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Presentation.swift
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Presentation.swift
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#if canImport(UIKit)
@_spi(Internals) import SwiftNavigation
import UIKit
import UIKitNavigationShim
extension UIViewController {
/// Presents a view controller modally when a binding to a Boolean value you provide is true.
///
/// Like SwiftUI's `sheet`, `fullScreenCover`, and `popover` view modifiers, but for UIKit.
///
/// - Parameters:
/// - isPresented: A binding to a Boolean value that determines whether to present the view
/// controller.
/// - onDismiss: The closure to execute when dismissing the view controller.
/// - content: A closure that returns the view controller to display over the current view
/// controller's content.
@discardableResult
public func present(
isPresented: UIBinding<Bool>,
onDismiss: (() -> Void)? = nil,
content: @escaping () -> UIViewController
) -> ObservationToken {
present(item: isPresented.toOptionalUnit, onDismiss: onDismiss) { _ in content() }
}
/// Presents a view controller modally using the given item as a data source for its content.
///
/// Like SwiftUI's `sheet`, `fullScreenCover`, and `popover` view modifiers, but for UIKit.
///
/// - Parameters:
/// - item: A binding to an optional source of truth for the view controller. When `item` is
/// non-`nil`, the item's content is passed to the `content` closure. You display this
/// content in a view controller that you create that is displayed to the user. If `item`'s
/// identity changes, the view controller is dismissed and replaced with a new one using the
/// same process.
/// - onDismiss: The closure to execute when dismissing the view controller.
/// - content: A closure that returns the view controller to display over the current view
/// controller's content.
@discardableResult
public func present<Item: Identifiable>(
item: UIBinding<Item?>,
onDismiss: (() -> Void)? = nil,
content: @escaping (Item) -> UIViewController
) -> ObservationToken {
present(item: item, id: \.id, onDismiss: onDismiss, content: content)
}
/// Presents a view controller modally using the given item as a data source for its content.
///
/// Like SwiftUI's `sheet`, `fullScreenCover`, and `popover` view modifiers, but for UIKit.
///
/// - Parameters:
/// - item: A binding to an optional source of truth for the view controller. When `item` is
/// non-`nil`, the item's content is passed to the `content` closure. You display this
/// content in a view controller that you create that is displayed to the user. If `item`'s
/// identity changes, the view controller is dismissed and replaced with a new one using the
/// same process.
/// - onDismiss: The closure to execute when dismissing the view controller.
/// - content: A closure that returns the view controller to display over the current view
/// controller's content.
@_disfavoredOverload
@discardableResult
public func present<Item: Identifiable>(
item: UIBinding<Item?>,
onDismiss: (() -> Void)? = nil,
content: @escaping (UIBinding<Item>) -> UIViewController
) -> ObservationToken {
present(item: item, id: \.id, onDismiss: onDismiss, content: content)
}
/// Presents a view controller modally using the given item as a data source for its content.
///
/// Like SwiftUI's `sheet`, `fullScreenCover`, and `popover` view modifiers, but for UIKit.
///
/// - Parameters:
/// - item: A binding to an optional source of truth for the view controller. When `item` is
/// non-`nil`, the item's content is passed to the `content` closure. You display this
/// content in a view controller that you create that is displayed to the user. If `item`'s
/// identity changes, the view controller is dismissed and replaced with a new one using the
/// same process.
/// - id: The key path to the provided item's identifier.
/// - onDismiss: The closure to execute when dismissing the view controller.
/// - content: A closure that returns the view controller to display over the current view
/// controller's content.
@discardableResult
public func present<Item, ID: Hashable>(
item: UIBinding<Item?>,
id: KeyPath<Item, ID>,
onDismiss: (() -> Void)? = nil,
content: @escaping (Item) -> UIViewController
) -> ObservationToken {
present(item: item, id: id, onDismiss: onDismiss) {
content($0.wrappedValue)
}
}
/// Presents a view controller modally using the given item as a data source for its content.
///
/// Like SwiftUI's `sheet`, `fullScreenCover`, and `popover` view modifiers, but for UIKit.
///
/// - Parameters:
/// - item: A binding to an optional source of truth for the view controller. When `item` is
/// non-`nil`, the item's content is passed to the `content` closure. You display this
/// content in a view controller that you create that is displayed to the user. If `item`'s
/// identity changes, the view controller is dismissed and replaced with a new one using the
/// same process.
/// - id: The key path to the provided item's identifier.
/// - onDismiss: The closure to execute when dismissing the view controller.
/// - content: A closure that returns the view controller to display over the current view
/// controller's content.
