从 html 创建 nsattributedstring 时，ios7 字体大小会发生变化 [英] ios7 font size change when create nsattributedstring from html
问题描述
我有一个 UITextView，我在其中管理一个 NSAttributedString，最初是通过键盘正常输入的.我将属性字符串保存为 HTML，看起来不错.当我再次加载它并将其从 HTML 转换回属性字符串时，字体大小似乎发生了变化.
I have a UITextView where I'm managing an NSAttributedString, initially entered as normal via the keyboard. I save the attributed string as HTML, which looks fine. When I load it again, and convert it back to an attributed string from the HTML, the font size appears to change.
例如，加载时的 HTML 如下所示:
For example, the HTML on loading looks like this:
<!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">
<style type="text/css">
p.p1 {margin: 0.0px 0.0px 0.0px 0.0px; font: 21.0px Helvetica; color: #000000; -webkit-text- stroke: #000000}
span.s1 {font-family: 'Helvetica'; font-weight: normal; font-style: normal; font-size: 21.00pt; font-kerning: none}
</style>
</head>
<body>
<p class="p1"><span class="s1">There is some text as usual lots of text</span></p>
</body>
</html>
我转换它并使用以下代码检查属性:
I convert it and check the attributes with the following code:
// convert to attributed string
NSError *err;
NSAttributedString *as = [[NSAttributedString alloc] initWithData:data3
options:@{NSDocumentTypeDocumentAttribute: NSHTMLTextDocumentType,
NSCharacterEncodingDocumentAttribute: @(NSUTF8StringEncoding)}
documentAttributes:nil
error:&err] ;
NSMutableAttributedString *res = [as mutableCopy];
[res enumerateAttribute:NSFontAttributeName inRange:NSMakeRange(0, res.length) options:0 usingBlock:^(id value, NSRange range, BOOL *stop) {
if (value) {
UIFont *oldFont = (UIFont *)value;
NSLog(@"On Loading: Font size %f, in range from %d length %d", oldFont.pointSize, range.location, range.length);
}
}];
输出显示字体大小从21增加到28:
The output shows that the font size has increased from 21 to 28:
On Loading: Font size 28.000000, in range from 0 length 40
On Loading: Font size 21.000000, in range from 40 length 1
基本上，每次加载字符串时，字体大小都会增加.我需要将它存储为 HTML 而不是 NSData 因为它也将被其他平台使用.
Basically, each time I load the string, the font size increases. I need to store it as HTML rather than as NSData because it will also be used by other platforms.
有人知道为什么会这样吗?
Does anyone have any ideas why this is happening?
推荐答案
我也遇到了这个问题，我通过迭代到属性并重置旧字体大小来修复它，如下所示
I also faced this issue, I fixed it by iterating to the attributes and reseting the old font size as follows
NSMutableAttributedString *res = [attributedText mutableCopy];
[res beginEditing];
[res enumerateAttribute:NSFontAttributeName
inRange:NSMakeRange(0, res.length)
options:0
usingBlock:^(id value, NSRange range, BOOL *stop) {
if (value) {
UIFont *oldFont = (UIFont *)value;
UIFont *newFont = [oldFont fontWithSize:15];
[res addAttribute:NSFontAttributeName value:newFont range:range];
}
}];
[res endEditing];
[self.textFileInputView setAttributedText:res];
这篇关于从 html 创建 nsattributedstring 时，ios7 字体大小会发生变化的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
