UIMenuController didDismiss方法？

Question

我有一个具有didSelectRow方法的UITableView ...它创建一个UIMenuController并显示它。

目前，它工作正常，但当UIMenuController关闭时，我想调用一个[tableView1 deselectRowAtIndexPath:path1 animated:YES];

NSIndexPath *path1;
UITableView *table1;
#pragma maek - Table View
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{


    path1 = indexPath;

    tablview1 = tableview;

        CGRect location = [tableView rectForRowAtIndexPath:indexPath];

    location.origin.y = location.origin.y+30;

    [self becomeFirstResponder];

    UIMenuItem *menuItem = [[UIMenuItem alloc] initWithTitle:@"View Item" action:@selector(viewItem:)];
    UIMenuItem *menuItem1 = [[UIMenuItem alloc] initWithTitle:@"Edit Item" action:@selector(editItem:)];
    UIMenuItem *menuItem3 = [[UIMenuItem alloc] initWithTitle:@"Cancel" action:@selector(cancelSubMenu:)];

    UIMenuController *menuController = [UIMenuController sharedMenuController];
    [menuController setTargetRect:location inView:self.view];
    menuController.menuItems = [NSArray arrayWithObjects:menuItem, menuItem1,menuItem3, nil];

    menuController.arrowDirection = UIMenuControllerArrowUp;

    [menuController setMenuVisible:YES animated:YES];
}

-(IBAction)cancelSubMenu:(id)sender 
{
    [tableView1 deselectRowAtIndexPath:path1 animated:YES]; 
}

-(BOOL)canBecomeFirstResponder 
{
    return YES; 
}

-(BOOL)canPerformAction:(SEL)action withSender:(id)sender 
{
    if(action == @selector(viewItem:)){return YES;}
    if(action == @selector(editItem:)){return YES;}
    if(action == @selector(cancelSubMenu:)){return YES;}

    return NO; 
}

当用户点击UIMenuController上的cancel按钮时，该行被正确地取消选择。但是，当用户点击屏幕上的其他位置时，UIMenuControlller将关闭，但该行仍处于选中状态。

有没有某种didDismiss UIMenuController方法？

Answer 1

UIMenuController将在隐藏名为UIMenuControllerDidHideMenuNotification后立即发布一个通知，您可以订阅此通知来调用一个方法，该方法将在您的表视图上调用deselectRowAtIndexPath。例如：

[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(yourMethodHere) name:UIMenuControllerDidHideMenuNotification object:nil];

在Swift 5中：

NotificationCenter.default.addObserver(self,
                                       selector: #selector(self.receiveNotification(_:)),
                                       name: UIMenuController.didShowMenuNotification,
                                       object: nil)

并处理通知：

@objc func receiveNotification(_ notification: Notification) {
    // do something here
}