自定义构造函数 重写类描述，可以people *peoA=[[people alloc]init];直接输出NSLog(@"%@",peoA);
#import <Foundation/Foundation.h>
//自定义构造函数
@interface People : NSObject
{
#pragma mark 人类年龄
NSInteger age;
#pragma mark 人类姓名
NSString *name;
#pragma mark 人类身高
NSInteger height;
}
//自定义构造函数 命名必须符合initXXX
//内部实现
//if(self = [super init])
//{
//
//}
//return self;
/**
* 初始化人类信息实例构造函数
*
* @param newAge 人类年龄
* @param newName 人类姓名
* @param newHeight 人类身高
*
* @return 人类对象
*/
- (id)initWithAge:(NSInteger)newAge
AndName:(NSString *)newName
AndHeight:(NSInteger)newHeight;
/**
* 初始化人类信息类构造函数
*
* @param newAge 人类年龄
* @param newName 人类姓名
* @param newHeight 人类身高
*
* @return 人类对象
*/
+ (id)initWithAge:(NSInteger)newAge
AndName:(NSString *)newName
AndHeight:(NSInteger)newHeight;
- (void)display;
- (NSString *)description;
@end
#import "People.h"
@implementation People
/**
* 初始化人类信息实例构造函数
*
* @param newAge 人类年龄
* @param newName 人类姓名
* @param newHeight 人类身高
*
* @return 人类对象
*/
- (id)initWithAge:(NSInteger)newAge
AndName:(NSString *)newName
AndHeight:(NSInteger)newHeight
{
if(self = [super init])
{
age = newAge;
name = newName;
height = newHeight;
}
return self;
}
/**
* 初始化人类信息类构造函数
*
* @param newAge 人类年龄
* @param newName 人类姓名
* @param newHeight 人类身高
*
* @return 人类对象
*/
+(id)initWithAge:(NSInteger)newAge
AndName:(NSString *)newName
AndHeight:(NSInteger)newHeight
{
People *peo = [[People alloc]initWithAge:newAge
AndName:newName
AndHeight:newHeight];
return peo;
}
- (void)display
{
NSLog(@"name:%@,age:%ld,height:%ld",name,age,height);
}
/**
* 类的描述，不重写的话是显示类的内存地址
*
* @return 描述
*/
- (NSString *)description
{
NSString *str = [NSStringstringWithFormat:@"name:%@,age:%ld,height:%ld",name,age,height];
return str;
}
@end
#import <Foundation/Foundation.h>
#import "People.h"
int main(int argc, const char * argv[]) {
@autoreleasepool {
People *peoA = [[People alloc]init];
People *peoB = [[People alloc]initWithAge:18
AndName:@"旺财"
AndHeight:189];
// People *peoC = [People new]; 等同于 People *peoA = [[People alloc]init];
NSLog(@"%@",peoA);
NSLog(@"%@",peoB);
People *peoC = [People initWithAge:18 AndName:@"大黄" AndHeight:178];
NSLog(@"%@",peoC);
}
return 0;
}
