Reload WebView from Menu Item (OS X) - objective-c

Question

I want to reload a WebView whenever a certain menu item is clicked. Here's my code that's not working. (Assume normal declarations in .h files.)
// AppDelegate.m
#import "AppDelegate.h"
// #import "ViewController.h" (in AppDelegate.h)
#interface AppDelegate ()
#end
#implementation AppDelegate
- (void)applicationDidFinishLaunching:(NSNotification *)aNotification {
// Insert code here to initialize your application
}
- (void)applicationWillTerminate:(NSNotification *)aNotification {
// Insert code here to tear down your application
}
// Menu Item triggers this:
- (IBAction)reloadWebView:(id)sender {
NSLog(#"AppDelegate reloadWebView");
ViewController * vc = [[ViewController alloc] init];
[vc reloadWebView:sender]; // tried this,
[vc.webview reload:sender]; // and this,
[[vc.webview mainFrame] reload]; // and this,
[[vc.webview mainFrame] loadRequest:[NSURLRequest requestWithURL:[NSURL URLWithString:#"http://example.com/"]]]; // and this.
}
#end
// ViewController.m
#import "ViewController.h"
// #property (assign) IBOutlet WebView *webview; (in ViewController.h)
#implementation ViewController
#synthesize webview;
- (void)viewDidLoad {
[super viewDidLoad];
[[webview mainFrame] loadRequest:[NSURLRequest requestWithURL:[NSURL URLWithString:#"http://example.com/"]]]; // this works
}
- (void)setRepresentedObject:(id)representedObject {
[super setRepresentedObject:representedObject];
// Update the view, if already loaded.
}
// Called in AppDelegate:
- (void)reloadWebView:(id)sender {
NSLog(#"ViewController reloadWebView");
// The problem here seems to be: webview == nil
[webview reload:sender]; // also tried this,
[[webview mainFrame] reload]; // and this,
[[webview mainFrame] loadRequest:[NSURLRequest requestWithURL:[NSURL URLWithString:#"http://example.com/"]]]; // and this.
}
#end
This is all my code. I've just started working on this project.
I've tried using a button in the ViewController. That works, but I need this to be a menu item.
Thanks in advance!

Answer 1

instead of creating a new view controller:
ViewController * vc = [[ViewController alloc] init];
try:
ViewController * vc = (ViewController *)[[[NSApplication sharedApplication] mainWindow] contentViewController];
to call the current view controller