如果从推送的ViewController调用，UIPopoverController不工作

Question

我正在使用FPPopover库来显示popover。它在使用模型呈现时工作但它在推动的viewcontroller中不起作用。 这里使用代码：

GettingDataForPOPOver *popoverContent = [self.storyboard instantiateViewControllerWithIdentifier:@"POPOVER"];
    popoverContent.delegate = self;
    popoverContent.Tag = 0;
    popover = [[FPPopoverController alloc] initWithViewController:popoverContent];
    popover.contentSize = CGSizeMake(200,210);
    popover.border = NO;
    popover.tint = FPPopoverWhiteTint;
     popover.delegate = self;
    //[popover.navigationController pushViewController:popover animated:NO];
    [popover presentPopoverFromView:okButton];

这个也不起作用：

GettingDataForPOPOver *popoverContent = [self.storyboard instantiateViewControllerWithIdentifier:@"POPOVER"];

    UINavigationController *nc = [[UINavigationController alloc] initWithRootViewController:popoverContent];

    //popoverContent.delegate = self;
    popoverContent.Tag = 0;
    FPPopoverController *popoverr = [[FPPopoverController alloc] initWithViewController:nc];
    popoverr.delegate = self;
    popoverr.tint = FPPopoverDefaultTint;
    popoverr.contentSize = CGSizeMake(200,210);
    [popoverr presentPopoverFromView:okButton];

        CGRect nc_bar_frame = nc.navigationBar.frame;
        nc_bar_frame.origin.y = 0;
        nc.navigationBar.frame = nc_bar_frame;