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UIWebView之获取所点位置图片URL
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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
{
//	<Find HTML tag which was clicked by user>
//	<If tag is IMG, then get image URL and start saving>
	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。


原文链接:http://blog.csdn.net/favormm/article/details/6614441
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长平狐
发帖于5年前 0回/346阅
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