在UILabel.attributedText中建立链接*不是*蓝色，*不是*带下划线

问题描述 投票：36回答：11

我希望我的OHAttributedLabel中的一些单词是链接，但我希望它们是蓝色以外的颜色，我不想要下划线。

这给了我一个带下划线文字的蓝色链接：

 -(void)createLinkFromWord:(NSString*)word withColor:(UIColor*)color atRange:(NSRange)range{

    NSMutableAttributedString* mutableAttributedText = [self.label.attributedText mutableCopy];   

    [mutableAttributedText beginEditing];
    [mutableAttributedText addAttribute:kOHLinkAttributeName
                   value:[NSURL URLWithString:@"http://www.somewhere.net"]
                   range:range];

    [mutableAttributedText addAttribute:(id)kCTForegroundColorAttributeName
                   value:color
                   range:range];

    [mutableAttributedText addAttribute:(id)kCTUnderlineStyleAttributeName
                   value:[NSNumber numberWithInt:kCTUnderlineStyleNone]
                   range:range];
    [mutableAttributedText endEditing];


    self.label.attributedText = mutableAttributedText;

}

由于我正在使用OHAttributedLabel，我也尝试使用它的NSAttributedString+Attributes.h类别中的方法，但那些返回蓝色下划线链接：

-(void)createLinkFromWord:(NSString*)word withColor:(UIColor*)color atRange:(NSRange)range{

NSMutableAttributedString* mutableAttributedText = [self.label.attributedText mutableCopy];

[mutableAttributedText setLink:[NSURL URLWithString:@"http://www.somewhere.net"] range:range];
[mutableAttributedText setTextColor:color range:range];
[mutableAttributedText setTextUnderlineStyle:kCTUnderlineStyleNone range:range];

self.label.attributedText = mutableAttributedText;
}

如果我注释掉在每个版本中设置链接的行，那么文本就会变成我传入的内容 - 这是有效的。似乎设置链接覆盖了这个并将其转回蓝色。

不幸的是，我发现的苹果文档页面显示了如何将链接文本设置为蓝色并加下划线，正是我不需要的：https://developer.apple.com/library/content/documentation/Cocoa/Conceptual/AttributedStrings/Tasks/ChangingAttrStrings.html

ios objective-c xcode nsattributedstring
11个回答
61
投票

所以我最终使用了TTTAttributedLabel：

-(void)createLinkFromWord:(NSString*)word withColor:(UIColor*)color atRange:(NSRange)range{
    NSMutableAttributedString* newTextWithLinks = [self.label.attributedText mutableCopy];
    NSURL *url = [NSURL URLWithString:@"http://www.reddit.com"];
    self.label.linkAttributes = @{NSForegroundColorAttributeName: color, 
                                   NSUnderlineStyleAttributeName: @(NSUnderlineStyleNone)};
    [self.label addLinkToURL:url withRange:range];
}

我发现OHAttributedLabel实际上确实有方法来设置链接和声明颜色并为这些链接加下划线样式。但是，我希望链接基于参数是不同的颜色。 TTTAttributedLabel允许你为你创建的每个链接设置它的linkAttributes属性。

0
投票

Swift 4.0：

简短而简单

 let LinkAttributes = NSMutableDictionary(dictionary: testLink.linkAttributes)
 LinkAttributes[NSAttributedStringKey.underlineStyle] =  NSNumber(value: false)
 LinkAttributes[NSAttributedStringKey.foregroundColor] = UIColor.black // Whatever your label color
 testLink.linkAttributes = LinkAttributes as NSDictionary as! [AnyHashable: Any]
-1
投票

最好在启用“链接”功能的情况下使用UITextView。在这种情况下，您可以使用一行：

斯威夫特4：

// apply link attributes to label.attributedString, then
textView.tintColor = UIColor.red // any color you want

完整示例：

    let attributedString = NSMutableAttributedString(string: "Here is my link")
    let range = NSRange(location: 7, length:4)
    attributedString.addAttribute(.link, value: "http://google.com", range: range)
    attributedString.addAttribute(.underlineStyle, value: 1, range: range)
    attributedString.addAttribute(.underlineColor, value: UIColor.red, range: range)
    textView.tintColor = UIColor.red // any color you want

或者，您只能将属性应用于链接：

  textView.linkTextAttributes = [
      .foregroundColor: UIColor.red
      .underlineStyle: 1,
      .underlineColor: UIColor.red
   ]
23
投票

我正在使用TTTAttributedLabel。我想改变链接文本的颜色，并保持下划线。 Pim的答案看起来很棒，但对我来说不起作用。这是做了什么工作：

label.linkAttributes = @{ (id)kCTForegroundColorAttributeName: [UIColor magentaColor],
                           (id)kCTUnderlineStyleAttributeName : [NSNumber numberWithInt:NSUnderlineStyleSingle] };

注意：如果您不希望文本带下划线，则从字典中删除kCTUnderlineStyleAttributeName键。

22
投票

这是我改进版的Ramsel已经很好的答案。我相信它更具可读性，我希望它会得到很好的利用。

label.linkAttributes = @{ NSForegroundColorAttributeName: [UIColor whiteColor],
                          NSUnderlineStyleAttributeName: [NSNumber numberWithInt:NSUnderlineStyleSingle] };

这是a list of other attibute names。

8
投票

如果您使用的是UITextView，则可能需要更改tintColor属性以更改链接颜色。

6
投票

适用于TTTAttributedLabel的Swift 2.3示例：

yourLabel.linkAttributes       = [
    NSForegroundColorAttributeName: UIColor.grayColor(),
    NSUnderlineStyleAttributeName: NSNumber(bool: true)
]
yourLabel.activeLinkAttributes = [
    NSForegroundColorAttributeName: UIColor.grayColor().colorWithAlphaComponent(0.8),
    NSUnderlineStyleAttributeName: NSNumber(bool: false)
]

斯威夫特4

yourLabel.linkAttributes = [
    .foregroundColor: UIColor.grayColor(),
    .underlineStyle: NSNumber(value: true)
]
yourLabel.activeLinkAttributes = [
    .foregroundColor: UIColor.grayColor().withAlphaComponent(0.7),
    .underlineStyle: NSNumber(value: false)
]
2
投票

如果你像我一样，并且真的不想使用TTT（或者在你自己的自定义实现中需要它以其他奇怪的方式绘制）：

首先，子类NSLayoutManager然后覆盖如下：

- (void)showCGGlyphs:(const CGGlyph *)glyphs 
           positions:(const CGPoint *)positions 
               count:(NSUInteger)glyphCount
                font:(UIFont *)font 
              matrix:(CGAffineTransform)textMatrix 
          attributes:(NSDictionary *)attributes
           inContext:(CGContextRef)graphicsContext
{
   UIColor *foregroundColor = attributes[NSForegroundColorAttributeName];

   if (foregroundColor)
   {
      CGContextSetFillColorWithColor(graphicsContext, foregroundColor.CGColor);
   }

   [super showCGGlyphs:glyphs 
             positions:positions 
                 count:glyphCount 
                  font:font 
                matrix:textMatrix 
            attributes:attributes 
             inContext:graphicsContext];
}

这或多或少告诉布局管理员实际上从你的属性字符串中实际尊重NSForegroundColorAttributeName而不是Apple内部链接的怪异。

如果您需要做的就是获得一个正确绘制的布局管理器（根据需要），您可以在这里停下来。如果你需要一个真正的UILabel，它很痛苦但可能。

首先，再次，UILabel的子类和所有这些方法中的slap。

- (NSTextStorage *)textStorage
{
   if (!_textStorage)
   {
      _textStorage = [[NSTextStorage alloc] init];
      [_textStorage addLayoutManager:self.layoutManager];
      [self.layoutManager setTextStorage:_textStorage];
   }

   return _textStorage;
}

- (NSTextContainer *)textContainer
{
   if (!_textContainer)
   {
      _textContainer = [[NSTextContainer alloc] init];
      _textContainer.lineFragmentPadding = 0;
      _textContainer.maximumNumberOfLines = self.numberOfLines;
      _textContainer.lineBreakMode = self.lineBreakMode;
      _textContainer.widthTracksTextView = YES;
      _textContainer.size = self.frame.size;

      [_textContainer setLayoutManager:self.layoutManager];
   }

   return _textContainer;
}

- (NSLayoutManager *)layoutManager
{
   if (!_layoutManager)
   {
      // Create a layout manager for rendering
      _layoutManager = [[PRYLayoutManager alloc] init];
      _layoutManager.delegate = self;
      [_layoutManager addTextContainer:self.textContainer];
   }

   return _layoutManager;
}

- (void)layoutSubviews
{
   [super layoutSubviews];

   // Update our container size when the view frame changes
   self.textContainer.size = self.bounds.size;
}

- (void)setFrame:(CGRect)frame
{
   [super setFrame:frame];

