Class (2) and protocol

List of articles

Chapter one OC The singleton model
Chapter two OC Object initialization of
The third chapter OC Such creation and agreement
Chapter four OC And main Function operation and basic concepts

Preface

This article introduces the creation and protocol of classes

---

One 、 class

What is a class? ？

Class is an important part of object-oriented , We can treat a class as a kind of custom data .
You can use classes to define variables . This type of variable is equivalent to a pointer type variable ;

Defining classes

Interface part ： Define the member variables and methods contained in this class
Implementation part ： Provide implementation for methods of classes

Class interface ：

The realization of the class ：

Two 、 agreement

The definition of protocol is similar to interface , Used to define the specifications that multiple classes should follow
The protocol does not provide any implementation

3、 ... and 、 Create a new one XiyouMobilePerson class

User Class interface ：

#import <Foundation/Foundation.h>

NS_ASSUME_NONNULL_BEGIN

@interface User : NSObject
@property(nonatomic,copy) NSString*name;
@property(nonatomic,assign) int age;

@end

NS_ASSUME_NONNULL_END

User The realization of the class ：

#import "User.h"

@implementation User
@synthesize name;
@synthesize age;
@end

Class interface

#import <Foundation/Foundation.h>
#import"User.h"
NS_ASSUME_NONNULL_BEGIN

@interface XiyouMobilePerson : User{
    
    int iOS;
    int web;
    NSString* andriod;
    NSString* server;
}
-(void)setiOS:(int)i;
-(void)setWeb:(int)w;
-(void)setAndriod:(NSString*)a;
-(void)setServer:(NSString*)s;
-(int)getiOS;
-(int)getWeb;
-(NSString*)getAndriod;
-(NSString*)getServer;
@end

NS_ASSUME_NONNULL_END

The realization of the class ：

#import "XiyouMobilePerson.h"

@implementation XiyouMobilePerson
-(void)setiOS:(int)i{
    
    if(i%2==1){
    
        i = i + 1;
    } else{
    
        i = i - 1;
    }
    iOS = i;
}
-(void)setWeb:(int)w{
    
    web = w;
}
-(void)setServer:(NSString*)s{
    
    server = s;
}
-(void)setAndriod:(NSString *)a{
    
    andriod = a;
}
-(int)getiOS{
    
    return iOS;
}
-(int)getWeb{
    
    return web;
}
-(NSString*)getServer{
    
    return server;
}
-(NSString*)getAndriod{
    
    return andriod;
}
@end

test ：

#import"User.h"
#import"XiyouMobilePerson.h"
#import<Foundation/Foundation.h>
int main() {
    
    @autoreleasepool {
    
        XiyouMobilePerson* p = [[XiyouMobilePerson alloc]init];
        [p setiOS:99];
        [p setWeb:98];
        [p setServer:@"97"];
        [p setAndriod:@"96"];
        NSLog(@"setiOS = %d,setWeb = %d,setServer = %@,setAndroid = %@",[p getiOS],[p getWeb],[p getServer],[p getAndriod]);
    }
}

result ：

Four 、 Create a new one Model class

Class interface ：

#import <Foundation/Foundation.h>

NS_ASSUME_NONNULL_BEGIN

@interface Model : NSObject
@property(nonatomic, stong) NSMutableArray* XiyouMobileArrey;
@end

NS_ASSUME_NONNULL_END

The realization of the class ：

#import "Model.h"

@implementation Model
@synthesize XiyouMobileArrey;
@end

test ：

#import"User.h"
#import"Model.h"
#import<Foundation/Foundation.h>
int main () {
    
    @autoreleasepool {
    
        Model* m = [[Model alloc]init];
        m = @"iOS";
        NSLog(@"%@",m);
        
    }
}

give the result as follows ：

5、 ... and 、 Create a new one Demand agreement

Demand.h

// Demand.h
// gy-OC.5.29
//
//

#import <Foundation/Foundation.h>

NS_ASSUME_NONNULL_BEGIN
@protocol  Demand <NSObject>
@required
-(int)calculate;
@optional
-(int)unnessary;
@end

NS_ASSUME_NONNULL_END

XiiyouMobilePerson.m

#import "XiyouMobilePerson.h"
#import"Demand.h"
@implementation XiyouMobilePerson
-(void)setiOS:(int)i{
    
    if(i%2==1){
    
        i = i + 1;
    } else{
    
        i = i - 1;
    }
    iOS = i;
}
-(void)setWeb:(int)w{
    
    web = w;
}
-(void)setServer:(NSString*)s{
    
    server = s;
}
-(void)setAndriod:(NSString *)a{
    
    andriod = a;
}
-(int)getiOS{
    
    return iOS;
}
-(int)getWeb{
    
    return web;
}
-(NSString*)getServer{
    
    return server;
}
-(NSString*)getAndriod{
    
    return andriod;
}
-(int)calculate{
    
    return iOS + web;
}
@end

test ：

#import"XiyouMobilePerson.h"
#import"Demand.h"
#import<Foundation/Foundation.h>
int main(){
    
    @autoreleasepool {
    
        XiyouMobilePerson* p = [[XiyouMobilePerson alloc]init];
        [p setiOS:99];
        [p setWeb:98];
        [p setServer:@"97"];
        [p setAndriod:@"96"];
        int a =[p calculate];
        NSLog(@"iOS + web = %d",a);
    }
}

result ：