What is an NSNumber?
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 .
Why use NSNumber?
The purpose of NSNumber is simply to box primitive types in objects (pointer types), so you can use them in situations that require pointer-type values to work. One common example: you have to use NSNumber if you want to persist numeric values in Core Data entities.
What is NSInteger in Objective C?
NSInteger is a type definition that describes an integer – but it is NOT equivalent to int on 64-bit platforms. You can examine the typedef by cmd-clicking on NSInteger in Xcode. NSInteger is defined as int when building a 32-bit app and as long for 64-bit apps.
Is NSInteger primitive?
5 Answers. Show activity on this post. NSNumber is a class, not a primitive, and is used when you need to put raw numbers into dictionaries, arrays, or otherwise encapsulate them. NSInteger , NSUInteger , CGFloat , etc are simple types and correspond (on 32-bt systems like the iPhone) to int , unsigned int and float .
What is NSData in IOS?
A static byte buffer that bridges to Data ; use NSData when you need reference semantics or other Foundation-specific behavior. iPadOS 2.0+ macOS 10.0+
What is NSMutableArray in Swift?
Overview. 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 .
Is Objective-C low level?
The language objective C uses null pointers and hence is type safe compared to C. It is basically a low level language that stands too close to assembly level language. Objective C is a high-level language stuffed with small talk messaging style together with C.
Which is better Swift or Objective-C?
Apple states that Swift is almost 2.6 times faster than Objective C. The speed at which one can code using Swift is significantly higher than on Objective C. The syntax on Swift is much simpler and direct.
What is Objective C runtime?
The Objective-C runtime is a runtime library that provides support for the dynamic properties of the Objective-C language, and as such is linked to by all Objective-C apps. Objective-C runtime library support functions are implemented in the shared library found at /usr/lib/libobjc.