Swift Basics - Array and Dictionary

Simple Values

let -> make a constant

var -> make a variable 

In order to assign a value, we may not write type explicitly

Example:

    let constantValue = 20

        let constantValue2 : Int = 20

 Error:  Cannot assign to 'let' value 'constantValue'

constantValue = 30.5

 Error:  Cannot assign to 'let' value 'constantValue2’

        constantValue2 = 30

Change let to var

  var Value = 20

        var Value2 : Int = 20

      

 Error:  Type 'Int' does not conform to protocol 'FloatLiteralConvertible'

        Value = 30.5

  It’s OK

        Value2 = 30

Convert to “Int” type to “String” type

let stringValue = "The height of frame is "

        let height = 100

        let ​heightLabel​ = stringValue + String(height)

        

        

        println(​heightLabel​)

Convert to any type to String type basically.

  let height = 100

        let stringValue = "The height of frame is  \(height)"

        let ​heightLabel​ = stringValue

        

        

        println(​heightLabel​)

Change an item of array

        var arrayList = ["cat","dog","bird"]

        arrayList[1] = "penguen"

        

        for var i=0; i<arrayList.count; i++

        {println(arrayList[i])

        }

Add an item of array by using append method

        arrayList.append("bear")

 

Add an array of one or more compatible items

        arrayList += ["cow","butterfly"]

To insert an item into the array at a specified index:

        arrayList.insert("bee", atIndex: 4)

To remove an item from array

  arrayList.removeAtIndex(5)

Basic AutoLayout Example in iOS - 1

Let's make a basic autolayout example.

Firstly add a blue view the upper left corner.

Add the constraints for the blue view

height = 100
width = 100

Update Frames for blue view

Seconly, add a purple view the center

Add the constraints for the purple view

height = 200
width = 200

In order to show a view on the center, we must add alignment constraints:

1. Horizontal center in Container

2. Vertical center in Container

Update Frames for purple view

Finally add a orange view the upper left corner.

Add the constraints for the orange view

height = 100
width = 100

Update Frames for orange view

Let's control storyboard preview for iPhone sizes.

Result for iPhone 6

You can download from  https://github.com/ozlemakalin/BasicAutoLayoutExample

Custom Button in Swift

Custom Buttons 

Create a swift file for custom button

Create a custom button class

class CustomButton: UIButton {

     required init(coder aDecoder: NSCoder) {

        super.init(coder: aDecoder)

        self.layer.borderColor = UIColor.yellowColor().CGColor

        self.layer.borderWidth = 5

        self.backgroundColor = UIColor.redColor()

        

}

}

Define custom button class in Storyboard

For custom button with imageview and label

Create view and add imageview and label in view
Add button on image view and label
Define constraints

 Result

You can download from https://github.com/ozlemakalin/custombuttonswift

Custom tableviewcell iOS Development in Swift

Custom tableviewcell example is developed for Swift language.

An examle for Custom tableviewcell in mobile development

Create a new project

Choose swift language

Add a table view and TableView Delegate and DataSource protocols in ViewController