FloatingPanel is a simple and easy-to-use UI component for a new interface introduced in Apple Maps, Shortcuts and Stocks app. The new interface displays the related contents and utilities in parallel as a user wants.
- Features
- Requirements
- Installation
- Getting Started
- Usage
- Notes
- Author
- License
- Simple container view controller
- Fluid animation and gesture handling
- Scroll view tracking
- Common UI elements: Grabber handle, Backdrop and Surface rounding corners
- 1~3 anchor positions(full, half, tip)
- Layout customization for all trait environments(i.e. Landscape orientation support)
- Behavior customization
- Free from common issues of Auto Layout and gesture handling
Examples are here.
- Examples/Maps like Apple Maps.app.
- Examples/Stocks like Apple Stocks.app.
FloatingPanel is written in Swift 4.2. Compatible with iOS 10.0+
FloatingPanel is available through CocoaPods. To install it, simply add the following line to your Podfile:
pod 'FloatingPanel'For Carthage, add the following to your Cartfile:
github "scenee/FloatingPanel"
import UIKit
import FloatingPanel
class ViewController: UIViewController, FloatingPanelControllerDelegate {
var fpc: FloatingPanelController!
override func viewDidLoad() {
super.viewDidLoad()
// Initialize a `FloatingPanelController` object.
fpc = FloatingPanelController()
// Assign self as the delegate of the controller.
fpc.delegate = self // Optional
// Set a content view controller.
let contentVC = ContentViewController()
fpc.set(contentViewController: contentVC)
// Track a scroll view(or the siblings) in the content view controller.
fpc.track(scrollView: contentVC.tableView)
// Add and show the views managed by the `FloatingPanelController` object to self.view.
fpc.addPanel(toParent: self)
}
override func viewWillDisappear(_ animated: Bool) {
super.viewWillDisappear(animated)
// Remove the views managed by the `FloatingPanelController` object from self.view.
fpc.removePanelFromParent()
}
...
}class ViewController: UIViewController, FloatingPanelControllerDelegate {
...
func floatingPanel(_ vc: FloatingPanelController, layoutFor newCollection: UITraitCollection) -> FloatingPanelLayout? {
return MyFloatingPanelLayout()
}
...
}
class MyFloatingPanelLayout: FloatingPanelLayout {
public var initialPosition: FloatingPanelPosition {
return .tip
}
public func insetFor(position: FloatingPanelPosition) -> CGFloat? {
switch position {
case .full: return 16.0 // A top inset from safe area
case .half: return 216.0 // A bottom inset from the safe area
case .tip: return 44.0 // A bottom inset from the safe area
}
}
}class ViewController: UIViewController, FloatingPanelControllerDelegate {
...
func floatingPanel(_ vc: FloatingPanelController, layoutFor newCollection: UITraitCollection) -> FloatingPanelLayout? {
return (newCollection.verticalSizeClass == .compact) ? FloatingPanelLandscapeLayout() : nil // Returning nil indicates to use the default layout
}
...
}
class FloatingPanelLandscapeLayout: FloatingPanelLayout {
public var initialPosition: FloatingPanelPosition {
return .tip
}
public var supportedPositions: Set<FloatingPanelPosition> {
return [.full, .tip]
}
public func insetFor(position: FloatingPanelPosition) -> CGFloat? {
switch position {
case .full: return 16.0
case .tip: return 69.0
default: return nil
}
}
public func prepareLayout(surfaceView: UIView, in view: UIView) -> [NSLayoutConstraint] {
return [
surfaceView.leftAnchor.constraint(equalTo: view.safeAreaLayoutGuid.leftAnchor, constant: 8.0),
surfaceView.widthAnchor.constraint(equalToConstant: 291),
]
}
}class ViewController: UIViewController, FloatingPanelControllerDelegate {
...
func floatingPanel(_ vc: FloatingPanelController, behaviorFor newCollection: UITraitCollection) -> FloatingPanelBehavior? {
return FloatingPanelStocksBehavior()
}
...