@_disfavoredOverload
@discardableResult
public func present<Item, ID: Hashable>(
item: UIBinding<Item?>,
id: KeyPath<Item, ID>,
onDismiss: (() -> Void)? = nil,
content: @escaping (UIBinding<Item>) -> UIViewController
) -> ObservationToken {
destination(item: item, id: id) { $item in
content($item)
} present: { [weak self] oldController, newController, transaction in
if let oldController {
oldController.dismiss(animated: !transaction.uiKit.disablesAnimations) {
onDismiss?()
self?.present(newController, animated: !transaction.uiKit.disablesAnimations)
}
} else {
self?.present(newController, animated: !transaction.uiKit.disablesAnimations)
}
} dismiss: { controller, transaction in
controller.dismiss(animated: !transaction.uiKit.disablesAnimations) {
onDismiss?()
}
}
}
/// Presents a view controller when a binding to a Boolean value you provide is true.
///
/// This helper powers ``present(isPresented:onDismiss:content:)`` and
/// ``UIKit/UINavigationController/pushViewController(isPresented:content:)`` and can be used to
/// define custom transitions.
///
/// - Parameters:
/// - isPresented: A binding to a Boolean value that determines whether to present the view
/// controller.
/// - content: A closure that returns the view controller to display.
/// - present: The closure to execute when presenting the view controller.
/// - dismiss: The closure to execute when dismissing the view controller.
@discardableResult
public func destination(
isPresented: UIBinding<Bool>,
content: @escaping () -> UIViewController,
present: @escaping (UIViewController, UITransaction) -> Void,
dismiss: @escaping (UIViewController, UITransaction) -> Void
) -> ObservationToken {
destination(
item: isPresented.toOptionalUnit,
content: { _ in content() },
present: present,
dismiss: dismiss
)
}
/// Presents a view controller using the given item as a data source for its content.
///
/// This helper powers ``UIKit/UINavigationController/pushViewController(item:content:)-4u68r)``
/// and can be used to define custom transitions.
///
/// - Parameters:
/// - item: A binding to an optional source of truth for the view controller. When `item` is
/// non-`nil`, the item's content is passed to the `content` closure. You display this
/// content in a view controller that you create that is displayed to the user.
/// - content: A closure that returns the view controller to display.
/// - present: The closure to execute when presenting the view controller.
/// - dismiss: The closure to execute when dismissing the view controller.
@discardableResult
public func destination<Item>(
item: UIBinding<Item?>,
content: @escaping (UIBinding<Item>) -> UIViewController,
present: @escaping (UIViewController, UITransaction) -> Void,
dismiss: @escaping (UIViewController, UITransaction) -> Void
) -> ObservationToken {
destination(
item: item,
id: { _ in nil },
content: content,
present: { present($1, $2) },
dismiss: dismiss
)
}
/// Presents a view controller using the given item as a data source for its content.
///
/// This helper powers ``present(item:onDismiss:content:)-1zfb1`` and can be used to define
/// custom transitions.
///
/// - Parameters:
/// - item: A binding to an optional source of truth for the view controller. When `item` is
/// non-`nil`, the item's content is passed to the `content` closure. You display this
/// content in a view controller that you create that is displayed to the user. If `item`'s
/// identity changes, the view controller is dismissed and replaced with a new one using the
/// same process.
/// - id: The key path to the provided item's identifier.
/// - content: A closure that returns the view controller to display.
/// - present: The closure to execute when presenting the view controller.
/// - dismiss: The closure to execute when dismissing the view controller.
@discardableResult
public func destination<Item, ID: Hashable>(
item: UIBinding<Item?>,
id: KeyPath<Item, ID>,
content: @escaping (UIBinding<Item>) -> UIViewController,
present: @escaping (
_ oldValue: UIViewController?, _ newValue: UIViewController, _ transaction: UITransaction
) -> Void,
dismiss: @escaping (UIViewController, UITransaction) -> Void
) -> ObservationToken {
destination(
item: item,
id: { $0[keyPath: id] },
content: content,
present: present,
dismiss: dismiss
)
}
private func destination<Item>(
item: UIBinding<Item?>,
id: @escaping (Item) -> AnyHashable?,
content: @escaping (UIBinding<Item>) -> UIViewController,
present: @escaping (
_ oldValue: UIViewController?, _ newValue: UIViewController, _ transaction: UITransaction
) -> Void,
dismiss: @escaping (UIViewController, UITransaction) -> Void
) -> ObservationToken {
let key = UIBindingIdentifier(item)
return observe { [weak self] transaction in
guard let self else { return }
if let unwrappedItem = UIBinding(item) {
var oldController: UIViewController?
