Question

我成功地在容器视图中嵌入和交换uiviewcontrollers。现在我想从子uiviewcontrollers发送消息到父uivewcontroller。我将它们作为代理连接起来，但无法弄清楚如何在父视图中将其指定为委托

parent.h -load delegate

// Import child delegates
#import "GenWarnDangerVC.h"

@interface Appliance_IPVC : UIViewController <ChildViewControllerDelegate>
{
}

parent.m -load子视图

- (void)viewDidLoad
{
    [super viewDidLoad];

    // * Add child views

    [self addChildViewController:[self.storyboard instantiateViewControllerWithIdentifier:@"ChildFour"]];
    [self addChildViewController:[self.storyboard instantiateViewControllerWithIdentifier:@"ChildOne"]]; // <-- this is the delegate
    [self addChildViewController:[self.storyboard instantiateViewControllerWithIdentifier:@"ChildTwo"]];
    [self addChildViewController:[self.storyboard instantiateViewControllerWithIdentifier:@"ChildThree"]];

    self.currentChildController = self.childViewControllers[0];


    self.currentChildController.view.frame = self.containerView.bounds;
    [self.containerView addSubview:self.currentChildController.view];

    for (UIViewController *controller in self.childViewControllers)
        [controller didMoveToParentViewController:self];

    // Tried making it delegate here, complies but zilch happens
    UIStoryboard *storyboard = self.storyboard;
    GenWarnDangerVC *_GenWarnDangerVC  = [storyboard instantiateViewControllerWithIdentifier:@"ChildOne"];
    _GenWarnDangerVC.delegate=self;

}

我们稍后在运行时使用

进行切换

[self transitionFromViewController:oldController toViewController:newController duration:0.33 options:options animations:^{} completion:nil];

childview.h - 委托设置内容

#import <UIKit/UIKit.h>

@protocol ChildViewControllerDelegate;

@interface GenWarnDangerVC : UIViewController <UITextViewDelegate>

@property (nonatomic, weak) id<ChildViewControllerDelegate> delegate;

@end


@protocol ChildViewControllerDelegate <NSObject>
- (void)animateTextField:(BOOL)up;
@end

childview.m - 向父母发送讯息

- (BOOL)textViewShouldBeginEditing:(UITextView *)textView;
{
    //if ([self.delegate respondsToSelector:@selector(animateTextField:)])
    //{
        // Sending delegate message
        NSLog(@"Sending delegate message");
        [self.delegate animateTextField:YES];
    //}

    return YES;
}

父视图永远不响应，它在父视图（本身）中调用时处理[self animateTextField：YES]但从未从子视图“听到”。

我猜是因为我们需要在父视图中告诉子视图谁是委托人，例如

UIStoryboard *storyboard = self.storyboard;
    GenWarnDangerVC *_GenWarnDangerVC  = [storyboard instantiateViewControllerWithIdentifier:@"ChildOne"];
    _GenWarnDangerVC.delegate=se

LF;

但是（a）到底是什么？并且（b）是否在加载cild视图时完成？或者他们被交换？

Answer 1

问题在于我如何初始化子控制器

[self addChildViewController:[self.storyboard instantiateViewControllerWithIdentifier:@"ChildOne"]];

这会加载控制器，但没有给自己留下引用，因此可以为其分配一个委托。

然而，这确实如此。耶。

GenWarnDangerVC * GenWarnDanger_vc = [self.storyboard instantiateViewControllerWithIdentifier:@"ChildOne"];
[self addChildViewController:GenWarnDanger_vc];
GenWarnDanger_vc.delegate = self;

将父uiviewcontroller链接为addChildViewController添加的uivewcontroller的委托

1 个答案: