无法解释“ |”字符，因为相关视图没有超级视图

Question

我知道周围也有同样的问题。但尚未找到任何解决方案。参见下面的代码，我在viewdidLoad中添加一个子视图，并且此控制器在Popover中呈现。

因此，在应用这些约束时，我会收到此错误Unable to interpret '|' character, because the related view doesn't have a superview

    -(void) viewDidLoad
    {

        self.profileHeaderView = [[DSProfileHeaderView alloc] initWithFrame:CGRectZero];
        [self.headerView addSubview:self.profileHeaderView];
        [self.headerView setAccessibilityIdentifier:@"btnYourProfile"];
        self.profileHeaderView.translatesAutoresizingMaskIntoConstraints = false;
        self.profileHeaderView.backgroundColor  = [UIColor whiteColor];

        if (self.viewLoaded) {

            [NSLayoutConstraint activateConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"H:|[view]|" options:0 metrics:nil views:@{ @"view": self.profileHeaderView }]];
            [NSLayoutConstraint activateConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"V:|[view]|" options:0 metrics:nil views:@{ @"view": self.profileHeaderView }]];
        }

        //[self.profileHeaderView addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"H:|-0-[view]-0-|" options:0 metrics:nil views:viewsDictionary]];
        //[self.profileHeaderView addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"V:|-0-[view]-0-|" options:0 metrics:nil views:viewsDictionary]];

    }