如何在 uiLabel 中同时包含粗体和非粗体文本？
我宁愿不使用 UIWebView .. 我也读过这可能使用 NSAttributedString 但我不知道如何使用它。有任何想法吗？
苹果在他们的几个应用程序中实现了这一点；示例截图：
谢谢！- 多姆
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在 Swift 中，我们不必处理 iOS5 旧的东西，除了语法更短，所以一切都变得非常简单：
斯威夫特 5
func attributedString(from string: String, nonBoldRange: NSRange?) -> NSAttributedString {
let fontSize = UIFont.systemFontSize
let attrs = [
NSAttributedString.Key.font: UIFont.boldSystemFont(ofSize: fontSize),
NSAttributedString.Key.foregroundColor: UIColor.black
]
let nonBoldAttribute = [
NSAttributedString.Key.font: UIFont.systemFont(ofSize: fontSize),
]
let attrStr = NSMutableAttributedString(string: string, attributes: attrs)
if let range = nonBoldRange {
attrStr.setAttributes(nonBoldAttribute, range: range)
}
return attrStr
}
斯威夫特 3
func attributedString(from string: String, nonBoldRange: NSRange?) -> NSAttributedString {
let fontSize = UIFont.systemFontSize
let attrs = [
NSFontAttributeName: UIFont.boldSystemFont(ofSize: fontSize),
NSForegroundColorAttributeName: UIColor.black
]
let nonBoldAttribute = [
NSFontAttributeName: UIFont.systemFont(ofSize: fontSize),
]
let attrStr = NSMutableAttributedString(string: string, attributes: attrs)
if let range = nonBoldRange {
attrStr.setAttributes(nonBoldAttribute, range: range)
}
return attrStr
}
用法：
let targetString = "Updated 2012/10/14 21:59 PM"
let range = NSMakeRange(7, 12)
let label = UILabel(frame: CGRect(x:0, y:0, width:350, height:44))
label.backgroundColor = UIColor.white
label.attributedText = attributedString(from: targetString, nonBoldRange: range)
label.sizeToFit()
奖励：国际化
有人评论国际化。我个人认为这超出了这个问题的范围，但出于教学目的，我会这样做
// Date we want to show
let date = Date()
// Create the string.
// I don't set the locale because the default locale of the formatter is `NSLocale.current` so it's good for internationalisation :p
let formatter = DateFormatter()
formatter.dateStyle = .medium
formatter.timeStyle = .short
let targetString = String(format: NSLocalizedString("Update %@", comment: "Updated string format"),
formatter.string(from: date))
// Find the range of the non-bold part
formatter.timeStyle = .none
let nonBoldRange = targetString.range(of: formatter.string(from: date))
// Convert Range<Int> into NSRange
let nonBoldNSRange: NSRange? = nonBoldRange == nil ?
nil :
NSMakeRange(targetString.distance(from: targetString.startIndex, to: nonBoldRange!.lowerBound),
targetString.distance(from: nonBoldRange!.lowerBound, to: nonBoldRange!.upperBound))
// Now just build the attributed string as before :)
label.attributedText = attributedString(from: targetString,
nonBoldRange: nonBoldNSRange)
结果（假设英语和日语 Localizable.strings 可用）
iOS6 及更高版本的先前答案（Objective-C 仍然有效）：
在 iOS6UILabel中，UIButton, UITextView, UITextField, 支持属性字符串，这意味着我们不需要创建CATextLayers 作为属性字符串的接收者。此外，为了制作属性字符串，我们不再需要使用 CoreText 了 :) 我们在 obj-c Foundation.framework 中有新的类NSParagraphStyle和其他常量，这将使我们的生活更轻松。耶！
所以，如果我们有这个字符串：
NSString *text = @"Updated: 2012/10/14 21:59"
我们只需要创建属性字符串：
if ([_label respondsToSelector:@selector(setAttributedText:)])
{
// iOS6 and above : Use NSAttributedStrings
// Create the attributes
const CGFloat fontSize = 13;
NSDictionary *attrs = @{
NSFontAttributeName:[UIFont boldSystemFontOfSize:fontSize],
NSForegroundColorAttributeName:[UIColor whiteColor]
};
NSDictionary *subAttrs = @{
NSFontAttributeName:[UIFont systemFontOfSize:fontSize]
};
// Range of " 2012/10/14 " is (8,12). Ideally it shouldn't be hardcoded
// This example is about attributed strings in one label
// not about internationalisation, so we keep it simple :)
// For internationalisation example see above code in swift
const NSRange range = NSMakeRange(8,12);
// Create the attributed string (text + attributes)
NSMutableAttributedString *attributedText =
[[NSMutableAttributedString alloc] initWithString:text
attributes:attrs];
[attributedText setAttributes:subAttrs range:range];
// Set it in our UILabel and we are done!
