为UIWebView添加单击及左右滑动操作

在ＨＴＭＬ所在的字符串中合并以下代码

	htmlstring = [htmlstring stringByAppendingString:@"<script language=\"javascript\"> \
			  document.ontouchstart=function(e){ \
			  e.preventDefault(); \
			  if(e.touches.length == 1){ \
			  document.location=\"myweb:touch:start:\" + e.touches[0].pageX + \":\" + e.touches[0].pageY ;  \
			  } \
			  }; document.ontouchend=function(e){ \
			  e.preventDefault(); \
			  if(e.changedTouches.length == 1){ \
			  document.location=\"myweb:touch:end:\" + e.changedTouches[0].pageX + \":\" + e.changedTouches[0].pageY ;  \
			  } \
			  }; document.ontouchmove=function(e){          \
			  e.preventDefault(); \
			  if(e.touches.length == 1){ \
			  document.location=\"myweb:touch:move:\" + e.touches[0].pageX + \":\" + e.touches[0].pageY ;  \
			  } \
			  }  </script>"];

设置UIWebView委托后

NSInteger startPointX;
NSInteger startPointY;

- (BOOL)webView:(UIWebView*)webView shouldStartLoadWithRequest:(NSURLRequest*)request navigationType:(UIWebViewNavigationType)navigationType {
    NSString *requestString = [[request URL] absoluteString];
    NSArray *components = [requestString componentsSeparatedByString:@":"];
    if ([components count] > 1 && [(NSString *)[components objectAtIndex:0] isEqualToString:@"myweb"]) {
        if([(NSString *)[components objectAtIndex:1] isEqualToString:@"touch"]) 
        {
			if ([(NSString *)[components objectAtIndex:2] isEqualToString:@"start"]) {
				startPointX = [(NSString *)[components objectAtIndex:3] intValue];
				startPointY = [(NSString *)[components objectAtIndex:4] intValue];
			}else if ([(NSString *)[components objectAtIndex:2] isEqualToString:@"end"]) {
				NSInteger endPointX;
				NSInteger endPointY;
				endPointX = [(NSString *)[components objectAtIndex:3] intValue];
				endPointY = [(NSString *)[components objectAtIndex:4] intValue];
				if (fabsf(endPointY - startPointY) <= 50 && fabsf(endPointX - startPointX) >= 12 ) {
					if (endPointX > startPointX ) {
						[self swipeRightAction];
					}else {
						[self swipeLeftAction];
					}
				}
				if (startPointX == endPointX && startPointY == endPointY) {
					[self swipeAction];
				}
			}
            NSLog(@"%@,x:%@,y:%@",[components objectAtIndex:2],[components objectAtIndex:3],[components objectAtIndex:4]);
        }
        return NO;
    }
    return YES;
}