Iphone：UITableView 标题行在 6 行后重复

Posted 2023-03-04

【中文标题】Iphone：UITableView 标题行在 6 行后重复

【英文标题】：Iphone : UITableView Header row repeating after 6 rows

【发布时间】：2012-05-04 14:32:45

【问题描述】：

我正在开发一个通用应用程序。在这个应用程序中有一个 UITableView。问题是 TableView 中的标题行在 iphone 中的 6 行和 iPad 中的 9 行之后重复。

我用谷歌搜索但没有找到解决此标题问题的解决方案。请帮忙。

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section 
    // Return the number of rows in the section.

    return [tripList count];

UiTableview cellForRowAtIndexPath 代码：

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath 

    static NSString *CellIdentifier = @"Cell";

    UILabel *lblTripNumber = nil;
    UILabel *lblTripState = nil;
    UIImageView *imgTripState = nil;
    UILabel *lblStateTitleText = nil;
    UILabel *lblTripNUmberTitleValue = nil;

    static NSUInteger const kTripNumberLabelTag = 2;
    static NSUInteger const kTripStateLabelTag = 3;
    static NSUInteger const kTripImageTag = 4;


    BOOL isiPhone = UI_USER_INTERFACE_IDIOM() == UIUserInterfaceIdiomPhone;
    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
    if(indexPath.row == 0)
    
        if (cell == nil) 
            cell = [[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier] autorelease];

            if (!isiPhone) // 1=Ipad        
            
                lblStateTitleText = [[[UILabel alloc] initWithFrame:CGRectMake(205, 27, 250, (cell.contentView.frame.size.height))] autorelease];
                lblStateTitleText.font = [UIFont boldSystemFontOfSize:32];
            
            else
            
                lblStateTitleText = [[[UILabel alloc] initWithFrame:CGRectMake(65, 10, 130, (cell.contentView.frame.size.height))] autorelease];
                lblStateTitleText.font = [UIFont boldSystemFontOfSize:16];
            
            lblStateTitleText.textAlignment = UITextAlignmentLeft;
            lblStateTitleText.backgroundColor = [UIColor clearColor];
            lblStateTitleText.tag = 11;     
            lblStateTitleText.text = @"Trip State"; 
            lblStateTitleText.textColor = [UIColor cyanColor];
            [cell.contentView addSubview:lblStateTitleText];

            if (!isiPhone) // 1=Ipad        
            
                lblTripNUmberTitleValue = [[[UILabel alloc] initWithFrame:CGRectMake(445, 27, 290, (cell.contentView.frame.size.height))] autorelease];
                lblTripNUmberTitleValue.font = [UIFont boldSystemFontOfSize:32];
            
            else
            
                lblTripNUmberTitleValue = [[[UILabel alloc] initWithFrame:CGRectMake(180, 10, 250, (cell.contentView.frame.size.height))] autorelease];
                lblTripNUmberTitleValue.font = [UIFont boldSystemFontOfSize:16];
            
            lblTripNUmberTitleValue.textAlignment = UITextAlignmentLeft;
            lblTripNUmberTitleValue.backgroundColor = [UIColor clearColor];
            lblTripNUmberTitleValue.tag = 12;       
            lblTripNUmberTitleValue.text = @"Confirmation#";    
            lblTripNUmberTitleValue.textColor = [UIColor greenColor];
            [cell.contentView addSubview:lblTripNUmberTitleValue];  

        

    
    else 
       
        if (cell == nil) 
            cell = [[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier] autorelease];

            CGFloat xIndex = 6.0;       
            CGFloat xIpadIndex = 6.0;

