sizeWithFont:constraintedToSize:已弃用,但boundingRectWithSize对我不起作用

时间:2014-09-05 11:21:13

标签: ios sizewithfont

好的,这就是我的困境,我有一块很好的代码块,它已被弃用,但它会计算任何文本块高度的合适大小。 (以下有效,但已弃用)

- (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath
{

if (indexPath.section == 0 && indexPath.row == 2) {

   CGSize size = [[item desc] sizeWithFont:[UIFont systemFontOfSize:17] constrainedToSize:CGSizeMake(290 - (10 * 2), 200000.0f)];

    CGFloat height = MAX(size.height, 44.0f);

    return height + (2 * 2);
}
return 44;
}

尝试删除已弃用的代码,因此我已经被困在正确的方法来修复它几天了,我想出了这个。

- (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath
{
if (indexPath.section == 0 && indexPath.row == 2) {

    NSStringDrawingContext *ctx = [NSStringDrawingContext new];
    NSAttributedString *aString = [[NSAttributedString alloc] initWithString:[item desc]];
    UITextView *calculationView = [[UITextView alloc] init];
    [calculationView setAttributedText:aString];
    CGRect textRect = [calculationView.text boundingRectWithSize:self.view.frame.size options:NSStringDrawingUsesLineFragmentOrigin attributes:@{NSFontAttributeName:calculationView.font} context:ctx];

    CGFloat height = MAX(textRect.size.height, 44.0f);
    return height + (2 * 2);

}
return 44;
}

这肯定不起作用,从代码级别的角度来看,它不会适当地调整单元格的大小。我觉得任何帮助都应该很容易。

2 个答案:

答案 0 :(得分:1)

试试这个:

CGRect textRect = [calculationView.text boundingRectWithSize:CGSizeMake(290 - (10 * 2), 200000.0f) 
                        options:NSStringDrawingUsesLineFragmentOrigin attributes:@{NSFontAttributeName:calculationView.font} context:ctx];

您没有提供所需的大小限制,因为您提供了弃用的方法。这就是为什么您没有获得所需的输出..

答案 1 :(得分:0)

只需编辑heightForRow方法,如:

- (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath
{
    if (indexPath.section == 0 && indexPath.row == 2)
    {
        NSStringDrawingContext *ctx = [NSStringDrawingContext new];
        NSAttributedString *aString = [[NSAttributedString alloc] initWithString:[item desc]];
        UITextView *calculationView = [[UITextView alloc] init];
        [calculationView setAttributedText:aString];
        [calculationView sizeToFit];
        //CGRect textRect = [calculationView.text boundingRectWithSize:self.view.frame.size options:NSStringDrawingUsesLineFragmentOrigin attributes:@{NSFontAttributeName:calculationView.font} context:ctx];

        CGFloat height = calculationView.frame.size.height; //MAX(textRect.size.height, 44.0f);
        NSLog(@"%.2f", calculationView.frame.size.height);
        return height + (2 * 2);
    }
    return 44;
}