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mitsuse/MakeTitleViewFirstResponderByTouchingTabTwice.swift

Created March 2, 2018 03:30
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  1. mitsuse created this gist Mar 2, 2018.
    28 changes: 28 additions & 0 deletions MakeTitleViewFirstResponderByTouchingTabTwice.swift
    View file
    Original file line number Diff line number Diff line change
    @@ -0,0 +1,28 @@
    import UIKit

    import RxCocoa
    import RxSwift

    final class TabBarController: UITabBarController {
    private let disposeBag = DisposeBag()

    override func viewDidLoad() {
    super.viewDidLoad()

    rx.didSelect
    .withPrevious()
    .subscribe(onNext: { previous, next in
    guard previous == next, let topViewController = (next as? UINavigationController)?.topViewController else { return }
    topViewController.navigationItem.titleView?.becomeFirstResponder()
    })
    .disposed(by: disposeBag)
    }
    }

    extension ObservableType {
    public func withPrevious() -> Observable<(E?, E?)> {
    return self
    .scan((nil, nil)) { state, next in let (_, previous) = state; return (previous, next) }
    .skip(1)
    }
    }