如何將我的 UIButton 標題綁定到我的 ViewModel

Question

我想將UIButton標題綁定到我的 ViewModel 中的BehaviorSubject<String> 。 我在Label中這樣做，如下所示：

//ViewModel
var fullName = BehaviorSubject<String?>(value: "")

//ViewController
vm.fullName.bind(to: fullNameLabel.rx.text).disposed(by: bag)

有什么辦法嗎？

Answer 1

正確的方法是使用title() binder。

vm.fullName
    .bind(to: button.rx.title())
    .disposed(by: disposeBag)

Answer 2

在RxCocoa之后， Reactive還擴展了 UIButton title或attributedTitle標題來綁定它

請檢查此 [RxSwift/UIButton+Rx.swift] 鏈接（ https://github.com/ReactiveX/RxSwift/blob/master/RxCocoa/iOS/UIButton%2BRx.swift ）

extension Reactive where Base: UIButton {

    /// Reactive wrapper for `setTitle(_:for:)`
    public func title(for controlState: UIControl.State = []) -> Binder<String?> {
        return Binder(self.base) { button, title -> Void in
            button.setTitle(title, for: controlState)
        }
    }
}

extension Reactive where Base: UIButton {

    /// Reactive wrapper for `setAttributedTitle(_:controlState:)`
    public func attributedTitle(for controlState: UIControl.State = []) -> Binder<NSAttributedString?> {
        return Binder(self.base) { button, attributedTitle -> Void in
            button.setAttributedTitle(attributedTitle, for: controlState)
        }
    }

}

因此，您可以將您的全名 BehaviorSubject 綁定到按鈕，例如您的示例代碼 label

vm.fullName.bind(to: someButton.rx.title()).disposed(by: bag)

Answer 3

使用 rx swift 的正確方法：

vm.buttonTitle.bind(to: button.rx.title(for: .normal)).disposed(by: bag)