如何使用iCloud将Mac OS中的NSDocument与iPad/iPhone同步

Question

我已经看过iOS的iCloud Document示例代码,我用它来同步iCloud 的uidocument,现在我试图在没有的Mac OSX应用程序上同步iCloud和nsdocumentUIDocument.

我试图改变UIDocument,NSDocument但与icloud同步的所有方法都不同.我没有找到任何示例代码或教程,除了苹果的文档,这是非常令人困惑和写得不好.

例如,OS X上UIDocument不存在iOS上的以下方法NSDocument:

//doc is an instance of subclassed UIDocument
[doc openWithCompletionHandler:nil];

Apple文档为OS X提供此代码:

- (void)checkIfCloudAvaliable {
    NSURL *ubiquityContainerURL = [[[NSFileManager defaultManager]
                                    URLForUbiquityContainerIdentifier:nil]
                                   URLByAppendingPathComponent:@"Documents"];
    if (ubiquityContainerURL == nil) {
        NSDictionary *dict = [NSDictionary dictionaryWithObjectsAndKeys:
                              NSLocalizedString(@"iCloud does not appear to be configured.", @""),
                              NSLocalizedFailureReasonErrorKey, nil];
        NSError *error = [NSError errorWithDomain:@"Application" code:404
                                         userInfo:dict];
        [self presentError:error modalForWindow:[self windowForSheet] delegate:nil
        didPresentSelector:NULL contextInfo:NULL];
        return;
    }
    dest = [ubiquityContainerURL URLByAppendingPathComponent:
            [[self fileURL] lastPathComponent]];
}

- (void)moveToOrFromCloud {
    dispatch_queue_t globalQueue =
    dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0);
    dispatch_async(globalQueue, ^(void) {
        NSFileManager *fileManager = [[NSFileManager alloc] init];
        NSError *error = nil;
        // Move the file.
        BOOL success = [fileManager setUbiquitous:YES itemAtURL:[self fileURL]
                                   destinationURL:dest error:&error];
        dispatch_async(dispatch_get_main_queue(), ^(void) {
            if (! success) {
                [self presentError:error modalForWindow:[self windowForSheet]
                          delegate:nil didPresentSelector:NULL contextInfo:NULL];
            }
        });
    });
    [self setFileURL:dest];
    [self setFileModificationDate:nil];
}

如何在iOS和OS X之间进行同步(因为NSDocumentiOS UIDocument上不存在,OS X上不存在)？有谁知道我在哪里可以找到Mac OSX的样本(NSDocument同步)？

Answer 1

我设法让它工作!这是我在OS X上的子类nsdocument文件中的代码:

头文件:

#import <Cocoa/Cocoa.h>
#import <Foundation/Foundation.h>

@interface subclassedNSDocument : NSDocument

@property (strong) NSData *myData;

@end

实施文件:

- (BOOL)readFromData:(NSData *)data ofType:(NSString *)typeName error:(NSError **)outError 
{
    BOOL readSuccess = NO;
    if (data) 
    {
        readSuccess = YES;
        [self setMyData:data];
    }

    [[NSNotificationCenter defaultCenter] postNotificationName:@"dataModified" 
                                                        object:self];

    return readSuccess;
}

- (NSData *)dataOfType:(NSString *)typeName error:(NSError **)outError 
{
    if (!myData && outError) {
        *outError = [NSError errorWithDomain:NSCocoaErrorDomain
                                        code:NSFileWriteUnknownError userInfo:nil];
    }
    return myData;
}

并在AppDelegate.m文件中:

#define kFILENAME @"mydocument.dox"

- (void)applicationDidFinishLaunching:(NSNotification *)aNotification
{
    NSURL *ubiq = [[NSFileManager defaultManager] 
                   URLForUbiquityContainerIdentifier:nil];
    if (ubiq) {
        NSLog(@"iCloud access at %@", ubiq);
        // TODO: Load document... 
        [self loadDocument];
    }
    else 
    {
        NSLog(@"No iCloud access");
    }

    [[NSNotificationCenter defaultCenter] addObserver:self 
                                             selector:@selector(dataReloaded:) 
                                                 name:@"dataModified" object:nil];
}

- (void)update_iCloud
{
    NSURL *ubiq = [[NSFileManager defaultManager] URLForUbiquityContainerIdentifier:nil];
    NSURL *ubiquitousPackage = [[ubiq URLByAppendingPathComponent:@"Documents"] URLByAppendingPathComponent:kFILENAME];
    self.doc.myData = [NSKeyedArchiver archivedDataWithRootObject:[@"Your Data Array or any data", nil]];
    [self.doc saveToURL:ubiquitousPackage ofType:@"dox" forSaveOperation:NSSaveOperation error:nil];
}

- (void)loadData:(NSMetadataQuery *)query {

    if ([query resultCount] == 1) {

        NSMetadataItem *item = [query resultAtIndex:0];
        NSURL *url = [item valueForAttribute:NSMetadataItemURLKey];
        NSLog(@"url = %@",url);
        subclassedNSDocument *doc = [[subclassedNSDocument alloc] initWithContentsOfURL:url ofType:@"dox" error:nil];
        [doc setFileURL:url];
        self.doc = doc;
    } 
    else {

        NSURL *ubiq = [[NSFileManager defaultManager] URLForUbiquityContainerIdentifier:nil];
        NSURL *ubiquitousPackage = [[ubiq URLByAppendingPathComponent:@"Documents"] URLByAppendingPathComponent:kFILENAME];

        dataUrls *doc = [[dataUrls alloc] init];
        [self.doc setFileURL:ubiquitousPackage];
        self.doc = doc;
        [self.doc saveToURL:ubiquitousPackage ofType:@"dox" forSaveOperation:NSSaveOperation error:nil];
    }

}

- (void)queryDidFinishGathering:(NSNotification *)notification {

    NSMetadataQuery *query = [notification object];
    [query disableUpdates];
    [query stopQuery];

    [[NSNotificationCenter defaultCenter] removeObserver:self 
                                                    name:NSMetadataQueryDidFinishGatheringNotification
                                                  object:query];

    _query = nil;

    [self loadData:query];

}

- (void)loadDocument {

    NSMetadataQuery *query = [[NSMetadataQuery alloc] init];
    _query = query;
    [query setSearchScopes:[NSArray arrayWithObject:NSMetadataQueryUbiquitousDocumentsScope]];
    NSPredicate *pred = [NSPredicate predicateWithFormat: @"%K == %@", NSMetadataItemFSNameKey, kFILENAME];
    [query setPredicate:pred];
    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(queryDidFinishGathering:) name:NSMetadataQueryDidFinishGatheringNotification object:query];

    [query startQuery];

}

- (void)dataReloaded:(NSNotification *)notification 
{
    self.doc = notification.object;

    NSArray *arrFromCloud = [NSKeyedUnarchiver unarchiveObjectWithData:self.doc.myData];

    //Update you UI with new data
}

我唯一没有工作的是,如果我在iPad上更改文档的数据,Mac应用程序不会调用readFromData从iCloud更新的方法,有人知道我缺少什么吗？

在iOS上,等效方法在iCloud的loadFromContents每次更改时自动调用UIDocument.在OS X readFromData上,在加载时调用一次,但从未再次调用.

希望我的代码可以提供帮助,对我而言,它是从Mac到iPad的一种方式.