objective-c - 子视图未在 ContainerView 内滚动 - 目标 C

Question

Container View 固定在屏幕的下半部分，On Button 单击当前容器视图将替换为新的 View Controller。每个子视图的高度大小不同。子视图滚动不起作用。我检查了很多答案，但找到了解决方案。代码是

    UIStoryboard *storyBoard = [UIStoryboard storyboardWithName:@"Main" bundle:[NSBundle mainBundle]];
    UIViewController *viewController = nil;
    viewController = [storyBoard instantiateViewControllerWithIdentifier:@"First"];
    // lets add it to container view
    [viewController willMoveToParentViewController:self];
    [self.containerViewController addSubview:viewController.view];
    [self addChildViewController:viewController];
    [viewController didMoveToParentViewController:self];