我在一个包含5个单元格的表视图上遇到了一个奇怪的错误。由于大的单元高度，第五个单元最初在屏幕外，用户需要向下滚动才能看到它。单元格显示下载按钮，进度指示器，如果下载完成，则显示“查看”按钮，而不是下载和进度。
前4个单元格正确显示。然而，第五个单元格有时会丢失下载按钮，但有时它会在每次重启应用程序时以大约50％的几率正确显示。源数据在任何时候都不会更改。
我使用了断点来查看向下滚动时会发生什么，但是我无法发现任何异常情况，并且当单元格出现时数据已正确提供。
有人可以说出我应该关注的地方吗？
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
static NSString *MyIdentifier = @"cell1";
NSDictionary *categoryDictionary= [[appdelegate categoriesArray] objectAtIndex:indexPath.row];
categoryTableViewCell* cell = [tableView dequeueReusableCellWithIdentifier:MyIdentifier];
rect=cell.labelProgressView.frame;
cell.backgroundColor = [UIColor PGColorBackground];
cell.buttonView.hidden=YES;
//Set background colors and icons
switch ([[categoryDictionary valueForKey:@"categoryID"] intValue])
{
case 1:
[cell.buttonView setBackgroundColor: [UIColor PGColorAttractions]] ;
[cell.labelProgressView setBackgroundColor: [UIColor PGColorAttractions]] ;
[cell.ivCategoryBannerImage setImage: [UIImage imageNamed:@"attraction-bg"]];
cell.ivcategoryLogoImage.image =[UIImage imageNamed:@"attractionWhite"];
break;
case 2:
[cell.buttonView setBackgroundColor: [UIColor PGColorRestaurants]];
[cell.labelProgressView setBackgroundColor: [UIColor PGColorRestaurants]];
[cell.ivCategoryBannerImage setImage: [UIImage imageNamed:@"restaurant-bg"]];
cell.ivcategoryLogoImage.image =[UIImage imageNamed:@"restaurantWhite"];
break;
case 3:
[cell.buttonView setBackgroundColor: [UIColor PGColorShopping]];
[cell.labelProgressView setBackgroundColor:[UIColor PGColorShopping]];
[cell.ivCategoryBannerImage setImage: [UIImage imageNamed:@"shopping-bg"]];
cell.ivcategoryLogoImage.image =[UIImage imageNamed:@"shoppingWhite"];
break;
case 4:
[cell.buttonView setBackgroundColor: [UIColor PGColorAccomodations]];
[cell.labelProgressView setBackgroundColor:[UIColor PGColorAccomodations]];
[cell.ivCategoryBannerImage setImage: [UIImage imageNamed:@"accomodation-bg"]];
cell.ivcategoryLogoImage.image =[UIImage imageNamed:@"accomodationWhite"];
break;
case 5:
[cell.buttonView setBackgroundColor: [UIColor PGColorArtGalleries]];
[cell.labelProgressView setBackgroundColor:[UIColor PGColorArtGalleries]];
[cell.ivCategoryBannerImage setImage: [UIImage imageNamed:@"artGallery-bg"]];
cell.ivcategoryLogoImage.image =[UIImage imageNamed:@"artGalleryWhite"];
break;
default:
break;
}
//DOWNLOAD Button
[cell.buttonViewDownload setBackgroundColor:[UIColor clearColor]];
cell.buttonViewDownload.layer.borderColor=[UIColor whiteColor].CGColor;
cell.buttonViewDownload.layer.borderWidth=1.0f;
[cell.buttonViewDownload.titleLabel setFont:[UIFont fontWithName:@"OpenSans-Bold" size:10]];
[cell.buttonViewDownload setTag:[[categoryDictionary valueForKey:@"categoryID"] intValue]];
//VIEW Button
cell.buttonView.layer.borderColor=[UIColor whiteColor].CGColor;
cell.buttonView.layer.borderWidth=1.0f;
[cell.buttonView.titleLabel setFont:[UIFont fontWithName:@"OpenSans-Bold" size:10]];
[cell.buttonView setTag:[[categoryDictionary valueForKey:@"categoryID"] intValue]];
[cell.buttonView addTarget:self action:@selector(viewbuttonClicked:) forControlEvents:UIControlEventTouchUpInside];
//CATEGORY label
NSString *categoryName =[[NSString stringWithFormat:@"%@",[categoryDictionary valueForKey:@"categoryNameen"]] uppercaseString];
NSMutableAttributedString *attributedString;
attributedString = [[NSMutableAttributedString alloc] initWithString:categoryName];
[attributedString addAttribute:NSKernAttributeName
value:[NSNumber numberWithFloat:8.0]
range:NSMakeRange(0, [categoryName length])];
[attributedString addAttribute:NSFontAttributeName
value:[UIFont fontWithName:@"OpenSans-Bold" size:19]
range:NSMakeRange(0, [categoryName length])];
[cell.labelCategory setAttributedText:attributedString];
cell.selectionStyle=UITableViewCellAccessoryNone;
//Set State
cell.ivCategoryBannerImage.alpha =0.1f;
BOOL isAvailable = [[categoryDictionary valueForKey:@"isAvailable"] boolValue];
