rac_textSignal in Swift 3 - ios

Question

I am attempting to migrate a Swift 2.2 app that I did not write to Swift 3. All was going well until I ran into some RAC calls. I am not familiar with ReactiveCocoa, which makes this even more challenging.
/**
* Method name: Enable Login Button
* Description: Enable or disable login button based on
* username and password entry
* Parameters: None
*/
func enableLoginButton() -> Void {
self.btnLogin.isEnabled = false
let serviceUrlSignal = self.txtServiceUrl.rac_textSignal()
.toSignalAssumingHot()
.assumeNoErrors()
.map { text in text as! String }
let usernameSignal = self.txtFieldUsername.rac_textSignal()
.toSignalAssumingHot()
.assumeNoErrors()
.map { text in text as! String }
let userNameCharSignal = usernameSignal.map { $0.characters.count }
let passwordSignal = self.txtFieldPassword.rac_textSignal()
.toSignalAssumingHot()
.assumeNoErrors()
.map { text in text as! String }
let passwordCharSignal = passwordSignal.map { $0.characters.count }
userNameCharSignal.combineLatestWith(passwordCharSignal)
.map
{
charArray in charArray.0 > 0 && charArray.1 > 0
}
.observe { event in
if let buttonEnabled = event.value {
self.btnLogin.enabled = buttonEnabled
}
}
viewModel.username <~ usernameSignal
viewModel.password <~ passwordSignal
viewModel.serviceUrl <~ serviceUrlSignal
btnLogin.rac_signalForControlEvents(.TouchUpInside)
.subscribeNext{
button in
print("Authenticate Click!")
}
}
From what I understand, rac_textSignal does not exist in ReactiveSwift. Do I need to install ReactiveObjC or is there a Swift approach that I could use to replace this functionality? Thanks.

Answer 1

You'll need to add ReactiveCocoa in addition to ReactiveSwift.
Since the repo split, the core of what was ReactiveCocoa is now implemented in ReactiveSwift, but ReactiveCocoa adds Cocoa specific things like UIKit bindings which you'll need.
UIKit bindings are accessible via the reactive property, e.g. textfield.reactive.continuousTextValues.
Since these bindings are already correctly typed (as opposed to rac_textSignal), you can replace the whole chunk of
let usernameSignal = self.txtFieldUsername.rac_textSignal()
.toSignalAssumingHot()
.assumeNoErrors()
.map { text in text as! String }
...
viewModel.username <~ usernameSignal
with
viewModel.username <~ self.txtFieldUsername.reactive.continuousTextValues