[求助]新人关于KVO问题请教，谢谢大家

最近研究runtime，在网上看到一个大神写的runtime手动实现KVO，自己试了试
但是却出现一些问题，想求助各位大神 新人第一次发帖。

---

结构:

• 在ViewController中监听people(继承自NSobject)类的name。
• 监听类NSObject (KVO)，具体的监听实现。

方法：
* people类：

#import <Foundation/Foundation.h>

@interface people : NSObject

@property(nonatomic,copy)NSString *name;

@end

• NSObject (KVO)

#import <Foundation/Foundation.h>

@interface NSObject (KVO)

-(void)PE_addobserve:(NSObject *)observer forkeyPath:(NSString *)keypath options:(NSKeyValueObservingOptions)options context:(void *)context;
@end

具体实现

#import "NSObject+KVO.h"

#import <objc/runtime.h>

#import <objc/message.h>


@implementation NSObject (KVO)


-(void)PE_addobserve:(NSObject *)observer forkeyPath:(NSString *)keypath options:(NSKeyValueObservingOptions)options context:(void *)context
{

    //保存observer
    objc_setAssociatedObject(self, (__bridge const void*)@"objc", observer, OBJC_ASSOCIATION_RETAIN_NONATOMIC);


    //动态生成新的对象
    NSString *oldstring=NSStringFromClass([self class]);

    NSString *newString=[@"PE_" stringByAppendingString:oldstring];

    const char* newname=[newString UTF8String];

    //注册新类，添加方法
    Class newclass=objc_allocateClassPair([self class], newname, 0);

    class_addMethod(newclass, @selector(setName:),(IMP)setName,"[e-mail]:@");

    objc_registerClassPair(newclass);

    object_setClass(self, newclass);


}

//set 方法的重写
void setName(id self,SEL _cmd,NSString* name)
{

    //保存自己类
    Class myclass=[self class];

    //self指向父类
    object_setClass(self,class_getSuperclass([self class]));

//    struct objc_super sup;
//
//    sup.receiver=myclass;
//
//    sup.super_class=class_getSuperclass([self class]);

    //父类执行方法
    objc_msgSend(self,@selector(setName:),name);

    //获取observer对象
    id objc= objc_getAssociatedObject(self, (__bridge const void*)@"objc");

    //通知observer执行方法
    objc_msgSend(objc, @selector(addObserver:forKeyPath:options:context:),self,name,NSKeyValueObservingOptionNew,nil);

    //self指回来
    object_setClass(self, myclass);

}

*VC中的处理

- (void)viewDidLoad {
    [super viewDidLoad];

    self.pe=[[people alloc]init];

//    self.pe.name=[[NSString alloc]init];

    [self.pe setValue:@"黄龙" forKeyPath:@"name"];

    [self.pe PE_addobserve:self forkeyPath:@"name" options:NSKeyValueObservingOptionNew context:nil];

    UIButton *btn =[UIButton buttonWithType:UIButtonTypeCustom];

    btn.frame=CGRectMake(100,100, 200, 100);

    btn.backgroundColor=[UIColor brownColor];

    [btn addTarget:self action:@selector(btnclick) forControlEvents:UIControlEventTouchUpInside];

    [self.view addSubview:btn];

//    [self addObserver:self forKeyPath:@"name" options:NSKeyValueObservingOptionNew context:nil];


    // Do any additional setup after loading the view, typically from a nib.
}

-(void)btnclick
{
    [e-mail]"小黄狗";
//    [self.pe setValue:@"小黄狗" forKeyPath:@"name"];
}


-(void)addObserver:(NSObject *)observer forKeyPath:(NSString *)keyPath options:(NSKeyValueObservingOptions)options context:(void *)context

{

    NSLog(@"我可能要换个名字了:%@",[self.pe valueForKeyPath:@"name"]);

}

但是当我点击按钮的的时候却爆出内存错误：

我尝试将people中的name的属性改为strong,只是一种尝试

@property(nonatomic,strong)NSString *name;

依然出现内存错误：

第二张图片截图的时候不小心在方法中加了4，报错未实现警告，但是不影响

尝试初始化依然不行

小白有点麻爪求助

附上源码地址 ：源码