Objective C OSX-委托-无法识别的选择器发送到实例

Question

The changeView_ShowContact method will make a view controller to show up just fine. But when I call the changeView_ShowContact from another class it wont work. Im getting an error in the log "unrecognized selector sent to instance."

@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.
}

.

@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.
}

Answer 1

似乎您的contacts在没有实现contacts类中的changeView_ShowContact:情况下采用了callingActions_fromMainNavigation协议。