滚动后，UITableView自定义单元格图像消失。 [英] UITableView custom cell images disappear after scrolling.
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问题描述
我正在创建我的开放网格视图。
我创建了一个如下所示的自定义单元格：
我会像这样处理它：
- （UITableViewCell *）tableView：（UITableView *）tableView cellForRowAtIndexPath：（NSIndexPath *）indexPath {
static NSString * MyIdentifier = @Cell;
TableGalleryCustomCell * cell =（TableGalleryCustomCell *）[tableView dequeueReusableCellWithIdentifier：MyIdentifier];
if（cell == nil）{
NSArray * topLevelObjects = [[NSBundle mainBundle] loadNibNamed：@TableGalleryCustomCellowner：nil options：nil];
for（id currentObject in topLevelObjects）{
if（[currentObject isKindOfClass：[UITableViewCell class]]）{
cell =（TableGalleryCustomCell *）currentObject;
休息;
$ b if（countingIndex< [[[self.appDelegate rssParser] rssItems] count]）{
cell.firstAddress。 text = [[[[self.appDelegate rssParser] rssItems] objectAtIndex：countingIndex] Address];
cell.firstPrice.text = [[[[self.appDelegate rssParser] rssItems] objectAtIndex：countingIndex] Deposit];
if（[[[[[[self appDelegate] rssParser] rssItems] objectAtIndex：countingIndex] imageURLs] count]！= 0）{
[cell.firstImage setImageWithURL：[NSURL URLWithString：[[[[ [self.appDelegate rssParser] rssItems] objectAtIndex：countingIndex] imageURLs] objectAtIndex：0.0]]];
cell.firstImage.tag = countingIndex;
}
}
countingIndex ++;
if（countingIndex< [[[self.appDelegate rssParser] rssItems] count]）{
cell.secondAddress.text = [[[[self.appDelegate rssParser] rssItems] objectAtIndex：countingIndex] Address] ;
cell.secondPrice.text = [[[[self.appDelegate rssParser] rssItems] objectAtIndex：countingIndex] Deposit];
if（[[[[[[self appDelegate] rssParser] rssItems] objectAtIndex：countingIndex] imageURLs] count]！= 0）{
[cell.secondImage setImageWithURL：[NSURL URLWithString：[[[[ [self.appDelegate rssParser] rssItems] objectAtIndex：countingIndex] imageURLs] objectAtIndex：0.0]]];
cell.secondImage.tag = countingIndex;
}
}
countingIndex ++;
if（countingIndex< [[[self.appDelegate rssParser] rssItems] count]）{
cell.thirdAddress.text = [[[[[self.appDelegate rssParser] rssItems] objectAtIndex：countingIndex] Address] ;
cell.thirdPrice.text = [[[[self.appDelegate rssParser] rssItems] objectAtIndex：countingIndex] Deposit];
if（[[[[[[self appDelegate] rssParser] rssItems] objectAtIndex：countingIndex] imageURLs] count]！= 0）{
[cell.thirdImage setImageWithURL：[NSURL URLWithString：[[[[ [self.appDelegate rssParser] rssItems] objectAtIndex：countingIndex] imageURLs] objectAtIndex：0.0]]];
cell.thirdImage.tag = countingIndex;
}
}
countingIndex ++;
if（countingIndex< [[[self.appDelegate rssParser] rssItems] count]）{
cell.fourthAddress.text = [[[[self.appDelegate rssParser] rssItems] objectAtIndex：countingIndex] Address] ;
cell.fourthPrice.text = [[[[self.appDelegate rssParser] rssItems] objectAtIndex：countingIndex] Deposit];
if（[[[[[[self appDelegate] rssParser] rssItems] objectAtIndex：countingIndex] imageURLs] count]！= 0）{
[cell.fourthImage setImageWithURL：[NSURL URLWithString：[[[[ [self.appDelegate rssParser] rssItems] objectAtIndex：countingIndex] imageURLs] objectAtIndex：0.0]]];
cell.fourthImage.tag = countingIndex;
}
}
countingIndex ++;
return cell;
$ b $ p
$ b 这有点麻烦，但它的工作.....直到我滚动。图像加载后，滚动屏幕图像消失。
我认为这可能是由于单元格的imageViews丢失了？
我尝试了完全相同的实现，但在每个单元中只有1个imageView，并且所有的工作都很好。
正确的方向任何一点都会非常感谢。
感谢您的宝贵时间。
解决方案我相信问题是因为您的单元正在出列，并且您正在填充 tableView中的单元格： cellForRowAtIndexPath：使用indexPath.row以外的行信息。 可能会尝试以下几行：
（UITableViewCell *）tableView：（UITableView *）tableView cellForRowAtIndexPath：（NSIndexPath *）indexPath
{
NSArray * rssItems;
id rssItem;
static NSString * MyIdentifier = @Cell;
TableGalleryCustomCell * cell =（TableGalleryCustomCell *）[tableView dequeueReusableCellWithIdentifier：MyIdentifier];
if（cell == nil）{
NSArray * topLevelObjects = [[NSBundle mainBundle] loadNibNamed：@TableGalleryCustomCellowner：nil options：nil];
for（id currentObject in topLevelObjects）{
if（[currentObject isKindOfClass：[UITableViewCell class]]）{
cell =（TableGalleryCustomCell *）currentObject;
休息;
}
}
}
rssItems = [[self.appDelegate rssParser] rssItems];
if（indexPath.row< [rssItems count]）{
rssItem = [rssItems objectAtIndex：indexPath.row];
cell.firstAddress.text = [rssItem Address];
cell.firstPrice.text = [rssItem Deposit];
if（[[rssItem imageURLs] count]！= 0）{
[cell.firstImage setImageWithURL：[NSURL URLWithString：[[rssItem imageURLs] objectAtIndex：0.0]]];
cell.firstImage.tag = indexPath.row;
}
}
return cell;
}
I am in the process of creating my open grid view.
