Objective_C_01类和对象

//创建对象（ alloc在堆内存开辟空间）并且给person对象进行初始化
main.m
Person *person = [[Person alloc]init]];
person->name = @"文强";
person->age = 12;
person->gender = @"男";

Person.h
{
    NSString *_name;
    NSInteger _age;
    NSString *_gender;

}
- (void)sayHi;
- (void)eat;
- (void)setName:(NSString *)name age:(NSInteger)age gender:(NSString *)gender;

Person.m

- (void)sayHi{
 NSLog(@"我是%@,我今年%ld,我的性别是%@",_name,_age,_gender);
}
- (void)eat {
    NSLog(@"吃");
}
- (void)setName:(NSString *)name age:(NSInteger)age gender:(NSString *)gender{
    _name = name;
    _age = age;
    _gender = gender;
[self sayhi];

}