Objective c objective C OSX-委托-从另一个类调用子类（不是作为实例）

我正在尝试一个代理，但它不起作用。 changeView\u ShowContact方法将使视图控制器显示良好。但是，当我从另一个类调用changeView\u ShowContact时，它将不起作用

@protocol callingActions_fromMainNavigation <NSObject>
    - (IBAction)changeView_ShowContact:(id)sender;
@end

**@interface Navigation_Main : NSViewController**
@property (nonatomic, strong) id <callingActions_fromMainNavigation> delegate;

**@implementation Navigation_Main** 
@synthesize delegate;

- (IBAction)changeView_ShowContact:(id)sender;
{
    NSLog(@"********************ShowContact");
    AddStuffViewController = [[pageContact alloc] initWithNibName:@"pageContact" bundle:nil];
    [AddStuffView addSubview:[AddStuffViewController view]]; //<This call here works ok.
}

主导航中的协议调用操作 -（iAction）changeView\u ShowContact:（id）发件人； @结束 **@界面导航\u主：NSViewController** @属性（非原子，强）id委托； **@实现导航_Main** @综合代表； -（iAction）changeView\u ShowContact:（id）发件人； { NSLog（@“************************显示联系人”）； AddStuffViewController=[[pageContact alloc]initWithNibName:@“pageContact”捆绑包：nil]；

---

[AddStuffView addSubview:[AddStuffViewController view]]；//当使用类的非共享实例（不是单例的对象）时，为什么希望一个类的新初始化实例共享对任何其他引用的引用？那将是一场灾难！您需要获得对该视图控制器的有效引用（理想情况下）拥有

contacts

对象，而不是尝试初始化自己的对象，并祈祷出现重大malloc（）错误。我已修复了您的代码（包括某些类的名称）：

//为了安全起见，即使是代理也需要标准的“名称空间”前缀
@协议C接触
-（iAction）changeView\u ShowContact:（id）发件人；
@结束
//对于一个类来说，这是一个糟糕的名字。类别是唯一的类
//这应该使用下划线中间名，甚至只有在编译时才使用下划线
@接口CFIMainNavigationViewController:NSViewController
//代表**永远**坚强
@属性（非原子，弱）id委托；
@CFIMainNavigationViewController的实现
//@不必要的；不必要的
-（iAction）changeView\u ShowContact:（id）发件人；
{
NSLog（@“************************显示联系人”）；
AddStuffViewController=[[pageContact alloc]initWithNibName:@“pageContact”捆绑包：nil]；
[AddStuffView addSubview:[AddStuffViewController视图]]//
@interface contacts : NSObject <callingActions_fromMainNavigation>

**@implementation contacts**
-(void)myMethodCall:(id)sender;
{
    Navigation_Main *NavMain = [[Navigation_Main alloc] initWithNibName:@"Navigation_Main.h" bundle:nil];
    [NavMain setDelegate:self];
    [self changeView_ShowContact:nil];
//I need to call the (IBAction)changeView_ShowContact in the Main Navigation. This 
//code is not working.
}

- (IBAction)changeView_ShowContact:(id)sender;
{
}

//Even delegates need a standard "namespace" prefix for safety
@protocol CFIContactsNavigation<NSObject>
    - (IBAction)changeView_ShowContact:(id)sender;
@end

// This is a terrible name for a class.  Categories are the only classes
// that should use underscores mid-name, and even then only when compiled
@interface CFIMainNavigationViewController : NSViewController
//delegates are **never** strong
@property (nonatomic, weak) id <CFIContactsNavigation> delegate;

@implementation CFIMainNavigationViewController
//@synthesize delegate;  unnecessary

- (IBAction)changeView_ShowContact:(id)sender;
{
    NSLog(@"********************ShowContact");
    AddStuffViewController = [[pageContact alloc] initWithNibName:@"pageContact" bundle:nil];
    [AddStuffView addSubview:[AddStuffViewController view]]; //<This call here works ok.

    CFIContacts *contacts = [CFIContacts new];
    [self setDelegate:contacts];
    [contacts setNavMain:self];
}

//Again, terrible name for a class.  Also, it's missing an @end
@interface CFIContacts : NSObject <CFIContactsNavigation>

@property (nonatomic, weak) CFIMainNavigationViewController *navMain;

@end

@implementation CFIContacts
-(void)myMethodCall:(id)sender;
{
    //instance names are pascal-cased
    // CFIMainNavigationViewController *navMain = [[Navigation_Main alloc] initWithNibName:@"Navigation_Main.h" bundle:nil];
    [self.mainNav changeView_ShowContact:nil];
//I need to call the (IBAction)changeView_ShowContact in the Main Navigation. This 
//code is not working.
}

//Why the heck are there a pair of parenthesis *and* a semicolon?  
// this would never compile
- (IBAction)changeView_ShowContact:(id)sender { }

//...

@end