[_label setAttributedText:attributedText];
} else {
// iOS5 and below
// Here we have some options too. The first one is to do something
// less fancy and show it just as plain text without attributes.
// The second is to use CoreText and get similar results with a bit
// more of code. Interested people please look down the old answer.
// Now I am just being lazy so :p
[_label setText:text];
}
这里有一些很好的介绍性博客文章，来自invasivecode的人，其中解释了更多示例用法NSAttributedString，查找“iOS 6 的 NSAttributedString 简介”和“使用 Interface Builder 的 iOS 的属性字符串” :)
PS：上面的代码应该可以工作，但它是大脑编译的。我希望这就足够了:)
iOS5 及以下的旧答案
使用带有NSAttributedString的 CATextLayer ！比 2 个 UILabel 更轻更简单。(iOS 3.2 及以上)
例子。
不要忘记添加 QuartzCore 框架（CALayers 需要）和 CoreText（属性字符串需要。）
#import <QuartzCore/QuartzCore.h>
#import <CoreText/CoreText.h>
下面的示例将向导航控制器的工具栏添加一个子层。à la Mail.app 在 iPhone 中。:)
- (void)setRefreshDate:(NSDate *)aDate
{
[aDate retain];
[refreshDate release];
refreshDate = aDate;
if (refreshDate) {
/* Create the text for the text layer*/
NSDateFormatter *df = [[NSDateFormatter alloc] init];
[df setDateFormat:@"MM/dd/yyyy hh:mm"];
NSString *dateString = [df stringFromDate:refreshDate];
NSString *prefix = NSLocalizedString(@"Updated", nil);
NSString *text = [NSString stringWithFormat:@"%@: %@",prefix, dateString];
[df release];
/* Create the text layer on demand */
if (!_textLayer) {
_textLayer = [[CATextLayer alloc] init];
//_textLayer.font = [UIFont boldSystemFontOfSize:13].fontName; // not needed since `string` property will be an NSAttributedString
_textLayer.backgroundColor = [UIColor clearColor].CGColor;
_textLayer.wrapped = NO;
CALayer *layer = self.navigationController.toolbar.layer; //self is a view controller contained by a navigation controller
_textLayer.frame = CGRectMake((layer.bounds.size.width-180)/2 + 10, (layer.bounds.size.height-30)/2 + 10, 180, 30);
_textLayer.contentsScale = [[UIScreen mainScreen] scale]; // looks nice in retina displays too :)
_textLayer.alignmentMode = kCAAlignmentCenter;
[layer addSublayer:_textLayer];
}
/* Create the attributes (for the attributed string) */
CGFloat fontSize = 13;
UIFont *boldFont = [UIFont boldSystemFontOfSize:fontSize];
CTFontRef ctBoldFont = CTFontCreateWithName((CFStringRef)boldFont.fontName, boldFont.pointSize, NULL);
UIFont *font = [UIFont systemFontOfSize:13];
CTFontRef ctFont = CTFontCreateWithName((CFStringRef)font.fontName, font.pointSize, NULL);
CGColorRef cgColor = [UIColor whiteColor].CGColor;
NSDictionary *attributes = [NSDictionary dictionaryWithObjectsAndKeys:
(id)ctBoldFont, (id)kCTFontAttributeName,
cgColor, (id)kCTForegroundColorAttributeName, nil];
CFRelease(ctBoldFont);
NSDictionary *subAttributes = [NSDictionary dictionaryWithObjectsAndKeys:(id)ctFont, (id)kCTFontAttributeName, nil];
CFRelease(ctFont);
/* Create the attributed string (text + attributes) */
NSMutableAttributedString *attrStr = [[NSMutableAttributedString alloc] initWithString:text attributes:attributes];
[attrStr addAttributes:subAttributes range:NSMakeRange(prefix.length, 12)]; //12 is the length of " MM/dd/yyyy/ "
/* Set the attributes string in the text layer :) */
_textLayer.string = attrStr;
[attrStr release];
_textLayer.opacity = 1.0;
} else {
