Ios 自定义UITableViewCells在滚动时消失

我正在制作一个应用程序，其中我有一些MKMapView注释。我还有一个列表（UITableView），其中包含了关于这些注释所表示的位置的更多信息，我的问题就发生在这些位置。我使用自己的UITableViewCell子类，它有3个UILabel：默认的textLabel，用于地名、addressLabel和phoneNumberLabel。我必须考虑这些标签中的文本太大，不能在一行中显示，并相应地调整uLabeles的情况。我也要考虑的情况下，没有电话号码或地址，根据UIABABELS应该“消失”（帧大小为0）。 问题是，当我向下滚动表格时，单元格会从屏幕的上部消失（我滚动得越远，其中就有越多的单元格不可见，而对于大多数UITableView来说，根本没有显示单元格，只有部分标题，即使整张表格的大小没有改变）

（截图应该放在这里，但stackoverflow不允许我发布：（） ！[在此处输入图像描述][1]

以下是我的自定义UITableViewCell子类：

@implementation POICell

- (id)initWithStyle:(UITableViewCellStyle)style reuseIdentifier:(NSString *)reuseIdentifier
{
    self = [super initWithStyle:style reuseIdentifier:reuseIdentifier];
    if (self) {
        // Initialization code
        self.addressLabel = [[UILabel alloc] init];
        self.phoneNumberLabel = [[UILabel alloc] init];
        [self addSubview:self.addressLabel];
        [self addSubview:self.phoneNumberLabel];
        self.addressLabel.font = [UIFont fontWithName:@"Helvetica" size:14];
        self.phoneNumberLabel.font = [UIFont fontWithName:@"Helvetica" size:14];
        self.textLabel.font = [UIFont fontWithName:@"Helvetica-Bold" size:20];

        self.addressLabel.lineBreakMode = UILineBreakModeWordWrap;
        self.phoneNumberLabel.lineBreakMode = UILineBreakModeWordWrap;
        self.textLabel.lineBreakMode = UILineBreakModeWordWrap;
    }
    return self;
}

- (void)layoutSubviews {
    [super layoutSubviews];

    CGRect titleFrame = self.frame;
    titleFrame.origin.x += 30;
    titleFrame.size.width -= 60;
    titleFrame.size.height = [self.textLabel.text sizeWithFont:self.textLabel.font forWidth:self.textLabel.frame.size.width lineBreakMode:NSLineBreakByWordWrapping].height;
    self.textLabel.frame = titleFrame;
    if (self.addressLabel.text != nil) {
        self.addressLabel.frame = CGRectMake(titleFrame.origin.x, [DDUtility yRelativeTo:self.textLabel withMargin:0], titleFrame.size.width, [self.addressLabel.text sizeWithFont:self.addressLabel.font forWidth:self.addressLabel.frame.size.width lineBreakMode:NSLineBreakByWordWrapping].height);
    }
    else {
        self.addressLabel.frame = CGRectMake(titleFrame.origin.x, [DDUtility yRelativeTo:self.textLabel withMargin:0], 0, 0);
    }
    NSString *labelText = self.addressLabel.text;
    if (self.phoneNumberLabel.text != nil) {
        self.phoneNumberLabel.frame = CGRectMake(titleFrame.origin.x, [DDUtility yRelativeTo:self.addressLabel withMargin:0], titleFrame.size.width, [self.phoneNumberLabel.text sizeWithFont:self.phoneNumberLabel.font forWidth:self.phoneNumberLabel.frame.size.width lineBreakMode:NSLineBreakByWordWrapping].height);

    }
    else {
        self.phoneNumberLabel.frame = CGRectMake(titleFrame.origin.x, [DDUtility yRelativeTo:self.addressLabel withMargin:0], 0, 0);
    }
    labelText = self.phoneNumberLabel.text;

}

这里是我的UIViewController的一部分，它是我的两个表的委托和数据源-categoryTable工作得很好，我对它有问题

poiArraysDictionary是一个字典，其中键是兴趣点类别的名称，值是该类别点的数组。点本身是我作为JSON从服务器上获取的字典，具有像name、address（可以为null）和phone（可以为null）这样的键

