2
我使用下面的方法更新表視圖細胞：UITableView的更新錯誤
- (void)imageDownloader:(SDWebImageDownloader *)downloader didFinishWithIndexPath:(NSIndexPath *)indexPath
{
NSArray *arr = [self.tableView indexPathsForVisibleRows];
if ([arr containsObject:indexPath])
{
UITableViewCell *cell = [self.tableView cellForRowAtIndexPath:indexPath];//received error here
UIImageView *imageView = (UIImageView *)[cell viewWithTag:'ICON'];
SDWebImageManager *manager = [SDWebImageManager sharedManager];
UIImage *image = [manager imageWithURL:downloader.url];
imageView.image = image;
}
}
這是SDWebImageDownloader委託接收的錯誤時更新：
thread9: Program received signal: "SIGABRT".
形成該裝置控制檯，有：
: *** Terminating app due to uncaught exception 'NSRangeException', reason: '*** -[__NSArrayM objectAtIndex:]: index 7 beyond bounds [0 .. 6]'
*** First throw call stack:
(0x335a38bf 0x300971e5 0x334ecb6b 0x30ff0eb1 0xaa0a7 0x334fd435 0xb5b13 0x30d91a91 0x30e255a1 0x36fa0c1d 0x36fa0ad8)
然後我打印arr它包含當前可見索引路徑：
Printing description of arr:
(
" 2 indexes [0, 1]",
" 2 indexes [0, 2]",
" 2 indexes [0, 3]",
" 2 indexes [0, 4]",
" 2 indexes [0, 5]",
" 2 indexes [0, 6]",
" 2 indexes [0, 7]"
)
和接收indexPath
2 indexes [0, 7]
的indexPath包括在可見的索引路徑，以及爲什麼它仍然會造成NSRangeException？ 它看起來像cellForRowAtIndexPath:indexPath的錯誤，因爲索引路徑的行是7，超出了可見的索引路徑arr，對嗎？
添加eatableview委託方法：在11-17
- (UITableViewCell *)tableView:(UITableView *)inTableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
static NSString *CellIdentifier = @"Cell";
NSString *path;
NSString *filename;
BOOL download = YES;
NSDictionary *tempDic = nil;
@synchronized (documentDirectoryFileList) {
tempDic = [self.documentDirectoryFileList objectAtIndex:indexPath.row];
filename = [tempDic objectForKey:@"filename" ];
NSURL *url = [tempDic objectForKey:@"url" ];
if (url) {
path = [ url path ];
download= [ self downloadedFile:url ];
} else {
path = [tempDic objectForKey:@"filepath" ];
}
}
BOOL isDirectory = FALSE;
NSFileManager *fileManager = [[NSFileManager alloc] init];
BOOL found = [fileManager fileExistsAtPath: path isDirectory: &isDirectory];
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
if (cell == nil) {
cell = [[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier] autorelease];
CGRect rect;
rect = CGRectMake(5,14, 32, 32);
cell.userInteractionEnabled = YES;
UIImageView *imageView = [[UIImageView alloc] initWithFrame:rect];
imageView.tag = 'ICON';
[cell.contentView addSubview:imageView];
[imageView release];
rect = CGRectMake(42, 10, 238, 22);
UILabel *labelView = [[UILabel alloc] initWithFrame:rect];
labelView.tag = 'NAME';
labelView.font = [UIFont boldSystemFontOfSize:18];
if (download == NO)
labelView.textColor = [UIColor lightGrayColor ];
[cell.contentView addSubview:labelView];
[labelView release];
rect = CGRectMake(42, 34, 200, 20);
labelView = [[UILabel alloc] initWithFrame:rect];
labelView.tag = 'TIME';
labelView.font = [UIFont systemFontOfSize:12];
if (download == NO)
labelView.textColor = [UIColor lightGrayColor ];
[cell.contentView addSubview:labelView];
[labelView release];
rect = CGRectMake(200, 34, 75, 20);
labelView = [[UILabel alloc] initWithFrame:rect];
labelView.tag = 'SIZE';
labelView.font = [UIFont systemFontOfSize:12];
if (download == NO)
labelView.textColor = [UIColor lightGrayColor ];
labelView.textAlignment = UITextAlignmentRight;
[cell.contentView addSubview:labelView];
[labelView release];
}
// Get the time zone wrapper for the row
UIImageView *imageView = (UIImageView *)[cell viewWithTag:'ICON'];
imageView.image = NULL;
NSString* extension = [[path pathExtension] lowercaseString];
if ([extension isEqualToString: @"png"] ||
[extension isEqualToString: @"jpg"] ||
[extension isEqualToString: @"jpeg"] ||
[extension isEqualToString: @"bmp"] ||
[extension isEqualToString: @"gif"] ||
[extension isEqualToString: @"tiff"] ||
[extension isEqualToString: @"thm"])
{
NSString *realFilePath = [ fileManager destinationOfSymbolicLinkAtPath:path error:nil ];
if (realFilePath)
path = realFilePath;
NSURL *url = [[NSURL fileURLWithPath:path] URLByAppendingPathComponent:@"thumb.th"];
SDWebImageManager *manager = [SDWebImageManager sharedManager];
UIImage *temp = [manager imageWithURL:url];
if (temp) {
imageView.image = temp;
}
else
{
SDWebImageDownloader *downloader = [SDWebImageDownloader downloaderWithURL:url delegate:self indexPath:indexPath];
}
} else {
imageView.image = [ self determineFileIcon : path ];
}
// Configure the cell.
