UIDocument永远不会调用dealloc

Question

我有一个问题,我似乎无法dealloc UIDocument(在iCloud中使用)

运行NSMetaDataQuery后查找文件如下..

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];

我处理我的查询

- (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];

}

然后加载或创建一个新文档.

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

if ([query resultCount] == 1) {

    NSMetadataItem *item = [query resultAtIndex:0];
    NSURL *url = [item valueForAttribute:NSMetadataItemURLKey];
    MyDocument *doc = [[[MyDocument alloc] initWithFileURL:url] autorelease];

    [doc openWithCompletionHandler:^(BOOL success) {
        if (success) {                
            NSLog(@"iCloud document opened %@", doc);
            [doc updateChangeCount:UIDocumentChangeDone];
        } else {                
            NSLog(@"failed opening document from iCloud");                
        }
    }];
} else {

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

    MyDocument *doc = [[[MyDocument alloc] initWithFileURL:ubiquitousPackage] autorelease];

    [doc saveToURL:[doc fileURL] 
  forSaveOperation:UIDocumentSaveForCreating 
 completionHandler:^(BOOL success) {            
     if (success) {
         [doc openWithCompletionHandler:^(BOOL success) {                
             NSLog(@"new document opened from iCloud");
             [doc updateChangeCount:UIDocumentChangeDone];
         }];                
     }
 }];
}
}

在NSLog(@"iCloud document opened %@", doc);示出了不同的存储器地址为每个UIDocument.

我的UIDocument子类中有一个NSLog,它永远不会被调用.我无法看到它被保留在哪里,我没有释放它.每当我想要同步我的云数据时,就会运行此查询,这种情况经常发生.数据正确同步.

我遇到了奇怪的崩溃,我的应用程序只是靠近仪表板,调试中没有任何东西(从以前的经验我知道这经常是应用程序消耗太多内存并被终止.)

我认为我的UIDocument正在泄漏,我在这个假设中是否正确,这是我第一次与iCloud搏斗,所以我仍然在一些事情的黑暗中.

我的子类具有以下属性:

@property (copy, nonatomic) NSData *infoData;
@property (copy, nonatomic) NSMutableArray *firstArray;
@property (copy, nonatomic) NSMutableArray *secondArray;
@property (copy, nonatomic) NSMutableArray *thirdArray;

我没有使用ARC.

Answer 1

我没有意识到我必须这样做:

        [doc updateChangeCount:UIDocumentChangeDone];
        [doc closeWithCompletionHandler:nil];

显然,如果一个文件是开放的,那么允许它被解除分配是不明智的!

卫生署!希望这能在将来节省一些时间.