如何在iOS 8的UIWebView中禁用复制弹出窗口？

我已经阅读了几种关于stackoverflow的解决方案，但这些解决方案都无法在iOS 8.1上运行。我设法从此uiwebview-with-copy-paste-when-displaying-pdf-files中禁用长按，但是我无法获得提供以下内容的弹出式窗口：网址”中的“打开”，“添加到阅读列表”和“复制”。

//NSURL *url = [NSURL URLWithString:@"http://www.google.com/somePdf.pdf"];

NSURL *url = [NSURL URLWithString:@"http://www.google.com/"];
NSURLRequest *requestURL = [NSURLRequest requestWithURL:url];
self.mainWebView.mediaPlaybackRequiresUserAction = NO;
[self.mainWebView.scrollView setBounces:NO];

self.mainWebView.allowsInlineMediaPlayback = YES;
self.mainWebView.delegate = self;

//NSString * jsCallBack = @"window.getSelection().removeAllRanges();";
//[self.mainWebView stringByEvaluatingJavaScriptFromString:jsCallBack];
[self.mainWebView setMultipleTouchEnabled:YES];
[self.mainWebView setScalesPageToFit:YES];
[self.mainWebView loadRequest:requestURL];


UILongPressGestureRecognizer* longPress = [[UILongPressGestureRecognizer alloc] initWithTarget:self action:nil]; // allocating the UILongPressGestureRecognizer

longPress.allowableMovement=100; // Making sure the allowable movement isn't too narrow

longPress.minimumPressDuration=0.3; // This is important - the duration must be long enough to allow taps but not longer than the period in which the scroll view opens the magnifying glass

longPress.delegate=self; // initialization stuff
longPress.delaysTouchesBegan=YES;
longPress.delaysTouchesEnded=YES;

longPress.cancelsTouchesInView=YES; // That's when we tell the gesture recognizer to block the gestures we want

[self.mainWebView addGestureRecognizer:longPress]; // Add the gesture recognizer to the view and scroll view then release
[[self.mainWebView scrollView] addGestureRecognizer:longPress];

我已经在一些随机的pdf上对其进行了测试，由于longPress手势识别器，pdf文本无法选择。但是，在普通站点上，它仍然允许复制弹出窗口。

我将尝试使用此更改的网页设置来编辑网页，但答案是3年...

也许我走错了路？我应该尝试使用WKWebView吗？