gpt4 book ai didi

swift - usedRectForTextContainer 大小错误与 NSAttributedString?

转载 作者:行者123 更新时间:2023-11-28 08:55:41 25 4
gpt4 key购买 nike

我试图通过以下过程计算 NSTextView 内容在设定宽度下所需的最小高度(其中 self 的实例NSTextView):

let currentWidth = self.frame.width
let textStorage = NSTextStorage(attributedString: self.attributedString())
let textContainer = NSTextContainer(containerSize: NSMakeSize(currentWidth, CGFloat.max))
let layoutManager = NSLayoutManager()
layoutManager.addTextContainer(textContainer)
textStorage.addLayoutManager(layoutManager)
layoutManager.glyphRangeForTextContainer(textContainer)
let newSize = layoutManager.usedRectForTextContainer(textContainer)
heightConstraint.constant = newSize.height

字符串本身是通过从 markdown 到 NSAttributedString 的转换创建的:

let data = styledHTML.dataUsingEncoding(NSUTF8StringEncoding, allowLossyConversion: false)
let attributed = try! NSAttributedString(data: data!, options: [
NSDocumentTypeDocumentAttribute: NSHTMLTextDocumentType
], documentAttributes: nil)
self.textStorage?.setAttributedString(attributed)

但是,问题是计算出的最小高度有 20 像素的偏差(灰色区域表示文本,红色区域表示 View ):

enter image description here

我认为这是 usedRectForTextContainer() 的问题,但是当我将 NSTextView 实例的 string 值设置为其他值时,即:

self.string = "Random string...\nTwo lines"
let currentWidth = self.frame.width
...

我得到正确的高度:

enter image description here

除了 this question,我在 Google 上没有发现任何有用的东西它有类似的问题,但没有解决方案。

可能值得注意的是,我通过一个非常简单的内联样式表来设置灰色背景:

*{
margin:0 !important;
padding:0 !important;
line-height:20px;
/*DEFAULT_FONT*/
/*DEFAULT_FONT_SIZE*/
background:grey;
}
em{
font-style:italic;
}

其中 /*DEFAULT_FONT*//*DEFAULT_FONT_SIZE*/ 在添加到 HTML 之前被交换为默认的 NSFont 值。


编辑:导致差异的不是生成的 HTML,因为它们具有完全相同的格式/样式:

原始字符串:

<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<meta http-equiv="Content-Style-Type" content="text/css">
<title></title>
<meta name="Generator" content="Cocoa HTML Writer">
<meta name="CocoaVersion" content="1404.11">
<style type="text/css">
p.p1 {margin: 0.0px 0.0px 0.0px 0.0px; line-height: 20.0px; font: 13.0px 'Helvetica Neue'; color: #0000ee; -webkit-text-stroke: #0000ee; background-color: #808080}
span.s1 {text-decoration: underline ; font-kerning: none}
</style>
</head>
<body>
<p class="p1"><span class="s1"><a href="http://www.native-languages.org/houses.htm">http://www.native-languages.org/houses.htm</a></span></p>
<p class="p1"><span class="s1"><a href="https://www.youtube.com/watch?v=1oU6__m8To4">https://www.youtube.com/watch?v=1oU6__m8To4</a></span></p>
</body>
</html>

随机字符串:

<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<meta http-equiv="Content-Style-Type" content="text/css">
<title></title>
<meta name="Generator" content="Cocoa HTML Writer">
<meta name="CocoaVersion" content="1404.11">
<style type="text/css">
p.p1 {margin: 0.0px 0.0px 0.0px 0.0px; line-height: 20.0px; font: 13.0px 'Helvetica Neue'; color: #0000ee; -webkit-text-stroke: #0000ee; background-color: #808080}
span.s1 {text-decoration: underline ; font-kerning: none}
</style>
</head>
<body>
<p class="p1"><span class="s1"><a href="http://www.native-languages.org/houses.htm">F</a></span></p>
</body>
</html>

最佳答案

这有点尴尬!进一步测试后,我注意到 self.attributedString().string 值有一个尾随换行符 \n,它一定是在从 HTML 转换期间创建的到 NSAttributedString。我是这样补救的:

let data = styledHTML.dataUsingEncoding(NSUTF8StringEncoding, allowLossyConversion: false)
let attributed = try! NSMutableAttributedString(data: data!, options: [
NSDocumentTypeDocumentAttribute: NSHTMLTextDocumentType
], documentAttributes: nil)
let lastCharacterRange = NSMakeRange(commentString.length - 1, 1)
let lastCharacter = self.attributedSubstringFromRange(lastCharacterRange)
if lastCharacter.string == "\n" {
self.deleteCharactersInRange(lastCharacterRange)
}

基本上,我将 NSAttributedString 更改为 NSMutableAttributedString,允许我通过 deleteCharactersInRange 删除最后一个字符。

关于swift - usedRectForTextContainer 大小错误与 NSAttributedString?,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/33140284/

25 4 0
Copyright 2021 - 2024 cfsdn All Rights Reserved 蜀ICP备2022000587号
广告合作:1813099741@qq.com 6ren.com