_textLayer.opacity = 0.0;
_textLayer.string = nil;
}
}
在这个例子中，我只有两种不同类型的字体（粗体和普通），但你也可以有不同的字体大小、不同的颜色、斜体、下划线等。看看NSAttributedString / NSMutableAttributedString和CoreText 属性字符串键。
于 2010-08-27T18:05:47.627 回答
85
在 UILabel 上尝试一个类别：
以下是它的使用方法：
myLabel.text = @"Updated: 2012/10/14 21:59 PM";
[myLabel boldSubstring: @"Updated:"];
[myLabel boldSubstring: @"21:59 PM"];
这是类别
UILabel+Boldify.h
- (void) boldSubstring: (NSString*) substring;
- (void) boldRange: (NSRange) range;
UILabel+Boldify.m
- (void) boldRange: (NSRange) range {
if (![self respondsToSelector:@selector(setAttributedText:)]) {
return;
}
NSMutableAttributedString *attributedText = [[NSMutableAttributedString alloc] initWithAttributedString:self.attributedText];
[attributedText setAttributes:@{NSFontAttributeName:[UIFont boldSystemFontOfSize:self.font.pointSize]} range:range];
self.attributedText = attributedText;
}
- (void) boldSubstring: (NSString*) substring {
NSRange range = [self.text rangeOfString:substring];
[self boldRange:range];
}
请注意，这仅适用于 iOS 6 及更高版本。它在 iOS 5 及更早版本中将被忽略。
于 2013-04-26T18:04:44.133 回答
51
这在Interface Builder中很容易做到：
1）使UILabel Attributed in Attributes Inspector
2）选择要加粗的部分短语
3）在字体选择器中更改其字体（或相同字体的粗体字样）
就这样！
于 2014-09-17T13:35:30.660 回答
46
有基于 bbrame 的类别的类别。它的工作原理类似，但允许您UILabel使用累积结果多次加粗。
UILabel+Boldify.h
@interface UILabel (Boldify)
- (void) boldSubstring: (NSString*) substring;
- (void) boldRange: (NSRange) range;
@end
UILabel+Boldify.m
@implementation UILabel (Boldify)
- (void)boldRange:(NSRange)range {
if (![self respondsToSelector:@selector(setAttributedText:)]) {
return;
}
NSMutableAttributedString *attributedText;
if (!self.attributedText) {
attributedText = [[NSMutableAttributedString alloc] initWithString:self.text];
} else {
attributedText = [[NSMutableAttributedString alloc] initWithAttributedString:self.attributedText];
}
[attributedText setAttributes:@{NSFontAttributeName:[UIFont boldSystemFontOfSize:self.font.pointSize]} range:range];
self.attributedText = attributedText;
}
- (void)boldSubstring:(NSString*)substring {
NSRange range = [self.text rangeOfString:substring];
[self boldRange:range];
}
@end
通过此更正，您可以多次使用它，例如：
myLabel.text = @"Updated: 2012/10/14 21:59 PM";
[myLabel boldSubstring: @"Updated:"];
[myLabel boldSubstring: @"21:59 PM"];
将导致：“更新： 2012/10/14 21:59 PM ”。
于 2013-12-17T10:02:23.687 回答
27
它对我有用：
CGFloat boldTextFontSize = 17.0f;
myLabel.text = [NSString stringWithFormat:@"%@ 2012/10/14 %@",@"Updated:",@"21:59 PM"];
NSRange range1 = [myLabel.text rangeOfString:@"Updated:"];
NSRange range2 = [myLabel.text rangeOfString:@"21:59 PM"];
NSMutableAttributedString *attributedText = [[NSMutableAttributedString alloc] initWithString:myLabel.text];
[attributedText setAttributes:@{NSFontAttributeName:[UIFont boldSystemFontOfSize:boldTextFontSize]}
range:range1];
[attributedText setAttributes:@{NSFontAttributeName:[UIFont boldSystemFontOfSize:boldTextFontSize]}
range:range2];
myLabel.attributedText = attributedText;
对于 Swift 版本：见这里
于 2014-09-24T16:04:04.200 回答
25
我采用了 Crazy Yoghurt 对 swift 扩展的回答。
extension UILabel {
func boldRange(_ range: Range<String.Index>) {
if let text = self.attributedText {
let attr = NSMutableAttributedString(attributedString: text)
