将子控制器添加到表格视图单元格时不会调用 viewWillAppear [英] viewWillAppear is not called when add child controller to table view cell

问题描述

当我将子视图控制器添加到表格视图单元格时，看起来没有调用子视图控制器的viewWillAppear，只有viewDidAppear.

When I add child view controller to table view cell, it looks like viewWillAppear for child view controller is not called, only viewDidAppear.

表视图控制器方法:

override func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell
{
    let cell = tableView.dequeueReusableCellWithIdentifier("ShopInfoTableViewCell", forIndexPath: indexPath) as! ShopInfoTableViewCell
    self.addChildViewController(self.shopInfoViewController, toView: cell.containerView)
    return cell
}

视图控制器类别方法:

- (void)addChildViewController:(UIViewController *)childController toView:(UIView *)view
{
    [self addChildViewController:childController];
    [view addSubview:childController.view];
    [childController didMoveToParentViewController:self];

    [childController.view mas_makeConstraints:^(MASConstraintMaker *make) {
        make.top.equalTo(view.mas_top);
        make.bottom.equalTo(view.mas_bottom);
        make.left.equalTo(view.mas_left);
        make.right.equalTo(view.mas_right);
    }];
}

知道为什么会这样吗?

推荐答案

- (void)addChildViewController:(UIViewController *)childController toView:(UIView *)view
{
    [self addChildViewController:childController];

    //add this
    [childController beginAppearanceTransition:YES animated:YES];
    [view addSubview:childController.view];
    [childController endAppearanceTransition];

    [childController didMoveToParentViewController:self];

    [childController.view mas_makeConstraints:^(MASConstraintMaker *make) {
        make.top.equalTo(view.mas_top);
        make.bottom.equalTo(view.mas_bottom);
        make.left.equalTo(view.mas_left);
        make.right.equalTo(view.mas_right);
    }];
}

同样，当你想消失时，你应该调用它

Likewise, you should call this when you want to disappear

    [childController beginAppearanceTransition:NO animated:YES];
    [childController.view removeFromSuperview];
    [childController endAppearanceTransition];

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