ios - 如何从 uitextview 中提取链接并从 facebook 或 twitter 等链接中加载图像？

Question

我想从 uitextview 中提取链接并从链接中加载图像。例子是这样的 https://www.google.com/search?q=twitter+link&espv=2&biw=1380&bih=689&source=lnms&tbm=isch&sa=X&ved=0ahUKEwiH5I2DsbXLAhVRJI4KHXCcD-YQ_AUIBigB#tbm=isch&q=twitter+link+preview&imgrc=ID-I2bdqhuiYZM%3A .我该怎么做？

Answer 1

这是代码。

- (void)viewDidLoad
{
   [super viewDidLoad];
    NSString * testStr=@"The world’s most popular camera is more advanced than ever. The 12-megapixel iSight camera captures sharp, detailed photos. It takes brilliant 4K video, up to four times the resolution of 1080p HD video. http://cdn2.gsmarena.com/vv/bigpic/apple-iphone-6s1.jpg. iPhone 6s also takes selfies worthy of a self-portrait with the new 5-megapixel FaceTime HD camera. And it introduces Live Photos, a new way to relive your favourite memories. It captures the moments just before and after your picture and sets it in motion with just the press of a finger.";
    [self identifyTextContent:testStr];
}

-(void)identifyTextContent :(NSString *)txtvwstr
{
     NSMutableAttributedString *attributedString = [[NSMutableAttributedString alloc] initWithString:txtvwstr];
     NSTextAttachment *textAttachment = [[NSTextAttachment alloc] init];
     NSDataDetector *detector = [NSDataDetector dataDetectorWithTypes:NSTextCheckingTypeLink error:nil];
     [detector enumerateMatchesInString:txtvwstr options:kNilOptions range:NSMakeRange(0, [txtvwstr length]) usingBlock:^(NSTextCheckingResult *result, NSMatchingFlags flags, BOOL *stop) {
      NSLog(@"Values: %@", result);
        if (result.resultType == NSTextCheckingTypeLink)
        {
           NSLog(@"matched: %@",result.URL);
         //**You can use [SDWebImage][1] library to download the image from detected url.**//
           NSData *data = [NSData dataWithContentsOfURL:result.URL];
           UIImage *img = [[UIImage alloc] initWithData:data];
           textAttachment.image = img;
           NSAttributedString *attrStringWithImage = [NSAttributedString attributedStringWithAttachment:textAttachment];
           [attributedString replaceCharactersInRange:result.range withAttributedString:attrStringWithImage];
        }
     }];
 //**HERE _txtVwData is my UITextView outlet.**
  _txtVwData.attributedText=attributedString;
}

希望对您有所帮助。谢谢。

这是输出屏幕。