ios12+ NSKeyedUnarchiver使用

1. model.h 实现协议

@interface UserModel : NSObject
.....
@end

2. model.m 配合MJExtension实现coding,最重要的 多写一个支持NSSecureCoding

@implementation UserModel
MJCodingImplementation
///ios11+必须实现
+(BOOL)supportsSecureCoding{
    return YES;
}
@end

3. 使用

///存
NSData *data = [NSKeyedArchiver archivedDataWithRootObject:user requiringSecureCoding:YES error:nil];
///取
[NSKeyedUnarchiver unarchivedObjectOfClass:[UserModel class] fromData:data error:&err];