使用序列化和反序列化函数archivedDataWithRootObject和unarchivedObjectOfClasses的使用和遇到问题及解决方案

为何archiveRootObject和unarchiveObjectWithFile正常，而archivedDataWithRootObject和unarchivedObjectOfClasses一直报错。
[NSKeyedArchiver archiveRootObject:account toFile:path];和`c
PPAccountModel *account = [NSKeyedUnarchiver unarchiveObjectWithFile:path];

```c
'archiveRootObject:toFile:' is deprecated: first deprecated in iOS 12.0 - Use +archivedDataWithRootObject:requiringSecureCoding:error: and -writeToURL:options:error: instead

'unarchiveObjectWithFile:' is deprecated: first deprecated in iOS 12.0 - Use +unarchivedObjectOfClass:fromData:error: instead

替换很简单，但是会一堆问题等着你解决，序列化和反序列全失败。
先说能简单解决的序列化（归档）：

    NSString *path = [self PathWithFileName:@"啊啊啊.data"];//拓展名可以自己随便取DYGlobleData.token = @"";PPAccountModel *account = nil;
//    [NSKeyedArchiver archiveRootObject:account toFile:path];NSError *error = nil;NSData *archiveData = [NSKeyedArchiver archivedDataWithRootObject:account requiringSecureCoding:YES error:&error];if (archiveData == nil || error) {NSLog(@"归档失败:%@", error);}BOOL isSuccess = [archiveData writeToFile:path atomically:YES];if(!isSuccess){NSLog(@"归档存储失败:%d", isSuccess);}

简单吧！也不是很复杂。首先失败的提示信息如下：

Error Domain=NSCocoaErrorDomain Code=4866 "未能写入数据，因为它的格式不正确。" UserInfo={NSUnderlyingError=0x2835675a0 {Error Domain=NSCocoaErrorDomain Code=4864 "This decoder will only decode classes that adopt NSSecureCoding. Class 'PPAccountModel' does not adopt it." UserInfo={NSDebugDescription=This decoder will only decode classes that adopt NSSecureCoding. Class 'PPAccountModel' does not adopt it.}}}

这是啥鬼？搞了半天查出来了，是序列化时采用了requiringSecureCoding为YES。但是序列化的类采用的是NSCoding协议，可以设置成NO，这样能序列化成功，但是反序列化就不能保证怎么样了。那就遵循NSSecureCoding协议吧！改造也很简单，在头文件换成NSSecureCoding，在实现文件写上supportsSecureCoding函数具体代码：

@interface PPAccountModel : NSObject<NSCoding>

+ (BOOL)supportsSecureCoding {return YES;
}

遇到空数组序列化失败：

[aCoder encodeObject:[NSMutableArray array] forKey:@"usersAvatar"];

修改为：

    if(isCommonUnitEmptyArray(self.usersAvatar)){[aCoder encodeObject:@"" forKey:@"usersAvatar"];}else{[aCoder encodeObject:self.usersAvatar forKey:@"usersAvatar"];}

也很简单啊！序列化搞定。
反序列化坑更多。序列化成功但是反序列化错误：
反序列化：

//得到用户信息
-(PPAccountModel *)getAccountInfo;
{FLDDLogDebug(@"函数");NSString *path = [self PathWithFileName:@"啊啊啊.data"];//拓展名可以自己随便取
//    PPAccountModel *account = [NSKeyedUnarchiver unarchiveObjectWithFile:path];// NSData转array，转dictionary，转NSStringNSError *err = nil;NSData *archiveData = [NSData dataWithContentsOfFile:path];if(!archiveData){return nil;}PPAccountModel *account = [NSKeyedUnarchiver unarchivedObjectOfClasses:[NSSet setWithArray:@[NSArray.class,NSDictionary.class, NSString.class, UIFont.class, NSMutableArray.class, NSMutableDictionary.class, NSMutableString.class, UIColor.class, NSMutableData.class, NSData.class, NSNull.class, NSValue.class,NSDate.class, XQUserModel.class, NSNumber.class, PPAccountModel.class, XQTimeMapModel.class]] fromData:archiveData error:&err];_account = account;if (archiveData == nil || err) {NSLog(@"反序列化失败:%@", err);}
//    if((account == nil) || (kUserLogin))NSLog(@"account = %@",account);if(account == nil){
//        [[NSUserDefaults standardUserDefaults] setBool:NO forKey:kLoginStateKey];
//        [[NSUserDefaults standardUserDefaults] removeObjectForKey:kLoginToken];
//        [[NSUserDefaults standardUserDefaults] synchronize];self.isLogin = NO;DYGlobleData.token = @"";[BITSingleObject sharedInstance].token = @"";}else{self.isLogin = YES;[BITSingleObject sharedInstance].token = account.token;DYGlobleData.token = account.token;[account fetchRoleData];}return account;
}

首先保证把参与序列化的所有对象类型都列举出来，写少了就4865 错误。但是全部列举万了还是4865错误，错误信息如下：

object c  -[NSKeyedUnarchiver decodeObjectForKey:]:    missing class information for object

到处查资料也没有查到解决方案，我试了半天我快放弃了，才找到原因。因为序列化的用户信息是反序列化后给单例对象了，这个用户信息增加了一些不需要序列化的成员变量，把它当用户相关的单例成员变量了，没有实现序列化和反序列化。我把这些变量去掉或序列化就反序列化正常了。
注意：子类的序列化和反序列化时需要把父类的变量也序列化和反序列化。