如何以编程方式创建Cocoa应用主菜单应用

问题描述

我正在从头开始创建简单的Cocoa应用程序，只是为了学习该过程。

但是我无法创建应用程序菜单。我有以下代码：

- (void)applicationDidFinishLaunching:(NSNotification *)notification {
  [self createMenu];
}

-(void)createMenu
{
   NSMenu* myMenu = [[NSMenu alloc] init];
   Nsstring* quitTitle = @"Quit";
   NSMenuItem* quitMenuItem = [[NSMenuItem alloc] initWithTitle:quitTitle
                                                 action:@selector(terminate:)
                                          keyEquivalent:@"q"];
   [myMenu addItem:quitMenuItem];
   [NSApp setMainMenu:myMenu];
 }

但是，启动应用程序后，当我在菜单栏中单击应用程序名称时，没有任何反应

我想念什么？

预先感谢

解决方法

需要从ApplicationWillFinishLaunching调用

-createMenu（）：菜单本身有一些错误。

#import <Cocoa/Cocoa.h>

@interface AppDelegate : NSObject <NSApplicationDelegate> 
- (void)createMenu;
@end

@implementation AppDelegate

-(void)createMenu {
 NSMenu *menubar = [[NSMenu alloc]init];
 NSMenuItem *menuBarItem = [[NSMenuItem alloc] init];
 [menubar addItem:menuBarItem];
 [NSApp setMainMenu:menubar];
 NSMenu *myMenu = [[NSMenu alloc]init];
 NSString* quitTitle = @"Quit";
 NSMenuItem* quitMenuItem = [[NSMenuItem alloc] initWithTitle:quitTitle
    action:@selector(terminate:) keyEquivalent:@"q"];
   [myMenu addItem:quitMenuItem];
 [menuBarItem setSubmenu:myMenu];   
 }

- (void) applicationWillFinishLaunching: (NSNotification *)notification {
[self createMenu];
}

- (void)applicationDidFinishLaunching:(NSNotification *)notification {
}

@end

int main (){
 NSApplication *application = [NSApplication sharedApplication];
 AppDelegate *appDelegate = [[AppDelegate alloc] init];
 [application setDelegate:appDelegate];
 [application run];
 return 0;
}