无法将消息发送到其他ViewController [英] Cannot Send Message to Other ViewController

问题描述

当我需要从FlipsideViewController.m向MainViewController.m发送消息时，我正在搞乱Xcode的创建....除此以外，尽管我将方法放在MainViewController.h中，但我从中发送消息的ViewController并不会检测到该方法是否存在.这是方法:

I was messing around in Xcode creating... something... when I needed to send a message to the MainViewController.m from the FlipsideViewController.m. Except, when I do, the ViewController I am sending the message from does not detect the method as existing, despite the fact that I put the method in MainViewController.h. This is the method:

- (void)setAutosave:(BOOL)boolee {
    _autosave = boolee;
}

我已经将MainViewController导入到FlipsideViewController中，但是当我称之为([NSMainViewController setAutosave:_autosave];)时，它只会引发错误:

I have imported the MainViewController into the FlipsideViewController, but as I call it ([NSMainViewController setAutosave:_autosave];), it simply throws an error:

No known class method for selector 'setAutosave:'

之所以这样做，是因为FlipsideViewController中具有分段控件，该控件告诉autosave处于打开或关闭状态，但是它需要将其值发送给另一个ViewController.

I am doing this because FlipsideViewController has a segmented control in it, which tells autosave to be on or off, but it needs to send it's value to the other ViewController.

我真的很为难，不胜感激.

I really am stumped, help is appreciated.

推荐答案

MainViewController是一个类，您无法从该类访问实例方法.

MainViewController is a class, you can't access instance method from a class.

您可以向FlipsideViewController添加属性，例如:

You can add a property to FlipsideViewController, for example:

@property (weak, nonatomic) MainViewController *mainViewController;

将MainViewController实例分配给mainViewController(分配方法取决于两个视图控制器之间的关系)，然后可以通过[self.mainViewController setAutosave:_autosave];调用该方法.

Assign your MainViewController instance to mainViewController (how to assign depends on the relationship between your two view controllers), then you can invoke that method by [self.mainViewController setAutosave:_autosave];.

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