}
...
class FloatingPanelStocksBehavior: FloatingPanelBehavior {
var velocityThreshold: CGFloat {
return 15.0
}
func interactionAnimator(_ fpc: FloatingPanelController, to targetPosition: FloatingPanelPosition, with velocity: CGVector) -> UIViewPropertyAnimator {
let damping = self.damping(with: velocity)
let springTiming = UISpringTimingParameters(dampingRatio: damping, initialVelocity: velocity)
return UIViewPropertyAnimator(duration: 0.5, timingParameters: springTiming)
}
...
}class ViewController: UIViewController, FloatingPanelControllerDelegate {
var searchPanelVC: FloatingPanelController!
var detailPanelVC: FloatingPanelController!
override func viewDidLoad() {
// Setup Search panel
self.searchPanelVC = FloatingPanelController()
let searchVC = SearchViewController()
self.searchPanelVC.set(contentViewController: searchVC)
self.searchPanelVC.track(scrollView: contentVC.tableView)
self.searchPanelVC.addPanel(toParent: self)
// Setup Detail panel
self.detailPanelVC = FloatingPanelController()
let contentVC = ContentViewController()
self.detailPanelVC.set(contentViewController: contentVC)
self.detailPanelVC.track(scrollView: contentVC.scrollView)
self.detailPanelVC.addPanel(toParent: self)
}
...
}In the following example, I move a floating panel to full or half position while opening or closing a search bar like Apple Maps.
func searchBarCancelButtonClicked(_ searchBar: UISearchBar) {
...
fpc.move(to: .half, animated: true)
}
func searchBarTextDidBeginEditing(_ searchBar: UISearchBar) {
...
fpc.move(to: .full, animated: true)
}class ViewController: UIViewController, FloatingPanelControllerDelegate {
...
func floatingPanelWillBeginDragging(_ vc: FloatingPanelController) {
if vc.position == .full {
searchVC.searchBar.showsCancelButton = false
searchVC.searchBar.resignFirstResponder()
}
}
func floatingPanelDidEndDragging(_ vc: FloatingPanelController, withVelocity velocity: CGPoint, targetPosition: FloatingPanelPosition) {
if targetPosition != .full {
searchVC.hideHeader()
}
}
...
}'Show' or 'Show Detail' segues from a content view controller will be managed by a view controller(hereinafter called 'master VC') adding a floating panel. Because a floating panel is just a subview of the master VC.
FloatingPanelController has no way to manage a stack of view controllers like UINavigationController. If so, it would be so complicated and the interface will become UINavigationController. This component should not have the responsibility to manage the stack.
By the way, a content view controller can present a view controller modally with present(_:animated:completion:) or 'Present Modally' segue.
However, sometimes you want to show a destination view controller of 'Show' or 'Show Detail' segue with another floating panel. It's possible to override show(_:sender) of the master VC!
Here is an example.
class ViewController: UIViewController {
var fpc: FloatingPanelController!
var secondFpc: FloatingPanelController!
...
override func show(_ vc: UIViewController, sender: Any?) {
secondFpc = FloatingPanelController()
secondFpc.set(contentViewController: vc)
secondFpc.addPanel(toParent: self)
}
...
}A FloatingPanelController object proxies an action for show(_:sender) to the master VC. That's why the master VC can handle a destination view controller of a 'Show' or 'Show Detail' segue and you can hook show(_:sender) to show a secondally floating panel set the destination view controller to the content.
It's a greate way to decouple between a floating panel and the content VC.
- On iOS 10,
FloatingPanelSurfaceView.cornerRadiusisn't not automatically masked with the top rounded corners because of UIVisualEffectView issue. See https://forums.developer.apple.com/thread/50854. So you need to draw top rounding corners of your content. Here is an example in Examples/Maps.
override func viewDidLayoutSubviews() {
super.viewDidLayoutSubviews()
if #available(iOS 10, *) {
visualEffectView.layer.cornerRadius = 9.0
visualEffectView.clipsToBounds = true
}
}- If you sets clear color to
FloatingPanelSurfaceView.backgroundColor, please note the bottom overflow of your content on bouncing at full position. To prevent it, you need to expand your content. For example, See Example/Maps's Auto Layout settings of UIVisualEffectView in Main.storyborad.
Shin Yamamoto shin@scenee.com
FloatingPanel is available under the MIT license. See the LICENSE file for more info.