Observing UITextField.editing with RxSwift

问题

I want to observe the property UITextfield.editing. I'm using this code:

self.money.rx_observe(Bool.self, "editing").subscribeNext { (value) in
    print("")
}.addDisposableTo(disposeBag)

But in the process of running, it's only performed once. How do I solve this，please

回答1:

Don't observe the editing property, because it's not just a stored property. It's defined as:

public var editing: Bool { get }

So you don't know how UIKit is actually getting that value.

Instead, use rx.controlEvent and specify the control events you're interested in, like so:

textField.rx.controlEvent([.editingDidBegin, .editingDidEnd])
    .asObservable()
    .subscribe(onNext: { _ in
        print("editing state changed")
    })
    .disposed(by: disposeBag)

回答2:

For RXSwift 3.0

textField.rx.controlEvent([.editingDidBegin,.editingDidEnd])
        .asObservable()
        .subscribe(onNext: {
            print("editing state changed")
        }).disposed(by: disposeBag)

回答3:

Since RxSwift 4.0, there is two specific control events : textDidBeginEditing and textDidEndEditing

You can used it like this :

textField.rx.textDidEndEditing
            .asObservable()
            .subscribe(onNext: {
                print("End of edition")
            }).disposed(by: disposeBag)


textField.rx.textDidBeginEditing
                .asObservable()
                .subscribe(onNext: {
                    print("Start of edition")
                }).disposed(by: disposeBag)

来源：https://stackoverflow.com/questions/39627440/observing-uitextfield-editing-with-rxswift