### PanModal is an elegant and highly customizable presentation API for constructing bottom sheet modals on iOS.

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Platform: iOS 10.0+ Language: Swift 5 CocoaPods compatible Carthage compatible License: MIT

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Read our blog on how Slack is getting more :thumbsup: with PanModal Swift 4.2 support can be found on the `Swift4.2` branch.

## Features * Supports any type of `UIViewController` * Seamless transition between modal and content * Maintains 60 fps performance ## Compatibility PanModal requires **iOS 10+** and is compatible with **Swift 4.2** projects. ## Installation * CocoaPods: ```ruby pod 'PanModal' ``` * Carthage: ```ruby github "slackhq/PanModal" ``` ## Usage PanModal was designed to be used effortlessly. Simply call `presentPanModal` in the same way you would expect to present a `UIViewController` ```swift .presentPanModal(yourViewController) ``` The presented view controller must conform to `PanModalPresentable` to take advantage of the customizable options ```swift extension YourViewController: PanModalPresentable { var panScrollable: UIScrollView? { return nil } } ``` ### PanScrollable If the presented view controller has an embedded `UIScrollView` e.g. as is the case with `UITableViewController`, panModal will seamlessly transition pan gestures between the modal and the scroll view ```swift class TableViewController: UITableViewController, PanModalPresentable { var panScrollable: UIScrollView? { return tableView } } ``` ### Adjusting Heights Height values of the panModal can be adjusted by overriding `shortFormHeight` or `longFormHeight` ```swift var shortFormHeight: PanModalHeight { return .contentHeight(300) } var longFormHeight: PanModalHeight { return .maxHeightWithTopInset(40) } ``` ### Updates at Runtime Values are stored during presentation, so when adjusting at runtime you should call `panModalSetNeedsLayoutUpdate()` ```swift func viewDidLoad() { hasLoaded = true panModalSetNeedsLayoutUpdate() panModalTransition(to: .shortForm) } var shortFormHeight: PanModalHeight { if hasLoaded { return .contentHeight(200) } return .maxHeight } ``` ### Sample App Check out the [Sample App](https://github.com/slackhq/PanModal/tree/master/Sample) for more complex configurations of `PanModalPresentable`, including navigation controllers and stacked modals. ## Documentation Option + click on any of PanModal's methods or notes for detailed documentation.

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## Contributing We're glad to be open sourcing this library. We use it in numerous places within the slack app and expect it to be easy to use as well as modify; we've added extensive documentation within the code to support that. We will only be fixing critical bugs, thus, for any non-critical issues or feature requests we hope to be able to rely on the community using the library to add what they need. For more information, please read the [contributing guidelines](https://github.com/slackhq/PanModal/blob/master/CONTRIBUTING.md). ## Authors [Stephen Sowole](https://github.com/tun57) • [Tosin Afolabi](https://github.com/tosinaf) ## License PanModal is released under a MIT License. See LICENSE file for details.