のdealloc UILabel

Question

は、これは私のコード

- (UIView *)carousel:(iCarousel *)carousel viewForItemAtIndex:(NSUInteger)index 
{ 
    MWFeedItem *item = [reader.feedItems objectAtIndex:index]; 

    //INIZIALIZZO L'ARRAY CARICANDOLO DAL FILE!!!! 
    //[reader.feedItems initWithContentsOfFile:[[NSDictionary alloc] initWithContentsOfFile:@"Library/NewsPad"]]; 

    //create a numbered view 
    UIView *view = [[[UIImageView alloc] initWithImage:[UIImage imageNamed:@"page_iPhone_Vertical.png"]] autorelease]; 

    CGRect frame = CGRectMake(40, 118, 228, 100); 

    UILabel *labelTitle = [[UILabel alloc] initWithFrame:frame]; 
    labelTitle.backgroundColor = [UIColor clearColor]; 
    labelTitle.textAlignment = UITextAlignmentLeft; 
    labelTitle.font = [UIFont fontWithName:@"Helvetica-Bold" size:12]; 
    labelTitle.numberOfLines=3; 
    [view addSubview:labelTitle]; 

    labelTitle.text = item.title; 

    [view addSubview:labelTitle]; 

    /* DATA 
    RSSEntry *entry = [_allEntries objectAtIndex:index]; 

    NSDateFormatter * dateFormatter = [[[NSDateFormatter alloc] init] autorelease]; 
    [dateFormatter setTimeStyle:NSDateFormatterMediumStyle]; 
    [dateFormatter setDateStyle:NSDateFormatterMediumStyle]; 
    NSString *articleDateString = [dateFormatter stringFromDate:entry.articleDate]; 
    */ 

    NSUserDefaults *settings = [NSUserDefaults standardUserDefaults]; 
    NSInteger loadImage=[settings objectForKey:@"loadImage"]; 

    /******** Get the image **********/ 
    NSString *url = [self getFirstImage:item.summary]; 
    //NSString *url = item.image; 

    if (loadImage != 0 && url != nil) { 
     //Create a managed image view and add it to the cell (layout is very naieve) 

     image = [[EGOImageView alloc] initWithPlaceholderImage:[UIImage imageNamed:@"loading.png"]]; 
     image.frame = CGRectMake(45, 200, 210, 150); 
     [view addSubview:image]; 
     image.imageURL = [NSURL URLWithString:url]; 

     /* OLD!!! 
     HJManagedImageV *image; 
     image = [[[HJManagedImageV alloc] initWithFrame:CGRectMake(45, 200, 210, 150)] autorelease]; 
     image.tag = 999; 

     [view addSubview:image]; 

     //set the URL that we want the managed image view to load 
     image.url = [NSURL URLWithString:url]; 

     //tell the object manager to manage the managed image view, 
     //this causes the cached image to display, or the image to be loaded, cached, and displayed 
     [objMan manage:image]; 
     */ 

     frame= CGRectMake(40, 205, 230, 400); 
     UILabel *desc = [[[UILabel alloc] initWithFrame:frame] autorelease]; 
     desc.numberOfLines=6; 
     desc.backgroundColor = [UIColor clearColor]; 
     //desc.textAlignment = UITextAlignmentCenter; 
     desc.font = [desc.font fontWithSize:12]; 
     [view addSubview:desc]; 
     //SETTO DESCRIPTION 

     //rimuovo tag html 
     NSString *descrizione=[item.summary stringByConvertingHTMLToPlainText]; 
     /* DEBUG 
     NSString *descrizione=item.summary; 

     */ 
     [desc setText:descrizione]; 

     //NSLog(item.summary);  
    } 
    else { 
     frame= CGRectMake(40, 90, 235, 400); 
     UILabel *desc = [[[UILabel alloc] initWithFrame:frame] autorelease]; 
     desc.numberOfLines=15; 
     desc.backgroundColor = [UIColor clearColor]; 
     //desc.textAlignment = UITextAlignmentCenter; 
     desc.font = [desc.font fontWithSize:12]; 
     [view addSubview:desc]; 
     //SETTO DESCRIPTION 
     //rimuovo tag html 
     NSString *descrizione=[item.summary stringByConvertingHTMLToPlainText]; 
     /* DEBUG 
     NSString *descrizione=item.summary; 
     */ 
     [desc setText:descrizione]; 
    } 

    return view; 
} 

なぜ私は自分のコードに[labelTitleリリース]または[降順リリース]アプリのcrashsを追加した場合は？

Answer 1

あなたはその質問に多くのコードを書いています。

labelTitleは表示されているコードからは正常に見えますが、descは自動再生されたオブジェクトです。

UILabel *desc = [[[UILabel alloc] initWithFrame:frame] autorelease]; 

それは+1のカウントを保持しているが、（変数がスコープの外に出る通常、直後に）それが時間内にいくつかの将来の時点でのカウントを保持デクリメントれる自動解放されました。だから、それを解放する理由はありません。

NSAutoReleasePool on apple's docsについて詳しく読むことができます。

あなたはまた、How does the NSAutoreleasePool autorelease pool work?