Question

我有UITableViewController。在＜code＞cellForRowAtIndexPath＜/code＞方法中，我为标签添加了自定义设置：

UILabel *lblMainLabel = [[UILabel alloc]initWithFrame:CGRectMake(50, 9, 150, 25)];
    lblMainLabel.text = c.Name;
    lblMainLabel.font = [UIFont fontWithName:@"Helvetica-Bold" size:20];
    lblMainLabel.backgroundColor = [UIColor clearColor];
    lblMainLabel.textColor = [UIColor whiteColor];
    [cell.contentView addSubview:lblMainLabel];
    [lblMainLabel release];

但当我在表格中向上或向下滚动时，它总是在之前的标签上添加这个标签，我错过了什么？

Answer 1

创建单元格时，应该只创建一次UILabel。

您的代码应该如下所示：

if (cell == nil) {
   cell = ...
   UILabel *lblMainLabel = [[UILabel alloc]initWithFrame:CGRectMake(50, 9, 150, 25)];
   lblMainLabel.tag = 42;
   lblMainLabel.font = [UIFont fontWithName:@"Helvetica-Bold" size:20];
   lblMainLabel.backgroundColor = [UIColor clearColor];
   lblMainLabel.textColor = [UIColor whiteColor];
   [cell.contentView addSubview:lblMainLabel];
   [lblMainLabel release];
}
UILabel *lblMainLabel = [cell viewWithTag:42];
lblMainLabel.text = c.Name;

Answer 2

Yes fluchtpunkt, you are right. cellForRowAtIndexPath gets fired every times the tableview scrolls, it will reloads the data.

if (cell == nil)
{

}

一旦单元格进行分配，就会被解雇。否则，内存也会增加。

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