-（void）viewDidLoad{
(...)
UITableView*poiTable=[[UITableView alloc]initWithFrame:CGRectMake（0，120，listView.frame.size.width，listView.frame.size.height-120）样式：UITableViewStylePlain]；
poiTable.separatorStyle=UITableViewCellSeparatorStyleNone；
//poiTable.rowHeight=80；
poiTable.dataSource=self；
poiTable.delegate=self；
poiTable.backgroundColor=[UIColor clearColor]；
self.poiTable=poiTable；
[poiTable reloadData]；
[self.listView addSubview:poiTable]；
(...)
}
-（NSInteger）表格视图中的节数：（UITableView*）表格视图{
if（tableView==self.categoryTable）{
返回1；
}
否则{
返回[self.categoryArray count]；
}
}
-（NSInteger）表视图：（UITableView*）表视图行数节：（NSInteger）节{
if（tableView==self.categoryTable）{
返回[self.categoryArray count]；
}
否则{
返回[[self.poiArraysDictionary objectForKey:[self.categoryArray objectAtIndex:section]]count]；
}
}
-（UITableViewCell*）tableView:（UITableView*）tableView cellForRowAtIndexPath:（NSIndexPath*）indexPath
{
if（tableView==self.categoryTable）{
UITableViewCell*单元格=[tableView dequeueReusableCellWithIdentifier:@“categoryCell”]；
如果（单元格==nil）{
cell=[[CategoryCell alloc]initWithStyle:UITableViewCellStyleDefault重用标识符：@“CategoryCell”]自动释放]；
}
cell.textlab.text=[self.categoryArray objectAtIndex:indexPath.row]；
cell.selectionStyle=UITableViewCellSelectionStyleNone；
cell.backgroundColor=[UIColor clearColor]；
返回单元；
}
否则{
POICell*单元格=[tableView dequeueReusableCellWithIdentifier:@“POICell”]；
如果（单元格==nil）{
cell=[[POICell alloc]initWithStyle:UITableViewCellStyleDefault重用标识符：@“POICell”]自动释放]；
}
/*int maxIndex=[self.pointsOfInterestArray计数]；
整数指数；
int indexInSection=0；
对于（索引=0；索引- (void) viewDidLoad {
    (...)

    UITableView *poiTable = [[UITableView alloc] initWithFrame:CGRectMake(0, 120, listView.frame.size.width, listView.frame.size.height -  120) style:UITableViewStylePlain];
    poiTable.separatorStyle = UITableViewCellSeparatorStyleNone;
    //poiTable.rowHeight = 80;
    poiTable.dataSource = self;
    poiTable.delegate = self;
    poiTable.backgroundColor = [UIColor clearColor];
    self.poiTable = poiTable;
    [poiTable reloadData];
    [self.listView addSubview:poiTable];

    (...)
}



- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView {
    if (tableView == self.categoryTable) {
        return 1;
    }
    else {
        return [self.categoryArray count];
    }
}


- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {
    if (tableView == self.categoryTable) {
        return [self.categoryArray count];
    }
    else {
        return [[self.poiArraysDictionary objectForKey:[self.categoryArray objectAtIndex:section]] count];
    }
}


- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
    if (tableView == self.categoryTable) {
        UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:@"categoryCell"];
        if (cell == nil) {
            cell = [[[CategoryCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:@"categoryCell"] autorelease];
        }

        cell.textLabel.text = [self.categoryArray objectAtIndex:indexPath.row];
        cell.selectionStyle = UITableViewCellSelectionStyleNone;
        cell.backgroundColor = [UIColor clearColor];

        return cell;
    }
    else {
        POICell *cell = [tableView dequeueReusableCellWithIdentifier:@"poiCell"];
        if (cell == nil) {
            cell = [[[POICell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:@"poiCell"] autorelease];
        }

