Opening web URL with NSButton - Mac OS

This should work:

-(IBAction)pushApp1:(id)sender {
    [[NSWorkspace sharedWorkspace] openURL:[NSURL URLWithString:@"http://stackoverflow.com"]];
}

Code for Swift 3

@IBAction func pushApp1(_ sender: Any) {
    NSWorkspace.shared().open(URL(string: "http://stackoverflow.com")!)
}

swift 5:

@IBAction func gotoSite(_ sender: Any) {

    if let url = URL(string: OFFICIAL_SITE_URL) {
        NSWorkspace.shared.open(url)
    }

}

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