iOS runtime 归档解档

创建Person类

.h文件

#import <Foundation/Foundation.h>

#import <objc/runtime.h>

@interface Person : NSObject<NSCoding>

@property (nonatomic,copy) NSString *name; @end

@end

.m文件

#import "Person.h"

@implementation Person

//编码

- (void)encodeWithCoder:(NSCoder *)aCoder {  

  unsigned int count = 0;    

Ivar * ivars = class_copyIvarList([self class], &count);  

for (int i = 0 ; i< count;i++) {

 Ivar ivar = ivars[i];

  const char *name  = ivar_getName(ivar);    

  NSString *key = [NSString stringWithUTF8String:name];    

  [aCoder encodeObject:[self valueForKey:key] forKey:key];

 }

    free(ivars);

}

//解码

- (id)initWithCoder:(NSCoder *)aDecoder {

 if(self = [super init])     {    

    unsigned int count;    

    // 获得指向当前类的所有属性的指针  

      Ivar * ivars = class_copyIvarList([self class], &count);    

    for (int i = 0; i < count; i++) {        

    // 获取指向当前类的一个属性的指针    

        Ivar ivar = ivars[i];        

    // 获取C字符串的属性名        

    const char *name = ivar_getName(ivar);      

      // C字符串转OC字符串        

    NSString *propertyName = [NSString stringWithUTF8String:name];      

      // 解码属性值        

    NSString *propertyValue = [aDecoder decodeObjectForKey:propertyName];  

          [self setValue:propertyValue forKey:propertyName];    

    }      

  // 记得释放    

    free(ivars);  

  }

         return self;

}

json解析类同理。