初始化
- (id)initWithName:(NSString *)name
gender:(NSInteger)age{
if(self = [super init]){
_name = name;
_age = age;
}
return self;
}
便利构造器
+ (id)personWithName:(NSString *)name
gender:(NSInteger)age{
Person *person = [[Person alloc]initWithName:name gender:gender];
return person;
}