20150609构造方法和self指针

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// Dog.h

// IOS150609_ObjectiveC_ConstructFunctionAndSelf

// Created by Peng Junlong on 15/6/9.

#import <Foundation/Foundation.h>

@interface Dog : NSObject

{

NSString *_name;

NSInteger _age;

}

//构造方法必须以init开头,一般是initWithXxx,返回类型一定是id类型

//在一个类里面可以有多个构造方法, 但是一个对象只可以调用一次构造方法

//构造方法作用：（1）.构造出来一个类的实例（2）.对构造出来个一个类的实例（对象）初始化。

//无参构造方法

- (id)init; //返回对象的地址

//带一个参数

- (id)initWithName:(NSString *)name;

- (id)initWithAge:(NSInteger)age;

//带两个参数

- (id)initWithAge:(NSString *)name andAge:(NSInteger)age;

//getter方法

- (NSString *)name;

- (NSInteger)age;

//setter方法

- (void)setName:(NSString *)name setAge:(NSInteger)age;

//类方法

+ (void)testDog;

@end

//******************************************************************

// Dog.m

// IOS150609_ObjectiveC_ConstructFunctionAndSelf

// Created by Peng Junlong on 15/6/9.

#import "Dog.h"

@implementation Dog

- (id)init

{

if (self = [super init]) {

}

return self;

}

- (id)initWithName:(NSString *)name

{

if (self = [super init]) {

_name = name;

}

return self;

}

- (id)initWithAge:(NSInteger)age

{

if (self = [super init]){

_age = age;

}

return self;

}

- (id)initWithAge:(NSString *)name andAge:(NSInteger)age

{

if (self = [super init]){

_age = age;

_name = name;

}

return self;

}

- (void)setName:(NSString *)name setAge:(NSInteger)age

{

_name = name;

_age = age;

}

- (NSString *)name

{

return _name;

}

- (NSInteger)age

{

return _age;

}

+ (void)testDog

{

id dog = [self alloc];

dog = [dog initWithAge:@"小白" andAge:3];

NSLog(@"name = %@,age = %ld",[dog name],[dog age]);

}

@end

//===============================================

// Cat.h

// IOS150609_ObjectiveC_ConstructFunctionAndSelf

// Created by Peng Junlong on 15/6/9.

//*************************

//* 类方法(+) *

//*************************

#import <Foundation/Foundation.h>

@interface Cat : NSObject

{

NSString *_name;

NSInteger _age;

}

+ (id)catCreate;

- (NSString *)name;

- (NSInteger)age;

- (void)setName:(NSString *)name setAge:(NSInteger)age;

@end

//==============================================

// Cat.m

// IOS150609_ObjectiveC_ConstructFunctionAndSelf

// Created by Peng Junlong on 15/6/9.

#import "Cat.h"

@implementation Cat

+(id)catCreate

{

id cat = [[self alloc] init];

return cat;

}

- (NSString *)name

{

return _name;

}

- (NSInteger)age

{

return _age;

}

- (void)setName:(NSString *)name setAge:(NSInteger)age

{

_age = age;

_name = name;

}

@end

//=============================================

// Calculate.h

// IOS150609_ObjectiveC_ConstructFunctionAndSelf

// Created by Peng Junlong on 15/6/9.

#import <Foundation/Foundation.h>

@interface Calculate : NSObject

+ (NSInteger)calculateSum:(NSInteger)x andX:(NSInteger)y;

@end

//==============================================

// Calculate.m

// IOS150609_ObjectiveC_ConstructFunctionAndSelf

// Created by Peng Junlong on 15/6/9.

#import "Calculate.h"

@implementation Calculate

+ (NSInteger)calculateSum:(NSInteger)x andX:(NSInteger)y

{

return x+y;

}

@end

//============================================

// main.m

// IOS150609_ObjectiveC_ConstructFunctionAndSelf

// Created by Peng Junlong on 15/6/9.

//****************************

//* 构造方法与self指针 *

//****************************

#import <Foundation/Foundation.h>

#import "Dog.h"

#import "Cat.h"

#import "Calculate.h"

//#include 与 #import区别:

//1.#ifndef "Dog.h" #define "Dog.h" #endif 防止头文件被重定义

//2.用#import不需要担心头文件被重复包含,重复包含会报错;而#include则需要使用预编译指令

//@class打断循环链,防止循环包含

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

@autoreleasepool {

[Dog testDog];

Dog *xiaohei = [[Dog alloc] initWithName:@"小黑"];

NSLog(@"name = %@,age = %ld",[xiaohei name],[xiaohei age]);

Cat *cat = [Cat catCreate];

[cat setName:@"小花" setAge:4];

NSLog(@"name = %@,age = %ld",[cat name],[cat age]);

NSLog(@"Sum = %ld",[Calculate calculateSum:4 andX:7]);

}

return 0;

}

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