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。 关面说到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: -(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。 |