runtime序列化&反序列化

//引入头文件#import <objc/message.h>

/* 实现步骤 - 动态获取成员变量 - 便利所有成员变量 - 动态获取成员变量名称作为key - 利用KVC获取或者设置value - 归档 - 释放 */

//告诉系统,归档哪些属性- (void)encodeWithCoder:(NSCoder *)coder{    //利用runtime 来归档!!    unsigned int count = 0;    //count 需要改变所以传入&count c的常识    //ivars 类似数组 不会越界    Ivar * ivars = class_copyIvarList([self class], &count);    for (int i = 0; i < count; i++) {        //获取属性名作为key        Ivar ivar = ivars[i];        const char * name = ivar_getName(ivar);        NSString * key = [NSString stringWithUTF8String:name];        //获取value        id value = [self valueForKey:key];        //存入归档文件        [coder encodeObject:value forKey:key];    }    //C语言里面!! 一旦遇到了copy creat new 需要释放    free(ivars);}

//解档- (instancetype)initWithCoder:(NSCoder *)coder{    self = [super init];    if (self) {        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];            //解档            id value = [coder decodeObjectForKey:key];            //通过KVC 设置            [self setValue:value forKey:key];        }        free(ivars);    }    return self;}