我想，也都是HTML格式，以在一个UITableViewCell的iPhone完美呈现的文本片段。
到目前为止，我有这样的：
NSError* error;
NSString* source = @"<strong>Nice</strong> try, Phil";
NSMutableAttributedString* str = [[NSMutableAttributedString alloc] initWithData:[source dataUsingEncoding:NSUTF8StringEncoding]
options:@{NSDocumentTypeDocumentAttribute: NSHTMLTextDocumentType,
NSCharacterEncodingDocumentAttribute: [NSNumber numberWithInt:NSUTF8StringEncoding]}
documentAttributes:nil error:&error];
这类作品。我得到的粗体有“好”一些文本！但是......这也将字体是罗马时代！这不是字型我想要的。我想我需要设置在documentAttributes的东西，但是，我找不到任何例子的任何地方。
#import "UILabel+HTML.h"
@implementation UILabel (HTML)
- (void)jaq_setHTMLFromString:(NSString *)string {
string = [string stringByAppendingString:[NSString stringWithFormat:@"<style>body{font-family: '%@'; font-size:%fpx;}</style>",
self.font.fontName,
self.font.pointSize]];
self.attributedText = [[NSAttributedString alloc] initWithData:[string dataUsingEncoding:NSUnicodeStringEncoding]
options:@{NSDocumentTypeDocumentAttribute: NSHTMLTextDocumentType,
NSCharacterEncodingDocumentAttribute: @(NSUTF8StringEncoding)}
documentAttributes:nil
error:nil];
}
@end
这样，您就不需要指定你想要的字体，它会带标签的字体和大小。
NSHTMLTextDocumentType的使用是缓慢的，难以控制的风格。我建议你试试我的图书馆被称为Atributika。它有自己非常快的解析器。你也可以有任何标记名称和定义任何风格的他们。
例：
let str = "<strong>Nice</strong> try, Phil".style(tags:
Style("strong").font(.boldSystemFont(ofSize: 15))).attributedString
label.attributedText = str
感谢您的答案，我真的很喜欢的扩展，但我还没有转化为迅速呢。对于那些老高中生仍然在Objective-C这应该有点帮助：d
-(void) setBaseFont:(UIFont*)font preserveSize:(BOOL) bPreserve {
UIFontDescriptor *baseDescriptor = font.fontDescriptor;
[self enumerateAttribute:NSFontAttributeName inRange:NSMakeRange(0, [self length]) options:0 usingBlock:^(id _Nullable value, NSRange range, BOOL * _Nonnull stop) {
UIFont *font = (UIFont*)value;
UIFontDescriptorSymbolicTraits traits = font.fontDescriptor.symbolicTraits;
UIFontDescriptor *descriptor = [baseDescriptor fontDescriptorWithSymbolicTraits:traits];
UIFont *newFont = [UIFont fontWithDescriptor:descriptor size:bPreserve?baseDescriptor.pointSize:descriptor.pointSize];
[self removeAttribute:NSFontAttributeName range:range];
[self addAttribute:NSFontAttributeName value:newFont range:range];
}]; }
编码快乐！ --Greg框架
迅速3字符串扩展包括零字体。没有字体的属性从其他SO问题采取的，不记得哪一个:(
extension String {
var html2AttributedString: NSAttributedString? {
guard let data = data(using: .utf8) else {
return nil
}
do {
return try NSAttributedString(data: data, options: [NSDocumentTypeDocumentAttribute: NSHTMLTextDocumentType, NSCharacterEncodingDocumentAttribute: String.Encoding.utf8.rawValue], documentAttributes: nil)
}
catch {
print(error.localizedDescription)
return nil
}
}
public func getHtml2AttributedString(font: UIFont?) -> NSAttributedString? {
guard let font = font else {
return html2AttributedString
}
let modifiedString = "<style>body{font-family: '\(font.fontName)'; font-size:\(font.pointSize)px;}</style>\(self)";
guard let data = modifiedString.data(using: .utf8) else {
return nil
}
do {
return try NSAttributedString(data: data, options: [NSDocumentTypeDocumentAttribute: NSHTMLTextDocumentType, NSCharacterEncodingDocumentAttribute: String.Encoding.utf8.rawValue], documentAttributes: nil)
}
catch {
print(error)
return nil
}
}
}
拼接大家的答案，我做了两个扩展，允许设置一个标签采用HTML文本。一些答案上面没有正确解释字体家族的归属字符串。其他的不全，我的需要或者以其他方式失败。让我知道如果有什么事，你想我提高。
我希望这可以帮助别人。
extension UILabel {
/// Sets the label using the supplied html, using the label's font and font size as a basis.
/// For predictable results, using only simple html without style sheets.
/// See https://stackoverflow.com/questions/19921972/parsing-html-into-nsattributedtext-how-to-set-font
///
/// - Returns: Whether the text could be converted.
