iphone - UITableViewCell 中的 UILabel 无需创建单独的类即可创建自定义单元格

Question

在我的表格 View 单元格中，我需要在单个单元格中显示数组元素的内容，如果我插入任何新内容，则不会覆盖以前的内容。应该按顺序显示以前的内容和我的新内容.这是我的代码

- (void)viewDidLoad
{
[super viewDidLoad];




NSMutableArray *arrMain=[NSMutableArray arrayWithObjects: cnfqty, cnftitle, cnfrate, nil];

finarray=[[NSMutableArray alloc]init];
[finarray addObjectsFromArray:arrMain];
   NSLog(@"%@",finarray);


}

- (void)viewDidUnload
{
[super viewDidUnload];
// Release any retained subviews of the main view.
// e.g. self.myOutlet = nil;
}

- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation
 {
return (interfaceOrientation == UIInterfaceOrientationPortrait);
 }

 #pragma mark - Table view data source

 - (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
 {

// Return the number of sections.
return 1;
}

 -(CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath
 {

return 150.0;

 }

 - (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
 {
 // Return the number of rows in the section.
return ( [finarray count] / 3 ); 
}


 - (UITableViewCell *) getCellContentView:(NSString *)cellIdentifier {

UITableViewCell *cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:cellIdentifier];

UILabel *tempLabel;
//UIImage *tempImage;

/* Create UI elements - Customize as you want your text to appear */

CGRect myFirstLabel = CGRectMake (65, 10, 200, 15);
CGRect mySecondLabel = CGRectMake (65, 25, 200, 15);
CGRect myThirdLabel = CGRectMake (65, 40, 200, 15);
 //  CGRect myImage = CGRectMake (10, 10, 50, 50);

//Initialize first label
tempLabel = [[UILabel alloc] initWithFrame: myFirstLabel];
tempLabel.tag = 1;
tempLabel.font = [UIFont boldSystemFontOfSize:12];
tempLabel.textColor = [UIColor lightGrayColor];
[cell.contentView addSubview: tempLabel];

//Initialize second label
tempLabel = [[UILabel alloc] initWithFrame: mySecondLabel];
tempLabel.tag = 2;
tempLabel.font = [UIFont boldSystemFontOfSize:12];
tempLabel.textColor = [UIColor lightGrayColor];
[cell.contentView addSubview: tempLabel];

//Initialize third label
tempLabel = [[UILabel alloc] initWithFrame: myThirdLabel];
tempLabel.tag = 3;
tempLabel.font = [UIFont boldSystemFontOfSize:12];
tempLabel.textColor = [UIColor lightGrayColor];
[cell.contentView addSubview: tempLabel];

//Initialize your picture
//imgTemp = [[UIImageView alloc] initWithFrame: myImage];
//imgTemp.tag = 4;
//[cell.contentView addSubview: tempImage];

return cell;
 }

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

UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];

if (cell == nil) {
    cell = [self getCellContentView: CellIdentifier];
}

//This will create the actual UI elements
UILabel *tempLabel1 = (UILabel *)[cell viewWithTag: 1];
UILabel *tempLabel2 = (UILabel *)[cell viewWithTag: 2];
UILabel *tempLabel3 = (UILabel *)[cell viewWithTag: 3];
//UIImageView *tempImage = (UIImageView *)[cell viewWithTag: 4];

// Populate the labels
NSString *firstText = [NSString stringWithString: [finarray objectAtIndex: 3*(indexPath.row)]];
NSString *secondText = [NSString stringWithString: [finarray objectAtIndex: 3*(indexPath.row) + 1]];
NSString *thirdText = [NSString stringWithString: [finarray objectAtIndex: 3*(indexPath.row) + 2]];

// Populate the picture
//UIImage *picture = [[UIImage alloc] initWithData:theObjectToPutInCell.picture];

tempLabel1.text = firstText;
tempLabel2.text = secondText;
tempLabel3.text = thirdText;

 // tempImage.image = picture;

return cell;  


}
}

@end

我的代码面临的问题是每个字符串都显示在每个单元格中，如果我插入任何新字符串，以前的内容就会消失，只显示新内容。

为了清楚地了解这个问题，我正在尝试为在线购物实现“添加到购物车”服务。根据概念，必须从各种产品中添加项目，并且它保存产品信息并且必须显示详细信息在 TableView 中。但我不明白..

请指导..提前致谢..

我的输出就像第一张图片

但我需要显示为在 Android 中完成的第二张图片..

Answer 1

这里有一些你可以尝试的东西:

创建一个像这样的函数来创建所有需要的图形元素:

// Cell appearence editing
- (UITableViewCell *) getCellContentView:(NSString *)cellIdentifier {

    UITableViewCell *cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:cellIdentifier];

    UILabel *tempLabel;
    UIImage *tempImage;

    /* Create UI elements - Customize as you want your text to appear */

    CGRect myFirstLabel = CGRectMake (65, 10, 200, 15);
    CGRect mySecondLabel = CGRectMake (65, 25, 200, 15);
    CGRect myThirdLabel = CGRectMake (65, 40, 200, 15);
    CGRect myImage = CGRectMake (10, 10, 50, 50);

    //Initialize first label
    tempLabel = [[UILabel alloc] initWithFrame: myFirstLabel];
    tempLabel.tag = 1;
    tempLabel.font = [UIFont boldSystemFontOfSize:12];
    tempLabel.textColor = [UIColor lightGrayColor];
    [cell.contentView addSubview: tempLabel];

    //Initialize second label
    tempLabel = [[UILabel alloc] initWithFrame: mySecondLabel];
    tempLabel.tag = 2;
    tempLabel.font = [UIFont boldSystemFontOfSize:12];
    tempLabel.textColor = [UIColor lightGrayColor];
    [cell.contentView addSubview: tempLabel];

    //Initialize third label
    tempLabel = [[UILabel alloc] initWithFrame: mySecondLabel];
    tempLabel.tag = 3;
    tempLabel.font = [UIFont boldSystemFontOfSize:12];
    tempLabel.textColor = [UIColor lightGrayColor];
    [cell.contentView addSubview: tempLabel];

    //Initialize your picture
    imgTemp = [[UIImageView alloc] initWithFrame: myImage];
    imgTemp.tag = 4;
    [cell.contentView addSubview: tempImage];

    return cell;
}

然后，在您的 cellForRowAtIndexPath 中，调用“设计函数”并用您的内容填充它:

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

    static NSString *CellIdentifier = @"aCell";

    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];

    if (cell == nil) {
        cell = [self getCellContentView: CellIdentifier];
    }

    //This will create the actual UI elements
    UILabel *tempLabel1 = (UILabel *)[cell viewWithTag: 1];
    UILabel *tempLabel2 = (UILabel *)[cell viewWithTag: 2];
    UILabel *tempLabel3 = (UILabel *)[cell viewWithTag: 3];
    UIImageView *tempImage = (UIImageView *)[cell viewWithTag: 4];

    // Populate the labels
    NSString *firstText = [NSString stringWithString: [finarray stringAtIndex: 3*(indexPath.row)]];
    NSString *secondText = [NSString stringWithString: [finarray stringAtIndex: 3*(indexPath.row) + 1]];
    NSString *thirdText = [NSString stringWithString: [finarray stringAtIndex: 3*(indexPath.row) + 2]];

    // Populate the picture
    UIImage *picture = [[UIImage alloc] initWithData:theObjectToPutInCell.picture];

    tempLabel1.text = firstText;
    tempLabel2.text = secondText;
    tempLabel3.text = thirdText;

    tempImage.image = picture;

    return cell;

}

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