RxSwift:基于文本字段的启用/禁用按钮不为空

Question

我必须使用RxSwift根据两个文本字段上的字符数启用一个按钮

@IBOutlet weak var userTextField: UITextField!
@IBOutlet weak var passwordTextField: UITextField!
@IBOutlet weak var buttonToEnableDisable: UIButton!

var enabledObservable = combineLatest(userTextField.rx_text, passwordTextField.rx_text) 
{ (user,password) in
   self.loginButton.enabled = a.characters.count > 0 && b.characters.count > 0
}

最后我通过这样做来完成,但我不确定它是否是最好的方式:

    _ = combineLatest(emailTextField.rx_text, passwordTextField.rx_text) { (a: String, b:String) in
        self.loginButton.enabled = (a.characters.count > 0 && b.characters.count > 0)
    }.subscribeNext { (result) -> Void in
    }

编辑最终版本:

    _ = combineLatest(emailTextField.rx_text, passwordTextField.rx_text) { (a: String, b:String) in
        return (a.characters.count > 0 && b.characters.count > 0)
        }.subscribeNext { enabled in
            self.loginButton.alpha = enabled ? 1 : 0.5
            self.loginButton.enabled = enabled
        }
        .addDisposableTo(disposeBag)

Answer 1

如果我理解正确,你可能想要这样的东西

  let loginValidation = loginTextFiled
     .rx_text
     .map({!$0.isEmpty})
     .shareReplay(1)

  let userNameValidation = passwordTextField
     .rx_text
     .map({!$0.isEmpty})
     .shareReplay(1)

  let enableButton = combineLatest(loginValidation, userNameValidation) { (login, name) in
     return login && name
  }

  enableButton
     .bindTo(loginButton.rx_enabled)
     .addDisposableTo(disposeBag)

有关详细信息,我建议您查看RxExamples

在那里你可以找到很多常见问题的答案.玩得开心=)