@discardableResult func setAttributedText(fromHtml html: String) -> Bool {
guard let data = html.data(using: .utf8, allowLossyConversion: true) else {
print(">>> Could not create UTF8 formatted data from \(html)")
return false
}
do {
let mutableText = try NSMutableAttributedString(
data: data,
options: [NSAttributedString.DocumentReadingOptionKey.documentType: NSAttributedString.DocumentType.html, NSAttributedString.DocumentReadingOptionKey.characterEncoding: String.Encoding.utf8.rawValue],
documentAttributes: nil)
mutableText.replaceFonts(with: font)
self.attributedText = mutableText
return true
} catch (let error) {
print(">>> Could not create attributed text from \(html)\nError: \(error)")
return false
}
}
}
extension NSMutableAttributedString {
/// Replace any font with the specified font (including its pointSize) while still keeping
/// all other attributes like bold, italics, spacing, etc.
/// See https://stackoverflow.com/questions/19921972/parsing-html-into-nsattributedtext-how-to-set-font
func replaceFonts(with font: UIFont) {
let baseFontDescriptor = font.fontDescriptor
var changes = [NSRange: UIFont]()
enumerateAttribute(.font, in: NSMakeRange(0, length), options: []) { foundFont, range, _ in
if let htmlTraits = (foundFont as? UIFont)?.fontDescriptor.symbolicTraits,
let adjustedDescriptor = baseFontDescriptor.withSymbolicTraits(htmlTraits) {
let newFont = UIFont(descriptor: adjustedDescriptor, size: font.pointSize)
changes[range] = newFont
}
}
changes.forEach { range, newFont in
removeAttribute(.font, range: range)
addAttribute(.font, value: newFont, range: range)
}
}
}
事实上，一个更方便，更cleanr方式中存在。只需设置字体解析HTML后：
NSMutableAttributedString *text = [[NSMutableAttributedString alloc] initWithData:[htmlString dataUsingEncoding:NSUTF8StringEncoding]
options:@{
NSDocumentTypeDocumentAttribute: NSHTMLTextDocumentType,
NSCharacterEncodingDocumentAttribute: @(NSUTF8StringEncoding)}
documentAttributes:nil error:nil];
[text addAttributes:@{NSFontAttributeName: [UIFont fontWithName:@"Lato-Regular" size:20]} range:NSMakeRange(0, text.length)];
斯威夫特版本的基础上，通过答案给出Javier Querol
extension UILabel {
func setHTMLFromString(text: String) {
let modifiedFont = NSString(format:"<span style=\"font-family: \(self.font!.fontName); font-size: \(self.font!.pointSize)\">%@</span>", text) as String
let attrStr = try! NSAttributedString(
data: modifiedFont.dataUsingEncoding(NSUnicodeStringEncoding, allowLossyConversion: true)!,
options: [NSDocumentTypeDocumentAttribute: NSHTMLTextDocumentType, NSCharacterEncodingDocumentAttribute: NSUTF8StringEncoding],
documentAttributes: nil)
self.attributedText = attrStr
}
}
雨燕3.0和iOS 9+
extension UILabel {
func setHTMLFromString(htmlText: String) {
let modifiedFont = String(format:"<span style=\"font-family: '-apple-system', 'HelveticaNeue'; font-size: \(self.font!.pointSize)\">%@</span>", htmlText)
//process collection values
let attrStr = try! NSAttributedString(
data: modifiedFont.data(using: .unicode, allowLossyConversion: true)!,
options: [NSDocumentTypeDocumentAttribute: NSHTMLTextDocumentType, NSCharacterEncodingDocumentAttribute: String.Encoding.utf8.rawValue],
documentAttributes: nil)
self.attributedText = attrStr
}
}
我居然发现一个工作解决了这个问题：
改变你的HTML响应字符串的字体也被解析之前。
NSString *aux = [NSString stringWithFormat:@"<span style=\"font-family: YOUR_FONT_NAME; font-size: SIZE\">%@</span>", htmlResponse];
例：
NSString *aux = [NSString stringWithFormat:@"<span style=\"font-family: HelveticaNeue-Thin; font-size: 17\">%@</span>", [response objectForKey:@"content"]];
斯威夫特版本：
let aux = "<span style=\"font-family: YOUR_FONT_NAME; font-size: SIZE\">\(htmlResponse)</span>"
弄清楚了。熊的一点，也许不是最好的答案。
此代码将通过所有的字体变化。我知道这是用“宋体”和“Times New Roman字体BoldMT”的字体。但无论如何，这将找到字体加粗，让我重新设置。而我在这我也可以重新设置大小。
我真的希望/觉得有一种方法，在分析时对此进行设置，但我不能找到它，如果存在。
NSRange range = (NSRange){0,[str length]};
[str enumerateAttribute:NSFontAttributeName inRange:range options:NSAttributedStringEnumerationLongestEffectiveRangeNotRequired usingBlock:^(id value, NSRange range, BOOL *stop) {
UIFont* currentFont = value;
UIFont *replacementFont = nil;
if ([currentFont.fontName rangeOfString:@"bold" options:NSCaseInsensitiveSearch].location != NSNotFound) {
replacementFont = [UIFont fontWithName:@"HelveticaNeue-CondensedBold" size:25.0f];
} else {
replacementFont = [UIFont fontWithName:@"HelveticaNeue-Thin" size:25.0f];