I created a custom cell that looks like so:
I handle populating it like so:
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
static NSString *MyIdentifier = @"Cell";
TableGalleryCustomCell *cell = (TableGalleryCustomCell*)[tableView dequeueReusableCellWithIdentifier:MyIdentifier];
if( cell == nil) {
NSArray *topLevelObjects = [[NSBundle mainBundle] loadNibNamed:@"TableGalleryCustomCell" owner:nil options:nil];
for (id currentObject in topLevelObjects) {
if ([currentObject isKindOfClass:[UITableViewCell class]]) {
cell = (TableGalleryCustomCell*)currentObject;
break;
}
}
}
if (countingIndex < [[[self.appDelegate rssParser] rssItems] count]) {
cell.firstAddress.text = [[[[self.appDelegate rssParser] rssItems] objectAtIndex:countingIndex] Address];
cell.firstPrice.text = [[[[self.appDelegate rssParser] rssItems] objectAtIndex:countingIndex] Deposit];
if ([[[[[[self appDelegate] rssParser]rssItems]objectAtIndex:countingIndex] imageURLs] count] != 0 ) {
[cell.firstImage setImageWithURL:[NSURL URLWithString:[[[[[self.appDelegate rssParser] rssItems] objectAtIndex:countingIndex] imageURLs] objectAtIndex:0.0]]];
cell.firstImage.tag = countingIndex;
}
}
countingIndex++;
if (countingIndex < [[[self.appDelegate rssParser] rssItems] count]) {
cell.secondAddress.text = [[[[self.appDelegate rssParser] rssItems] objectAtIndex:countingIndex] Address];
cell.secondPrice.text = [[[[self.appDelegate rssParser] rssItems] objectAtIndex:countingIndex] Deposit];
if ([[[[[[self appDelegate] rssParser]rssItems]objectAtIndex:countingIndex] imageURLs] count] != 0 ) {
[cell.secondImage setImageWithURL:[NSURL URLWithString:[[[[[self.appDelegate rssParser] rssItems] objectAtIndex:countingIndex] imageURLs] objectAtIndex:0.0]]];
cell.secondImage.tag = countingIndex;
}
}
countingIndex++;
if (countingIndex < [[[self.appDelegate rssParser] rssItems] count]) {
cell.thirdAddress.text = [[[[self.appDelegate rssParser] rssItems] objectAtIndex:countingIndex] Address];
cell.thirdPrice.text = [[[[self.appDelegate rssParser] rssItems] objectAtIndex:countingIndex] Deposit];
if ([[[[[[self appDelegate] rssParser]rssItems]objectAtIndex:countingIndex] imageURLs] count] != 0 ) {
[cell.thirdImage setImageWithURL:[NSURL URLWithString:[[[[[self.appDelegate rssParser] rssItems] objectAtIndex:countingIndex] imageURLs] objectAtIndex:0.0]]];
cell.thirdImage.tag = countingIndex;
}
}
countingIndex++;
if (countingIndex < [[[self.appDelegate rssParser] rssItems] count]) {
cell.fourthAddress.text = [[[[self.appDelegate rssParser] rssItems] objectAtIndex:countingIndex] Address];
cell.fourthPrice.text = [[[[self.appDelegate rssParser] rssItems] objectAtIndex:countingIndex] Deposit];
if ([[[[[[self appDelegate] rssParser]rssItems]objectAtIndex:countingIndex] imageURLs] count] != 0 ) {
[cell.fourthImage setImageWithURL:[NSURL URLWithString:[[[[[self.appDelegate rssParser] rssItems] objectAtIndex:countingIndex] imageURLs] objectAtIndex:0.0]]];
cell.fourthImage.tag = countingIndex;
}
}
countingIndex++;
return cell;
}
It is a bit messy but it works.....until I scroll. After the image is loaded then scrolled off the screen the image disappears.
I believe that it maybe due to the imageViews of the cells being lost?
I tried the exact same implementation but with only 1 imageView in each cell and all works great.
Any point in the right direction would be very much appreciated.
I appreciate any help and thank you for your time.
解决方案 I believe the problem is because your cells are being dequeued and you are populating cells in tableView:cellForRowAtIndexPath: using row information other than the indexPath.row.
Maybe try something along the following lines:
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
NSArray * rssItems;
id rssItem;
static NSString * MyIdentifier = @"Cell";
TableGalleryCustomCell *cell = (TableGalleryCustomCell*)[tableView dequeueReusableCellWithIdentifier:MyIdentifier];
if( cell == nil) {
NSArray *topLevelObjects = [[NSBundle mainBundle] loadNibNamed:@"TableGalleryCustomCell" owner:nil options:nil];
for (id currentObject in topLevelObjects) {
if ([currentObject isKindOfClass:[UITableViewCell class]]) {
cell = (TableGalleryCustomCell*)currentObject;
break;
}
}
}
rssItems = [[self.appDelegate rssParser] rssItems];
if (indexPath.row < [rssItems count]) {
rssItem = [rssItems objectAtIndex:indexPath.row];
cell.firstAddress.text = [rssItem Address];
cell.firstPrice.text = [rssItem Deposit];
if ([[rssItem imageURLs] count] != 0 ) {
[cell.firstImage setImageWithURL:[NSURL URLWithString:[[rssItem imageURLs] objectAtIndex:0.0]]];
cell.firstImage.tag = indexPath.row;
}
}
return cell;
}
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