BOOL userTappedDownload = [[categoryDictionary valueForKey:@"userTappedDownload"] boolValue];
NSLog(@"isAvailable: %d", isAvailable);
NSLog(@"userTappedDownload: %d", isAvailable);
if (isAvailable && userTappedDownload)
{
cell.buttonView.hidden=NO;
[cell.buttonView setTitle:@"VIEW" forState:UIControlStateNormal];
cell.buttonViewDownload.hidden=YES;
cell.ivCategoryBannerImage.alpha =1.0f;
rect.size.width=208.0f;
}
else if(!isAvailable && !userTappedDownload)
{
rect.size.width=0.1f;
[cell.buttonViewDownload setTitle:[NSString stringWithFormat:@"DOWNLOAD (%@ KB)",[categoryDictionary valueForKey:@"totalImagesSize"]] forState:0];
}
else if(!isAvailable && userTappedDownload)
{
rect.size.width=[[categoryDictionary valueForKey:@"totalImagesAvailable"] intValue];
[cell.buttonViewDownload setTitle:@"DOWNLOADING CONTENT" forState:UIControlStateNormal];
cell.buttonViewDownload.userInteractionEnabled = NO;
}
return cell;
}
答案 0 :(得分：1)
可能是第五个单元格正在重复使用设置<table>
<tr>
<th scope="col"></th>
<th scope="col">noRisk</th>
<th scope="col">lowRisk</th>
<th scope="col">mediumRisk</th>
<th scope="col">HighRisk</th>
</tr>
<tr>
<th scope="row">
<div class="lefttext">How old are you?</div>
</th>
<td>
<input type="radio" id="value1" name="selectedAge" value="0" checked>1-25</td>
<td>
<input type="radio" id="value1" name="selectedAge" value="5">26-40</td>
<td>
<input type="radio" id="value1" name="selectedAge" value="8">41-60</td>
<td>
<input type="radio" id="value1" name="selectedAge" value="10">1-25</td>
</tr>
<tr>
<th scope="row">
<div class="lefttext">What is you BMI?</div>
</th>
<td>
<input type="radio" id="value2" name="selectedBmi" value="0" checked>0-25</td>
<td>
<input type="radio" id="value2" name="selectedBmi" value="0">26-30</td>
<td>
<input type="radio" id="value2" name="selectedBmi" value="9">31-35</td>
<td>
<input type="radio" id="value2" name="selectedBmi" value="10">35+</td>
</tr>
<tr>
<th scope="row">
<div class="lefttext">Does anybody in your family have diabetes?</div>
</th>
<td>
<input type="radio" id="value3" name="selectedDiabete" value="0" checked>No</td>
<td>
<input type="radio" id="value3" name="selectedDiabete" value="7">Grandparent</td>
<td>
<input type="radio" id="value3" name="selectedDiabete" value="15">Sibling</td>
<td>
<input type="radio" id="value3" name="selectedDiabete" value="15">Parent</td>
</tr>
<tr>
<th scope="row">
<div class="lefttext">How would you describe your diabete</div>
</th>
<td>
<input type="radio" id="value4" name="description" value="0" checked>Low sugar</td>
<td>
<input type="radio" id="value4" name="description" value="0">Normal sugar</td>
<td>
<input type="radio" id="value4" name="description" value="7">Quite high sugar</td>
<td>
<input type="radio" id="value4" name="description" value="10">High sugar</td>
</tr>
</table>
<input type="button" name="submit" value="Submit" onclick="javascript:addNumbers()" />Total =
<input type="text" id="answer" name="answer" value="" />
<section>
<h2>Your results:</h2>
<div class="results" id="lowResult">
<p>Your results show that you currently have a low risk of developing diabetes. However, it is important that you maintain a healthy lifestyle in terms of diet and exercise.
</p>
</div>
<div class="results" id="mediumResult">
<p>Your results show that you currently have a medium risk of developing diabetes. For more information on your risk factors, and what to do about them, please visit our diabetes advice website at <a href="http://www.zha.org.zd">http://www.zha.org.zd</a>.
<p>
</div>
<div class="results" id="highRisk">
<p>Your results show that you currently have a HIGH risk of developing diabetes. [Your main risk factors are your BMI and your diet.] We advise that you contact the Health Authority to discuss your risk factors as soon as you can. Please fill in our
contact form and a member of the Health Authority Diabetes Team will be in contact with you.
</div>
</section>的前一个单元格之一。
尝试将cell.buttonViewDownload.hidden=YES;添加到应显示下载按钮的分支。