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Extensions from new project template (#133)
* ✨ Add frontmostController extensions * ✨ Add UIView+Spacer * ✨ Add Combine+Concurrency
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,61 @@ | ||
| import UIKit | ||
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| // not sure this doesn't crash on iOS 11, so make it unavailable as it cannot be really tested | ||
| @available(iOS 12, *) | ||
| public extension UIView { | ||
| private final class Spacer: UIView { | ||
| fileprivate var observation: NSKeyValueObservation? | ||
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| init( | ||
| size: CGFloat, | ||
| axis: NSLayoutConstraint.Axis, | ||
| priority: Float | ||
| ) { | ||
| super.init(frame: .init( | ||
| origin: .zero, | ||
| size: .init( | ||
| width: axis == .horizontal ? size : 0, | ||
| height: axis == .vertical ? size : 0 | ||
| ) | ||
| )) | ||
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| translatesAutoresizingMaskIntoConstraints = false | ||
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| switch axis { | ||
| case .horizontal: | ||
| let constraint = widthAnchor.constraint(equalToConstant: size) | ||
| constraint.priority = .init(priority) | ||
| constraint.isActive = true | ||
| case .vertical: | ||
| let constraint = heightAnchor.constraint(equalToConstant: size) | ||
| constraint.priority = .init(priority) | ||
| constraint.isActive = true | ||
| default: assertionFailure("Unknown axis \(axis)") | ||
| } | ||
| } | ||
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| required init?(coder: NSCoder) { | ||
| fatalError("init(coder:) has not been implemented") | ||
| } | ||
| } | ||
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| private func createSpacer(_ size: CGFloat, axis: NSLayoutConstraint.Axis, priority: Float) -> UIView { | ||
| let spacer = Spacer(size: size, axis: axis, priority: priority) | ||
| spacer.isHidden = isHidden | ||
| spacer.observation = observe(\.isHidden) { [weak spacer] sender, _ in | ||
| spacer?.isHidden = sender.isHidden | ||
| } | ||
| return spacer | ||
| } | ||
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| /// Create vertical spacer whose `isHidden` is tied to `self.isHidden` | ||
| func createVSpacer(_ height: CGFloat, priority: Float = 999) -> UIView { | ||
| createSpacer(height, axis: .vertical, priority: priority) | ||
| } | ||
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| /// Create horizontal spacer whose `isHidden` is tied to `self.isHidden` | ||
| func createHSpacer(_ width: CGFloat, priority: Float = 999) -> UIView { | ||
| createSpacer(width, axis: .horizontal, priority: priority) | ||
| } | ||
| } | ||
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,27 @@ | ||
| import UIKit | ||
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| /// Extend you container controllers with this protocol, to make sure `frontmostChild` and `frontmostController` properties | ||
| /// can work correctly | ||
| public protocol FrontmostContainerViewController { | ||
| /// Goes through view controller hierarchy and returns view controller on top | ||
| var frontmostChild: UIViewController? { get } | ||
| } | ||
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| extension UISplitViewController: FrontmostContainerViewController { | ||
| public var frontmostChild: UIViewController? { viewControllers.last } | ||
| } | ||
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| extension UINavigationController: FrontmostContainerViewController { | ||
| public var frontmostChild: UIViewController? { topViewController } | ||
| } | ||
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| extension UITabBarController: FrontmostContainerViewController { | ||
| public var frontmostChild: UIViewController? { selectedViewController } | ||
| } | ||
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| public extension UIViewController { | ||
| /// Returns frontmost controller that can be used e.g. for modal presentations | ||
| var frontmostController: UIViewController { | ||
| presentedViewController?.frontmostController ?? (self as? FrontmostContainerViewController)?.frontmostChild?.frontmostController ?? self | ||
| } | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,24 @@ | ||
| import Combine | ||
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| @available(macOS 10.15, iOS 13.0, *) | ||
| public extension Future where Failure == Error { | ||
| convenience init(operation: @escaping () async throws -> Output) { | ||
| self.init { promise in | ||
| Task { | ||
| do { | ||
| try await promise(.success(operation())) | ||
| } catch { | ||
| promise(.failure(error)) | ||
| } | ||
| } | ||
| } | ||
| } | ||
| } | ||
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| @available(macOS 10.15, iOS 13.0, *) | ||
| public extension AnyPublisher where Failure == Error { | ||
| init(operation: @escaping () async throws -> Output) { | ||
| self = