重复重叠tableview单元

tableView单元在滚动时重复，并且与其他的互相重叠，应该怎么修复？

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
    return 11;
}

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
    UIButton *buyBtn = [UIButton buttonWithType:UIButtonTypeCustom];
    UIImageView *img;
    UILabel *lbl;
    UIImageView *backImage;
    UILabel *textLabel;
    UILabel *detailTextLabel;

    NSInteger val = [indexPath row] * 3;

    if (UI_USER_INTERFACE_IDIOM() == UIUserInterfaceIdiomPad)
    {
        backImage =  [[UIImageView alloc] initWithFrame:CGRectMake(2, 4, 316, 62)];
        [buyBtn setFrame:CGRectMake(257, 35, 57, 24)];
        img = [[UIImageView alloc] initWithFrame:CGRectMake(257, 10, 57, 24)];

        lbl = [[UILabel alloc] initWithFrame:CGRectMake(0, 0, 57, 24)];
        textLabel = [[UILabel alloc] initWithFrame:CGRectMake(4, 4, 230, 25)];
        detailTextLabel = [[UILabel alloc] initWithFrame:CGRectMake(4, 25, 230, 30)];

        backImage.image = [UIImage imageNamed:@"shop-bg.png"];
        [buyBtn setImage:[UIImage imageNamed:@"buy_button"] forState:UIControlStateNormal];
        [img setImage:[UIImage imageNamed:@"price_button.png"]];
    }
    else
    {
        backImage =  [[UIImageView alloc] initWithFrame:CGRectMake(2, 4, 316, 62)];
        [buyBtn setFrame:CGRectMake(257, 35, 57, 24)];
        img = [[UIImageView alloc] initWithFrame:CGRectMake(257, 10, 57, 24)];

        lbl = [[UILabel alloc] initWithFrame:CGRectMake(0, 0, 57, 24)];
        textLabel = [[UILabel alloc] initWithFrame:CGRectMake(4, 4, 230, 25)];
        detailTextLabel = [[UILabel alloc] initWithFrame:CGRectMake(4, 25, 230, 30)];

        backImage.image = [UIImage imageNamed:@"shop-bg.png"];
        [buyBtn setImage:[UIImage imageNamed:@"buy_button"] forState:UIControlStateNormal];
        [img setImage:[UIImage imageNamed:@"price_button.png"]];
    }



    lbl.center = img.center;
    lbl.textAlignment =  UITextAlignmentCenter;
    lbl.text = [self.original_List objectAtIndex:val+2];
    lbl.backgroundColor = [UIColor clearColor];

    textLabel.font = [UIFont fontWithName:@"Arial Rounded MT Bold" size:14];
    textLabel.backgroundColor = [UIColor clearColor];
    textLabel.text = [self.original_List objectAtIndex:val];

    detailTextLabel.text = [self.original_List objectAtIndex:val+1];
    detailTextLabel.backgroundColor = [UIColor clearColor];
    detailTextLabel.font = [UIFont fontWithName:@"Arial Rounded MT Bold" size:10];
    textLabel.textColor = [UIColor blackColor];
    detailTextLabel.textColor = [UIColor whiteColor];
    detailTextLabel.numberOfLines = 2;

    [buyBtn setTag:[indexPath row]];
    [buyBtn addTarget:self action:@selector(buyBtnPressed:) forControlEvents:UIControlEventTouchDown];



    static NSString *myIdentifier = @"myIdentifier";
    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:myIdentifier];
    NSLog(@"%d" , [[cell subviews] count]);
    if (cell == nil)
    {
        cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:myIdentifier];
    }
             cell.accessoryType = UITableViewCellAccessoryNone;
        [cell setSelectionStyle:UITableViewCellEditingStyleNone];
        cell.backgroundColor = [UIColor clearColor];

    [cell.contentView addSubview:backImage];
    [cell.contentView addSubview:detailTextLabel];
    [cell.contentView addSubview:textLabel];
    [cell.contentView addSubview:buyBtn];
    [cell.contentView addSubview:img];
    [cell.contentView addSubview:lbl];
    return cell;
}

