计算包含HTML的NSAttributedString的高度

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问题描述

我正在使用nsattribatedstring使用以下代码显示HTML文本.

do {
    let html = "<span style=\"font-family: Montserrat-ExtraLight; font-size: 14; line-height: 1.5;\">\(clinic.profile!)</span>"
    let clinicProfile = try NSAttributedString(
        data: (html.data(using: String.Encoding.unicode, allowLossyConversion: true)!),
        options: [
            NSDocumentTypeDocumentAttribute : NSHTMLTextDocumentType
        ],
        documentAttributes: nil
    )
    contentView.attributedText = clinicProfile
    scrollView.addSubview(contentView)
} catch {
    print(error)
}

我现在想计算字符串的高度，在html中，我正在使用html标签，例如p, strong, em, ul > li, ol > li.

我尝试了以下代码.

let size = CGSize(width: view.frame.width, height: 2000)
let boundingBox = contentView.attributedText.boundingRect(
    with: size,
    options: [.usesLineFragmentOrigin, .usesFontLeading, .usesDeviceMetrics],
    context: nil
)
print(boundingBox.height)

这将返回462的实际高度要比实际高度要少，如何正确计算此高度?

谢谢.

推荐答案

我的解决方案确实有效，问题是我错误地设置了卷轴的大小，固定滚动视图的高度解决了我的问题.

let size = CGSize(width: view.frame.width, height: 2000)
let boundingBox = contentView.attributedText.boundingRect(
    with: size,
    options: [.usesLineFragmentOrigin, .usesFontLeading, .usesDeviceMetrics],
    context: nil
)
print(boundingBox.height)

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问题描述

I am using NSAttributedString to display HTML text using the following code.

do {
    let html = "<span style=\"font-family: Montserrat-ExtraLight; font-size: 14; line-height: 1.5;\">\(clinic.profile!)</span>"
    let clinicProfile = try NSAttributedString(
        data: (html.data(using: String.Encoding.unicode, allowLossyConversion: true)!),
        options: [
            NSDocumentTypeDocumentAttribute : NSHTMLTextDocumentType
        ],
        documentAttributes: nil
    )
    contentView.attributedText = clinicProfile
    scrollView.addSubview(contentView)
} catch {
    print(error)
}

I now want to calculate the height of the string, In the HTML, I am using the HTML tags such as p, strong, em, ul > li, ol > li.

I tried the following code.

let size = CGSize(width: view.frame.width, height: 2000)
let boundingBox = contentView.attributedText.boundingRect(
    with: size,
    options: [.usesLineFragmentOrigin, .usesFontLeading, .usesDeviceMetrics],
    context: nil
)
print(boundingBox.height)

This returns 462 which is way lesser then actual height, how to correctly calculate the height for this?

Thanks.

推荐答案

My solution did work, The problem was that I was incorrectly setting the size of scrollview, fixing the height of scroll view fixed my problem.

let size = CGSize(width: view.frame.width, height: 2000)
let boundingBox = contentView.attributedText.boundingRect(
    with: size,
    options: [.usesLineFragmentOrigin, .usesFontLeading, .usesDeviceMetrics],
    context: nil
)
print(boundingBox.height)

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