if let presented = presented[key] {
if let presentationID = presented.presentationID,
presentationID != id(unwrappedItem.wrappedValue)
{
oldController = presented.controller
} else {
return
}
}
let newController = content(unwrappedItem)
let onDismiss = { [presentationID = id(unwrappedItem.wrappedValue)] in
if
let wrappedValue = item.wrappedValue,
presentationID == id(wrappedValue)
{
item.wrappedValue = nil
}
}
newController.onDismiss = onDismiss
if #available(iOS 17, macOS 14, tvOS 17, watchOS 10, *) {
newController.traitOverrides.dismiss = UIDismissAction { _ in
onDismiss()
}
}
self.presented[key] = Presented(newController, id: id(unwrappedItem.wrappedValue))
let work = {
withUITransaction(transaction) {
present(oldController, newController, transaction)
}
}
if hasViewAppeared {
work()
} else {
onViewAppear.append(work)
}
} else if let presented = presented[key] {
if let controller = presented.controller {
dismiss(controller, transaction)
}
self.presented[key] = nil
}
}
}
fileprivate var presented: [UIBindingIdentifier: Presented] {
get {
(objc_getAssociatedObject(self, Self.presentedKey)
as? [UIBindingIdentifier: Presented])
?? [:]
}
set {
objc_setAssociatedObject(
self, Self.presentedKey, newValue, .OBJC_ASSOCIATION_RETAIN_NONATOMIC
)
}
}
private static let presentedKey = malloc(1)!
}
private class Presented {
weak var controller: UIViewController?
let presentationID: AnyHashable?
init(_ controller: UIViewController, id presentationID: AnyHashable? = nil) {
self.controller = controller
self.presentationID = presentationID
}
}
#endif
extension UIViewController {
/// Pushes a view controller onto the receiver's stack when a binding to a Boolean value you
/// provide is true.
///
/// Like SwiftUI's `navigationDestination(isPresented:)` view modifier, but for UIKit.
///
/// - Parameters:
/// - isPresented: A binding to a Boolean value that determines whether to push the view
/// controller.
/// - content: A closure that returns the view controller to display onto the receiver's
/// stack.
@discardableResult
public func navigationDestination(
isPresented: UIBinding<Bool>,
content: @escaping () -> UIViewController
) -> ObservationToken {
navigationDestination(item: isPresented.toOptionalUnit) { _ in content() }
}
/// Pushes a view controller onto the receiver's stack using the given item as a data source for
/// its content.
///
/// Like SwiftUI's `navigationDestination(item:)` view modifier, but for UIKit.
///
/// - Parameters:
/// - item: A binding to an optional source of truth for the view controller. When `item` is
/// non-`nil`, the item's content is passed to the `content` closure. You display this
/// content in a view controller that you create that is displayed to the user.
/// - content: A closure that returns the view controller to display onto the receiver's
/// stack.
@discardableResult
public func navigationDestination<Item>(
item: UIBinding<Item?>,
content: @escaping (Item) -> UIViewController
) -> ObservationToken {
navigationDestination(item: item) {
content($0.wrappedValue)
}
}
/// Pushes a view controller onto the receiver's stack using the given item as a data source for
/// its content.
///
/// Like SwiftUI's `navigationDestination(item:)` view modifier, but for UIKit.
///
/// - Parameters:
/// - item: A binding to an optional source of truth for the view controller. When `item` is
/// non-`nil`, the item's content is passed to the `content` closure. You display this
/// content in a view controller that you create that is displayed to the user.
/// - content: A closure that returns the view controller to display onto the receiver's
/// stack.
@_disfavoredOverload
@discardableResult
public func navigationDestination<Item>(
item: UIBinding<Item?>,
content: @escaping (UIBinding<Item>) -> UIViewController
) -> ObservationToken {
destination(item: item) { $item in
content($item)
} present: { [weak self] controller, transaction in
guard let navigationController = self?.navigationController ?? self as? UINavigationController
else {
runtimeWarn(
"""
Can't present navigation item: "navigationController" is "nil".
"""
)
return
}
navigationController.pushViewController(
controller, animated: !transaction.uiKit.disablesAnimations
)
} dismiss: { [weak self] controller, transaction in
guard let navigationController = self?.navigationController ?? self as? UINavigationController
else {
runtimeWarn(
"""
Can't dismiss navigation item: "navigationController" is "nil".
"""
)
return
}
navigationController.popFromViewController(
controller, animated: !transaction.uiKit.disablesAnimations
)
}
}
}