如果标签包含 NSAttributed 字符串且部分字符串以粗体显示，如何获取标签的准确高度

发布于 2024-12-02 14:52:28 字数 506 浏览 0 评论 0原文

我目前正在使用以下方法来获取标签所需的高度，

+ (CGFloat) getHeightOfLabel:(NSString *)text ofFontSize:(CGFloat)fontSize withConstraint:(CGSize)constraint
{
    CGSize size = [text sizeWithFont:[UIFont systemFontOfSize:fontSize] constrainedToSize:constraint lineBreakMode:UILineBreakModeWordWrap];

    return size.height;
}

这在大多数情况下都有效，但是，有些字符串由粗体和非粗体文本混合组成，这可能会影响极端情况下所需的确切高度。

例如

在此处输入图像描述

有没有办法获得包含此混合物的标签的准确高度？

原文

I am currently using the following method to get the required height of the label

+ (CGFloat) getHeightOfLabel:(NSString *)text ofFontSize:(CGFloat)fontSize withConstraint:(CGSize)constraint
{
    CGSize size = [text sizeWithFont:[UIFont systemFontOfSize:fontSize] constrainedToSize:constraint lineBreakMode:UILineBreakModeWordWrap];

    return size.height;
}

This works in most cases, however, there are some strings which consist a mixture of bold and unbold text which might affect the exact height required in extreme cases.

For example

enter image description here

Are there any ways to get the accurate height of the label containing this mixture?

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风吹雪碎 2024-12-09 14:52:28

方法如下

UILabel *labelWithAtributedText = ...
CGSize size = [labelWithAtributedText sizeThatFits:CGSizeMake(maxWidth, CGFLOAT_MAX)];

Here's how

UILabel *labelWithAtributedText = ...
CGSize size = [labelWithAtributedText sizeThatFits:CGSizeMake(maxWidth, CGFLOAT_MAX)];

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丶视觉 2024-12-09 14:52:28

我也在为此苦苦挣扎。这里有一些想法：

使用boldSystemFontOfSize来计算高度，因为它将允许最大空间（在大多数情况下，这是最糟糕的情况。有些标签会比需要的高一点，但我发现这比被切断要好。）
计算 systemFontOfSize 和 boldSystemFontOfSize 之间的平均值

+ (CGFloat) getHeightOfLabel:(NSString *)text ofFontSize:(CGFloat)fontSize withConstraint:(CGSize)constraint  
{  
    CGSize size1 = [text sizeWithFont:[UIFont systemFontOfSize:fontSize] constrainedToSize:constraint lineBreakMode:UILineBreakModeWordWrap];  
    CGSize size2 = [text sizeWithFont:[UIFont boldSystemFontOfSize:fontSize] constrainedToSize:constraint lineBreakMode:UILineBreakModeWordWrap];  

    return (size1.height+size2.height)/2;  
}

如果您不需要实际高度，请使用 [label sizeToFit] 但我假设您需要这个高度:)

I was struggling with this as well. Here are a couple ideas:

Use boldSystemFontOfSize to calculate the height since it will allow for maximum room (In most cases, this worst well. Some labels will be a little taller than needed but I find it's better than getting cut off.)
Calculate the average between systemFontOfSize and boldSystemFontOfSize

+ (CGFloat) getHeightOfLabel:(NSString *)text ofFontSize:(CGFloat)fontSize withConstraint:(CGSize)constraint  
{  
    CGSize size1 = [text sizeWithFont:[UIFont systemFontOfSize:fontSize] constrainedToSize:constraint lineBreakMode:UILineBreakModeWordWrap];  
    CGSize size2 = [text sizeWithFont:[UIFont boldSystemFontOfSize:fontSize] constrainedToSize:constraint lineBreakMode:UILineBreakModeWordWrap];  

    return (size1.height+size2.height)/2;  
}

If you don't need the actual height use [label sizeToFit] but I'm assuming you need this height :)

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