[英]Nesting subscribe calls in RxSwift
I've started learning RxSwift, but can't understand some moments. 我已经开始学习RxSwift,但无法理解一些时刻。 I have to create a button after performing a request. 我必须在执行请求后创建一个按钮。 Like this: 像这样:
textField.rx.text
.flatMapLatest { text in
return performURLRequest(text)
}
.subscribe(onNext: { request in
// Create a button
let button = UIButton()
button.rx.tap
.subscribe({ _ in
// Action
}).disposed(by: self.disposeBag)
self.view.addSubview(button)
})
.disposed(by: disposeBag)
How can I avoid nesting subscribe calls? 如何避免嵌套订阅调用? Because of this code smell. 因为这个代码味道。
You could avoid nested subscription by using flatMap
eg (orEmpty is optional) 您可以使用flatMap
避免嵌套订阅,例如(orEmpty是可选的)
textField.rx.text.orEmpty
.flatMapLatest { text in
return performURLRequest(text)
}
.flatMap { request -> Observable<Void> in
// Create a button
let button = UIButton()
self.view.addSubview(button)
return button.rx.tap.asObservable()
}
.subscribe({ _ in
// Action
}).disposed(by: self.disposeBag)
I can confirm nested subscribes are a no-no. 我可以确认嵌套订阅是禁止的。
You can use the switchMap
operator in a pipe
. 您可以在pipe
使用switchMap
运算符。
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