objective-c - cocoa：点击事件重新加载链接怎么办？

Question

button1 按下 google 网站被打开。button2 按下 youtube 网站已打开

在从 Interface Builder 存档或 nib file.webview 加载网页后准备接收器以进行服务

- (void)awakeFromNib {
    NSString *urlString = @"http://www.youtube.com";
    [[webView mainFrame] loadRequest:[NSURLRequest requestWithURL:[NSURL URLWithString:urlString]]];
}

点击事件重新加载链接怎么办？

- (IBAction)menuButtonPressed:(id)sender {
    NSString *urlString = @"http://www.google.com";
    [[webView mainFrame] loadRequest:[NSURLRequest requestWithURL:[NSURL URLWithString:urlString]]];
}