RxSwift：基於文本框的啓用/禁用按鈕是不是空

Question

我必須啓用基於字符的按鈕上使用RxSwift

@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 
} 

最後我acomplish做這兩文本框算，但我不知道它的最好辦法：

_ = 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 
    } 

編輯最終版本：

_ = 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

如果我理解你correctl Y，你可能想是這樣的

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) 

有關詳細信息，我建議你看看RxExamples

在那裏，你可以找到很多答案中常見的問題。 玩得開心=）