启用ARC时自定义单元内存泄漏

时间:2012-03-29 13:52:25

标签: memory-leaks uitableview automatic-ref-counting custom-cell

为什么启用ARC时会出现内存泄漏(以粗体突出显示)?

我有CustomCell.m

   +(CustomCell*)cell
{


    if ([[UIDevice currentDevice] userInterfaceIdiom] == UIUserInterfaceIdiomPhone) {
        NSArray *nib =[[NSBundle mainBundle] loadNibNamed:@"CustomCell_iPhone" owner:self options:nil];         
        return [nib objectAtIndex:0];

    } else {
        NSArray *nib =[[NSBundle mainBundle] loadNibNamed:@"CustomCell_iPad" owner:self options:nil];          **//leaking 100%**  
        return [nib objectAtIndex:0];

    }
}

在我的tableview conteroller中:

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
    cell=[CustomCell cell]; **// 100% leaking**
...
}

1 个答案:

答案 0 :(得分:1)

所以,有两件事。一,我收集你在.xib文件中创建这个单元格。在IB中的单元格上设置重用标识符。然后,代替这个CustomCell类方法,卸载tableView:cellForRowAtIndexPath:中的nib,如下所示:

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
    // Assuming you set a reuse identifier "cellId" in the nib for your table view cell...
    MyCell *cell = (MyCell *)[tableView dequeueReusableCellWithIdentifier:@"cellId"];
    if (!cell) {
        // If you didn't get a valid cell reference back, unload a cell from the nib
        NSArray *nibArray = [[NSBundle mainBundle] loadNibNamed:@"MyCell" owner:nil options:nil];
        for (id obj in nibArray) {
            if ([obj isMemberOfClass:[MyCell class]]) {
                // Assign cell to obj, and add a target action for the checkmark
                cell = (MyCell *)obj;
                break;
            }
        }
     }

     return cell;
}

第二件事是,通过首先尝试将可重复使用的单元格出列,您将获得更好的性能。