UITextView sizeThatFits返回的大小与boundingRectWithSize不同 [英] UITextView sizeThatFits returns different size than boundingRectWithSize

问题描述

需要 UITextView 所需的高度。 sizeThatFits 返回更大，但正确的高度超过 boundingRectWithSize 。为什么存在差异？

Need the required height of UITextView. sizeThatFits returns bigger, but the correct height than boundingRectWithSize. Why difference exist?

在两个地方我需要知道高度。在 cellForRowAtIndexPath 和 heightForRowAtIndexPath 中。

At two places I need to know the height. In cellForRowAtIndexPath and in heightForRowAtIndexPath.

我不认为在 heightForRowAtIndexPath中始终创建一个 UITextView 是有效的只知道需要什么样的高度。

I do not think it is efficient to create always a UITextView in heightForRowAtIndexPath just to know what height is required.

你知道计算 UITextView 在 heightForRowAtIndexPath ？

推荐答案

我上个月遇到了类似问题UITableView，我使用boundingRectWithSize来计算大小，它实际上是正确的。然后我将它放入UITextView。

I met similar problem last month for UITableView, and I use boundingRectWithSize to calculate the size, it is actually correct. I then put it into UITextView.

我犯了一些错误：

1. I忘记在计算时设置相同的字体大小和UITextView


2. UITextView有边距，我会手动将它添加到heightForRowAtIndexPath并将textContainerInset设置为相同的。

希望它可以帮到你。

-(CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath {
    NSInteger section = indexPath.section;
    NSUInteger axisIndex = section - 2;
    yAxis *yAxisObj = self.yAxisInfoArray[axisIndex];
    boundingRect = [yAxisObj.yAxisDescription boundingRectWithSize:CGSizeMake(self.descriptionViewWidth, CGFLOAT_MAX)
                                                           options:NSStringDrawingUsesLineFragmentOrigin|NSStringDrawingUsesFontLeading
                                                        attributes:@{NSFontAttributeName:self.contentFont}
                                                           context:nil];


    return boundingRect.size.height + TEXT_TOP_MARGIN + TEXT_BOTTOM_MARGIN;
}

-(UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
    static NSString *cellId = @"ChartDescriptionCell";
    ChartDescriptionCell *cell = [tableView dequeueReusableCellWithIdentifier:cellId];
    if (!cell) {
        cell = [[ChartDescriptionCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:cellId];
        cell.textView.bounces = NO;
        cell.textView.showsHorizontalScrollIndicator = NO;
        cell.textView.showsVerticalScrollIndicator = NO;
        cell.textView.font = self.contentFont;
        cell.textView.textColor = [UIColor colorWithHex:@"#333333"];
        cell.textView.textContainerInset = UIEdgeInsetsMake(TEXT_TOP_MARGIN, -5, TEXT_BOTTOM_MARGIN, -5);
    }
    NSInteger section = indexPath.section;
    NSUInteger axisIndex = section - 2;
    yAxis *yAxisObj = self.yAxisInfoArray[axisIndex];
    cell.textView.text = yAxisObj.yAxisDescription;
    }
    return cell;
}

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