从另一个视图控制器调用One View控制器的方法

问题描述：

我在OneViewController.h中声明了一个方法someMethod

I have a method "someMethod" declared in OneViewController.h

@interface OneViewController
{
UIView *tempView;
..

}
-(void) someMethod ;
@end

并在OneViewController.m文件中实现

and implemented in OneViewController.m file

@implementation OneViewController

-(void) someMethod 
{
tempView = [[UIView alloc]initWithFrame:CGRectMake(100, 50, 200, 250)];
tempView.backgroundColor = [UIColor yellowColor];
if([[self.view subviews] containsObject:tempView])
[tempView removeFromSuperView];
   else
   [self.view addsubview:tempView];

}

我想打电话给 someMethod 当出现在不同的viewController - secondViewController

I want to call someMethod when present at different viewController - secondViewController

（类似 [OneViewController someMethod] ），这样当我回来到OneViewController我可以看到 someMethod 所做的更改。

(something like [OneViewController someMethod]), So that when I get back to OneViewController I can see the changes made by someMethod.

我是否需要使用appDelegate方法？

Do I need to use appDelegate methods?

我试过以下但是它不起作用。

I have tried following but it doesn't work.

neViewController *newViewController = [[OneViewController alloc] init];
[newViewController someMethod];

感谢您提前获得任何帮助..

Thanks for any help in advance..

答

在SecondViewController中，声明OneViewController类的引用。您可以指定属性。在移动到SecondViewController之前设置引用。现在有了引用，你可以调用实例方法 [_ oneView someMethod] 。

In the SecondViewController, declare a reference for OneViewController class. You can have assign property. Set the reference before you move to SecondViewController. Now with the reference, you can call the instance method [_oneView someMethod].

编辑：

声明

OneViewController *_oneView;

同时添加assign属性，

Also add the assign property,

@property(nonatomic,assign) OneViewController *_oneView;

在.m文件中合成变量。

Synthesize the variable in .m file.

从OneViewController显示SecondViewController时，只需添加以下行。

While showing the SecondViewController from OneViewController, just add the following line.

secondView._oneView = self;

从另一个视图控制器调用One View控制器的方法

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