1.自定义一个User类,实现NSSecureCoding协议
@interface User : NSObject <NSSecureCoding>
@property(nonatomic, strong)NSString *user;
@property(nonatomic, strong)NSArray *books;
@property(nonatomic, assign)int age;
@end
@implementation User
+(instancetype)model{
User *user = [[User alloc] init];
user.user = @"user";
user.books = @[@"精通Objective-C设计模式",@"图解HTTP",@"解忧杂货店"];
user.age = 24;
return user;
}
+ (BOOL)supportsSecureCoding{
return YES;
}
- (nullable instancetype)initWithCoder:(NSCoder *)aDecoder;{
self = [super init];
if (self) {
self.user = [aDecoder decodeObjectOfClass:[NSString class] forKey:@"user"];
self.books = [aDecoder decodeObjectOfClass:[NSArray class] forKey:@"books"];
self.age = [aDecoder decodeIntForKey:@"age"];
}
return self;
}
- (void)encodeWithCoder:(NSCoder *)aCoder{
[aCoder encodeObject:_user forKey:@"user"];
[aCoder encodeObject:_books forKey:@"books"];
[aCoder encodeInt:_age forKey:@"age"];
}
2.Archive
User *user = [User model];
NSMutableData *data = [NSMutableData data];
NSKeyedArchiver *archive = [[NSKeyedArchiver alloc] initForWritingWithMutableData:data];
archive.requiresSecureCoding = YES;
[archive encodeObject:user forKey:NSKeyedArchiveRootObjectKey];
[archive finishEncoding]; //encode完之后，必须调用此方法
[data writeToFile:[self filePath] atomically:YES];
3.Unarchive
NSData *data = [[NSData alloc] initWithContentsOfFile:[self filePath]];
NSKeyedUnarchiver *unarchive = [[NSKeyedUnarchiver alloc] initForReadingWithData:data];
unarchive.requiresSecureCoding = YES;
User *user = [unarchive decodeObjectOfClass:[User class] forKey:NSKeyedArchiveRootObjectKey];
[unarchive finishDecoding]; //可调用或者可不调用？
