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NSString NSError *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。