        /*int maxIndex = [self.pointsOfInterestArray count];
         int index;
         int indexInSection = 0;
         for (index = 0; index < maxIndex; ++index) {
         if ([((NSString*)([((NSDictionary*)([self.pointsOfInterestArray objectAtIndex:index])) objectForKey:@"category"])) isEqualToString:[self.categoryArray objectAtIndex:indexPath.section]]) {
         if (indexInSection != indexPath.row) {
         ++indexInSection;
         }
         else {
         break;
         }
         }
         }

         cell.textLabel.text = [[self.pointsOfInterestArray objectAtIndex:index] objectForKey:@"name"];
         if ([[[self.pointsOfInterestArray objectAtIndex:index] objectForKey:@"address"] class] != [NSNull class]) {
         cell.addressLabel.text = [[self.pointsOfInterestArray objectAtIndex:index] objectForKey:@"address"];
         }
         if ([[[self.pointsOfInterestArray objectAtIndex:index] objectForKey:@"phone"] class] != [NSNull class]) {
         cell.phoneNumberLabel.text = [[self.pointsOfInterestArray objectAtIndex:index] objectForKey:@"phone"];
         }*/

        if ([[[[self.poiArraysDictionary objectForKey:[self.categoryArray objectAtIndex:indexPath.section]] objectAtIndex:indexPath.row] objectForKey:@"name"] class] == [NSNull class]) {
            return nil;
        }

        cell.textLabel.text = [[[self.poiArraysDictionary objectForKey:[self.categoryArray objectAtIndex:indexPath.section]] objectAtIndex:indexPath.row] objectForKey:@"name"];

        if ([[[[self.poiArraysDictionary objectForKey:[self.categoryArray objectAtIndex:indexPath.section]] objectAtIndex:indexPath.row] objectForKey:@"address"] class] == [NSNull class]) {
            cell.addressLabel.text = nil;
        }
        else {
            cell.addressLabel.text = [[[self.poiArraysDictionary objectForKey:[self.categoryArray objectAtIndex:indexPath.section]] objectAtIndex:indexPath.row] objectForKey:@"address"];
        }

        if ([[[[self.poiArraysDictionary objectForKey:[self.categoryArray objectAtIndex:indexPath.section]] objectAtIndex:indexPath.row] objectForKey:@"phone"] class] == [NSNull class]) {
            cell.phoneNumberLabel.text = nil;
        }
        else {
            cell.phoneNumberLabel.text = [@"telefon: " stringByAppendingString:[[[self.poiArraysDictionary objectForKey:[self.categoryArray objectAtIndex:indexPath.section]] objectAtIndex:indexPath.row] objectForKey:@"phone"]];
        }

        cell.selectionStyle = UITableViewCellSelectionStyleNone;
        cell.backgroundColor = [UIColor clearColor];

        CGRect cellFrame = cell.frame;
        return cell;

    }
}

- (CGFloat)tableView:(UITableView *)tableView heightForHeaderInSection:(NSInteger)section {
    if (tableView == self.categoryTable) {
        return 0;
    }
    else {
        return 40;
    }
}

- (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath {
    if (tableView == self.categoryTable) {
        return 50;
    }
    else {
        NSDictionary *point = [[self.poiArraysDictionary objectForKey:[self.categoryArray objectAtIndex:indexPath.section]] objectAtIndex:indexPath.row];
        CGFloat rowHeight = 0;
        if ([[point objectForKey:@"name"] class] != [NSNull class]) {
            rowHeight += [[point objectForKey:@"name"] sizeWithFont:[UIFont fontWithName:@"Helvetica-Bold" size:20] forWidth:self.poiTable.frame.size.width lineBreakMode:NSLineBreakByWordWrapping].height;
        }

        if ([[point objectForKey:@"address"] class] != [NSNull class]) {
            rowHeight += [[point objectForKey:@"address"] sizeWithFont:[UIFont fontWithName:@"Helvetica" size:14] forWidth:self.poiTable.frame.size.width lineBreakMode:NSLineBreakByWordWrapping].height;
        }

        if ([[point objectForKey:@"phone"] class] != [NSNull class]) {
            rowHeight += [[point objectForKey:@"phone"] sizeWithFont:[UIFont fontWithName:@"Helvetica" size:14] forWidth:self.poiTable.frame.size.width lineBreakMode:NSLineBreakByWordWrapping].height;
        }

        return rowHeight;
    }
}