let start = text.string.characters.distance(from: text.string.startIndex, to: range.lowerBound)
let length = text.string.characters.distance(from: range.lowerBound, to: range.upperBound)
attr.addAttributes([NSFontAttributeName: UIFont.boldSystemFont(ofSize: self.font.pointSize)], range: NSMakeRange(start, length))
self.attributedText = attr
}
}
func boldSubstring(_ substr: String) {
if let text = self.attributedText {
var range = text.string.range(of: substr)
let attr = NSMutableAttributedString(attributedString: text)
while range != nil {
let start = text.string.characters.distance(from: text.string.startIndex, to: range!.lowerBound)
let length = text.string.characters.distance(from: range!.lowerBound, to: range!.upperBound)
var nsRange = NSMakeRange(start, length)
let font = attr.attribute(NSFontAttributeName, at: start, effectiveRange: &nsRange) as! UIFont
if !font.fontDescriptor.symbolicTraits.contains(.traitBold) {
break
}
range = text.string.range(of: substr, options: NSString.CompareOptions.literal, range: range!.upperBound..<text.string.endIndex, locale: nil)
}
if let r = range {
boldRange(r)
}
}
}
}
可能 Range 和 NSRange 之间没有很好的转换，但我没有找到更好的东西。
于 2015-11-25T07:27:36.783 回答
21
查看TTTAttributedLabel。它是 UILabel 的替代品，通过将 NSAttributedString 设置为该标签的文本，您可以在单个标签中混合字体和颜色。
于 2011-06-02T21:16:08.833 回答
12
在这种情况下，您可以尝试，
UILabel *displayLabel = [[UILabel alloc] initWithFrame:/*label frame*/];
displayLabel.font = [UIFont boldSystemFontOfSize:/*bold font size*/];
NSMutableAttributedString *notifyingStr = [[NSMutableAttributedString alloc] initWithString:@"Updated: 2012/10/14 21:59 PM"];
[notifyingStr beginEditing];
[notifyingStr addAttribute:NSFontAttributeName
value:[UIFont systemFontOfSize:/*normal font size*/]
range:NSMakeRange(8,10)/*range of normal string, e.g. 2012/10/14*/];
[notifyingStr endEditing];
displayLabel.attributedText = notifyingStr; // or [displayLabel setAttributedText: notifyingStr];
于 2013-07-19T10:11:02.927 回答
8
在 UILabel 中使文本变为粗体和下划线。只需在代码中添加以下行。
NSRange range1 = [lblTermsAndCondition.text rangeOfString:NSLocalizedString(@"bold_terms", @"")];
NSRange range2 = [lblTermsAndCondition.text rangeOfString:NSLocalizedString(@"bold_policy", @"")];
NSMutableAttributedString *attributedText = [[NSMutableAttributedString alloc] initWithString:lblTermsAndCondition.text];
[attributedText setAttributes:@{NSFontAttributeName:[UIFont fontWithName:fontBold size:12.0]}
range:range1];
[attributedText setAttributes:@{NSFontAttributeName:[UIFont fontWithName:fontBold size:12.0]}
range:range2];
[attributedText addAttribute:(NSString*)kCTUnderlineStyleAttributeName
value:[NSNumber numberWithInt:kCTUnderlineStyleSingle]
range:range1];
[attributedText addAttribute:(NSString*)kCTUnderlineStyleAttributeName
value:[NSNumber numberWithInt:kCTUnderlineStyleSingle]
range:range2];
lblTermsAndCondition.attributedText = attributedText;
于 2016-08-30T06:04:38.047 回答
6
NSString *needToChangeStr=@"BOOK";
NSString *display_string=[NSString stringWithFormat:@"This is %@",book];
NSMutableAttributedString *attri_str=[[NSMutableAttributedString alloc]initWithString:display_string];
int begin=[display_string length]-[needToChangeStr length];
