objective-c - 如何在 Mojave 中归档 NSSortDescriptor 数组

Question

我有通过 High Sierra (10.13) 工作的代码，它成功地将排序描述符数组归档和取消归档到 NSData，但现在在 Mojave (10.14) 中不推荐使用操作调用。这是有效的代码：

NSArray<NSSortDescriptor*> *sortSettings = @[[NSSortDescriptor sortDescriptorWithKey:@"title" ascending:NO]];

NSData *sortData = [NSKeyedArchiver archivedDataWithRootObject:sortSettings];
NSArray<NSSortDescriptor*> *unarchivedSettings = [NSKeyedUnarchiver unarchiveObjectWithData:sortData];

// Test case passes
XCTAssertEqualObjects(unarchivedSettings.firstObject.key, @"title");

我尝试使用下面的代码，以及弃用警告建议的调用，但它不起作用。

NSArray<NSSortDescriptor*> *sortSettings = @[[NSSortDescriptor sortDescriptorWithKey:@"title" ascending:NO]];

NSError *archiveError = nil;
NSData *sortData = [NSKeyedArchiver archivedDataWithRootObject:sortSettings
                                         requiringSecureCoding:YES
                                                         error:&archiveError];
// Test cases pass
XCTAssertNotNil(sortData);
XCTAssertNil(archiveError);

NSError *unarchiveError = nil;
NSArray<NSSortDescriptor*> *unarchivedSettings = [NSKeyedUnarchiver unarchivedObjectOfClass:[NSArray class]
                                                                                   fromData:sortData
                                                                                      error:&unarchiveError];
XCTAssertNotNil(unarchivedSettings); // Fails
XCTAssertNil(unarchiveError); // Fails, with error below

归档成功，返回一个 NSData，但 unarchive 调用返回一个错误：

Error Domain=NSCocoaErrorDomain Code=4864 "value for key 'NS.objects' was of unexpected class 'NSSortDescriptor'. Allowed classes are '{( NSArray )}'." UserInfo={NSDebugDescription=value for key 'NS.objects' was of unexpected class 'NSSortDescriptor'. Allowed classes are '{( NSArray )}'.}

Answer 1

您需要列出所有正在归档的类（在本例中为NSArray和NSSortDescriptor）：

[NSKeyedUnarchiver unarchivedObjectOfClasses:[NSSet setWithArray:@[
                                              [NSArray class],
                                              [NSSortDescriptor class]
                                             ]]
                                    fromData:sortData
                                       error:&unarchiveError];