Go to Github to download the source codes.

简要说明

This demo describes two ways to archive or unarchive all of the NSObject objects and its
subclass objects.One way uses Ivar and another uses objc_property_t.
本例子通过objc/runtime，分别使用Ivar和objc_property_t两种方式，实现id对象类型的归解档。

IDE: Mac OS EI Capitan 10.11.4,Xcode 7.3.1 (7D1014)

实现原理

Getting the object’s variable names by runtime,and getting variable value by Key-Value-Coding,
to encode or decode in loop.
通过运行时，循环取出当前对象的变量名，以及KVC通过变量名进行取值赋值，再通过得到的键和值进行归档解档。

Usage

相关的Objc运行时模块： @import ObjectiveC.runtime;
或头文件： #import

Please copy or move the files CommonArchiveModel.h and CommonArchiveModel.m to your project,
then you can use it directly.
使用时，直接引入通用归解档基类CommonArchiveModel到相应工程中即可。

Archive

Create a new Cocoa Class ,which is subclass of CommonArchiveModel,and add properties
and variables to it.Then use the method archiveRootObject:toFile: of NSKeyedArchiver to
archive the model to designated path.
新建CommonArchiveModel子类，在该子类添加相关的属性或实例变量；
把需要归档的子类对象用[NSKeyedArchiver archiveRootObject:toFile:]归档到指定目录下。

objc_property_t Archive Codes

- (void)encodeWithCoder:(NSCoder *)aCoder {
    unsigned int outCount;
    objc_property_t *properties = class_copyPropertyList([self class], &outCount);
    for (int i=0; i<outCount; i++) {
        objc_property_t property = properties[i];
        const char *char_f = property_getName(property);
        //propertyName包含下划线，对此功能并无影响
        NSString *propertyName = [NSString stringWithUTF8String:char_f];
        id propertyValue = [self valueForKey:propertyName];
        if (!propertyName || !propertyValue) {
            continue;
        }
        [aCoder encodeObject:propertyValue forKey:propertyName];
    }
    free(properties);
}

Ivar Archive Codes

- (void)encodeWithCoder:(NSCoder *)aCoder {
    unsigned int outCount, index;
    Ivar *ivars = class_copyIvarList([self class], &outCount);

    for (index = 0; index < outCount; index++) {
        Ivar varName = ivars[index];
        NSString *varKey = [NSString stringWithCString:ivar_getName(varName) encoding:NSUTF8StringEncoding];
        NSLog(@"encode varKey = %@",varKey);

        id varValue = [self valueForKey:varKey];//从当前对象取值
        if (!varKey || !varValue || [[self ignoreVarKeys] containsObject:varKey]) {
            continue;
        }
        [aCoder encodeObject:varValue forKey:varKey];//归档
    }
    free(ivars);
}

Unarchive

Call the class method unarchiveObjectWithFile of NSKeyedUnarchiver to unarchive the object
which was archived before.And the log its values that is used to compare the values before archive.
调用[NSKeyedUnarchiver unarchiveObjectWithFile:]解档一个自定义模型，查看基属性的值是否
和之前归档的一致。

objc_property_t Unarchive Codes

- (instancetype)initWithCoder:(NSCoder *)aDecoder {
    self = [super init];
    if (self) {
        unsigned int outCount;
        objc_property_t *properties = class_copyPropertyList([self class], &outCount);
        for (int i=0; i<outCount; i++) {
            objc_property_t property = properties[i];
            const char *char_f = property_getName(property);
            NSString *propertyName = [NSString stringWithUTF8String:char_f];
            id propertyValue = [aDecoder decodeObjectForKey:propertyName];
            if (!propertyName || !propertyValue) {
                continue;
            }
            [self setValue:propertyValue forKey:propertyName];//此外可扩展，写个接口传进一个字典，把key/value映射到self
        }
        free(properties);
    }
    return self;
}

Ivar Unarchive Codes

- (instancetype)initWithCoder:(NSCoder *)aDecoder {
    self = [super init];
    if (self) {
        unsigned int outCount,index;
        Ivar *ivars = class_copyIvarList([self class], &outCount);
        for (index=0; index<outCount; index++) {
            Ivar varName = ivars[index];
            const char *char_f = ivar_getName(varName);
            NSString *varKey = [NSString stringWithUTF8String:char_f];

            id varValue = [aDecoder decodeObjectForKey:varKey];//解档
            if (!varKey || ! varValue  || [[self ignoreVarKeys] containsObject:varKey]) {
                continue;
            }
            NSLog(@"decode varKey = %@",varKey);
            [self setValue:varValue forKey:varKey];//给当前对象赋值
        }
        free(ivars);
    }
    return self;
}

Please look at the project files from Github to know other details.
其它细节请查看Github工程文件。

编写本博客相关环境：Mac OS EI Capitan 10.11.4，Mou 0.8.7，Xcode 7.3.1 (7D1014)，iOS 9.3.2

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