Question

我有一个UIView作为主视图，并在预览文档时添加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。我尝试了以下代码：

代码段：

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。谁能告诉我哪里出错了？如何禁用长按手势呢？

我也试过这个：

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

你可以做点什么，

NSArray *arr = qlPreviewController.gestureRecognizers;

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

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

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

{p> qlPreviewController是QLPreviewController的{{1}}视图的对象！

UILongPressGestureRecognizer qlPreviewController而非view确保！

更新：

例如

;

viewcontroller

更新2：

您可以使用此QLPreviewController *vc; UIView *qlPreviewController = vc.view;来禁用手势识别器！

delegate method

如何禁用QLPreviewController的长按手势

1 个答案: