What is NSNumber in Swift?
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 .
How do I use NSNumber in Objective C?
You need to create it via a method invocation such as: [p setAge:[NSNumber numberWithInt:10]]; Your current code is attempting simply to cast the arbitrary integer 10 to a pointer.
What is NSArray Objective C?
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.
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.
What is the key difference between NSArray and NSMutableArray?
3 Answers. Show activity on this post. NSMutableArray (and all other classes with Mutable in the name) can be modified. So, if you create a plain NSArray , you cannot change its contents later (without recreating it).
What is any and AnyObject in 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.
What is difference between any and AnyObject in Swift?
Any can represent an instance of any type at all, including function types. AnyObject can represent an instance of any class type.