Objective-c：如何在容器视图控制器中调用方法 [英] Objective-c: How to invoke method in container view controller

问题描述

。感谢@Julian！

with isKindOfClass. Thanks to @Julian!

-(void)callContainerViewController {
for (UIViewController *childViewController in [self childViewControllers])
{
    if ([childViewController isKindOfClass:[ContainerViewController class]])
    {
        //found container view controller
        ContainerViewController *cvc = (ContainerViewController *)childViewController;

        //do something with your container view viewcontroller
        [cvc callFunction];

        break;
    }
}
}

///

我正在使用故事板。我已经读过容器视图的子视图控制器是自动实例化的。如何从RedViewController调用BlueViewController中的方法？我已经尝试了几种解决方案，但在我的情况下没有任何效果。

I'm using storyboard. I've read that the child view controller of a container view is instantiated automatically. How do I call a method within my BlueViewController from the RedViewController? I've already tried several solutions here, but nothing worked in my case.

结构目前：

EntryViewController.h / .m

..查看

....其他对象

....容器视图

........容器视图RateViewController.h / .m

这是我到目前为止的设置。我需要做什么。我真的想了解这是如何工作的：

Here's my setup so far. What do I need to do. I really want to understand how this works:

/

EntryViewController.h

@interface EntryViewController : UIViewController {
}
@end

/

EntryViewController.m

#import RateViewController.h
@implementation

-(IBAction)callResetScrollViewMethodFromRateViewController {
[RateViewController resetScrollView];
}

@end

/

RateViewController.h

@interface RateViewController : UIViewController {
}
@property (nonatomic, assign) RateViewController *_RateViewControllerProperty;
@property (nonatomic, strong) IBOutlet UIScrollView *Scroller;
@end

/

RateViewController.m

@implementation

-(IBAction)resetScrollView {
[_Scroller setContentOffset:CGPointZero animated:NO];
}

@end

推荐答案

您应该能够通过父级的 childViewControllers 属性访问viewcontroller的子级。 （或者如上所述使用segue）。

You should be able to access the viewcontroller's child through parent's childViewControllers property. (Or using the segue as pointed out above).

例如：

BlueViewController *bvc = self.childViewControllers[0]; //assuming you have only one child 
[bvc someMethod];

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