UI/UX Designer from Mumbai, Maharashtra, India.
Apple Inc. (commonly known as Apple) is an American multinational technology company headquartered in Cupertino, California, that designs, develops, and sells consumer electronics, computer software, and online services.
What is a Dictionary?
The Dictionary is an unordered List that can be quickly accessed by key
Here is how you can declare an Empty Dictionary
var emptyDictionary = [String : Int]()
Dictionary with Predefined Key Pairs
var apps = ["Productivity" : "Keynote", "Social" : "Facebook", "Music" : "iTunes"]
Accessing the First Key Element of the Dictionary
var optionalApp = apps["Productivity"] // Keynote
What is an Array?
An array is an ordered list with indices / Index.
Examples of an array are a to-do list, shopping list, Amazon Wish List, etc.
Let’s say we have an array list of apps
Index:
0 1 2 3
Element:
“Reminders” “Mail” “Xcode” “Calendar”
Important Note:
The index of the first element always starts with zero because the way computer scientists deal with data in memory, they have offset & offset starts with zero & that’s why the Array begins with zero. The index of an array never exceeds the number of elements.
Here is how to declare an Array in Swift:
We will declare an array with the let or var keyword, the identifier name, the equal sign, and square brackets. A comma separates each element.
var apps = ["Reminders", "Mail", "Xcode", "Calendar"] // Array of Strings, Each element is of Type String
var number = [1, 2, 300, 4000] // Array of Integers, Each element is of Type Integer
var bools = [true, false, false, true] // Array of Boolean values, Each element is of Type Bool
var groups = [["John", "Tom", "Steve"], ["Brandon", "Bill"]] // Array inside array
All About String in Swift Programming Language
Let’s know what String is. String is a collection of characters
Here is how to declare a String
var courseName = "iOS Development"
var language = "Swift"
Here is how to use functions like String Concatenation, i.e. attaching one String to a second string
var hello = "Hello, "
let world = "World! "
let sentence = hello + world + "This is iOS Development" // "Hello, world! This is iOS Development"
Important Note:
As you can see above, we have used the ‘+’ operator to concatenate two strings together
Data Types in Swift Language
Integers i.e. Int:
1, 2, 3, 199, 1000
Float & Doubles:
3.14, 1.168, M_PI
Boolean Values like Bool:
true or false
Collection of Characters like Strings:
“iOS Development”, “Apple”, “1.2”
We can create our data type using the keywords Struct & Class.
All About Variables
Here is how we declare Variables in Swift:
First, we start with the ‘var’ keyword, then ‘Identifier Name’ & ‘Initial Value.’
Here is how to Declare Integer values: Int
var thisYear = 2017
var ourAge = 20
Here is how to Declare Empty Integer
var emptyInteger = Int()
Here is how to Declare a String
var courseName = "iOS Development"
var language = "Swift"
var software = "Xcode"
About Swift
Swift Programming Language is a new sensation, something happening, or the next paradigm in the computer programming world. Apple introduced Swift at WWDC, Apple’s World Wide Developer Conference, in 2014. Apple declared Swift an Open-Source Programming Language on December 3, 2015.
Swift is getting a warm welcome from the development community as a breath of fresh air for their daily programming job.
Swift natively supports Unicode Characters, Emojis, and Asian Languages like Devanagari Characters & Chinese Characters. Which was lacking in 30-year-old programming Languages like C & Objective-C
Here is what others say about Swift Programming Language from Apple to Wikipedia.
(more…)You may be programming a Universal App for iPhone, iPad, or iPad Pro and wondering how to write conditional code for those variant iOS device sizes.
So here is how to write code by identifying the device height of your display or frame.
Here is how to solve this situation by identifying device height,
Note:
This code uses the native bounds of the device, so it will work for all current devices that may be in landscape or portrait mode. Code is written in Swift Programming Language.
Here is the situation in your Xcode project where you want to call a method from another class Swift file to your original class of Swift file.
Let’s call your original swift class file ‘FirstViewController’, which has ‘UIViewController’ as a superclass.
The second swift that you want to call a function from, we will assume that it has ‘SecondViewController’ as the class name & it has ‘UIViewController’ as a superclass.
You have written a function called ‘print something()’ in your ‘SecondViewController’ that would be triggered when somebody taps on the button present on ‘FirstViewController’ as IBAction called ‘print this(sender: UIButton)’
So, you will write a print function as follows:
(more…)
Here is a simple solution to create a single PDF by combining multiple files from various file types.
Assumption: I Assume you have 10 PNG files you want to combine into a single PDF file.
Note: It doesn’t matter if those ten files have different height & width dimensions.
Here is how to do this:
Step 01:
Locate & Open Preview in the Applications folder on your Macintosh
Step 02:
Select Preview. Now go to File > Open.
Step 03:
Select & Open all desired files in Preview
As per Wikipedia:
Disk Utility is a system utility for performing disk and disk volume-related tasks on the macOS.
Day-to-day functions supported by Disk Utility are:
Now, we will learn how to partition disks,
Important Note:
Precaution: Before proceeding, backup all your computer data using Time Machine on a hard drive other than the one you are currently partitioning.
Here is how to Partition a disk
Step 01:
Connect the External Disk to your Mac using a USB / FireWire cable to partition it
Step 02:
Locate ‘Disk Utility App in Applications > Utilities
Here is how to transfer backups from a current backup drive to a new high-capacity backup drive
Step 01: First, check the format of your new backup drive
Step 02: Set permissions on your new backup drive