NSString *testObject = [[NSData alloc］]init];

OC :[[Person alloc] init]runtime :objc_msgSend(objc_msgSend("Person" , "alloc"), "init")还有我们调用方法的时候，是这个样子的OC：[object　 method]Runtime：object_msgSend(obj,@selector(method));

        - (void)viewDidLoad {[super viewDidLoad];unsigned int count = 0;Ivar *ivars = class_copyIvarList([SQKPerson class], &count);for (int i = 0; i<count; i++) {// 取出i位置对应的成员变量Ivar ivar = ivars[i];// 查看成员变量const char *name = ivar_getName(ivar);NSLog(@"%s", name);}

2015-10-28 22:47:41.186 runtime[2312:108141] _age
2015-10-28 22:47:41.186 runtime[2312:108141] _height
2015-10-28 22:47:41.186 runtime[2312:108141] _name

//
//  SQKPerson.m
//  runtime
//
//  Created by SQK on 15/10/28.
//  Copyright © 2015年 SQK. All rights reserved.
//

#import "SQKPerson.h"
#import <objc/runtime.h>/***  进行归档接档，需要遵守NSCoding协议*/
@interface SQKPerson ()<NSCoding>
//在这里声明了属性
@property (nonatomic, assign) int age;
@property (nonatomic, assign) int height;
@property (nonatomic, copy) NSString *name;@end@implementation SQKPerson- (void)encodeWithCoder:(NSCoder *)encode
{unsigned int count = 0;Ivar *ivars = class_copyIvarList([SQKPerson class], &count);for (int i = 0; i<count; i++) {//获取Ivars成员变量Ivar ivar = ivars[i];//需要将name转成URTF8类型的const char *name = ivar_getName(ivar);NSString *key = [NSString stringWithUTF8String:name];//归档id value = [self valueForKey:key];[encode encodeObject:value forKey:key];}//需要管理内存
    free(ivars);
}-(instancetype)initWithCoder:(NSCoder *)decoder{if (self= [super init]) {unsigned int  count = 0;Ivar *ivars = class_copyIvarList([SQKPerson class], &count);for (int i = 0; i<count; i++) {//取出对应的成员变量Ivar ivar = ivars[i];const char *name = ivar_getName(ivar);//结档NSString *key = [NSString stringWithUTF8String:name];//通过key取到成员变量（kvc）id value = [decoder decodeObjectForKey:key];//设置value到成员变量身上
            [self setValue:value forKey:key];}free(ivars);}return self;
}@end