iOS：在NSAttributedString上添加按钮 [英] iOS: Add Button over NSAttributedString

问题描述

我想知道是否可以将UIButton放在一段文本的精确坐标上。

I want to know if is possible to put a UIButton over a exactly coordinate of a piece of text.

例如，我的UILabel有这样的文字：

For example, my UILabel have this text:

没有账户？登录

在斜体内容中，我需要按一下按钮，触摸此按钮将触发一个操作，将打开登录视图

In the italic content, I need to put a button over then, the touch over this button will trigger an action that will open a Sign In View

非常重要使这个功能很好，在其他语言中使用它不做任何事情：）

Is very important to make this feature well, to work with same in other languages without do anything :)

谢谢

推荐答案

我会回答我的回答，因为这对于遇到同样问题的其他开发者会有所帮助。

I'll respond my answer because this can be helpful for other developers that got the same problem.

1 ：你需要实现UITextViewDelegate方法：
- （BOOL）textView：shouldInteractWithURL：inRange：

1: You need to implement UITextViewDelegate method: - (BOOL)textView:shouldInteractWithURL:inRange:

实现非常简单，基本上，您将比较NSURL中收到的链接。当我有很多链接时，我喜欢使用NSURL组件通过主机进行比较，例如：

The implementation is very simple, basically, you will compare the received link in NSURL. I like to compare by host using the NSURL components when I have many links, for example:

- (BOOL)textView:(UITextView *)textView shouldInteractWithURL:(NSURL *)URL inRange:(NSRange)characterRange
{
  NSString *urlScheme     = URL.scheme;
  NSString *host          = URL.host;

  if([urlScheme isEqualToString:@"myapp"])
  {
    if([host isEqualToString:@"/signin"])
      [self.onSignRequest( self )];
  }

  return YES;
}

当用户触摸链接时，将调用此方法。

This method will be called when user touch over link.

2 ：创建两个 NSString 个实例，一个用于字符串Don有一个帐户？和另一个用于字符串注册

2: Create two NSString instances, one for the string "Don't have an account?" and another one for string "Sign Up"

NSString *labelText = @"Don't have an account? ";
NSString *linkedText = @"Sign Up";

3 ：创建 NSMutableAttributedString 两个字符串连接的实例：

3: Create a NSMutableAttributedString instance with both strings concated:

NSMutableAttributedString *attributedString = [[NSMutableAttributedString alloc] initWithAttributedString:[AttributedText attributedStringWithText:[NSString stringWithFormat:@"%@%@", labelText, linkedText]
                                                                                                                                          font:[UIFOnt systemFontOfSize:14.f]
                                                                                                                                         color:[UIColor blueColor]]];

4 ：为可变属性字符串中的链接文本创建范围之前创建：

4: Create a range for a linked text from the mutable attributed string created before:

NSRange range = [[attributedString  string] rangeOfString:linkedText];

5 ：创建一个字符串

5 ：为可变字符串添加新的 NSLinkAttributeName ，其中包含在步骤 4

5: Add a new NSLinkAttributeName for the mutable string with the range created in step 4

[attributedString addAttribute:NSLinkAttributeName value:URLStringLink range:range];

6 ：使用 attributionText 的属性> UILabel

_label.attributedText = attributedText;

7 ：设置标签的代表：

_label.delegate = textViewDelegate;

就是这样。我希望这对任何人都需要在 UILabel

And that's it. I hope this can be helpful for anyone needs to add "touchable" links in UILabel

干杯中添加可触摸链接是有帮助的，

Cheers,

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