Runtime-实现NSCoding的自动归档和自动解档#

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- (instancetype)initWithCoder:(NSCoder *)aDecoder{
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    if (self = [super init]) {
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        Class c = self.class;
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        // 截取类和父类的成员变量
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        while (c && c != [NSObject class]) {
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            unsigned int count = 0;
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            Ivar *ivars = class_copyIvarList(c, &count);
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            for (int i = 0; i < count; i++) {
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                NSString *key = [NSString stringWithUTF8String:ivar_getName(ivars[i])];
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                id value = [aDecoder decodeObjectForKey:key];
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                if (value){// 容错
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                     [self setValue:value forKey:key];
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                }
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            }
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            // 获得c的父类
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            c = [c superclass];
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            free(ivars);
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        }
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    }
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    return self;
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}

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- (void)encodeWithCoder:(NSCoder *)aCoder{
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    Class c = self.class;
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    // 截取类和父类的成员变量
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    while (c && c != [NSObject class]) {
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        unsigned int count = 0;
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        Ivar *ivars = class_copyIvarList(c, &count);
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        for (int i = 0; i < count; i++) {
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            Ivar ivar = ivars[i];
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            NSString *key = [NSString stringWithUTF8String:ivar_getName(ivar)];
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            id value = [self valueForKey:key];
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            if (value){
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                 [aCoder encodeObject:value forKey:key];
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             }
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        }
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        c = [c superclass];
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        // 释放内存
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        free(ivars);
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    }
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}