在IOS 7中扩展表视图单元格 [英] Table view cell expanding in IOS 7

问题描述

我正在开发一个iOS应用程序。我使用了表格视图。当用户点击任何单元格时，单元格会扩展。但有些单元格在iOS 7中没有扩展。其他版本运行正常。以下是示例代码。我怎样才能纠正它？

I am developing an iOS application. I have used a table view. When the user clicks to any cell then the cell expands. But some cells are not expanding in iOS 7. Other versions run correctly. Below is the sample code. How can I correct it?

- (BOOL)cellIsSelected:(NSIndexPath *)indexPath {
    // Return whether the cell at the specified index path is selected or not
    NSNumber *selectedIndex = [selectedIndexes objectForKey:indexPath];
    return selectedIndex == nil ? FALSE : [selectedIndex boolValue];
}


#pragma mark - Table view data source

- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
{
    return 1;
}

- (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath
{
    if([self cellIsSelected:indexPath])
        {
            return 111;
        }
        // Cell isn't selected so return single height
        return 41;
}

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
    return  [self.filteredItineraries count];
}

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
    static NSString *simpleTableIdentifier = @"FlightTracker";

    CellFlightTracker *cell = (CellFlightTracker *)[tableView dequeueReusableCellWithIdentifier:simpleTableIdentifier];


    if(cell == nil)
    {
        NSArray *nib=nil;

        nib = [[NSBundle mainBundle] loadNibNamed:@"CellFlightTracker" owner:self options:nil];

        cell = [nib objectAtIndex:0];
     }




        if([self cellIsSelected:indexPath])
        {
            cell.backgroundColor=[UIColor blackColor];
        }else
        {
            cell.backgroundColor=[UIColor darkGrayColor];
        }


    return cell;
}

- (void)tableView:(UITableView *)tableView willDisplayCell:(UITableViewCell *)cell forRowAtIndexPath:(NSIndexPath *)indexPath
{
     if([self cellIsSelected:indexPath])
             cell.backgroundColor= [UIColor blackColor];
         else
             cell.backgroundColor= [UIColor darkGrayColor];
}

-(void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath{

    [tableView deselectRowAtIndexPath:indexPath animated:TRUE];

        // Toggle 'selected' state
        BOOL isSelected = ![self cellIsSelected:indexPath];

        // Store cell 'selected' state keyed on indexPath
        NSNumber *selectedIndex = [NSNumber numberWithBool:isSelected];
        [selectedIndexes setObject:selectedIndex forKey:indexPath];


        // This is where magic happens...
        [tableView1 beginUpdates];
        CellFlightTracker *selectedCell = (CellFlightTracker*)[tableView cellForRowAtIndexPath:indexPath];



        if(selectedCell.lblDepartureAirportStatus.hidden)
            [selectedCell.lblDepartureAirportStatus setHidden:NO];
        else
            [selectedCell.lblDepartureAirportStatus setHidden:YES];


        [tableView1 endUpdates];
}

推荐答案

如果你会更好子类和UITableViewCell，并在调整单元格大小时使用layoutSubviews进行调整。

It would be better if you subclass and UITableViewCell and use the layoutSubviews to adjust when you adjust the size of the cell.

//In SMTableViewCell.h

@interface SMTableViewCell : UITableViewCell

@property (weak, nonatomic) IBOutlet UILabel *statusLabel;
@property (weak, nonatomic) IBOutlet UIButton *seeMoreButton;

//SMTableViewCell.m

- (void)layoutSubviews
{
    CGRect labelFrame = self.statusLabel.frame;
    labelFrame.size.height = self.frame.size.height - 55.0f;
    self.statusLabel.frame = labelFrame;

    CGRect buttonFrame = self.seeMoreButton.frame;
    buttonFrame.origin.y = labelFrame.origin.y+labelFrame.size.height+10.0f;
    self.seeMoreButton.frame = buttonFrame;
}

保留一个数组来存储selectedIndexPaths

Keep an array to store the selectedIndexPaths

@property (nonatomic, strong) NSMutableArray *selectedIndexPaths;

计算单元格的高度

- (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath;
{
    BOOL isSelected = [self.selectedIndexPaths containsObject:indexPath];

    CGFloat maxHeight = MAXFLOAT;
    CGFloat minHeight = 40.0f;

    CGFloat constrainHeight = isSelected?maxHeight:minHeight;
    CGFloat constrainWidth  = tableView.frame.size.width - 20.0f;

    NSString *text       = self.items[indexPath.row];
    CGSize constrainSize = CGSizeMake(constrainWidth, constrainHeight);
    CGSize labelSize     = [text sizeWithFont:[UIFont systemFontOfSize:15.0f]
                            constrainedToSize:constrainSize
                                lineBreakMode:NSLineBreakByCharWrapping];

    return MAX(labelSize.height+75, 100.0f);

}

初始化自定义显示更多TableViewCell

Initialize custom Show more TableViewCell

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
    static NSString *cellIdentifier = @"CellIdentifier";

    SMTableViewCell *cell= (SMTableViewCell *)[tableView dequeueReusableCellWithIdentifier:cellIdentifier];

    if (cell == nil)
    {
        cell = [[[NSBundle mainBundle]loadNibNamed:NSStringFromClass([SMTableViewCell class])
                                             owner:nil
                                           options:nil] lastObject];
    }

    BOOL isSelected = [self.selectedIndexPaths containsObject:indexPath];
    cell.statusLabel.numberOfLines = isSelected?0:2;

    NSString *text = self.items[indexPath.row];
    cell.statusLabel.text = text;


    NSString *buttonTitle = isSelected?@"See Less":@"See More";
    [cell.seeMoreButton setTitle:buttonTitle forState:UIControlStateNormal];
    [cell.seeMoreButton addTarget:self action:@selector(seeMoreButtonPressed:) forControlEvents:UIControlEventTouchUpInside];
    [cell.seeMoreButton setTag:indexPath.row];

    cell.selectionStyle = UITableViewCellSelectionStyleNone;

    return cell;
}

按钮点击事件方法

- (void)seeMoreButtonPressed:(UIButton *)button
{
    NSIndexPath *indexPath = [NSIndexPath indexPathForRow:button.tag inSection:0];
    [self addOrRemoveSelectedIndexPath:indexPath];
}

- (void)addOrRemoveSelectedIndexPath:(NSIndexPath *)indexPath
{
    if (!self.selectedIndexPaths) {
        self.selectedIndexPaths = [NSMutableArray new];
    }

    BOOL containsIndexPath = [self.selectedIndexPaths containsObject:indexPath];

    if (containsIndexPath) {
        [self.selectedIndexPaths removeObject:indexPath];
    }else{
        [self.selectedIndexPaths addObject:indexPath];
    }

    [self.tableView reloadRowsAtIndexPaths:@[indexPath]
                     withRowAnimation:UITableViewRowAnimationFade];

}

如果选择了单元格，则会给出相同的事件

Same Event is given if the cell is selected

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
    [tableView deselectRowAtIndexPath:indexPath animated:YES];

    [self addOrRemoveSelectedIndexPath:indexPath];

}

示例演示项目链接。

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