Objective Questions in Swift2.2 @iPhone - Set C

     

Q.21 : var arr = [4,5,6,7,”Ravi"]  

           Is a

A.         Valid Declaration and Initialization of an Array

B.         Compile Time Error

C.         Run Time Error

D.        None of the Above

Q.22 : What will be the output

          var array  = [11,22,33,44,55]

          print(array.length)          

A.         Compile Time Error

B.         Run Time Error

C.         5

D.        None of the above

Q.23 : What will be the output

           var array  = [11,22,33,44,55]

           print(array.count)

    A.         Compile Time Error

B.       Run Time Error

C.         5

D.       None of the above

Q.24 Which syntax is valid for array declaration

A.        var arr : Array

B.        var arr : NSArray

C.        Both

D.        None

Q.25: What will be the output

          var array  = [11,22,33,44,55]

         print(array[3])

          

A.         Compile Time Error

B.         33

C.         44

D.        22

Q.26:  What will happen

          var array  = [11,22,33,44,55]

          array.append(1)

          print(array)

          

A.         Compile Time Error

B.         [11,22,33,44,55,1]

C.         [11,22,33,44,1]

D.        [1]

Q.27: What will be the output

          var array  = [11,22,33,44,55]

          array.removeAtIndex[2]

          print(array)

          

A.         Compile Time Error

B.         [11,22,33,55]

C.         [11,22,44,55]

D.        [11,22,33,44]

Q.28: What will be the output

          var array  = [111,22,33,404,-55]

          array.sort()

          print(array)

          

A.         Compile Time Error

B.         [22,33,111,404,-55]

C.         [-55,22,33,111,404]

D.        [111,22,33,404,-55]

Q.29: Which syntax is valid for Dictionary

     

      A.  var dictionary : NSDictionary

      B. var dictionary : Dictionary

      C. Both

      D. None

Q.30 What will be the output

        var dictionary = [“Android” : “Mobile OS”, ”Chess” :       

                                      ”Game”, ”Ravi” : “Trainer”]

       print(dictionary[“Ravi”])

A.         Mobile OS

B.         Game

C.         Trainer

D.        Compile Time Error

Answers   A     A    C     B     C     B    C    C    A    C 

How to Make a Simple TableView with iOS 9 and Swift2.2 @iPhone

If you are familiar with Android then you can consider  TableView in iOS as  ListView in Android.
To add  Table View in iOS the steps are
1. Create a new Project 
2. Add Table View in Main.storyboard
    2.1 : Click on Table View and set Prototype Cells 1 in the   
            property window of table 
    2.2 : Specify this cell with a name as an identifier ( i named as 
            mycell)
3.  Then click on Table with control and add dataSource and 
     delegate 
4. Create a reference of TableView in ViewController.swift 
5. Add UITableViewDelegate with you controller file as 
class ViewController: UIViewController , UITableViewDelegate
6.Add below mentioned function to add number of rows in your table 

func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int

{

   return intValue;  //intValue means a valid integer

}

7. Add below mentioned function to customise cell with data source as 

func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell

{

    return cell; //cell should be created by you 

}

8. You should have a valid data source from where you can get the data

See my example i am going to display a Table  of you inserted Number.

Output will be like 

code is as 

//  ViewController.swift

//  Table of Number

//

//  Copyright © 2016 Ravi. All rights reserved.

//

import UIKit

class ViewController: UIViewController , UITableViewDelegate {

    var getData : Int = 0   // Simple Variable 

    @IBOutlet var editText: UITextField! 

                      // TextField for number  insertion

    @IBOutlet var tableView: UITableView!  

                       // Reference of Table

    @IBAction func clickMe(sender: AnyObject) 

                       // Action on Button click

    {

        getData = Int(editText.text!)! 

                           // Read Data from TextField

        tableView.reloadData()  // Each Button Click Reload

    }

    

    override func viewDidLoad() {

        super.viewDidLoad()

        // Do any additional setup after loading the view, 

            typically from a nib.

    }

    func tableView(tableView: UITableView, 

           numberOfRowsInSection section: Int) -> Int

    {

        return 10    // 10 rows created 

    }

    func tableView(tableView: UITableView, 

           cellForRowAtIndexPath indexPath: NSIndexPath) -> 

           UITableViewCell

        

    {

        // Create Cell 

        let cell = UITableViewCell(style: 

                   UITableViewCellStyle.Default, 

                   reuseIdentifier: "mycell")

        

       // Update Cell

        cell.textLabel?.text = String (getData * 

                               (indexPath.row+1))

        return cell    // Return Cell

    }

}