ios - 从另一个容器视图控制器访问容器视图控制器

Question

我有一个父视图控制器和两个容器，如下所示：

UIStoryboard* storyboard = [UIStoryboard storyboardWithName:@"MainStoryboard" bundle:nil];
MyCombinationsViewController *myComb = [storyboard instantiateViewControllerWithIdentifier:@"MyCombinationsViewControllerID"];
myComb.view.frame = self.combinationsContainer.bounds;
[self.combinationsContainer addSubview:myComb.view];
[self addChildViewController:myComb];
[myComb didMoveToParentViewController:self];

StatInfoViewController *stat = [storyboard instantiateViewControllerWithIdentifier:@"StatInfoViewControllerID"];
stat.view.frame = self.statContainer.bounds;
[self.statContainer addSubview:stat.view];
[self addChildViewController:stat];
[stat didMoveToParentViewController:self];

StatInfoViewController我想在那个效果里面做点什么MyCombinationsViewController。如何在不重新分配的情况下访问 MyCombinationsViewController 属性？

这样做：

UIStoryboard* storyboard = [UIStoryboard storyboardWithName:@"MainStoryboard" bundle:nil];
MyCombinationsViewController *myComb = [storyboard instantiateViewControllerWithIdentifier:@"MyCombinationsViewControllerID"];

StatInfoViewController当我尝试执行类似的操作时，内部返回空属性NSLog(@"%@",myComb.something);

Answer 1

您可以将它们链接在一起，通过在 StatInfoViewController 的标题中添加：

@property (nonatomic, weak) MyCombinationsViewController* myCombinationsViewController

然后在分配它们时执行以下操作：

StatInfoViewController *stat = [storyboard instantiateViewControllerWithIdentifier:@"StatInfoViewControllerID"];
UIStoryboard* storyboard = [UIStoryboard storyboardWithName:@"MainStoryboard" bundle:nil];
MyCombinationsViewController *myComb = [storyboard instantiateViewControllerWithIdentifier:@"MyCombinationsViewControllerID"];

stat.myCombinationsViewController = myComb;


myComb.view.frame = self.combinationsContainer.bounds;
[self.combinationsContainer addSubview:myComb.view];
[self addChildViewController:myComb];
[myComb didMoveToParentViewController:self];

stat.view.frame = self.statContainer.bounds;
[self.statContainer addSubview:stat.view];
[self addChildViewController:stat];
[stat didMoveToParentViewController:self];

然后您可以从 StatInfoViewController 内部访问 myCombinationsViewController