UILabel *labelView = (UILabel *)[cell viewWithTag:'NAME'];
labelView.text = filename;
cell.accessoryType = UITableViewCellAccessoryDetailDisclosureButton;
if (isDirectory) {
if (isLink(path))
labelView.font = [UIFont italicSystemFontOfSize:16.0];
else
labelView.font = [UIFont boldSystemFontOfSize:16.0];
} else {
if (isLink(path))
labelView.font = [UIFont italicSystemFontOfSize:16.0];
else
labelView.font = [UIFont systemFontOfSize:16.0];
}
labelView = (UILabel *)[cell viewWithTag:'TIME'];
NSCalendar *theCalendar= [[NSCalendar alloc] initWithCalendarIdentifier:NSGregorianCalendar];
NSCalendarUnit unitFlags = NSYearCalendarUnit | NSMonthCalendarUnit | NSDayCalendarUnit | NSHourCalendarUnit | NSMinuteCalendarUnit | NSSecondCalendarUnit;
NSDate *date = [tempDic objectForKey:@"date" ];
NSDateComponents *dateComponents = [theCalendar components:unitFlags fromDate:date];
NSInteger year = [dateComponents year];
NSInteger month = [dateComponents month];
NSInteger day = [dateComponents day];
NSInteger hour = [dateComponents hour];
NSInteger minute = [dateComponents minute];
NSInteger second = [dateComponents second];
[theCalendar release];
labelView.text = [NSString stringWithFormat:@"%d/%02d/%02d %02d:%02d:%02d", year,month,day,hour,minute,second ];
if (!isDirectory) {
labelView = (UILabel *)[cell viewWithTag:'SIZE'];
[labelView setHidden:NO];
NSNumber *size = [tempDic objectForKey:@"filesize" ];
float value = [ size floatValue ];
NSString *str;
if (value > (1024*1024)) {
value = value/1024/1024;
str = [NSString stringWithFormat:@"%0.1f MB", value ];
} else if (value > 1024) {
value = value/1024;
str = [NSString stringWithFormat:@"%0.1f KB", value ];
} else {
str = [NSString stringWithFormat:@"%d Bytes", [ size integerValue ] ];
}
labelView.text = str;
}
else
{
labelView = (UILabel *)[cell viewWithTag:'SIZE'];
[labelView setHidden:YES];
}
[fileManager release];
return cell;
}
加了： 當 「SIGABRT」 接收，所述documentDirectoryFileList有物體，例如30+。收到的indexPath存在於可見索引路徑數組中。但我注意到：當我滾動tableview時很容易發生。沒有新的對象添加到數據源。我所做的只是更新單元格上的圖像。
我想它可能是： 當收到的索引路徑開始更新相應的單元格時，我恰好滾動它並且單元格或索引路徑不再可見。然後它崩潰。
是的，你是對的。發佈你的'cellForRowAtIndexPath：indexPath'。我們將檢查它 – Nekto
你在 返回什麼' - （NSInteger）tableView：（UITableView *）tableView numberOfRowsInSection：（NSInteger）section'？ –
@ Nekto，謝謝。我補充說。 – scorpiozj