iphone - 无法通过自定义方法从 UITableViewCell 获取值

Question

我正在创建一个应用程序，其中我有一个 UITableView 和 TableView ，每个单元格都有一个 UIView，UIView 包含两个自定义 UIButton 和两个 UILabel(都具有相同的标签)标签的值来自 XML 解析。现在我要做的是，当我单击任何一个按钮时，它会调用带有按钮标签的方法，然后我想获取该单元格的两个标签的值并使用该值。

但是当我这样做时，它不是通过调用方法发生的，我正在获取标签值，但是当我尝试获取标签值时，我无法获取。

有什么方法可以得到它的值吗？

我用来获取标签值的方法代码...

-(void)swapButtonPressed:(id)sender {
    NSInteger a= [sender tag];

    UITableViewCell *cell; 
    NSIndexPath *indexPath = [self.tableView indexPathForCell:(UITableViewCell *) [[sender superview] superview]];
    NSLog(@"%d", indexPath.row);

    UIView *viewForCell = (UIView *)[cell.contentView viewWithTag:a];

    UILabel *label = (UILabel *)[viewForCell viewWithTag:a];
    NSString *str = label.text;
}

cellForRowAtIndexPath 方法的代码....

- (UITableViewCell *)tableView:(UITableView *)tableView1 cellForRowAtIndexPath:(NSIndexPath *)indexPath {
    static NSString *identifier = @"Cell";
    UITableViewCell *cell = [tableView1 dequeueReusableCellWithIdentifier:identifier];
    if (cell == nil) {
        cell = [[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:identifier] autorelease];
    }
    cell.selectionStyle = UITableViewCellSelectionStyleNone;
    NSDictionary *dict = [appDelegate.webDataList objectAtIndex:indexPath.row];

    tableView.backgroundColor = [UIColor colorWithRed:0.39 green:0.39 blue:0.39 alpha:0.39];

    if([appDelegate.dataArray count]>0){

        imgView.backgroundColor = [UIColor clearColor];
        imgView =[[UIView alloc ] initWithFrame:CGRectMake(0,0,320,45)];
        imgView.tag= indexPath.row;
        [cell.contentView addSubview:imgView];

        button=[UIButton buttonWithType:UIButtonTypeCustom];
        button.frame=CGRectMake(291, 5, 19, 21);
        img =[UIImage imageWithContentsOfFile:[[NSBundle mainBundle] pathForResource:@"swap_re" ofType:@"png"]];
        [button setBackgroundImage:img forState:UIControlStateNormal];
        [button addTarget:self action:@selector(swapButtonPressed:) forControlEvents:UIControlEventTouchUpInside];
        button.tag= indexPath.row;
        [imgView addSubview:button];

        button=[UIButton buttonWithType:UIButtonTypeCustom];
        button.frame=CGRectMake(-25, 5, 19, 21);
        img =[UIImage imageWithContentsOfFile:[[NSBundle mainBundle] pathForResource:@"swap_re" ofType:@"png"]];
        [button setBackgroundImage:img forState:UIControlStateNormal];
        [button addTarget:self action:@selector(swapButtonPressed:) forControlEvents:UIControlEventTouchUpInside];
        button.tag= indexPath.row;
        [imgView addSubview:button];

        button=[UIButton buttonWithType:UIButtonTypeCustom];
        button.frame=CGRectMake(5, 7, 19, 21);
        button.tag = indexPath.row;
        img =[UIImage imageWithContentsOfFile:[[NSBundle mainBundle] pathForResource:@"delete" ofType:@"png"]];
        [button setBackgroundImage:img forState:UIControlStateNormal];
        [button addTarget:self action:@selector(deleteButtonPressed:) forControlEvents:UIControlEventTouchUpInside];    
        [imgView addSubview:button];

        NSArray *arr = [[appDelegate.dataArray objectAtIndex:indexPath.row] componentsSeparatedByString:@"/"];


        UILabel *label = [[UILabel alloc] initWithFrame:CGRectMake(34,9,140,20)];
        label.text = [arr objectAtIndex:1];
        label.tag = indexPath.row;
        [label setFont:[UIFont fontWithName:@"Georgia" size:14]];
        [label setNumberOfLines:0];
        label.textAlignment = UITextAlignmentLeft;
        label.textColor = [UIColor whiteColor];
        label.autoresizingMask = UIViewAutoresizingFlexibleLeftMargin | UIViewAutoresizingFlexibleHeight;
        label.backgroundColor = [UIColor clearColor];
        [imgView addSubview:label];
        [label release];


        label = [[UILabel alloc] initWithFrame:CGRectMake(181, 7, 75, 20)];
        label.tag = indexPath.row;
        label.text = [dict1 objectForKey:@"time"];
        [label setFont:[UIFont fontWithName:@"Georgia" size:16.0]];
        label.textAlignment = UITextAlignmentLeft;
        [label setBackgroundColor:[UIColor clearColor]];
        label.autoresizingMask = UIViewAutoresizingFlexibleLeftMargin | UIViewAutoresizingFlexibleHeight;
        [label setTextColor:[UIColor whiteColor]];
        [imgView addSubview:label];
        [label release];
    }
    return cell;
}

Answer 1

我看到两个问题:

1. 标签需要大于 0，因此您不能直接使用 indexPath.row。

2. 标签在父 View 中必须是唯一的

正如@Kenny 所建议的，从单元格获取indexPath 并直接访问数据源通常更可靠。如果您想从单元格中的对象获取值，请使用 > 0 的唯一标签。我通常为 subview 中的标签定义一个枚举以使内容更具可读性。