改为下面的代码就解决了，呵呵

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
    UIButton *buyBtn = [UIButton buttonWithType:UIButtonTypeCustom];
    UIImageView *img;
    UILabel *lbl;
    UIImageView *backImage;
    UILabel *textLabel;
    UILabel *detailTextLabel;

    NSInteger val = [indexPath row] * 3;

    if (UI_USER_INTERFACE_IDIOM() == UIUserInterfaceIdiomPad)
    {
        backImage =  [[UIImageView alloc] initWithFrame:CGRectMake(2, 4, 316, 62)];
        [buyBtn setFrame:CGRectMake(257, 35, 57, 24)];
        img = [[UIImageView alloc] initWithFrame:CGRectMake(257, 10, 57, 24)];

        lbl = [[UILabel alloc] initWithFrame:CGRectMake(0, 0, 57, 24)];
        textLabel = [[UILabel alloc] initWithFrame:CGRectMake(4, 4, 230, 25)];
        detailTextLabel = [[UILabel alloc] initWithFrame:CGRectMake(4, 25, 230, 30)];

        backImage.image = [UIImage imageNamed:@"shop-bg.png"];
        [buyBtn setImage:[UIImage imageNamed:@"buy_button"] forState:UIControlStateNormal];
        [img setImage:[UIImage imageNamed:@"price_button.png"]];
    }
    else
    {
        backImage =  [[UIImageView alloc] initWithFrame:CGRectMake(2, 4, 316, 62)];
        [buyBtn setFrame:CGRectMake(257, 35, 57, 24)];
        img = [[UIImageView alloc] initWithFrame:CGRectMake(257, 10, 57, 24)];

        lbl = [[UILabel alloc] initWithFrame:CGRectMake(0, 0, 57, 24)];
        textLabel = [[UILabel alloc] initWithFrame:CGRectMake(4, 4, 230, 25)];
        detailTextLabel = [[UILabel alloc] initWithFrame:CGRectMake(4, 25, 230, 30)];

        backImage.image = [UIImage imageNamed:@"shop-bg.png"];
        [buyBtn setImage:[UIImage imageNamed:@"buy_button"] forState:UIControlStateNormal];
        [img setImage:[UIImage imageNamed:@"price_button.png"]];
    }



    lbl.center = img.center;
    lbl.textAlignment =  UITextAlignmentCenter;
    lbl.text = [self.original_List objectAtIndex:val+2];
    lbl.backgroundColor = [UIColor clearColor];

    textLabel.font = [UIFont fontWithName:@"Arial Rounded MT Bold" size:14];
    textLabel.backgroundColor = [UIColor clearColor];
    textLabel.text = [self.original_List objectAtIndex:val];

    detailTextLabel.text = [self.original_List objectAtIndex:val+1];
    detailTextLabel.backgroundColor = [UIColor clearColor];
    detailTextLabel.font = [UIFont fontWithName:@"Arial Rounded MT Bold" size:10];
    textLabel.textColor = [UIColor blackColor];
    detailTextLabel.textColor = [UIColor whiteColor];
    detailTextLabel.numberOfLines = 2;

    [buyBtn setTag:[indexPath row]];
    [buyBtn addTarget:self action:@selector(buyBtnPressed:) forControlEvents:UIControlEventTouchDown];



    static NSString *myIdentifier = @"myIdentifier";
    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:myIdentifier];
    NSLog(@"%d" , [[cell subviews] count]);
    //if (cell == nil)
    {
        cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:myIdentifier];
    }
             cell.accessoryType = UITableViewCellAccessoryNone;
        [cell setSelectionStyle:UITableViewCellEditingStyleNone];
        cell.backgroundColor = [UIColor clearColor];

    [cell.contentView addSubview:backImage];
    [cell.contentView addSubview:detailTextLabel];
    [cell.contentView addSubview:textLabel];
    [cell.contentView addSubview:buyBtn];
    [cell.contentView addSubview:img];
    [cell.contentView addSubview:lbl];
    return cell;
}

不要用reuseIdentifier

UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:nil];
    if (cell == nil)
    {
        cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleSubtitle reuseIdentifier:nil];


    }