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RxSwift Observable on iOS keyboard height
import RxSwift // Version 3.2.0
import RxCocoa // Version 3.2.0
func keyboardHeight() -> Observable<CGFloat> {
return Observable
.from([
NotificationCenter.default.rx.notification(NSNotification.Name.UIKeyboardWillShow)
.map { notification -> CGFloat in
(notification.userInfo?[UIKeyboardFrameBeginUserInfoKey] as? NSValue)?.cgRectValue.height ?? 0
},
NotificationCenter.default.rx.notification(NSNotification.Name.UIKeyboardWillHide)
.map { _ -> CGFloat in
0
}
])
.merge()
}
import RxSwift // Version 3.2.0
import RxCocoa // Version 3.2.0
import UIKit
class MyView: UIView {
fileprivate disposeBag = DisposeBag()
init() {
super.init(frame: CGRect.zero)
keyboardHeight()
.observeOn(MainScheduler.instance)
.subscribe(onNext: { (keyboardHeight): CGFloat in
// adjust other views with keyboardHeight
})
.addDisposableTo(disposeBag)
}
required init?(coder aDecoder: NSCoder) { fatalError("init(coder:) has not been implemented") }
}
@EliaECoyote
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EliaECoyote commented Jan 31, 2018

This worked well for me, but I had to replace UIKeyboardFrameBeginUserInfoKey with UIKeyboardFrameEndUserInfoKey to get the correct height value.

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