大家常常在開發中會碰到這樣的需求–禁用網頁或PDF檔案中放大鏡及拷貝貼上彈出框
查詢了很多資料發現如下方法已經失效

webView.stringByEvaluatingJavaScriptFromString("document.documentElement.style.webkitUserSelect='none';")
webView.stringByEvaluatingJavaScriptFromString("document.documentElement.style.webkitTouchCallout='none';")

你可以試一下如下方法

由於網頁長按手勢預設時間是0.5秒，所有我們在設定長按手勢時間要小於0.5秒就行

-(void)createUI{
    _myWebView = [[UIWebView alloc]initWithFrame:self.view.bounds];
    NSURL * url = [NSURL URLWithString:@"http://www.baidu.com"];
    [_myWebView loadRequest:[NSURLRequest requestWithURL:url]];
    [self.view addSubview:_myWebView];

//    載入pdf檔案方法

//    NSString *path = [[NSBundle mainBundle] pathForResource:@"sample" ofType:@"pdf"];
 

//    
//    NSURLRequest* pdfRequest = [NSURLRequest requestWithURL:[NSURL fileURLWithPath:path]];
//    [_myWebView loadRequest:pdfRequest];

    UILongPressGestureRecognizer *longPress = [[UILongPressGestureRecognizer alloc] initWithTarget:self action:nil];
    longPress.delegate = self;   //記得在.h檔案里加上<UIGestureRecognizerDelegate>委託
 

    longPress.minimumPressDuration = 0.4;  //這裡為什麼要設定0.4，因為只要大於0.5就無效，我想是因為預設的跳出放大鏡的手勢的長按時間是0.5秒，

    [_myWebView addGestureRecognizer:longPress];
}



#pragma mark - GestureRecognizerDelegate
- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldRecognizeSimultaneouslyWithGestureRecognizer:(UIGestureRecognizer *)otherGestureRecognizer
{
    return NO; //這裡一定要return NO,至於為什麼大家去看看這個方法的文件吧。

}