ios - ContainerViewController委托(delegate)给ChildViewController

ContainerViewController将方法-delegateMethod委派给ChildViewController。
但是在以下代码中，未调用-delegateMethod。
我认为这是因为_childViewController已发布。
我如何解决它使运行-delegateMethod？

ContainerViewController.h

@protocol ContainerViewDelegate <NSObject>

- (void)delegateMethod;

@end

@interface ContainerViewController : UIViewController

@property (nonatomic, assign) id<ContainerViewDelegate> delegate;

@end

ContainerViewController.m

@interface ContainerViewController () {
    ChildViewController *_childViewController;
}

//...

- (void)viewDidLoad
{
    _childViewController = [[WeeklyViewController alloc]init];
    [self addChildViewController:_childViewController];
    [self.view addSubview:_childViewController.view];
    [_childViewController didMoveToParentViewController:self];
}

- (void)buttonAction {
    [self.delegate delegateMethod];
}

ChildViewController.m

@interface ChildViewController () <ContainerViewDelegate>

//...

- (void)delegateMethod {
    NSLog(@"succeed!");
}

最佳答案

您永远不会设置委托，因此self.delegate将为nil。你应该做这个，

    - (void)viewDidLoad
{
    _childViewController = [[WeeklyViewController alloc]init];
    self.delegate = _childViewController;
    [self addChildViewController:_childViewController];
    [self.view addSubview:_childViewController.view];
    [_childViewController didMoveToParentViewController:self];
}

关于ios - ContainerViewController委托(delegate)给ChildViewController，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/30159578/