SplitSheet

A lightweight, fully interactive split-screen sheet.

• Powered by UIScrollView for super-smooth gestures.
• Show/hide either programmatically or with a swipe gesture.
• Gestures are fully interruptible.
• Won't affect buttons and gestures nested in subviews.
• Supports sizing detents (hidden, shown, expanded).
• Fully compatible with Auto Layout self-sizing.
• Super simple, no dependencies, ~300 lines of code.
• Replicates iOS 15's sheet detents while supporting iOS 9+.

Showcase

Installation

Requires iOS 9+. SplitSheet can be installed through the Swift Package Manager (recommended) or manually.

https://github.com/aheze/SplitSheet

Sources/SplitSheet.swift

Usage

import Combine
import SplitSheet
import UIKit

class ViewController: UIViewController {

    /// Works with any view controller.
    let mainViewController = MainViewController()
    let sheetViewController = SheetViewController()
    lazy var splitSheetController = SplitSheetController(
        mainViewController: mainViewController,
        sheetViewController: sheetViewController
    )

    override func viewDidLoad() {
        super.viewDidLoad()

        /// If true, `mainViewController` will shift up as the sheet is shown.
        splitSheetController.displaceContent = true

        /// Show a grabber handle.
        splitSheetController.showHandle = true

        /// The minimum sheet height.
        splitSheetController.minimumSheetHeight = CGFloat(400)

        /// When the sheet is shown and dragged within this limit, the sheet will bounce back.
        splitSheetController.snappingDistance = CGFloat(150)

        /// How long the show/hide animation takes.
        splitSheetController.animationDuration = CGFloat(0.6)

        /// If swiping up to show the sheet is allowed or not.
        splitSheetController.swipeUpToShowAllowed = true

        /// Override the status bar color.
        splitSheetController.statusBarStyle = UIStatusBarStyle.default
        
        /// Add the sheet.
        embed(splitSheetController, inside: view)
    }

    override func viewDidAppear(_ animated: Bool) {
        super.viewDidAppear(animated)

        /// Show the sheet programmatically.
        splitSheetController.show(true)
    }

    /// Propagate `splitSheetController`'s custom status bar to this view controller.
    override var childForStatusBarStyle: UIViewController? {
        return splitSheetController
    }
}

Self-Sizing and Detents

It's simple — if your sheet view controller's intrinsic size is larger than the minimumSheetHeight, a "large" detent will be added.

class SheetViewController: UIViewController {
    override func viewDidLosrc="https://raw.github.com/aheze/SplitSheet/main/{
        super.viewDidLoad()
        
        view.backgroundColor = .systemTeal
        view.heightAnchor.constraint(equalToConstant: 800).isActive = true
    }
}

Apps Using SplitSheet

Find is an app for finding your photos. SplitSheet is used for the photo gallery view and info sheet — download to check it out!

If you have an app that uses SplitSheet, just make a PR or message me.

License

MIT License

Copyright (c) 2022 A. Zheng

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.