Question

   _ = textField.rx.text.orEmpty.filter({ (text) -> Bool in
       text.count > 12
        return true
    }).subscribe(onNext: { (text) in
        let tempText:String = text
        self.textField.text = (tempText as NSString).substring(to: 12)
    })

它有一些，我需要使用textFieldDidEndEditing

Answer 1

您可以在RxSwift中使用委托代理模式首先，我们需要将委托UITextField设置为DelegateProxyType

 class RxTextFieldDelegateProxy: DelegateProxy<UITextField, UITextFieldDelegate>, DelegateProxyType, UITextFieldDelegate {

   init(textField: UITextField) {
      super.init(parentObject: textField, delegateProxy: RxTextFieldDelegateProxy.self)
   }

   static func registerKnownImplementations() {
      self.register { RxTextFieldDelegateProxy(textField: $0)}
   }

   static func currentDelegate(for object: UITextField) -> UITextFieldDelegate? {
      return object.delegate
   }

   static func setCurrentDelegate(_ delegate: UITextFieldDelegate?, to object: UITextField) {
         object.delegate = delegate
      }
}

其次，我们可以在RxSwift中自己定义属性。

extension Reactive where Base: UITextField {

   public var delegate: DelegateProxy<UITextField, UITextFieldDelegate> {
      return RxTextFieldDelegateProxy.proxy(for: base)
   }

   public var editingDidEnd: Observable<String> {
      return delegate.sentMessage(#selector(UITextFieldDelegate.textFieldDidEndEditing(_:))).map { value in
         guard let textField = value[0] as? UITextField else { return "" }
         return textField.text!   }
   }

}

第三种用法：

myTextField.rx.editingDidEnd.subscribe(onNext: { value in
         debugPrint(value)
      }).disposed(by: bag)

Answer 2

RxSwift 4.0

如果您想使用UITextField委托方法，则使用`controlEvent。

var bag = DisposeBag()

现在将观察者放在viewDidLoad方法中。

override func viewDidLoad() {
        super.viewDidLoad()

        controls.txtTitle.rx
            .controlEvent([.editingDidEnd])
            .asObservable()
            .subscribe(onNext: {
                print("Editing done")
            }).disposed(by: bag)
    }

如何在rxSwift 4.0中使用UITextField.delegate textFieldDidEndEditing

2 个答案: