Data’s performance, and to debug various problems. On OS X desktop, Core Data also integrates with Interface Builder to allow you to create user interfaces from your model. These aspects help to further shorten your application design, implementation, and debugging cycles.

What Core Data Is Not

Having given an overview of what Core Data is and does, and why it may be useful, it is also useful to correct some common misperceptions and state what it is not.

  • Core Data is not a relational database or a relational database management system (RDBMS).Core Data provides an infrastructure for change management and for saving objects to and retrieving them from storage. It can use SQLite as one of its persistent store types. It is not, though, in and of itself a database. (To emphasize this point: you could for example use just an in-memory store in your application. You could use Core Data for change tracking and management, but never actually save any data in a file.)
  • Core Data is not a silver bullet.Core Data does not remove the need to write code. Although it is possible to create a sophisticated application solely using the Xcode data modeling tool and Interface Builder, for more real-world applications you will still have to write code.
  • Core Data does not rely on Cocoa bindings.Core Data integrates well with Cocoa bindings and leverages the same technologies—and used together they can significantly reduce the amount of code you have to write—but it is possible to use Core Data without bindings. You can readily create a Core Data application without a user interface

Common method in Swift

1. Check for any field empty in NSDictionary

class func checkforEmptyValueinDictioanty(dic:NSDictionary)-> Bool{

for (keyVal, dataVal) in dic {

  if (dataVal.length()==0){

                println(\(keyVal): \(dataVal.length()))

                return false




        return true


2.Email validation

class func isValidEmail(testStr:String) -> Bool {

let fullNameArr = testStr.componentsSeparatedByString(“@”)

        var firstPart: String = fullNameArr[0]

        if let range = firstPart.rangeOfCharacterFromSet(NSCharacterSet.letterCharacterSet()){


            return false


      let emailRegEx = “[A-Z0-9a-z._%+-]+@[A-Za-z0-9.-]+\\.[A-Za-z]{2,4}”

 var emailTest = NSPredicate(format:“SELF MATCHES %@”, emailRegEx)

        let result = emailTest.evaluateWithObject(testStr)

        return result


3. Alert in Swift

class func commonAlert(title:String,msg:String,curView:UIViewController){

        var device : UIDevice = UIDevice.currentDevice();

        var systemVersion = device.systemVersion;

        var iosVerion : Float = (systemVersion as NSString).floatValue

        if(iosVerion >= 8.0) {


        var alert = UIAlertController(title: title, message: msg, preferredStyle: UIAlertControllerStyle.Alert)

            alert.addAction(UIAlertAction(title: “Ok”, style: UIAlertActionStyle.Default, handler: nil))

                  // return alert

            curView.presentViewController(alert, animated: true, completion: nil)


            let alert=UIAlertView(title: title, message: msg, delegate: self, cancelButtonTitle: “ok”)





4. NSUserDefaults in swift as common function

class func saveToUserDefault(value:AnyObject, key:String)


        NSUserDefaults.standardUserDefaults().setObject(value, forKey:key)




    class func userDefaultForKey(key:String) -> String


        return NSUserDefaults.standardUserDefaults().objectForKey(key) as NSString



    class func userDefaultForAny(key:String) -> AnyObject


        return NSUserDefaults.standardUserDefaults().objectForKey(key) as AnyObject!



    class func userdefaultForArray(key:String) -> Array<AnyObject>


        return NSUserDefaults.standardUserDefaults().objectForKey(key) as Array



    class func removeFromUserDefaultForKey(key:String)






5.Get screen height and width

let _screenWidth=UIScreen.mainScreen().bounds.size.width

let _screenHeight=UIScreen.mainScreen().bounds.size.height

Use different font text in a Label in swift

let secondLabel=UILabel(frame: CGRectMake(0, 16, _screenWidth2, 20))



        secondLabel.font=UIFont(name: “Arial”, size: 12)



        let attrSting=NSMutableAttributedString(string: “I agree to the Terms of Service and Privacy Policy.”)


        NSLog(“text length is %d”, attrSting.length)


        attrSting.addAttribute(NSFontAttributeName, value: UIFont(name: “Helvetica-bold”, size: 14), range: NSMakeRange(15, 16))


        attrSting.addAttribute(NSFontAttributeName, value: UIFont(name: “Helvetica”, size: 12), range: NSMakeRange(31,4 ))


        attrSting.addAttribute(NSFontAttributeName, value: UIFont(name: “Helvetica-bold”, size: 14), range: NSMakeRange(35, 15))



Use HexColor in Swift as a color

Add it in your class 

extension UIColor {

   convenience init(red: Int, green: Int, blue: Int) {

       assert(red >= 0 && red <= 255, “Invalid red component”)

       assert(green >= 0 && green <= 255, “Invalid green component”)

       assert(blue >= 0 && blue <= 255, “Invalid blue component”)

       self.init(red: CGFloat(red) / 255.0, green: CGFloat(green) / 255.0, blue: CGFloat(blue) / 255.0, alpha: 1.0)


   convenience init(netHex:Int) {

       self.init(red:(netHex >> 16) & 0xff, green:(netHex >> 8) & 0xff, blue:netHex & 0xff)



Use it where you need…….

var color = UIColor(red: 0xFF, blue: 0xFF, green: 0xFF)

var color2 = UIColor(netHex:0xFFFFFF)

Call a function using Notification in Xcode

Step 1: Post Notification from class A.

NSString *data=@”Demo”;[[NSNotificationCenter defaultCenter] postNotificationName:@”golferUpdate” object:nil userInfo:data];if you do not want to pass data use 

[[NSNotificationCenter defaultCenter] postNotificationName:@golferUpdate object:nil];

Step 2: Register Notification in Class B.

[[NSNotificationCenterdefaultCenter] addObserver:selfselector:@selector(GetData:) name:@”golferUpdate”object:nil];

Step 3: Add function GetData

-(void)GetData:(NSNotification *)notification{

    NSDictionary *dict = [notification userInfo];

// write your code Here




Step 4: Enjoy Coding………..

Best Of Luck.