Ios 滚动时自定义UITableViewCell布局

我有一个自定义单元格的UITableView。因为我无法向标签添加约束，所以我尝试以编程方式进行此操作。现在，除了开始滚动外，一切都正常了。不知何故，layoutsubviews方法被忽略或重置

TableViewController.m

SubjectCell.m

使subjectLabel可公开访问，并在ViewController本身内更改其框架

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

    SubjectCell *cell = (SubjectCell *)[tableView dequeueReusableCellWithIdentifier:@"CellIdentifier"];

    cell.subjectLabel.text = [tentamenArray objectAtIndex:currentRow][@"SUMMARY"];

    CGSize screen = [UIScreen mainScreen].bounds.size;
    [cell.subjectLabel setFrame:CGRectMake(15, 15, screen.width - 70, 20)];

    return cell;
}

您是否尝试改为使用-voidPrepareforuse方法？

- (void) layoutSubviews {
    [super layoutSubviews];
    CGSize screen = [UIScreen mainScreen].bounds.size;
    [_subjectLabel setFrame:CGRectMake(15, 15, screen.width - 70, 20)];
}

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

    SubjectCell *cell = (SubjectCell *)[tableView dequeueReusableCellWithIdentifier:@"CellIdentifier"];

    cell.subjectLabel.text = [tentamenArray objectAtIndex:currentRow][@"SUMMARY"];

    CGSize screen = [UIScreen mainScreen].bounds.size;
    [cell.subjectLabel setFrame:CGRectMake(15, 15, screen.width - 70, 20)];

    return cell;
}