I made an app which has a button, when you press it, this calls Disable: method, the button becomes disabled and calling Undo action (simple cmd+Z) should return it to the previous state (enable it). I used NSUndoManager to make this possible, but it doesn't work. It seems I'm missing something essential in my app, but I can't find what exactly.
AppDelegate.h:
AppDelegate.m:
What am I doing wrong?
AppDelegate.h:
Code:
#import <Cocoa/Cocoa.h>
@interface AppDelegate : NSObject <NSApplicationDelegate>
{
NSUndoManager* undoManager;
}
@property (assign) IBOutlet NSWindow *window;
@property (weak) IBOutlet NSButton *button;
- (IBAction)Disable:(id)sender;
@endAppDelegate.m:
Code:
#import "AppDelegate.h"
@implementation AppDelegate
@synthesize window = _window;
- (NSUndoManager*)windowWillReturnUndoManager:(NSWindow*)window
{
return undoManager;
}
- (void)applicationDidFinishLaunching:(NSNotification *)aNotification
{
}
- (id) init
{
if(self = [super init])
undoManager = [[NSUndoManager alloc]init];
return self;
}
- (IBAction)Disable:(id)sender
{
[[undoManager prepareWithInvocationTarget:self]Enable];
[_button setEnabled:NO];
if (![undoManager isUndoing])
[undoManager setActionName:@"Disable"];
}
-(void)Enable
{
[[undoManager prepareWithInvocationTarget:self]Disable:self];
[_button setEnabled:YES];
if (![undoManager isUndoing])
[undoManager setActionName:@"Enable"];
}
@endWhat am I doing wrong?