int end=[needToChangeStr length];
[attri_str addAttribute:NSFontAttributeName value:[UIFont fontWithName:@"HelveticaNeue-Bold" size:30] range:NSMakeRange(begin, end)];
于 2013-04-25T10:01:11.207 回答
5
斯威夫特 4：
// attribute with color red and Bold
var attrs1 = [NSAttributedStringKey.font: UIFont.boldSystemFont(ofSize: 20), NSAttributedStringKey.foregroundColor: UIColor.red]
// attribute with color black and Non Bold
var attrs2 = [NSAttributedStringKey.font: UIFont(name: "Roboto-Regular", size: 20), NSAttributedStringKey.foregroundColor: UIColor.black]
var color1 = NSAttributedString(string: "RED", attributes: attrs1)
var color2 = NSAttributedString(string: " BLACK", attributes: attrs2)
var string = NSMutableAttributedString()
string.append(color1)
string.append(color2)
// print the text with **RED** BLACK
print("Final String : \(string)")
于 2018-03-23T12:44:09.190 回答
3
提供要处理的字符串作为输入，并提供应该加粗/着色的单词作为输入。
func attributedString(parentString:String, arrayOfStringToProcess:[String], color:UIColor) -> NSAttributedString
{
let parentAttributedString = NSMutableAttributedString(string:parentString, attributes:nil)
let parentStringWords = parentAttributedString.string.components(separatedBy: " ")
if parentStringWords.count != 0
{
let wordSearchArray = arrayOfStringToProcess.filter { inputArrayIndex in
parentStringWords.contains(where: { $0 == inputArrayIndex }
)}
for eachWord in wordSearchArray
{
parentString.enumerateSubstrings(in: parentString.startIndex..<parentString.endIndex, options: .byWords)
{
(substring, substringRange, _, _) in
if substring == eachWord
{
parentAttributedString.addAttribute(.font, value: UIFont.boldSystemFont(ofSize: 15), range: NSRange(substringRange, in: parentString))
parentAttributedString.addAttribute(.foregroundColor, value: color, range: NSRange(substringRange, in: parentString))
}
}
}
}
return parentAttributedString
}
于 2018-02-22T11:28:12.797 回答
2
我刚刚在我的项目中（在 Swift 中）实现的以下代码不需要 NSRange：
//Code sets label (yourLabel)'s text to "Tap and hold(BOLD) button to start recording."
let boldAttribute = [
//You can add as many attributes as you want here.
NSFontAttributeName: UIFont(name: "HelveticaNeue-Bold", size: 18.0)!
]
let regularAttribute = [NSFontAttributeName: UIFont(name: "HelveticaNeue-Light", size: 18.0)!]
let beginningAttributedString = NSAttributedString(string: "Tap and ", attributes: regularAttribute )
let boldAttributedString = NSAttributedString(string: "hold ", attributes: boldAttribute)
let endAttributedString = NSAttributedString(string: "button to start recording.", attributes: regularAttribute )
let fullString = NSMutableAttributedString()
fullString.appendAttributedString(beginningAttributedString)
fullString.appendAttributedString(boldAttributedString)
fullString.appendAttributedString(endAttributedString)
yourLabel.attributedText = fullString
于 2016-06-22T15:58:10.640 回答
1
如果您想更轻松地使用属性字符串，请尝试使用 Attributed String Creator，它将为您生成代码。https://itunes.apple.com/us/app/attributed-string-creator/id730928349
于 2014-09-03T07:05:32.043 回答
0
AttributeString 具有标记字符串的构造函数，这样做可能意味着您的属性字符串没有其他属性，因此，如果您使用的是 xibs，则可以将没有粗体的文本设置为您想要的所有其他属性，然后在代码枚举标记字符串的属性范围，并将它们应用于从 xib 文件中获取的属性字符串，然后将其重新应用于特定字段的属性属性字符串。
于 2022-02-09T08:53:22.067 回答