   CGSize size = frame.size;
   size.width = MIN(size.width, self.preferredMaxLayoutWidth);
   size.height = 0;
   self.textContainer.size = size;
}

- (void)setBounds:(CGRect)bounds
{
   [super setBounds:bounds];

   CGSize size = bounds.size;
   size.width = MIN(size.width, self.preferredMaxLayoutWidth);
   size.height = 0;
   self.textContainer.size = size;
}

- (void)setPreferredMaxLayoutWidth:(CGFloat)preferredMaxLayoutWidth
{
   [super setPreferredMaxLayoutWidth:preferredMaxLayoutWidth];

   CGSize size = self.bounds.size;
   size.width = MIN(size.width, self.preferredMaxLayoutWidth);
   self.textContainer.size = size;
}
- (CGRect)textRectForBounds:(CGRect)bounds limitedToNumberOfLines:(NSInteger)numberOfLines
{
  // Use our text container to calculate the bounds required. First save our
  // current text container setup
  CGSize savedTextContainerSize = self.textContainer.size;
  NSInteger savedTextContainerNumberOfLines = self.textContainer.maximumNumberOfLines;

  // Apply the new potential bounds and number of lines
  self.textContainer.size = bounds.size;
  self.textContainer.maximumNumberOfLines = numberOfLines;

  // Measure the text with the new state
  CGRect textBounds;
  @try
  {
      NSRange glyphRange = [self.layoutManager 
                            glyphRangeForTextContainer:self.textContainer];
      textBounds = [self.layoutManager boundingRectForGlyphRange:glyphRange
                                       inTextContainer:self.textContainer];

      // Position the bounds and round up the size for good measure
      textBounds.origin = bounds.origin;
      textBounds.size.width = ceilf(textBounds.size.width);
      textBounds.size.height = ceilf(textBounds.size.height);
  }
  @finally
  {
      // Restore the old container state before we exit under any circumstances
      self.textContainer.size = savedTextContainerSize;
      self.textContainer.maximumNumberOfLines = savedTextContainerNumberOfLines;
   }

   return textBounds;
}

- (void)setAttributedText:(NSAttributedString *)attributedText
{
    // Pass the text to the super class first
    [super setAttributedText:attributedText];

    [self.textStorage setAttributedString:attributedText];
}
- (CGPoint)_textOffsetForGlyphRange:(NSRange)glyphRange
{
   CGPoint textOffset = CGPointZero;

   CGRect textBounds = [self.layoutManager boundingRectForGlyphRange:glyphRange 
                                                     inTextContainer:self.textContainer];
   CGFloat paddingHeight = (self.bounds.size.height - textBounds.size.height) / 2.0f;
   if (paddingHeight > 0)
   {
       textOffset.y = paddingHeight;
   }

   return textOffset;
}

- (void)drawTextInRect:(CGRect)rect
{
   // Calculate the offset of the text in the view
   CGPoint textOffset;
   NSRange glyphRange = [self.layoutManager glyphRangeForTextContainer:self.textContainer];
   textOffset = [self _textOffsetForGlyphRange:glyphRange];

   // Drawing code
   [self.layoutManager drawBackgroundForGlyphRange:glyphRange atPoint:textOffset];

   // for debugging the following 2 line should produce the same results
   [self.layoutManager drawGlyphsForGlyphRange:glyphRange atPoint:textOffset];
   //[super drawTextInRect:rect];
}

Shamelessly taken from here。令人难以置信地为原作者的工作而努力。

1
投票

对于Swift 3，以下方式使用TTTAttributedLabel为我解决：

1）在故事板上添加标签，并将其类别定义为TTTAttributedLabel Storyboard view

2）在代码中定义@IBOutlet var termsLabel: TTTAttributedLabel!

3）然后在ViewDidLoad写下这些行

termsLabel.attributedText = NSAttributedString(string: "By using this app you agree to the Privacy Policy & Terms & Conditions.")
guard let labelString = termsLabel.attributedText else {
            return
        }
        guard let privacyRange = labelString.string.range(of: "Privacy Policy") else {
            return
        }
        guard let termsConditionRange = labelString.string.range(of: "Terms & Conditions") else {
            return
        }

        let privacyNSRange: NSRange = labelString.string.nsRange(from: privacyRange)
        let termsNSRange: NSRange = labelString.string.nsRange(from: termsConditionRange)

        termsLabel.addLink(to: URL(string: "privacy"), with: privacyNSRange)
        termsLabel.addLink(to: URL(string: "terms"), with: termsNSRange)

