富文本添加点击事件版本限制问题解决2019-08-27

项目登录页面需要添加产品协议和隐私政策，想到的方案就是使用富文本添加超链接点击事件

• (void)configContentWithArray:(NSArray *)array{
  NSMutableString *str = [NSMutableString string];
  for (NSInteger i = 0; i < array.count; i++) {
  NSDictionary *dic = array[i];
  [str appendString:dic[@"str"]];
  }
  NSMutableAttributedString *attributedString = [[NSMutableAttributedString alloc] initWithString:str];
  for (NSInteger i = 0; i < array.count; i++) {
  NSDictionary *dic = array[i];
  [attributedString addAttributes:@{NSFontAttributeName : dic[@"font"],NSForegroundColorAttributeName : dic[@"color"]} range:[[attributedString string] rangeOfString:dic[@"str"]]];
  if ([dic[@"click"] boolValue]) {
  [attributedString addAttribute:NSLinkAttributeName
  value:[NSString stringWithFormat:@"click%@://",@(i)]
  range:[[attributedString string] rangeOfString:dic[@"str"]]];
  [attributedString addAttribute:NSForegroundColorAttributeName
  value:dic[@"color"]
  range:[[attributedString string] rangeOfString:dic[@"str"]]];
  }

}
NSMutableParagraphStyle *ornamentParagraph = [[NSParagraphStyle defaultParagraphStyle] mutableCopy];
//设置text文字居中
ornamentParagraph.alignment = NSTextAlignmentCenter;

[attributedString addAttribute:NSParagraphStyleAttributeName value:ornamentParagraph range:[[attributedString string] rangeOfString:attributedString.string]];

self.content = attributedString;
self.textView.attributedText = self.content;

}
但是在测试的过程中出现了低版本点击无效果的现象；发现该方法- (BOOL)textView:(UITextView *)textView shouldInteractWithURL:(NSURL *)URL inRange:(NSRange)characterRange interaction:(UITextItemInteraction)interaction API_AVAILABLE(ios(10.0))在iOS10以后才有用，所以需要想办法实现iOS10以下版本的点击效果

• (BOOL)textView:(UITextView *)textView shouldInteractWithURL:(NSURL *)URL inRange:(NSRange)characterRange interaction:(UITextItemInteraction)interaction API_AVAILABLE(ios(10.0)){

  if ([[URL scheme] containsString:@"click"]) {
  NSAttributedString *abStr = [textView.attributedText attributedSubstringFromRange:characterRange];
  if (self.eventBlock) {
  self.eventBlock(abStr.string);
  }

    return NO;
  

  }
  return YES;
  }
  替代方法是- (BOOL)textView:(UITextView)textView shouldInteractWithURL:(NSURL)URL inRange:(NSRange)characterRange，但是该方法的操作和iOS10的方法有区别，这个需要长按才会有反应；操作体验有差别，效果不好，所以添加手势辅助操作实现点按功能
  UITapGestureRecognizer *tapRecognizer = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(addGestureRecognizer:)];
  [self.textView addGestureRecognizer:tapRecognizer]
  //该方法支持（7_0, 10_0），长按才有反应，点击无效果，所以添加手势辅助操作实现点按功能

• (BOOL)textView:(UITextView)textView shouldInteractWithURL:(NSURL)URL inRange:(NSRange)characterRange{

  if (([URL isKindOfClass:[NSString class]] && [(NSString *)URL containsString:@"click"]) || [[URL scheme] containsString:@"click"]) {
  NSAttributedString *abStr = [textView.attributedText attributedSubstringFromRange:characterRange];
  if (self.eventBlock) {
  self.eventBlock(abStr.string);
  }

    return NO;
  

  }
  return YES;
  }

• (void)addGestureRecognizer:(UIGestureRecognizer*)gestureRecognizer{
  if ([gestureRecognizer isKindOfClass:[UITapGestureRecognizer class]])
  {
  CGPoint tapLocation = [gestureRecognizer locationInView:self.textView];
  UITextPosition *textPosition = [self.textView closestPositionToPoint:tapLocation];
  NSDictionary *attributes = [self.textView textStylingAtPosition:textPosition inDirection:UITextStorageDirectionBackward];
  NSURL *url = attributes[NSLinkAttributeName];
  if(url) {
  NSRange range = [self.textView.text rangeOfString:@"《产品协议》"];
  if (([url isKindOfClass:[NSString class]] && [(NSString *)url containsString:@"click1"]) || (([url isKindOfClass:[NSURL class]] && [[url scheme] containsString:@"click1"]))) {
  range = [self.textView.text rangeOfString:@"《产品协议》"];
  } else if(([url isKindOfClass:[NSString class]] && [(NSString *)url containsString:@"click3"]) || (([url isKindOfClass:[NSURL class]] && [[url scheme] containsString:@"click3"]))){
  range = [self.textView.text rangeOfString:@"《隐私保护指引》"];
  }

        if([self conformsToProtocol:@protocol(UITextViewDelegate)] && [self respondsToSelector:@selector(textView:shouldInteractWithURL:inRange:)])
        {
  
            [self textView:self.textView shouldInteractWithURL:url inRange:range];
        }
    }
  

  }
  [super addGestureRecognizer:gestureRecognizer];

}
以上代码就可以完美的兼容不同版本的点击效果，做个记录