ios 改变HTML超链接颜色和点击事件

利用UITextView加载接口返回的HTML标签、改变超链接文字的颜色和点击事件。

• (UITextView *)textView {
  if (!_textView) {
  _textView = [[UITextView alloc] init];
  _textView.backgroundColor = [UIColor clearColor];
  _textView.editable = NO;
  _textView.scrollEnabled = NO;
  _textView.delegate = self;
  _textView.font = [UIFont systemFontOfSize:15];
  _textView.textContainerInset = UIEdgeInsetsZero;
  _textView.textContainer.lineFragmentPadding = 0;
  _textView.layoutManager.allowsNonContiguousLayout = NO;
  _textView.showsVerticalScrollIndicator = NO;
  _textView.showsHorizontalScrollIndicator = NO;
  }
  return _textView;
  }

1、显示
NSAttributedString *attributedString = [[NSAttributedString alloc] initWithData:[content dataUsingEncoding:NSUnicodeStringEncoding] options:@{ NSDocumentTypeDocumentAttribute: NSHTMLTextDocumentType } documentAttributes:nil error:nil];
self.textView.attributedText = attributedString;

2、改变超链接文字颜色（linkTextAttributes 超链接相关属性）去掉下划线接口返回的HTML可以处理，自己也可以处理
self.textView.linkTextAttributes = @{NSForegroundColorAttributeName:[UIColor redColor]};

3、超链接点击事件
UITextViewDelegate
- (BOOL)textView:(UITextView *)textView shouldInteractWithURL:(NSURL *)URL inRange:(NSRange)characterRange {
//URL:就是那个跳转链接
NSString *urlStr = URL.absoluteString;
ViewController *vc = [[ViewController alloc] initWithRequestUrl:urlStr];
[self.navigationController pushViewController:vc animated:YES];
//返回NO，如果返回YES就会跳到Safari
return NO;
}