尽管有所有方法，但UITableView上的UIMenuController不会显示 [英] UIMenuController On UITableView Does Not Show Up In Spite Of All Methods

问题描述

我有UITableView来显示一些列表.实现了UILongPressGestureRecognizer来接听电话，为此，我想显示用于删除，上传等操作的菜单.

I have UITableView to display some list. Implemented UILongPressGestureRecognizer to get calls and on this I want to display menu for delete, upload, etc actions.

以下是实施

// Registering for long press event

UILongPressGestureRecognizer *lpgr = [[UILongPressGestureRecognizer alloc]
                                          initWithTarget:self
                                          action:@selector(handleLongPress:)];
lpgr.delegate = self;
[self.myTable addGestureRecognizer:lpgr];

长按时，我的控件开始起作用

On Long Press My control comes to function

- (IBAction)handleLongPress:(UILongPressGestureRecognizer *)gestureRecognizer
{
    if (gestureRecognizer.state == UIGestureRecognizerStateBegan)
    {
        CGPoint p = [gestureRecognizer locationInView:self.playbackTable];
        NSIndexPath *indexPath = [self.playbackTable indexPathForRowAtPoint:p];
        if (indexPath == nil)
        {
            NSLog(@"long press on table view but not on a row");
        }
        else
        {
            NSLog(@"long press on table view at section %d row %d", indexPath.section, indexPath.row);
            CGPoint p = [gestureRecognizer locationInView: self.myTable];
            NSIndexPath *indexPath = [self.myTable indexPathForRowAtPoint:p];
            if (indexPath != nil)
            {
                if([self becomeFirstResponder])
                {
                    UIMenuItem *delete = [[UIMenuItem alloc] initWithTitle:@"Delete" action:@selector(deleteFileListItem:)];
                    menu = [UIMenuController sharedMenuController];
                    [menu setMenuItems:[NSArray arrayWithObjects:delete, nil]];
                    [menu setTargetRect:[self.myTable rectForRowAtIndexPath:indexPath] inView:self.myTable];
                    [menu setMenuVisible:YES animated:YES];
                }
            }
        }
    }
}

我还实现了以下方法

-(BOOL)canPerformAction:(SEL)action withSender:(id)sender
{
    if (action == @selector(deleteFileListItem:))
    {
        return YES;
    }
    return NO;
}

-(BOOL)canBecomeFirstResponder
{
    return YES;
}

和

- (void)deleteFileListItem:(id)sender
{
    // Will perform action here
}

请让我知道是否丢失任何东西或我做错了.

Please let me know if anything is missing or I am doing wrong.

推荐答案

将长按手势识别器附加到每个单元格而不是整个表格视图时，我已经成功了.我的猜测是这就是问题所在.

I've been successful when attaching a long press gesture recognizer to each cell, not the entire table view. My guess is that that's the issue here.

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