添加轻击手势到UILabel的一部分

Question

我有一个像这样的NSAttributedString：

NSMutableAttributedString *str = [[NSMutableAttributedString alloc] initWithString:@"testing it out @clickhere"];
NSInteger length = str.length;
[str addAttribute:NSForegroundColorAttributeName value:[UIColor bestTextColor] range:NSMakeRange(0,length)];

NSMutableAttributedString设置为UILabel，如下所示：

label.attributedText = str;

如何在另一个视图控制器中为上面的字符串中的'@clickhere'做出一个轻击手势（或可点击的东西）？

谢谢！

Answer 1

我认为，最好的方法是将UIGestureRecognizer添加到你的UILabel并验证你想要的框架。

UITapGestureRecognizer *singleTap = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(handleTap:)];
[_yourLabel addGestureRecognizer:singleTap];

- (void)handleTap:(UITapGestureRecognizer *)tapRecognizer
{
    CGPoint touchPoint = [tapRecognizer locationInView: _yourLabel];

    //Modify the validFrame that you would like to enable the touch
    //or get the frame from _yourLabel using the NSMutableAttributedString, if possible
    CGRect validFrame = CGRectMake(0, 0, 300, 44);

    if(YES == CGRectContainsPoint(validFrame, touchPoint)
     {
        //Handle here.
     }
}

Answer 2

只需先在标签上添加一个手势即可

[label setUserInteractionEnabled:YES];
UITapGestureRecognizer *gesture = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(handleGesture:)];
[label addGestureRecognizer:gesture];

在下面的方法中控制您的手势区域

- (void)handleGesture:(UIGestureRecognizer *)gestureRecognizer
{
    static CGRect touchableRect = CGRectMake(100.0f, 0.0f, 100.0f, 50.0f); // Give your rect as you need.
    CGPoint touchPoint = [gestureRecognizer locationInView:self.view];
    if (CGRectContainsPoint(touchableRect, touchPoint))
    {
       //User has tap on where you want. Do your other stuff here
    }
}

Answer 3

  UITapGestureRecognizer *Tap = [[UITapGestureRecognizer alloc]  initWithTarget:self action:@selector(tapDetected)];
Tap.numberOfTapsRequired = 1;
// label Name Is your Label Name
[labelName addGestureRecognizer:Tap];
-(void)tapDetected
  {
  //your code
   }

Answer 4

我想补充一下Ramshad的答案，关于如何处理有效的框架。

为此，您可能需要考虑使用UITextView而不是UILabel，它不能让您访问它如何管理文本的布局。通过禁用编辑，选择和滚动，UITextView的行为与UILabel大致相同，只是必须删除一些填充。

为方便起见，您可能需要在UITextView中添加一个小类别，在其中编写一个方法来测试一个点是否接触到范围内的任何字符。

- (BOOL)point:(CGPoint)point touchesSomeCharacterInRange:(NSRange)range
{
    NSRange glyphRange = [self.layoutManager glyphRangeForCharacterRange:range actualCharacterRange:NULL];

    BOOL touches = NO;
    for (NSUInteger index = glyphRange.location; index < glyphRange.location + glyphRange.length; index++) {
        CGRect rectForGlyphInContainer = [self.layoutManager boundingRectForGlyphRange:NSMakeRange(index, 1) inTextContainer:self.textContainer];
        CGRect rectForGlyphInTextView = CGRectOffset(rectForGlyphInContainer, self.textContainerInset.left, self.textContainerInset.top);

        if (CGRectContainsPoint(rectForGlyphInTextView, point)) {
            touches = YES;
            break;
        }
    }

    return touches;
}

这也适用于包含多个单词的文本片段，这些单词由于自动换行而分布在多行中。当我们处理打印的字形时，它也适用于本地化文本。

Answer 5

这个想法和接受的答案是一样的。这是斯威夫特的方式。

• 假设您已准备好标签。 youLabel.text = "please tab me!"
• 将tapGestureRecognizer添加到您的标签中 qazxsw poi
• 将

  let tap = UITapGestureRecognizer(target: self, action:    #selector(tapAction))
  yourLabel.addGestureRecognizer(tap)

  扩展方法添加到String以计算字符串rect。 String
• 计算点击手势的可用点击矩形。

  extension String {
      func rect(font: UIFont) -> CGRect {
          let label = UILabel(frame: .zero)
          label.font = font
          label.text = self
          label.sizeToFit()
          return label.frame
      }
  }

• 在行动中做你想要的

  let pleaseStringRect = "please".rect(font: yourFont)
  let tapStringRect = "tap".rect(font: yourFont)
  let tapAreaRect = CGRect(x: pleaseStringRect.width, y:   tapStringRect.origin.y, width: tapStringRect.width, height: tapStringRect.height"

  就是这样，快乐的编码。