How to declare an Array in Swift

Hi Readers!

There are different ways to declare Array in Swift. I will write few examples below:

Example 1:

1. let a : Array? = ["hello","hi"]

Now in above example this is a constant array. You cannot add/append an element in it.

Example 2: Below both versions of declaring array are same

1. var a2 = Array<String>()
2. var a3 = [String]()

Here is not the end….

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How to declare Sets in Swift

Hi Readers!

Let us first understand what Sets means.

Sets

“A set stores unique values of same type in a collection with no ordering. Sets should be used when there is no defined order, such as in Array. Secondly Array can store multiple same values but Sets can't. Sets are distinct."

Hash Values for Set Types

Whatever type you take it should be hashable to be stored in a set. It means that the type must provide a way to compute a hash value. A hash value is an Int value so that same objects can be compared equally, such as if `a == b`, if follows that `a.hashValue == b.hashValue`.

All basic swift types (Int, String, Bool and Double) are hashable by default. Enumerations case values are also hashable by default.

Set Type Syntax

Swift Set is written as `Set` where `Element` is the type that the set will store.

Creating and Initializing an Empty Set

1. var pets = Set<String>()

Here pets is set which can store String values

Creating a Set with values The example below creates a set called pets to Store String values:

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Load custom cell(Xib) in UITableView in swift

if you would like to Load custom cell(Xib) in UITableView in swift ,you may use the following code ->

1. func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
2.       return array.count;   //This function returns number of rows in table view
3.   }
4. 
   
5. 
   
6. func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {

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How to show an alert view in Swift Programming Language?

To show an alert in Swift programming language, you need to first import the UIKit framework then use UIAlertController object. A UIAlertController object displays an alert message to the user. To Read complete information about alert view in Swift Programming Language visit FindNerd.

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Quick reference of Swift Language comparison with Objective C

Quick reference of swift language comparison with Objective C code

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