What is a NSArray?

NSArray is Objective-C’s general-purpose array type. It represents an ordered collection of objects. NSArray is immutable, so we cannot dynamically add or remove items. Its mutable counterpart, NSMutableArray, will be discussed in the second part of this tutorial.

How do you declare NSArray in Objective-C?

In Objective-C, the compiler generates code that makes an underlying call to the init(objects:count:) method. id objects[] = { someObject, @”Hello, World!”, @42 }; NSUInteger count = sizeof(objects) / sizeof(id); NSArray *array = [NSArray arrayWithObjects:objects count:count];

What is an NSArray in Swift?

NSArray is an immutable Objective C class, therefore it is a reference type in Swift and it is bridged to Array . NSMutableArray is the mutable subclass of NSArray .

What is an NSMutableArray?

The NSMutableArray class declares the programmatic interface to objects that manage a modifiable array of objects. This class adds insertion and deletion operations to the basic array-handling behavior inherited from NSArray . NSMutableArray is “toll-free bridged” with its Core Foundation counterpart, CFMutableArray .

How do I declare NSArray?

The NSArray class contains a class method named arrayWithObjects that can be called upon to create a new array object and initialize it with elements. For example: NSArray *myColors; myColors = [NSArray arrayWithObjects: @”Red”, @”Green”, @”Blue”, @”Yellow”, nil];

What is difference between NSArray and NSMutableArray?

The primary difference between NSArray and NSMutableArray is that a mutable array can be changed/modified after it has been allocated and initialized, whereas an immutable array, NSArray , cannot. This syntax creates an instance of an array for us.

What is NSNumber in Objective-C?

NSNumber is a subclass of NSValue that offers a value as any C scalar (numeric) type. It defines a set of methods specifically for setting and accessing the value as a signed or unsigned char , short int , int , long int , long long int , float , or double or as a BOOL .

What is difference between any and AnyObject in Swift?

Any and AnyObject are two special types in Swift that are used for working with non-specific types. Any can represent an instance of any type at all, including function types and optional types. AnyObject can represent an instance of any class type.

What is difference between string and NSString in Swift?

NSString : Creates objects that resides in heap and always passed by reference. String: Its a value type whenever we pass it , its passed by value. like Struct and Enum, String itself a Struct in Swift. But copy is not created when you pass.

Is Objective-C object oriented?

About Objective-C. Objective-C is the primary programming language you use when writing software for OS X and iOS. It’s a superset of the C programming language and provides object-oriented capabilities and a dynamic runtime.

How do I create an NSDictionary in Objective-C?

Objective-C Language NSDictionary

Create# NSDictionary *dict = [[NSDictionary alloc] initWithObjectsAndKeys:@”value1″, @”key1″, @”value2″, @”key2″, nil];
NSDictionary to NSArray.
NSDictionary to NSData.
NSDictionary to JSON.
Block Based Enumeration.
Fast Enumeration.

What can AnyObject represent Swift?

Any and AnyObject are two special types in Swift that are used for working with non-specific types. According to Apple’s Swift documentation, Any can represent an instance of any type at all, including function types and optional types. AnyObject can represent an instance of any class type.

How does the NSArray class work in Objective C?

For more information about object literals in Objective-C, see Working with Objects in Programming with Objective-C. In Swift, the NSArray class conforms to the ArrayLiteralConvertible protocol, which allows it to be initialized with array literals.

Which is an array object in Objective C?

NSArray and NSMutableArray are the Objective C array objects. In this tutorial we’ll discuss NSArray at a basic level along with various functions available in the class. NSArray help us in creating static array in Objective C programming.

What is nsmutablearray and what does NSArray do?

NSArray and its subclass NSMutableArray manage ordered collections of objects called arrays. NSArray creates static arrays, and NSMutableArray creates dynamic arrays. You can use arrays when you need an ordered collection of objects.