Swift class and struct

Classes and struct have many commonalities:

 

Define attributes to store data

Define method execution function processing

Define subscripts and access their values through subscripts

Initialize their status

Extend its functions through extension

Complies with the Protocol, which provides a specific standard

Function

Functions of the analogy struct:

Can inherit another class

Ability to check the types of objects during runtime

Destructor release resources

Reference count allows a class instance to have multiple references

Class and struct Definition

Define classes and struct:

class SomeClass {// class definition goes here } struct SomeStructure { // structure definition goes here }

 

Instance:

struct Resolution { var width= 0 var height =0} class VideoMode { var resolution = Resolution() var interlaced =falsevarframeRate = 0.0 var name: String?}

 

 

Class and struct instantiation

struct Resolution { var width= 0 var height =0}class VideoMode { var resolution = Resolution()var interlaced =falsevarframeRate = 0.0var name: String?}let someResolution= Resolution()//let               someResolution                    = Resolution(width:10,height:20)let someVideoMode= VideoMode()

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