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[原创](calleng逆向日记)Frida前置知识, ObjC runtime的"反射" KVC 实例代码理解和分析
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发表于: 2023-10-5 16:12
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入门学习逆向的个人笔记,预览(欢迎探讨)
- C/C++的学习和数据结构
[原创] [calleng的逆向日记] 22y11m-23y3m29d 实现macOS编辑, iOS端编译和调试C/C++
[原创] [calleng的逆向日记] 23/03/30 (C++概念构建篇01) 补充完毕
[分享] [calleng的逆向日记] 22y11m-23y6m7d Win10Arm下的 gdb调试.[数据结构/严蔚敏-之迷宫问题]
- iOS的学习和逆向
[分享] IOS软件安全工程师技能表(2017.7by非虫) (为自己学习导航) 图片不清楚下面有导图下载
[分享] Frida-Tool的一些 介绍, 和在 iOS下的一些用法 [个人笔记汇总]
[原创] [calleng的逆向日记] 弹窗的修改原理-OC篇 [源码学习和HOOK实践]23/09/24 --待续
[讨论] [calleng的逆向日记] 自学iOS逆向时候,如何自己解决问题.
[分享] [calleng逆向日记] iOS crackMe的破解 与 Frida(Objection) 的入门使用(thanks to roysue)
[分享] (iOS Hook原理,OC底层实现)Frida前置知识的(royuse)的一些知识注解(图片三次压缩失真,详情见附件)
[原创] (calleng逆向日记)Frida前置知识, ObjC runtime的"反射"-KVC-实例代码理解和分析
[分享] [calleng的逆向日记] Frida 前置知识, 类与方法的底层实现, 逻辑批注, (参考AloneMonkey的书)
[原创] (calleng逆向日记)Frida前置知识, ObjC runtime的"反射" KVC实例Demo分析第二部(Demo底部下载)
[分享] [calleng的逆向日记] iOS crackMe and Frida(Objection) Get Started (Oct,16th)
[分享] [calleng的逆向日记] Frida在iOS上内存漫游与黑盒调用 Get Started Section 4
KVC 实例代码
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 | //// Author.h// KVC-example//// Created by calleng on 2023/10/5.//#import <Foundation/Foundation.h>#import "Publish.h"NS_ASSUME_NONNULL_BEGIN@interface Author : NSObject@property (nonatomic, copy) NSString *name;@property (nonatomic, assign) NSInteger age;@property (nonatomic, strong) Publish *publish;- (void)test;@endNS_ASSUME_NONNULL_END |
Publish.h
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 | //// Publish.h// KVC-example//// Created by calleng on 2023/10/5.//#import <Foundation/Foundation.h>NS_ASSUME_NONNULL_BEGIN@interface Publish : NSObject@property (nonatomic, copy) NSString *title;@property (nonatomic, assign) double publishTime;@endNS_ASSUME_NONNULL_END |
ViewController.m
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 | //// ViewController.m// KVC-example//// Created by calleng on 2023/10/5.//#import "ViewController.h"#import "Publish.h"#import "Author.h"@interface ViewController ()@property (nonatomic, strong) Author *author;@property (nonatomic, strong) Publish *publish;@end@implementation ViewController- (void)viewDidLoad { [super viewDidLoad]; // Do any additional setup after loading the view. self.publish = [[Publish alloc] init]; self.author = [[Author alloc] init]; [self setValue]; [self getValue];}- (void)setValue{ //setValue [self.author setValue:@"calleng" forKey:@"name"]; [self.author setValue:@(29) forKey:@"age"]; [self.publish setValue:@(20231005) forKeyPath:@"publishTime"]; // [self.author setValue:self.publish forKey:@"publish"];//将 author 对象的 publish 属性设置为 publish 对象。 [self.author setValue:@"KVC example" forKeyPath:@"publish.title"]; // [self.author setValue:self.publish forKeyPath:@"publish"]; NSLog(@"\n\n作者名字 - %@, 作者年纪 - %ld\n", self.author.name, (long)self.author.age); NSLog(@"\n\n作者发布的书名 self.author.publish.title = %@, self.author.publish.publishTime = %f\n", self.author.publish.title, self.author.publish.publishTime );}- (void)getValue{ NSString *authorName = [self.author valueForKey:@"name"]; NSInteger authorAge = [[self.author valueForKeyPath:@"age"]integerValue]; Publish *publish = [self.author valueForKey:@"publish"]; NSString *publishTitle1 = [publish valueForKeyPath:@"title"]; NSString *publishTitle2 = [self.author valueForKeyPath:@"publish.title"]; double publishTime1 = [[publish valueForKey:@"publishTime"] doubleValue]; double publishTime2 = [[self.author valueForKeyPath:@"publish.publishTime"] doubleValue]; NSLog(@"\n\n 作者名字 : %@, 年纪: %lu \n", authorName, authorAge); NSLog(@"\n\n 发布的书名: \n publishTitle1 = %@ publishTitle2 = %@, \n 发布的时间: \n publishTime1 = %f publishTime2 = %f", publishTitle1, publishTitle2, publishTime1, publishTime2 );}@end |
这里的Author类型中, 包含3个属性: name属性 , age属性, Publish类型的 publish属性
Publish类型中包含, title属性, publishTime属性
实际代码的结构类似于, 作者这个类中,包含 发布的这个子类,
关键代码
- [self.author setValue:self.publish forKey:@"publish"];//将 author 对象的 publish 属性设置为 publish 对象。
- 否则 [self.author setValue:@"KVC example" forKeyPath:@"publish.title"]; 里的点语法路径访问不会起作用.
重要语句注释
1 [self.author setValue:self.publish forKey:@"publish"];这行代码将 self.publish 对象的值设置给 self.author 对象的 publish 属性。
2 [self.author setValue:@"KVC example" forKeyPath:@"publish.title"];
这行代码尝试将字符串 "KVC example" 设置为 self.author 对象的 publish 属性的 title 子属性的值。键路径 "publish.title" 指定了要设置的属性是 self.author 的 publish 属性的 title 子属性。这将更改 self.author 对象的 publish.title 子属性的值。
3 [self.author setValue:self.publish forKeyPath:@"publish"];这行代码将 self.publish 对象的值设置给了 self.author 对象的 publish 属性。
需要注意的是，第二行代码中的键路径 "publish.title" 指定了要设置的属性是 self.author 的 publish 属性的 title 子属性。这将更改 self.author 对象的 publish.title 子属性的值，而不是直接设置 self.author 的 publish 属性的值。
因此，这三行代码中，第一行和第三行代码都成功设置了 self.author 的 publish 属性的值，而第二行代码成功设置了 self.author 的 publish.title 子属性的值。
Publish *publish = [self.author valueForKey:@"publish"];
这行代码从 self.author 对象中获取 publish 属性的值。由于 publish 属性的类型是 Publish，因此你将这个值存储在 publish 变量中。NSString *publishTitle2 = [self.author valueForKeyPath:@"publish.title"];这行代码通过键路径 "publish.title" 获取 self.author 对象的 publish 属性的 title 子属性的值。这相当于嵌套访问属性，先获取 publish 属性，然后再获取其 title 子属性。double publishTime2 = [[self.author valueForKeyPath:@"publish.publishTime"] doubleValue];这行代码通过键路径 "publish.publishTime" 获取 self.author 对象的 publish 属性的 publishTime 子属性的值。这也是嵌套访问属性，先获取 publish 属性，然后再获取其 publishTime 子属性的值。
以上关键code演示了如何使用 KVC 来获取对象的属性值，包括直接访问属性和使用键路径访问嵌套属性。键路径允许你访问对象图中的多个级别的属性。
[招生]科锐逆向工程师培训(2024年11月15日实地，远程教学同时开班, 第51期)
