如何使用iCloud将iPad/iPhone上的NSDocument同步到Mac osx

问题描述

如何同步 ipad /iphone 标签" title =显示已标记"icloud"的问题"" rel ="tag"> icloud

How to Sync an nsdocument from ipad/iphone to Mac osx with icloud

我设法使其正常运行！从Mac osx到iPhone/iPad，但不是从iPad/iPhone到Mac osx

I managed to get it working! from Mac osx to iPhone/iPad but not from iPad/iPhone to Mac osx

这是我的代码，来自子类 nsdocument 文件在osx :

Here's my code from the subclassed nsdocument file on osx:

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:

and in the AppDelegate.m file:

#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
}

问题是:我唯一无法使用的是，如果我在iPad上更改文档的数据，Mac应用程序不会调用readFromData方法从iCloud进行更新，有人知道我丢失了什么吗?

The question is:The only thing that I haven't got working is that if I change the data of the document on the iPad, the Mac app doesn't call the readFromData method for to update from iCloud, does anyone know what I am missing?

在iOS上，iCloud中UIDocument的每次更改都会自动调用等效方法loadFromContents.在OS X上，readFromData在加载时被调用一次，但再也不会被调用.

On iOS, the equivalent method, loadFromContents, is called automatically on every change of the UIDocument in iCloud. On OS X the readFromData is called once on load but never called again.

希望我的代码可以提供帮助，对我来说，这是从Mac到iPad的一种工作方式.

Hope my code can help, for me it is working one way from Mac to iPad.

推荐答案

自己修复.

显然，这只是一个实施不当且过于复杂的示例代码.

Apparently it's just a poorly implemented and over-complicated sample code.

在applicationDidFinishLaunching:上，我们只需要

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

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

并添加以下方法:

- (void)queryUpdated:(NSNotification *)notification {
    NSLog(@"queryUpdated called...");
    NSMetadataQuery *query = [notification object];
    [query disableUpdates];

    if ([query resultCount] == 1) {
        // update views, etc. here
    }

    [query enableUpdates];
}

然后从原始样本中删除所有未调用的方法.

Then remove all the uncalled methods from the original sample.

这篇关于如何使用iCloud将iPad/iPhone上的NSDocument同步到Mac osx的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！