Swift Interview Questions and Answers

It is fast, safe, modern, and enables a level of interactivity in development. Swift Programming contains a number of features such as closures, generics, and type inference that make it much easier to use.

• Safer, faster and more powerful
• Can co-exist alongside Objective-C
• Innovative features
• It offers Interactive Coding styles
• APIs are easier to maintain and read
• One of the best ways to code OS X and IOS apps

When you are trying to perform extra clean-up of your classes, you can define a block called deinit.
Here is the Syntax:
deinit {
    //Your cleanup statement here.
}

Swift -

• No need to finish code with a semi-colon.
• The syntax is simple and clear.
• Does not allow multiple inheritance.

Objective-C

• Need to finish code with a semi-colon.
• The syntax is difficult to master.
• Allows multiple inheritance.

UI in Swift are connected similar to the way we do in Objective-C. Binding process is the same, only core level has changed. You can select button/label on xib file and bind as is it.

It is a process of querying and calling various properties. You can chain multiple queries together, but if any link is nil, the entire chain will fail.

The way to handle errors in Swift is different from Objective-C. In Swift, you can declare that a function has thrown an error. A function that calls this method must do it from a try block. It is the caller's responsibility to handle the error. This process is quite similar to how we handle errors in Java.

Swift is the latest, open source programming language from Apple, which is very easy to learn. The language is available for developing OS X, iOS, and watchOS apps. It allows developers to prototype and write apps faster and with fewer bugs than ever before.

Swift 5.0

Yes, It is a very powerful, intuitive open source programming language developed by Apple for iOS, macOS, watchOS, tv OS, and Linux etc.

Functions

• Self-contained code that performs a specific task.
• Identified by their name to call whenever a task is required.
• To declare a function, use func.
• Use . -> to separate function parameters parenthesis and return type.

Methods

• Associated with a particular type.
• The first parameter name is given by default.
• Enumeration and Structure define methods.