Swift Developer

☛ Firstly, think like a user while designing the UX.

☛ Consider all the situations that prove to be useful while promoting an App.

☛ Continue to work on the utility of the App, even after the launch.

Mention the advantages?

A few of the many advantages of using swift are:

☛ Optional types

☛ Closures

☛ Built-in error handling

☛ Much faster than other languages

☛ Supports pattern matching

☛ Type-safe language

☛ Firstly, determine the iOS version or model of the device.

☛ Collect enough information to reproduce the issue.

☛ If possible, acquire device logs.

☛ Acquire tooling or create a unit test and begin debugging once you get the idea of the nature of the issue.

The question mark (?) is used during the declaration of a property. If the property does not hold a value, the question mark (?) helps to avoiding application errors.

Example looks like -

class Employee {

var certificate : [Certificates]?

}

let employee = Employee();

Example 2 -

let middleName : String? = nil

let lastName : String = "Muhammad"

let name : String = middleName ?? lastName

It enables you to store the key-value pairs and access the value by providing the key.It is similar to that of the hash tables in other programming languages.

Adapter – It lets the classes with incompatible interfaces to work together and it wraps itself around the object to expose a standard interface to interact with that object.

Memento – This pattern in iOS is used as a part of state restoration.

That is this externalized state can be restored without violating any encapsulation.This pattern is especially used for the archiving in Apple.

It is one of the programming languages and also a system creating an application for iOS and OS X.

For Cocoa and Cocoa touch, this programming language is considered to be an innovative one.

Continue, Break, Fallthrough and Return. However, while it’s important to know these control statements, what would really impress an interviewer is being able to have a dialogue around how each of you uses these controls, which you use most often, etc.

There are four data types that the developers mostly use in Objective – C.

☛ BOOL – It represents a Boolean value that is true or false.

☛ NSInteger – It represents an Integer.

☛ NSString – It represents a string.

☛ Cgfloat – It represents a floating-point value.

Swift Programming-

☛ In a swift programming, the variables and constants are declared before use.

☛ In a swift programming, “var” keyword used for variable and “let” keyword for constant.

☛ In a swift programming, no need to end code with semi-colon

☛ In a swift programming, does not require creating a separate interface like Objective-C.

☛ In a swift programming, we can define methods in class, structure or enumeration.

Objective-C Programming-

☛ In objective-C programming, we need to end code with semi-colon

☛ In objective-C programming, we can declare constant as int and variable as NSString.

The Nested multiline comments enable you to comment out large blocks of code quickly and easily.

Use an opening (/*: ) and closing ( */) comment and it looks like -

/*:

The above forward slash (/) and an asterisk (*) then a colon (:) is opening comment - (/*:)

…

The below an asterisk (*) and forward slash is closing comment – (*))

*/

@synthesize – It generates the getter and setter methods for the property.

@dynamic – It notifies the compiler that the getter and setter are implemented at some other place.

Adapter – It lets the classes with incompatible interfaces to work together and it wraps itself around the object to expose a standard interface to interact with that object.

Memento – This pattern in iOS is used as a part of state restoration.

That is this externalized state can be restored without violating any encapsulation.This pattern is especially used for the archiving in Apple.

The states of the common execution can be as follows:

Not running – This state means that there is no code that is being executed and the application is completely switched off.

Inactive – This state means that the application is running in the background and is not receiving any events.

Active – This state means that the applications are running in the background and is receiving the events.

Background – This state means that the application is executing the code in the background.

Suspended – This state means that the application is in the background and is not executing.

B-trees are search trees that provide an ordered key-value store with excellent performance characteristics. In principle, each node maintains a sorted array of its own elements, and another array for its children.

Retaining an object means the retain count increases by one. This means the instance of the object will be kept in memory until it’s retain count drops to zero. The property will store a reference to this instance and will share the same instance with anyone else who retained it too. Copy means the object will be cloned with duplicate values. It is not shared with any one else.

Basically, it is a type that contains a group of various related values under the same umbrella.

The term “defer” is a keyword that provides a block of code that executes when the execution is leaving the current scope.