iPhone在UITableViewController中的奇怪行为

问题描述:

我有一个UIView(称为:消息),与2 UILabel(标签,dataLabel)和1 UIButton(iconButton)的单元格。iPhone在UITableViewController中的奇怪行为

如果我释放dataLabel和iconButton,我会在运行时收到错误。如果我释放其他人没有发生问题。

你能帮我吗?

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

static NSString *CellIdentifier = @"Cell"; 

UIImageView *balloonView; 
UILabel *label; 
UIButton *iconButton; 
UILabel *dataLabel; 


UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier]; 

if (cell == nil) { 
    cell = [[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:@"cellID"] autorelease]; 
    cell.selectionStyle = UITableViewCellSelectionStyleNone; 
    tableView.separatorStyle = UITableViewCellSeparatorStyleNone; 

    UIView *message = [[UIView alloc] initWithFrame:CGRectMake(0.0, 0.0, cell.frame.size.width, cell.frame.size.height)]; 
    message.tag = 1; 

    dataLabel = [[UILabel alloc] initWithFrame:CGRectZero]; 
    dataLabel.backgroundColor = [UIColor clearColor]; 
    dataLabel.textColor = [UIColor darkGrayColor]; 
    dataLabel.tag = 2; 
    dataLabel.numberOfLines = 0; 
    dataLabel.lineBreakMode = UILineBreakModeWordWrap; 
    dataLabel.font = [UIFont systemFontOfSize:11.0]; 
    dataLabel.textAlignment = UITextAlignmentCenter; 
    dataLabel.opaque = YES; 

    balloonView = [[UIImageView alloc] initWithFrame:CGRectZero]; 
    balloonView.tag = 3; 
    balloonView.image = nil; 

    label = [[UILabel alloc] initWithFrame:CGRectZero]; 
    label.backgroundColor = [UIColor clearColor]; 
    label.tag = 4; 
    label.numberOfLines = 0; 
    label.lineBreakMode = UILineBreakModeWordWrap; 
    label.font = [UIFont systemFontOfSize:14.0]; 
    label.opaque = YES; 

    iconButton = [UIButton buttonWithType:UIButtonTypeCustom]; 
    iconButton.tag = 5; 

    [message addSubview:dataLabel]; 
    [message addSubview:balloonView]; 
    [message addSubview:label]; 
    [message addSubview:iconButton]; 

    [cell.contentView addSubview:message]; 

    [balloonView release]; 
    [label release]; 
    [message release]; 
} 
else { 
    dataLabel = (UILabel *)[[cell.contentView viewWithTag:0] viewWithTag:2]; 
    balloonView = (UIImageView *)[[cell.contentView viewWithTag:0] viewWithTag:3]; 
    label = (UILabel *)[[cell.contentView viewWithTag:0] viewWithTag:4]; 
    iconButton = (UIButton *)[[cell.contentView viewWithTag:0] viewWithTag:5]; 
} 

dataLabel.frame = CGRectMake(0,0,cell.frame.size.width,20); 
dataLabel.text = [NSString stringWithFormat:[[messages objectAtIndex:indexPath.row] valueForKey:DATE_TAG_NAME]]; 

UIImage *balloon; 

[...] 

balloonView.image = balloon;  

return cell;} 

谢谢!

你不需要释放iconButton作为它的autorelease对象。

只有在分配对象或保留对象时,才应释放对象。

我在发布dataLabel时看不到任何问题。尝试发布dataLabel并跳过释放iconButton,看看会发生什么。

很可能它只是由于释放iconButton,你不应该这样做,因为它是一个autorelease对象。