What is a NSString?

An NSString object encodes a Unicode-compliant text string, represented as a sequence of UTF–16 code units. The objects you create using NSString and NSMutableString are referred to as string objects (or, when no confusion will result, merely as strings). The term C string refers to the standard char * type.

What is NSString in swift?

NSString is a class Swift is interoperatable with Objective-C and converts some Objective-C types to Swift types. Types that can be converted between Obj-C and Swift are known as bridged types. String and NSString are example of such bridged types and hence you can assign NSString to a String variable.

What is Nsurl?

An object representing the location of a resource that bridges to URL ; use NSURL when you need reference semantics or other Foundation-specific behavior.

What is Nsrange?

A structure used to describe a portion of a series, such as characters in a string or objects in an array.

What is the difference between NSString and string?

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.

How do I append to NSString?

The format specifier “%@” is used to insert string values. The example below uses a combination of whitespace and %@ format specifiers to append two strings to string1: NSString * string3 = [string1 stringByAppendingFormat:@” %@ %@”, string2, @”A third string.

What is NSMutableArray Objective-C?

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 .

What is the difference between NSURLSession and NSURLConnection?

An NSURLConnection object handles a single request and any follow-on requests. An NSURLSession object manages multiple tasks, each of which represents a single URL request and any follow-on requests.

What is Nsbundle in IOS?

A representation of the code and resources stored in a bundle directory on disk.

What is NSMakeRange?

It’s a convenience inline function, used to create an NSRange struct , populate it and return it: (from …/Foundation.framework/Headers/NSRange.h ) NS_INLINE NSRange NSMakeRange(NSUInteger loc, NSUInteger len) { NSRange r; r.location = loc; r.length = len; return r; }

What is index in Swift?

Index for every String is that Characters in Swift are not all the same length under the hood. A single Swift Character might be composed of one, two, or even more Unicode code points. Thus each unique String must calculate the indexes of its Characters.

What does NS mean in Swift?

NeXTSTEP
The Foundation Kit, or just Foundation for short, is an Objective-C framework in the OpenStep specification. It provides basic classes such as wrapper classes and data structure classes. This framework uses the prefix NS (for NeXTSTEP). It is also part of Cocoa and of the Swift standard library.