        termsLabel.delegate = self
        let attributedText = NSMutableAttributedString(attributedString: termsLabel.attributedText!)
        attributedText.addAttributes([NSFontAttributeName : UIFont(name: "Roboto-Medium", size: 12)!], range: termsNSRange)
        attributedText.addAttributes([NSFontAttributeName : UIFont(name: "Roboto-Medium", size: 12)!], range: privacyNSRange)
        attributedText.addAttributes([kCTForegroundColorAttributeName as String: UIColor.orange], range: termsNSRange)
        attributedText.addAttributes([kCTForegroundColorAttributeName as String: UIColor.green], range: privacyNSRange)
        attributedText.addAttributes([NSUnderlineStyleAttributeName: NSUnderlineStyle.styleNone.rawValue], range: termsNSRange)
        attributedText.addAttributes([NSUnderlineStyleAttributeName: NSUnderlineStyle.styleNone.rawValue], range: privacyNSRange)
        termsLabel.attributedText = attributedText

它看起来像这个Simulator View

4）最后编写TTTAttributedLabel的委托功能，以便您可以打开链接

public func attributedLabel(_ label: TTTAttributedLabel!, didSelectLinkWith url: URL!) {
    switch url.absoluteString  {
    case "privacy":
        SafariBrowser.open("http://google.com", presentingViewController: self)
    case "terms":
        SafariBrowser.open("http://google.com", presentingViewController: self)
    default:
        break
    }
}

更新Swift 4.2

对于Swift 4.2，步骤3中有一些更改，所有其他步骤将保持与上面相同：

3）在ViewDidLoad写这些线

termsLabel.attributedText = NSAttributedString(string: "By using this app you agree to the Privacy Policy & Terms & Conditions.")
guard let labelString = termsLabel.attributedText else {
            return
        }
        guard let privacyRange = labelString.string.range(of: "Privacy Policy") else {
            return
        }
        guard let termsConditionRange = labelString.string.range(of: "Terms & Conditions") else {
            return
        }

        let privacyNSRange: NSRange = labelString.string.nsRange(from: privacyRange)
        let termsNSRange: NSRange = labelString.string.nsRange(from: termsConditionRange)

        termsLabel.addLink(to: URL(string: "privacy"), with: privacyNSRange)
        termsLabel.addLink(to: URL(string: "terms"), with: termsNSRange)

        termsLabel.delegate = self
        let attributedText = NSMutableAttributedString(attributedString: termsLabel.attributedText!)
        attributedText.addAttributes([NSAttributedString.Key.font : UIFont(name: "Roboto-Regular", size: 12)!], range: termsNSRange)
        attributedText.addAttributes([NSAttributedString.Key.font : UIFont(name: "Roboto-Regular", size: 12)!], range: privacyNSRange)
        attributedText.addAttributes([kCTForegroundColorAttributeName as NSAttributedString.Key : UIColor.orange], range: termsNSRange)
        attributedText.addAttributes([kCTForegroundColorAttributeName as NSAttributedString.Key : UIColor.green], range: privacyNSRange)
    attributedText.addAttributes([NSAttributedString.Key.underlineStyle: 0], range: termsNSRange)
        attributedText.addAttributes([NSAttributedString.Key.underlineStyle: 0], range: privacyNSRange)
0
投票

Swift 3 TTTAttributedLabel的例子：

yourLabel.linkAttributes = [
    NSForegroundColorAttributeName: UIColor.green,  
    NSUnderlineStyleAttributeName: NSNumber(value: NSUnderlineStyle.styleNone.rawValue)
]
yourLabel.activeLinkAttributes = [
    NSForegroundColorAttributeName: UIColor.green,  
    NSUnderlineStyleAttributeName: NSNumber(value: NSUnderlineStyle.styleDouble.rawValue)
]
0
投票

对于使用TTTAttributedLabel的Swift 3

let title: NSString = "Fork me on GitHub!"

var attirutedDictionary = NSMutableDictionary(dictionary:attributedLabel.linkAttributes)

attirutedDictionary[NSForegroundColorAttributeName] = UIColor.red
attirutedDictionary[NSUnderlineStyleAttributeName] =  NSNumber(value: NSUnderlineStyle.styleNone.rawValue)

attributedLabel.attributedText = NSAttributedString(string: title as String)
attributedLabel.linkAttributes = attirutedDictionary as! [AnyHashable: Any]

let range = subtitleTitle.range(of: "me")
let url = URL(string: "http://github.com/mattt/")

attributedLabel.addLink(to: url, with: range)
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