Question

我为多个UIButtons添加了相同的选择器，它是UITableViewCell的一部分，仅适用于第一个选择器。我错过了什么吗？

这是我的代码：

- (void)tableView:(UITableView *)tableView willDisplayCell:(UITableViewCell *)cell forRowAtIndexPath:(NSIndexPath *)indexPath{

    NSDictionary *d = [tableData objectAtIndex:indexPath.row];
    NSArray *answers = [d objectForKey:@"answers"];//array of { id = 35; text = "\U03c4\U03a\U03c0\U03bf\U03c4\U03b1"; }

    UILabel *startDate = (UILabel *)[cell viewWithTag:100];
    long long startDateEpoch = [[d objectForKey:@"startDate"] longLongValue];
    NSDate *sDate = [NSDate dateWithTimeIntervalSince1970:startDateEpoch/1000];
    NSDateFormatter *startDateFormatter = [[NSDateFormatter alloc] init];
    [startDateFormatter setDateFormat:@"dd/MM/yyyy"];

    startDate.text = [startDateFormatter stringFromDate:sDate];

    ((UILabel *)[cell viewWithTag:101]).text = [d objectForKey:@"subject"];

    NSArray *tags = [d objectForKey:@"tags"];
    ((UILabel *)[cell viewWithTag:102]).text = [tags componentsJoinedByString:@" "];

    NSString *imageURL = [d objectForKey:@"media"];
    UIImageView *iv = (UIImageView *)[cell viewWithTag:103];
    iv.contentMode = UIViewContentModeScaleAspectFit;
    [iv sd_setImageWithURL:[NSURL URLWithString:imageURL]
          placeholderImage:[UIImage imageNamed:@"placeholder.png"]];

    UIView *buttonsContainer = (UIView *)[cell viewWithTag:104];
    for(UIView *vv in buttonsContainer.subviews){
        [vv removeFromSuperview];
    }
    int index = 0;
    NSLog(@"buttonsContainer children: %d", buttonsContainer.subviews.count);
    for(NSDictionary *answer in answers){
        UIView *v = [[UIView alloc] initWithFrame:CGRectMake(0, index * 40 + (index+1)*5, [UIScreen mainScreen].bounds.size.width, 40)];
        v.backgroundColor = [UIColor whiteColor];
        CGRect labelFrame = v.frame;
        labelFrame.origin.y = 0;
        UILabel *l = [[UILabel alloc] initWithFrame:labelFrame];
        l.text = (NSString *)[answer objectForKey:@"text"];
        l.textAlignment = NSTextAlignmentCenter;

        UIView *bottomLine = [[UIView alloc] initWithFrame:CGRectMake(0, v.frame.size.height - 1, v.frame.size.width, 1)];
        bottomLine.backgroundColor = [UIColor colorWithRed:238.0/255.0 green:205.0/255.0 blue:103.0/255.0 alpha:1.0];

        UIButton *b = [[UIButton alloc] initWithFrame:v.frame];

        [b addTarget:self action:@selector(answered:) forControlEvents:UIControlEventTouchUpInside];

        [v addSubview:l];
        [v addSubview:bottomLine];
        [v addSubview:b];
        [buttonsContainer addSubview:v];

        index++;
    }  
}

因此，例如，如果添加了4个按钮，则只有在单击第一个按钮时才会调用选择器。当我点击其他三个时，没有任何事情发生。

编辑：添加answered:代码：

- (void)answered:(UIButton *)sender
{
    NSLog(@"@answered");
}

Answer 1

好吧，我找到了。许多人对TomSwift的赞誉，因为他的观点让我想到了为所有视图设置边框以调试它们的帧大小和原点。

请注意，我向我的按钮提供与其超级视图相同的帧，这是错误的，因为它们不应具有相同的原点。按钮的原点应为0,0，因为它们的帧大小与其超级视图相同。

课程学习像我这样的新手：

当按钮不起作用时，请放置边框以确保其框架在超视图的范围内。
不要在视图及其子视图上指定相同的帧。它将把它放在超视图的界限之外，在92％的情况下会带来不良行为。

uitableviewcell中多个uibutton的选择器

1 个答案: