基于NSTableViewCell的objective-c-context菜单

在IB中,如果将NSTableView拖到窗口/视图上,您​​会注意到这是表的菜单.

因此,实现上下文菜单的一个非常简单的方法是将该插座连接到存根菜单,并将菜单的代理插座连接到实现NSMenuDelegate协议方法的对象 – (void)menuNeedsUpdate :((NSMenu *)菜单

通常,菜单的委托是向表提供数据源/委托的同一个对象,但它也可能是拥有该表的视图控制器.

Have a look at the docs了解更多信息

Theres一系列聪明的东西,你可以在协议中执行,但一个非常简单的实现可能如下所示

#pragma mark tableview menu delegates

- (void)menuNeedsUpdate:(NSMenu *)menu
{
NSInteger clickedrow = [mytable clickedRow];
NSInteger clickedcol = [mytable clickedColumn];

if (clickedrow > -1 && clickedcol > -1) {



   //construct a menu based on column and row   
   NSMenu *newmenu = [self constructMenuForRow:clickedrow andColumn:clickedcol];

   //strip all the existing stuff       
   [menu removeAllItems];

   //then repopulate with the menu that you just created        
   NSArray *itemarr = [NSArray arrayWithArray:[newmenu itemArray]];
   for(NSMenuItem *item in itemarr)
   {
      [newmenu removeItem:[item retain]];
      [menu addItem:item];
      [item release];
   }        
}

}

然后一个方法来构建菜单.

-(NSMenu *)constructMenuForRow:(int)row andColumn:(int)col
{

    NSMenu *contextMenu = [[[NSMenu alloc] initWithTitle:@"Context"] autorelease];

Nsstring *title1 = [Nsstring stringWithFormat:@"Delete %@",[self titleForRow:row]]; 

NSMenuItem *item1 = [[[NSMenuItem alloc] initWithTitle:title1 action:@selector(deleteObject:) keyEquivalent:@""] autorelease];
    [contextMenu addItem:item1];
    //
Nsstring *title2 = [Nsstring stringWithFormat:@"Save %@",[self titleForColumn:col]];    

NSMenuItem *item2 = [[[NSMenuItem alloc] initWithTitle:title1 action:@selector(saveObject:) keyEquivalent:@""] autorelease];
    [contextMenu addItem:item2];

return contextMenu;
}

你如何选择实现titleForRow：和titleForColumn：取决于你.

请注意,NSMenuItem提供了表示objectObject属性,以允许您将任意对象绑定到菜单项,从而将信息发送到您的方法(例如deleteObject