如何禁用 QLPreviewController 的长按手势

Question

我有一个UIView 作为主视图，并在预览文档时添加一个QLPreviewController 作为子视图。我想限制长按手势，以便没有人可以从文档中复制内容。我试过以下代码：

代码片段：

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

longPress.allowableMovement=100; 

longPress.minimumPressDuration=0.3; 
longPress.delegate=self; 
longPress.delaysTouchesBegan=YES;
longPress.delaysTouchesEnded=YES;

longPress.cancelsTouchesInView=YES; 
[previewController.view addGestureRecognizer:longPress]; 
[self.view addSubview:previewController.view];

但没有成功。谁能告诉我哪里出了问题以及如何禁用长按手势？

我也试过了：

NSArray *arr = previewController.view.gestureRecognizers;

for (int i = 0; i < arr.count; i++) {

     if ([[arr objectAtIndex:i] isKindOfClass:[UILongPressGestureRecognizer class]]) {

         [previewController.view removeGestureRecognizer:[arr objectAtIndex:i]];
     }
}

Answer 1

你可以这样做，

NSArray *arr = qlPreviewController.gestureRecognizers;

for (int i = 0; i < arr.count; i++) {

    if ([[arr objectAtIndex:i] isKindOfClass:[UILongPressGestureRecognizer class]]) {

        [qlPreviewController removeGestureRecognizer:[arr objectAtIndex:i]];
    }
}

qlPreviewController 是QLPreviewController 对UILongPressGestureRecognizer 的看法的对象！

qlPreviewController 是 view 而不是 viewcontroller 请确保！

更新：

例如;

  QLPreviewController *vc;  

  UIView *qlPreviewController = vc.view;

更新 2：

您可以使用此delegate method 禁用手势识别器！

  - (BOOL) gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldReceiveTouch:(UITouch *)touch
{

    return NO;


 }