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UIWebView之获取所点位置的图片标签和src

UIWebView有自己的UIResgure,如果我们手动加入自己的GestureRecognize将不能识别,如UILongPressGestureRecongnizer. 在浏览网页的时候,如果看到喜欢的图片,想把它保存下来如何办呢? 我们可以自己写一个程序来实现,用uiwebview开发一个自己的浏览器。

上面说到uiwebview不能识别long press gesture,幸好有一个可以识别,那就是double click.因此我们注册它,代码如下

UITapGestureRecognizer *doubleTap = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(doubleTap:)];  doubleTap.numberOfTouchesRequired = 2;  [self.theWebView addGestureRecognizer:doubleTap];

然后就是实现doubleTap:

view plain-(void) doubleTap :(UITapGestureRecognizer*) sender  {      int scrollPositionY = [[self.theWebView stringByEvaluatingJavaScriptFromString:@"window.pageYOffset"] intValue];      int scrollPositionX = [[self.theWebView stringByEvaluatingJavaScriptFromString:@"window.pageXOffset"] intValue];            int displayWidth = [[self.theWebView stringByEvaluatingJavaScriptFromString:@"window.outerWidth"] intValue];      CGFloat scale = theWebView.frame.size.width / displayWidth;            CGPoint pt = [sender locationInView:self.theWebView];      pt.x *= scale;      pt.y *= scale;      pt.x += scrollPositionX;      pt.y += scrollPositionY;            NSString *js = [NSString stringWithFormat:@"document.elementFromPoint(%f, %f).tagName", pt.x, pt.y];      NSString * tagName = [self.theWebView stringByEvaluatingJavaScriptFromString:js];      if ([tagName isEqualToString:@"img"]) {          NSString *imgURL = [NSString stringWithFormat:@"document.elementFromPoint(%f, %f).src", pt.x, pt.y];          NSString *urlToSave = [self.theWebView stringByEvaluatingJavaScriptFromString:imgURL];          NSLog(@"image url=%@", urlToSave);      }  }  

这样我们就可以得到图片的url,然后下载保存就行了。