Question

我暂时以编程方式向UITableViewCell添加了一些值。但我需要为每个单元格添加图像。我怎么能这样做？

这是我的代码。 .h文件

 @interface BidalertsViewController : UIViewController       <UITableViewDelegate,UITableViewDataSource> {
    NSArray *listData;
}
@property(nonatomic, retain) NSArray *listData; 
@end

.m文件

 @synthesize listData;

- (void)viewDidLoad {
UIView *newView = [[UIView alloc] initWithFrame:CGRectMake(5,0,310,28)];
newView.backgroundColor=[UIColor whiteColor];
UITextView *mytext = [[UITextView alloc] initWithFrame:CGRectMake(0.0, 0.0, 100.0, 25.0)];
mytext.backgroundColor = [UIColor clearColor];
mytext.textColor = [UIColor blackColor];
mytext.editable = NO;
mytext.font = [UIFont systemFontOfSize:15];
mytext.text = @"Asset Name";
[mytext release];
[newView addSubview:mytext];

[self.view addSubview:newView];
[newView release];


NSArray *array = [[NSArray alloc] initWithObjects:@"iPhone", @"iPod", @"iPad",nil];
self.listData = array;
[array release];
[super viewDidLoad];
}
- (void)didReceiveMemoryWarning {
     [super didReceiveMemoryWarning];
}
 - (void)dealloc {
  [listData dealloc];
  [super dealloc];
}


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

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

static NSString *SimpleTableIdentifier = @"SimpleTableIdentifier";
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier: SimpleTableIdentifier];
if (cell == nil) { cell = [[[UITableViewCell alloc]
                            initWithStyle:UITableViewCellStyleDefault reuseIdentifier:SimpleTableIdentifier] autorelease];
}
NSUInteger row = [indexPath row]; 
cell.textLabel.text = [listData objectAtIndex:row]; 
return cell;

UIImageView *imv = [[UIImageView alloc]initWithFrame:CGRectMake(3,2, 20, 25)];
imv.image=[UIImage imageNamed:@"user.jpg"];
[cell.contentView addSubview:imv];
[imv release];
 }
@end

代码未向单元格添加图像。有什么问题？如何将自定义图像添加到单元格？

Answer 1

在方法结束处移动return cell;：

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

    static NSString *SimpleTableIdentifier = @"SimpleTableIdentifier";
    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier: SimpleTableIdentifier];
    if (cell == nil) { cell = [[[UITableViewCell alloc]
                                initWithStyle:UITableViewCellStyleDefault reuseIdentifier:SimpleTableIdentifier] autorelease];
    }
    NSUInteger row = [indexPath row]; 
    cell.textLabel.text = [listData objectAtIndex:row]; 


    UIImageView *imv = [[UIImageView alloc]initWithFrame:CGRectMake(3,2, 20, 25)];
    imv.image=[UIImage imageNamed:@"user.jpg"];
    [cell.contentView addSubview:imv];
    [imv release];

    return cell;
}

Answer 2

您可以使用单元格的imageView属性添加图像：

cell.imageView.image = [UIImage imageNamed:@"user.jpg"];

在- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath方法中。

Answer 3

这是一个在表格单元格中加载facebook图像的示例单元格。

UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
    if (cell == nil)
    {
        cell = [[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleSubtitle
                                       reuseIdentifier:CellIdentifier] autorelease];
        cell.selectionStyle = UITableViewCellSelectionStyleNone;
    }

    // Leave cells empty if there's no data yet
    if (nodeCount > 0)
    {
        // Set up the cell...
        AppRecord *appRecord = [self.friendsList objectAtIndex:indexPath.row];

        cell.textLabel.text = friend.name;

        // Only load cached images; defer new downloads until scrolling ends
        if (!appRecord.icon)
        {
            // set the url
            appRecord.imageURLString = [NSString stringWithFormat:@"http://graph.facebook.com/%@/picture", friend.recordID];

            // request the download
            if (self.tableView.dragging == NO && self.tableView.decelerating == NO)
            {
                [self startIconDownload:appRecord forIndexPath:indexPath];
            }
            // if a download is deferred or in progress, return a placeholder image
            cell.imageView.image = [UIImage imageNamed:@"Placeholder.png"];                
        }
        else
        {
            cell.imageView.image = appRecord.icon;
        }

    }

    return cell;

Answer 4

你正确地添加它，但你忘了一件事：

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

    static NSString *SimpleTableIdentifier = @"SimpleTableIdentifier";
    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier: SimpleTableIdentifier];
    if (cell == nil) { cell = [[[UITableViewCell alloc]
                                initWithStyle:UITableViewCellStyleDefault reuseIdentifier:SimpleTableIdentifier] autorelease];
    }
    NSUInteger row = [indexPath row]; cell.textLabel.text = [listData objectAtIndex:row];

    UIImageView *imv = [[UIImageView alloc]initWithFrame:CGRectMake(3,2, 20, 25)];
    imv.image=[UIImage imageNamed:@"user.jpg"];
    [cell.contentView addSubview:imv];
    [imv release];

    //you fogot this:
    return cell;
     }

Answer 5

//为图像视图创建一个矩形框

UIImageView *iconImage = [[UIImageView alloc] init];
iconImage.frame = CGRectMake(12,4,53.5,53.5);

// Create a label for cells
UILabel *cellName = [[UILabel alloc] initWithFrame:CGRectMake(75,18,200,20)];
cellName.font = [self fontForBodyTextStyle];

NSString *cellNameStr = [NSString stringWithFormat:@"%@",self.tableCellNames[indexPath.row]];

// Select path row tab actions
switch (indexPath.row) {
    case 0:

        cellName.text = cellNameStr;
        iconImage.image = [UIImage imageNamed:@"condition.png"];
        [cell.contentView addSubview:iconImage];
        [cell.contentView addSubview:cellName];

        break;

    case 1:
       cellName.text = cellNameStr;
        iconImage.image = [UIImage imageNamed:@"videos.png"];
        [cell.contentView addSubview:iconImage];
        [cell.contentView addSubview:cellName];
        break;

    case 2:
        cellName.text = cellNameStr;
        iconImage.image = [UIImage imageNamed:@"provider.png"];
        [cell.contentView addSubview:iconImage];
        [cell.contentView addSubview:cellName];
        break;

    case 3:
        cellName.text = cellNameStr;
        iconImage.image = [UIImage imageNamed:@"info.png"];
        [cell.contentView addSubview:iconImage];
        [cell.contentView addSubview:cellName];
        break;

    default:
        NSAssert(NO, @"Unhandled value in cellForRowAtIndexPath");
        break;
}

感谢VKJ，

如何将图像添加到UITableView单元格？

5 个答案: