KhoaVanNguyen

  var query: NSMetadataQuery? {
        willSet {
            if let query = self.query {
                query.stop()
            }
        }
    }

    public func doSpotlightQuery() {
        query = NSMetadataQuery()

KhoaVanNguyen

public string GeneratePdfWithOffice(string sourceUrl, string pdfPath, string lookupCode)
        {
            try
            {
                Microsoft.Office.Interop.Excel.Application app = new Microsoft.Office.Interop.Excel.Application();
                app.Visible = false;
                Microsoft.Office.Interop.Excel.Workbook wkb = app.Workbooks.Open(sourceUrl);
                wkb.ExportAsFixedFormat(Microsoft.Office.Interop.Excel.XlFixedFormatType.xlTypePDF, pdfPath);
                wkb.Close();
                app.Quit();

KhoaVanNguyen

func login() {
    guard let username = usernameTF.text, isValid(username: username) else {
        // wrong username format
        return
    }
    // do register here
}

func isValid(username: String) -> Bool {
    // check username trùng

KhoaVanNguyen

if let username = usernameTF.text {
    if let password = passwordTF.text {
        // Do register user here
    }else {
        // Alert no password
    }
}else {
    // Alert no username
}

KhoaVanNguyen

guard DataService.ds.introImage != nil else {
    showAlert(title: Settings.General.appName, message: Settings.Error.noIntroImage)
    return
}
guard DataService.ds.photoImage != nil  else {
    showAlert(title: Settings.General.appName, message: Settings.Error.noPhotoImage)
    return
}
guard DataService.ds.videoImage != nil else {
    showAlert(title: Settings.General.appName, message: Settings.Error.noVideoImage)

KhoaVanNguyen

guard let username = usernameTF.text, username.characters.count >= 6 else {
    // wrong username format
    return
}
guard let password = passwordTF.text, password.characters.count >= 6 else {
    // wrong password format
    return
}
// do register user here

KhoaVanNguyen

```swift
func printNames( names : String... ){
    for name in names{
        print(name)
    }
}

printNames(names: "Swift","Go","Python","Java","C++")
```

KhoaVanNguyen

 func reserveGeo(){
        let geoCoder = CLGeocoder()
        geoCoder.reverseGeocodeLocation(userLocation, completionHandler: { (placemarks, error) in
            guard let addressDict = placemarks?[0].addressDictionary else {
                return
            }
            if let formattedAddress = addressDict["FormattedAddressLines"] as? [String] {
                let address  = formattedAddress.joined(separator: ", ")
                
                // set value to your control

KhoaVanNguyen

  override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?){
        if touches.first?.view != subView{
            // subView is your view
            dismiss(animated: true, completion: nil)
        }
    }

KhoaVanNguyen

func findIndex(of number : Int , in array : [Int] ) -> Int?{
    
    for ( index, value ) in array.enumerated(){
        if value == number {
            return index
        }
    }
    return nil
}
// call it