}
[str addAttribute:NSFontAttributeName value:replacementFont range:range];
}];
一个更通用的方法是看字体的特征，同时列举，并创建具有相同的特征（粗体，斜体等）的字体：
extension NSMutableAttributedString {
/// Replaces the base font (typically Times) with the given font, while preserving traits like bold and italic
func setBaseFont(baseFont: UIFont, preserveFontSizes: Bool = false) {
let baseDescriptor = baseFont.fontDescriptor
let wholeRange = NSRange(location: 0, length: length)
beginEditing()
enumerateAttribute(.font, in: wholeRange, options: []) { object, range, _ in
guard let font = object as? UIFont else { return }
// Instantiate a font with our base font's family, but with the current range's traits
let traits = font.fontDescriptor.symbolicTraits
guard let descriptor = baseDescriptor.withSymbolicTraits(traits) else { return }
let newSize = preserveFontSizes ? descriptor.pointSize : baseDescriptor.pointSize
let newFont = UIFont(descriptor: descriptor, size: newSize)
self.removeAttribute(.font, range: range)
self.addAttribute(.font, value: newFont, range: range)
}
endEditing()
}
}
是的，有一个简单的解决方案。设置字体在HTML源代码！
NSError* error;
NSString* source = @"<strong>Nice</strong> try, Phil";
source = [source stringByAppendingString:@"<style>strong{font-family: 'Avenir-Roman';font-size: 14px;}</style>"];
NSMutableAttributedString* str = [[NSMutableAttributedString alloc] initWithData:[source dataUsingEncoding:NSUTF8StringEncoding]
options:@{NSDocumentTypeDocumentAttribute: NSHTMLTextDocumentType,
NSCharacterEncodingDocumentAttribute: [NSNumber numberWithInt:NSUTF8StringEncoding]}
documentAttributes:nil error:&error];
希望这可以帮助。
斯威夫特4+的UILabel扩展的更新
extension UILabel {
func setHTMLFromString(text: String) {
let modifiedFont = NSString(format:"<span style=\"font-family: \(self.font!.fontName); font-size: \(self.font!.pointSize)\">%@</span>" as NSString, text)
let attrStr = try! NSAttributedString(
data: modifiedFont.data(using: String.Encoding.unicode.rawValue, allowLossyConversion: true)!,
options: [NSAttributedString.DocumentReadingOptionKey.documentType:NSAttributedString.DocumentType.html, NSAttributedString.DocumentReadingOptionKey.characterEncoding: String.Encoding.utf8.rawValue],
documentAttributes: nil)
self.attributedText = attrStr
}
}
iOS版9+
extension UILabel {
func setHTMLFromString(htmlText: String) {
let modifiedFont = NSString(format:"<span style=\"font-family: '-apple-system', 'HelveticaNeue'; font-size: \(self.font!.pointSize)\">%@</span>" as NSString, htmlText) as String
//process collection values
let attrStr = try! NSAttributedString(
data: modifiedFont.data(using: .unicode, allowLossyConversion: true)!,
options: [NSAttributedString.DocumentReadingOptionKey.documentType:NSAttributedString.DocumentType.html, NSAttributedString.DocumentReadingOptionKey.characterEncoding: String.Encoding.utf8.rawValue],
documentAttributes: nil)
self.attributedText = attrStr
}
}
上述所有问题的答案工作确定，如果你在同一时间做转换为创建NSAttributedString。但我认为，一个更好的解决方案，它适用于字符串本身，因此并不需要访问输入，如下类别：
extension NSMutableAttributedString
{
func convertFontTo(font: UIFont)
{
var range = NSMakeRange(0, 0)
while (NSMaxRange(range) < length)
{
let attributes = attributesAtIndex(NSMaxRange(range), effectiveRange: &range)
if let oldFont = attributes[NSFontAttributeName]
{
let newFont = UIFont(descriptor: font.fontDescriptor().fontDescriptorWithSymbolicTraits(oldFont.fontDescriptor().symbolicTraits), size: font.pointSize)
addAttribute(NSFontAttributeName, value: newFont, range: range)
}
}
}
}
用于：
let desc = NSMutableAttributedString(attributedString: *someNSAttributedString*)
desc.convertFontTo(UIFont.systemFontOfSize(16))
适用于iOS 7+
提高对维克多的解决方案，包括颜色：
extension UILabel {
func setHTMLFromString(text: String) {
let modifiedFont = NSString(format:"<span style=\"color:\(self.textColor.toHexString());font-family: \(self.font!.fontName); font-size: \(self.font!.pointSize)\">%@</span>", text) as String
let attrStr = try! NSAttributedString(
data: modifiedFont.dataUsingEncoding(NSUnicodeStringEncoding, allowLossyConversion: true)!,
options: [NSDocumentTypeDocumentAttribute: NSHTMLTextDocumentType, NSCharacterEncodingDocumentAttribute: NSUTF8StringEncoding],
documentAttributes: nil)
self.attributedText = attrStr
}
}
对于这个工作，你还需要的UIColor的YLColor.swift为十六进制的转换https://gist.github.com/yannickl/16f0ed38f0698d9a8ae7