            CGFloat TripNumberLabelWidth = 130.0;

            if (!isiPhone) // 1=Ipad        
            
                imgTripState = [[[UIImageView alloc] initWithFrame:CGRectMake(xIndex, 18, 50, 64)] autorelease];
            
            else
            
                imgTripState = [[[UIImageView alloc] initWithFrame:CGRectMake(xIndex, 8, 32, 32)] autorelease];
            

            imgTripState.tag = kTripImageTag;
            [cell.contentView addSubview:imgTripState];

            xIndex +=73;
            xIpadIndex +=85;

            if (!isiPhone) // 1=Ipad        
            
                lblTripState = [[[UILabel alloc] initWithFrame:CGRectMake(xIpadIndex, 25, TripNumberLabelWidth, (cell.contentView.frame.size.height))] autorelease];
                lblTripState.font = [UIFont boldSystemFontOfSize:38];
            
            else
            
                lblTripState = [[[UILabel alloc] initWithFrame:CGRectMake(xIndex, 1, TripNumberLabelWidth, (cell.contentView.frame.size.height))] autorelease];
                lblTripState.font = [UIFont boldSystemFontOfSize:20];
            
            lblTripState.textAlignment = UITextAlignmentLeft;
            lblTripState.backgroundColor = [UIColor clearColor];
            lblTripState.tag = kTripStateLabelTag;      
            lblTripState.textColor = [UIColor colorWithRed:(0.0/255) green:(241.0/255) blue:(216.0/255) alpha:1.0f];
            [cell.contentView addSubview:lblTripState];

            xIndex +=132;
            xIpadIndex +=120;

            if (!isiPhone) // 1=Ipad
            
                lblTripNumber = [[[UILabel alloc] initWithFrame:CGRectMake(xIpadIndex, 25, TripNumberLabelWidth, (cell.contentView.frame.size.height))] autorelease];
                lblTripNumber.font = [UIFont boldSystemFontOfSize:35];
            
            else
            
                lblTripNumber = [[[UILabel alloc] initWithFrame:CGRectMake(xIndex, 0, TripNumberLabelWidth, (cell.contentView.frame.size.height))] autorelease];
                lblTripNumber.font = [UIFont boldSystemFontOfSize:18];
            

            lblTripNumber.textAlignment = UITextAlignmentLeft;
            lblTripNumber.backgroundColor = [UIColor clearColor];
            lblTripNumber.tag = kTripNumberLabelTag;        
            lblTripNumber.textColor = [UIColor greenColor];
            [cell.contentView addSubview:lblTripNumber];

        else
        
            // A reusable cell was available, so we just need to get a reference to the subviews using their tags.
            lblTripNumber = (UILabel *)[cell.contentView viewWithTag:kTripNumberLabelTag];
            lblTripState = (UILabel *)[cell.contentView viewWithTag:kTripStateLabelTag];
        //  imgTripState = (UILabel *)[cell.contentView viewWithTag:kTripImageTag];
        

        lblTripNumber.autoresizingMask = UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleLeftMargin | UIViewAutoresizingFlexibleRightMargin;
        lblTripState.autoresizingMask = UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleLeftMargin | UIViewAutoresizingFlexibleRightMargin;


        int indCount = indexPath.row -1;
        TripDetails *trip = [tripList objectAtIndex:indCount];
        lblTripNumber.text = trip.tripNumber;
        lblTripState.text = trip.tripState;


    // Configure the cell...

    return cell;

【问题讨论】：

将viewForHeader的代码放入section和section的数量

【参考方案1】：

您的 TableData 中可能只有 6 个项目。

-(NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section 

   return [TableData count];

在您的情况下，“TableData”是“tripList”。

【参考方案2】：

我知道了，我删除了

if (cell == nil) 

而且效果很好。实际上它是在第一个标题行中寻找它的标签，并且无法替换它的值，所以产生了问题。

【讨论】：

我也是这样做的，但是我的应用程序崩溃了

【参考方案3】：

在部分中检查您的 viewFor 标题。如果您将数组用于标题视图，则此数组对象未正确分配内存。它使用最后一个对象来完成它的所有发生并替换旧的。在向其中添加对象之前，先创建一个数组的内存分配对象。告诉我这是否是解决方案

【讨论】：

没错，因为您正在重用单元格，它们会向您显示已经填充的旧单元格。这就是为什么我说你应该将单元格的数量限制为数组中的对象数量，你应该没问题。

【参考方案4】：

您的代码尝试重用单元格，但您的编码方式是错误的。有关适当的模式，请参阅我的回答 here。简而言之，您应该只在if (cell == nil) 部分中定义共享单元格属性，行特定属性，如标签文本等应该在此部分之外定义。对于索引 0 处的行，情况并非如此。