objective-c构造函数举例

＃include  <Foundation/Foundation.h>

#include  <stdio.h>

@interface  Container:NSObject

{

int number;

}

-(void) setNumber:(int) n;

-(int) intValue;

-(Container*) init:(int)n;

@end;

@implementation Container

-(void) setNumber:(int) n

{

number=n;

}

-(int) intValue

{

return number;

}

//构造函数

-(Container*)init:(int) n

{

self=[super  init];

if (self){

[self setNumber:n];

}

return self;

}

@end

int main(void)

{

Container  *object=[[Container new]   init : 3];

printf( "The number is %i\n",  [object intValue]);

return 0;

}

输出结果：

The number is 3