如何在按钮点击时观察 PublishSubject

Posted 2023-03-10

【中文标题】如何在按钮点击时观察 PublishSubject

【英文标题】：how to observe PublishSubject on button tap

【发布时间】：2017-05-16 14:14:09

【问题描述】：

我正在处理这种情况，我想在这里应用 RxSwift。

我有.xib UIView 和按钮。

class RightButtonItemView: UIView 

    @IBOutlet weak var rightButtonimageView: UIImageView!
    @IBOutlet weak var rightButtonButton: UIButton!

    let performEventSegue = PublishSubject<Bool>()

    class func instanceFromNib() -> RightButtonItemView 
        return UINib(nibName: "NotificationView", bundle: nil).instantiate(withOwner: nil, options: nil)[0] as!  RightButtonItemView
    

    override func awakeFromNib() 
       //I'm not sure how should I link button tap and my subject 
       rightButtonButton.rx.tap
    

我在我的 viewController 中创建了这个视图的一个实例

var rightButtonItemView = RightButtonItemView.instanceFromNib()

从我的 segue 中点击这个按钮我需要转到下一个 VC，所以我订阅了 UIView 的主题

rightButtonItemView.performEventSegue.asObserver().subscribe(onNext:  (isAuthorized) in

        if isAuthorized 
            let storyboard = UIStoryboard(name: "Notifications", bundle: nil)
            let viewController = storyboard.instantiateViewController(withIdentifier: "UserNotificationsViewController")
            self.present(viewController, animated: true, completion: nil)
        
    )

但我不知道如何将按钮点击与更改我的发布主题的状态联系起来？

【参考方案1】：

您在这种情况下使用bind 运算符：

class RightButtonItemView: UIView 

    @IBOutlet weak var rightButtonimageView: UIImageView!
    @IBOutlet weak var rightButtonButton: UIButton!

    let performEventSegue = PublishSubject<Void>()
    private let bag = DisposeBag()

    class func instanceFromNib() -> RightButtonItemView 
        return UINib(nibName: "NotificationView", bundle: nil).instantiate(withOwner: nil, options: nil)[0] as!  RightButtonItemView
    

    override func awakeFromNib() 
        rightButtonButton.rx.tap
            .bind(to: performEventSegue)
            .disposed(by: bag)
    

-- 更新--

我想到了这个解决方案，我认为它更好。您根本不需要主题：

class RightButtonItemView: UIView 

    @IBOutlet weak var rightButtonButton: UIButton!

    var performEventSegue: Observable<Void> 
        return rightButtonButton.rx.tap.asObservable()