OC_ inheritance, convenience constructors, initialization methods

Main.m

Oc3_ inheritance, convenience constructors, initialization methods

//

Created by Dllo on 15/7/16.

Copyright (c) 2015 CML. All rights reserved.

//

#import <Foundation/Foundation.h>

#import "LuZhangZombie.h"

#import "TieTongZombie.h"

int main (int argc, const char * argv[]) {

Inheritance: Subclasses inherit all characteristics of the parent class and behave

When the object executes the method, the subclass overrides the method of the parent class, the method of the subclass is used, and if there is no override, the method of the parent class

Luzhangzombie *luzom =[[luzhangzombie alloc] init];

[Luzom walk];

[Luzom attack];

[Luzom loseequipment];

//

Tietongzombie *tiezom =[[tietongzombie alloc] init];

[Tiezom walk];

Inheritance is unidirectional, a class can have only one parent class, but a class may have countless subclasses

NSObject is the parent class of all classes, or it can be called a base class

The inheritance of a class is transitive

NSLog (@ "%@", [Tiezom class]);

C language If the operation against a null pointer, such as assignment, the system runs to this code directly crashes, and OC encountered a null pointer to the code as a scrap code, will execute, but will not have any effect

Zombie *zom =[zombie zombiewithblood:100 attack:20 speed:10];

[Zom attack];

return 0;

}

Zombie.h

Oc3_ inheritance, convenience constructors, initialization methods

//

Created by Dllo on 15/7/16.

Copyright (c) 2015 CML. All rights reserved.

//

#import <Foundation/Foundation.h>

@interface Zombie:nsobject

Characteristics

{

Nsinteger _blood;

Nsinteger _attack;

CGFloat _speed;

}

Behavior

-(void) walk;

-(void) attack;

-(void) dead;

-(ID) Initwithblood: (Nsinteger) Blood

Attack: (Nsinteger) attack

Speed: (cgfloat) speed;

Convenience Builder

+ (Zombie *) Zombiewithblood: (Nsinteger) Blood attack: (Nsinteger) Attack Speed: (cgfloat) speed;

+ (Zombie *) Zombiewithblood: (Nsinteger) Blood attack: (Nsinteger) Attack Speed: (cgfloat) speed;

+ (Zombie *) Zombiewithblood: (Nsinteger) Blood attack: (Nsinteger) Attack Speed: (cgfloat) speed;

@end

Zombie.m

Oc3_ inheritance, convenience constructors, initialization methods

//

Created by Dllo on 15/7/16.

Copyright (c) 2015 CML. All rights reserved.

//

#import "Zombie.h"

@implementation Zombie

-(void) walk{

NSLog (@ "Normal zombie is walking");

}

-(void) attack{

NSLog (@ "Normal zombie is attacking");

}

-(void) dead{

NSLog (@ "Normal zombie is dying");

}

Declaration of a custom initialization method

-(ID) Initwithblood: (Nsinteger) Blood

Attack: (Nsinteger) attack

Speed: (cgfloat) speed

{

The full version of the initialization method

The county invokes the initialization method of the parent class and sets the member variables inherited by the parent class.

Self =[super init];

When this object has a problem during initialization, a null pointer is returned, and if the next copy of the null pointer is meaningless, skip over and if a normal heap space pointer is returned, continue assigning the value

if (self) {

_speed =speed;

_blood =blood;

_attack=attack;

}

return self;

}

+ (Zombie *) Zombiewithblood: (Nsinteger) Blood attack: (Nsinteger) Attack Speed: (cgfloat) speed{

Class method

The convenience constructor puts the object creation process into the program's. m file, so that through the class, directly can create an object directly out

The System class provides a number of ways to facilitate the constructor

Zombie *zom = [[Zombie alloc] Initwithblood:blood attack:attack speed:speed];

return zom;

}

@end

Person.h

Oc3_ inheritance, convenience constructors, initialization methods

//

Created by Dllo on 15/7/17.

Copyright (c) 2015 CML. All rights reserved.

//

#import <Foundation/Foundation.h>

@interface Person:nsobject

3 Member variables

{

NSString *_name;

NSString *_sex;

Nsinteger _age;

}

Sayhi method

-(void) sayhi;

Set accessor

-(void) SetName: (NSString *) name;

-(void) Setsex: (NSString *) sex;

-(void) Setage: (Nsinteger) age;

-(NSString *) name;

-(NSString *) sex;

-(Nsinteger) age;

Custom initialization methods (3 member variables)

-(ID) Initwithname: (NSString *) name

Sex: (NSString *) Sex

Age: (Nsinteger) age;

Traverse Constructor (3 member variables)

+ (person *) Personwithname: (NSString *) name

Sex: (NSString *) Sex

Age: (NSString *) age;

@end

Person.m

Oc3_ inheritance, convenience constructors, initialization methods

//

Created by Dllo on 15/7/17.

Copyright (c) 2015 CML. All rights reserved.

//

#import "Person.h"

@implementation person

-(void) sayhi{

NSLog (@ "%@,%@,%ld", _name, _sex, _age);