ios - uitableview 更新错误
<p><p>我使用以下方法更新表格 View 单元格:</p>
<pre><code>
- (void)imageDownloader:(SDWebImageDownloader *)downloader didFinishWithIndexPath:(NSIndexPath *)indexPath
{
NSArray *arr = ;
if ()
{
UITableViewCell *cell = ;//received error here
UIImageView *imageView = (UIImageView *);
SDWebImageManager *manager = ;
UIImage *image = ;
imageView.image = image;
}
}
</code></pre>
<p>这是 <code>SDWebImageDownloader</code> 的委托(delegate)，更新时收到错误:</p>
<pre>thread9:Program received signal: "SIGABRT".
</pre>
<p>Form the device console, there is:</p>
<pre>: *** Terminating app due to uncaught exception 'NSRangeException', reason: '*** -: index 7 beyond bounds '
*** First throw call stack:
(0x335a38bf 0x300971e5 0x334ecb6b 0x30ff0eb1 0xaa0a7 0x334fd435 0xb5b13 0x30d91a91 0x30e255a1 0x36fa0c1d 0x36fa0ad8)
</pre>
<p>Then I print the <code>arr</code> which holds the current visible index path:</p>
<pre>Printing description of arr:
(
" 2 indexes ",
" 2 indexes ",
" 2 indexes ",
" 2 indexes ",
" 2 indexes ",
" 2 indexes ",
" 2 indexes "
)
</pre>
<p>and the received <code>indexPath</code></p>
<pre> 2 indexes
</pre>
<p>The indexPath is included in the visible index path, and why it still cause the <code>NSRangeException</code>?
It looks like a bug for <code>cellForRowAtIndexPath:indexPath</code>, as the row of index path is 7 which is beyond the visible index path arr, am I right?</p>
<p>Add the eatableview delegate method:</p>
<pre><code>
- (UITableViewCell *)tableView:(UITableView *)inTableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
static NSString *CellIdentifier = @"Cell";
NSString *path;
NSString *filename;
BOOL download = YES;
NSDictionary *tempDic = nil;
@synchronized (documentDirectoryFileList) {
tempDic = ;
filename = ;
NSURL *url = ;
if ( url ) {
path = [ url path ];
download= [ self downloadedFile:url ];
} else {
path = ;
}
}
BOOL isDirectory = FALSE;
NSFileManager *fileManager = [ init];
BOOL found = ;
UITableViewCell *cell = ;
if (cell == nil) {
cell = [[ initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier] autorelease];
CGRect rect;
rect = CGRectMake(5,14, 32, 32);
cell.userInteractionEnabled = YES;
UIImageView *imageView = [ initWithFrame:rect];
imageView.tag = 'ICON';
;
;
rect = CGRectMake(42, 10, 238, 22);
UILabel *labelView = [ initWithFrame:rect];
labelView.tag = 'NAME';
labelView.font = ;
if ( download == NO )
labelView.textColor = ;
;
;
rect = CGRectMake(42, 34, 200, 20);
labelView = [ initWithFrame:rect];
labelView.tag = 'TIME';
labelView.font = ;
if ( download == NO )
labelView.textColor = ;
;
;
rect = CGRectMake(200, 34, 75, 20);
labelView = [ initWithFrame:rect];
labelView.tag = 'SIZE';
labelView.font = ;
if ( download == NO )
labelView.textColor = ;
labelView.textAlignment = UITextAlignmentRight;
;
;
}
// Get the time zone wrapper for the row
UIImageView *imageView = (UIImageView *);
imageView.image = NULL;
NSString* extension = [ lowercaseString];
if ( ||
||
||
||
||
||
)
{
NSString *realFilePath = [ fileManager destinationOfSymbolicLinkAtPath:path error:nil ];
if ( realFilePath )
path = realFilePath;
NSURL *url = [ URLByAppendingPathComponent:@"thumb.th"];
SDWebImageManager *manager = ;
UIImage *temp = ;
if (temp) {
imageView.image = temp;
}
else
{
SDWebImageDownloader *downloader = ;
}
} else {
imageView.image = [ self determineFileIcon : path ];
}
// Configure the cell.
UILabel *labelView = (UILabel *);
labelView.text = filename;
cell.accessoryType = UITableViewCellAccessoryDetailDisclosureButton;
if ( isDirectory ) {
if ( isLink( path ) )
labelView.font = ;
else
labelView.font = ;
} else {
if ( isLink( path ) )
labelView.font = ;
else
labelView.font = ;
}
labelView = (UILabel *);
NSCalendar *theCalendar= [ initWithCalendarIdentifier:NSGregorianCalendar];
NSCalendarUnit unitFlags = NSYearCalendarUnit | NSMonthCalendarUnit |NSDayCalendarUnit | NSHourCalendarUnit | NSMinuteCalendarUnit | NSSecondCalendarUnit;
NSDate *date = ;
NSDateComponents *dateComponents = ;
NSInteger year = ;
NSInteger month = ;
NSInteger day = ;
NSInteger hour = ;
NSInteger minute = ;
NSInteger second = ;
;
labelView.text = ;
if ( !isDirectory ) {
labelView = (UILabel *);
;
NSNumber *size = ;
float value = [ size floatValue ];
NSString *str;
if ( value > ( 1024*1024 ) ) {
value = value / 1024 / 1024;
str = ;
} else if ( value > 1024 ) {
value = value / 1024;
str = ;
} else {
str = ];
}
labelView.text = str;
}
else
{
labelView = (UILabel *);
;
}
;
return cell;
}
</code></pre>
<p>添加于 11-17:
当“SIGABRT”收到时，<code>documentDirectoryFileList</code> 有对象，例如 30+。接收到的 indexPath 存在于可见索引路径数组中。但我注意到:滚动表格 View 时很容易发生。没有新对象添加到数据源。我所做的只是更新单元格上的图像。</p>
<p>我猜可能是:
当接收到的索引路径开始更新相应的单元格时，我碰巧滚动它并且单元格或索引路径不再可见。然后它崩溃了。 </p></p>
<br><hr><h1><strong>Best Answer-推荐答案</ strong></h1><br>
<p><p>这似乎是多线程的一种问题。</p>
<pre><code>
- (void)imageDownloader:(SDWebImageDownloader *)downloader didFinishWithIndexPath:(NSIndexPath *)indexPath
{
@synchronized(tableView)
{
NSArray *arr = ;
if ()
{
UITableViewCell *cell = ;
if (!cell)
{
return;
}
UIImageView *imageView = (UIImageView *);
SDWebImageManager *manager = ;
UIImage *image = ;
if (image) {
dispatch_async(dispatch_get_main_queue(), ^{
imageView.image = image;
});
}
}
}
}
</code></pre>
<p>或者你可以</p>
<pre><code>
- (void)imageDownloader:(SDWebImageDownloader *)downloader didFinishWithIndexPath:(NSIndexPath *)indexPath
{
@synchronized(tableView)
{
NSArray *arr = ;
if ()
{
dispatch_async(dispatch_get_main_queue(), ^{
withRowAnimation:UITableViewRowAnimationNone];
});//must be in main thread; reloadRowsAtIndexPaths: is not thread safe
}
}
}
</code></pre></p>
<p style="font-size: 20px;">关于ios - uitableview 更新错误，我们在Stack Overflow上找到一个类似的问题：
<a href="https://stackoverflow.com/questions/8148811/" rel="noreferrer noopener nofollow" style="color: red;">
https://stackoverflow.com/questions/8148811/
</a>
</p>
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