RxSwift: Two way binding

问题

I used official two-way-binding solution

func <-> <T>(property: ControlProperty<T>, variable: Variable<T>) -> Disposable{
let bindToUIDisposable = variable.asObservable()
    .bindTo(property)

let bindToVariable = property
    .subscribe(onNext: { n in
        variable.value = n
    }, onCompleted:  {
        bindToUIDisposable.dispose()
    })

return Disposables.create(bindToUIDisposable, bindToVariable)
}

Usage: (textField.rx.text <-> object.property).addDisposableTo(disposeBag)

Property definition: var property = Variable<String?>(nil)

1. In onNext method all ok and variable changed its value, but my object.property doesn't changed.
2. Is there any way to set variable current value into ControlProperty inside of <-> method, bcs I need set initial value, before subscribe starts?

回答1:

My fault. I replaced object with another instance after binding

This code works well and control property receive initial value from variable

回答2:

Working in Swift 4

---

Example of two way binding between String & Textfield with MVVM architecture:

• In ViewController:

---

 @IBOutlet weak var emailTextfield: UITextField!
 var viewModel : CCRegisterViewModel?

• In ViewModel:

---

var email = Variable<String>("")

• Use this code in ViewController

---

viewModel?.email.asObservable()
.bind(to: emailTextfield.rx.text)
.disposed(by: disposeBag)

emailTextfield.rx.text.orEmpty.bind(to:viewModel!.email)
.disposed(by: disposeBag)

来源：https://stackoverflow.com/questions/43323049/rxswift-two-way-binding