自定义构造方法

#import <Foundation/Foundation.h>

#import "Person.h"

#import "Student.h"

 

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

{

 

    @autoreleasepool {

        Student *p = [[Student alloc] initWithName:@"Jim" andAge:29 andNo:10];

        NSLog(@"00000");

    }

    return 0;

}

 

#import <Foundation/Foundation.h>

 

@interface Person : NSObject

@property NSString *name;

@property int age;

 

/*

 自定义构造方法的规范

 1.一定是对象方法，一定以 - 开头

 2.返回值一般是id类型

 3.方法名一般以initWith开头

*/

 

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

 

- (id)initWithAge:(int)age;

 

// initWithName:andAge:

- (id)initWithName:(NSString *)name andAge:(int)age;

 

@end

 

#import "Person.h"

 

@implementation Person

 

- (id)init

{

    if ( self = [super init] )

    {

        _name = @"Jack";

    }

    return self;

}

 

- (id)initWithName:(NSString *)name

{

 

    if ( self = [super init] )

    {

        _name = name;

    }

    

    return self;

}

 

- (id)initWithAge:(int)age

{

    if ( self = [super init] )

    {

        _age = age;

    }

    return self;

}

 

- (id)initWithName:(NSString *)name andAge:(int)age

{

    if ( self = [super init] )

    {

        _name = name;

        _age = age;

    }

    return self;

}

 

@end

 

 

#import "Person.h"

 

@interface Student : Person

@property int no;

 

- (id)initWithNo:(int)no;

 

- (id)initWithName:(NSString *)name andAge:(int)age andNo:(int)no;

 

@end

 

#import "Student.h"

 

@implementation Student

- (id)initWithNo:(int)no

{

    if ( self = [super init] )

    {

        _no = no;

    }

    return self;

}

 

// 父类的属性交给父类方法去处理，子类方法处理子类自己的属性

- (id)initWithName:(NSString *)name andAge:(int)age andNo:(int)no

{

    // 将name、age传递到父类方法中进行初始化

    if ( self = [super initWithName:name andAge:age])

    {

        _no = no;

    }

    

    return self;

}

 

//- (id)initWithName:(NSString *)name andAge:(int)age andNo:(int)no

//{

//     if ( self = [super init] )

//     {

//         _no  = no;

//         //_name = name;

//         self.name = name;

//         self.age = age;

//         

//         //[self setName:name];

//         //[self setAge:age];

//     }

//    

//    return self;

//}

@end