快速组合 : how to create custom sink?

Question

我将 RxSwift 与以下类似的东西一起使用

extension Reactive where Base: UIViewController {

    public var showError: Binder<Error> {
        return Binder(self.base) { element, error in
            let alertVC = // create UIAlertController with error
            element.present(alertVC, animated: true)
        }
    }

用 Swift Combine 构建这样的东西的最佳方法是什么？

Answer 1

它是内置的。你不需要制作一个可绑定(bind)的...只需做:

cancelable = publisher.assign(to: \.title, on: barButtonItem)

在回答您编辑的问题时:

extension UIViewController {
    var showError: Subscribers.Sink<Error, Never> {
        return Subscribers.Sink<Error, Never>(
            receiveCompletion: { _ in },
            receiveValue: { [unowned self] error in
                let alertVC = UIAlertController(title: "Error", message: error.localizedDescription, preferredStyle: .alert)
                self.present(alertVC, animated: true)
            }
        )
    }
}