Validate all textfield on button click using RxSwift and RXCocoa

Question

I am new to RxSwift and RxCocoa and I'm learning it.

I want to validate all textfield on button click and based on the validation I need to show alert message to user.

After validation is successful I need to insert record in table.

Refer the following code...

var result = txtFname.rx.text
    result.asObservable().subscribe(onNext: { text in
        if text!.isEmpty {
            self.showAlert(msg: "Plese enter first name.")
            self.txtFname.becomeFirstResponder()
        }
    }).disposed(by: disposeBag)

    result = txtLname.rx.text
    result.asObservable().subscribe(onNext: { text in
        if text!.isEmpty {
            self.showAlert(msg: "Please enter last name.")
            self.txtLname.becomeFirstResponder()
        }
    }).disposed(by: disposeBag)

    result = txtEmail.rx.text
    result.asObservable().subscribe(onNext: { text in

        if text!.isEmpty {
            self.showAlert(msg: "Please enter email id.")
            self.txtLname.becomeFirstResponder()
        }
    }).disposed(by: disposeBag)

   //need to check here if all fields are valid or not 
   //if all fields are valid then insert record....

When I press a button and it check all the validation at one and show alert...

But I want to do like if one validation is fail then it should not go further until previous validation is successful...

I don't know how to achieve this. Any help will be appreciated.

Answer 1

You could do something like this.

  self.button.rx.tap.asObservable()
     .filter({ (_) -> Bool in
        guard !(self.txtFname.text ?? "").isEmpty else {
           self.showAlert(msg: "Please enter first name.")
           self.txtFname.becomeFirstResponder()
           return false
        }

        guard !(self.txtLname.text ?? "").isEmpty else {
           self.showAlert(msg: "Please enter last name.")
           self.txtLname.becomeFirstResponder()
           return false
        }

        guard !(self.txtEmail.text ?? "").isEmpty else {
           self.showAlert(msg: "Please enter email id.")
           self.txtEmail.becomeFirstResponder()
           return false
        }

        return true
     })
     .subscribe { _ in
        // do something when all the fields are valid
        self.showAlert(msg: "All fields are valid")
     }
     .disposed(by: disposeBag)