chengjingfeng / rxkeyboard

Reactive Keyboard in iOS

RxKeyboard

RxKeyboard provides a reactive way of observing keyboard frame changes. Forget about keyboard notifications. It also perfectly works with UIScrollViewKeyboardDismissMode.interactive.

Getting Started

RxKeyboard provides two Drivers.

/// An observable keyboard frame.
let frame: Driver<CGRect>

/// An observable visible height of keyboard. Emits keyboard height if the keyboard is visible
/// or `0` if the keyboard is not visible.
let visibleHeight: Driver<CGFloat>

/// Same with `visibleHeight` but only emits values when keyboard is about to show. This is
/// useful when adjusting scroll view content offset.
let willShowVisibleHeight: Driver<CGFloat>

Use RxKeyboard.instance to get singleton instance.

RxKeyboard.instance

Subscribe RxKeyboard.instance.frame to observe keyboard frame changes.

RxKeyboard.instance.frame
  .drive(onNext: { frame in
    print(frame)
  })
  .disposed(by: disposeBag)

Tips and Tricks

• 🔗 I want to adjust UIScrollView's contentInset to fit keyboard height.

  RxKeyboard.instance.visibleHeight
    .drive(onNext: { [scrollView] keyboardVisibleHeight in
      scrollView.contentInset.bottom = keyboardVisibleHeight
    })
    .disposed(by: disposeBag)

• 🔗 I want to adjust UIScrollView's contentOffset to fit keyboard height.

  RxKeyboard.instance.willShowVisibleHeight
    .drive(onNext: { [scrollView] keyboardVisibleHeight in
      scrollView.contentOffset.y += keyboardVisibleHeight
    })
    .disposed(by: disposeBag)

• 🔗 I want to make UIToolbar move along with the keyboard in an interactive dismiss mode. (Just like the wonderful GIF above!)

  If you're not using Auto Layout:

  RxKeyboard.instance.visibleHeight
    .drive(onNext: { [toolbar, view] keyboardVisibleHeight in
      toolbar.frame.origin.y = view.frame.height - toolbar.frame.height - keyboardVisibleHeight
    })
    .disposed(by: disposeBag)

  If you're using Auto Layout, you have to capture the toolbar's bottom constraint and set constant to keyboard visible height.

  RxKeyboard.instance.visibleHeight
    .drive(onNext: { [toolbarBottomConstraint] keyboardVisibleHeight in
      toolbarBottomConstraint.constant = -1 * keyboardVisibleHeight
    })
    .disposed(by: disposeBag)

  Note: In real world, you should use setNeedsLayout() and layoutIfNeeded() with animation block. See the example project for example.

• Anything else? Please open an issue or make a Pull Request.

Dependencies

• RxSwift (>= 4.4.0)
• RxCocoa (>= 4.4.0)

Requirements

• Swift 4
• iOS 8+

Contributing

In development, RxKeyboard manages dependencies with Swift Package Manager. Use the command below in order to generate a Xcode project file. Note that .xcodeproj file changes are not tracked via git.

$ swift package generate-xcodeproj

Installation

• Using CocoaPods:

  pod 'RxKeyboard'

• Using Carthage:

  binary "https://raw.githubusercontent.com/RxSwiftCommunity/RxKeyboard/master/RxKeyboard.json"
  

  ⚠️ With Carthage, RxKeyboard only supports binary installation:

  • 0.9.2
    • Xcode 10.1 (10B61)
    • Swift 4.2.1 (swiftlang-1000.11.42 clang-1000.11.45.1)
  • 0.9.0
    • Xcode 10 (10A255)
    • Swift 4.2 (swiftlang-1000.11.37.1 clang-1000.11.45.1)
  • 0.8.2
    • Xcode 9.3 (9E145)
    • Swift 4.1.0 (swiftlang-902.0.48 clang-902.0.37.1)
  • 0.7.1
    • Xcode 9.1 (9B55)
    • Swift 4.0.2 (swiftlang-900.0.69.2 clang-900.0.38)
  • 0.7.0
    • 9.0.1 (9A1004)
    • Swift 4.0 (swiftlang-900.0.65.2 clang-900.0.37)

License

RxKeyboard is under MIT license.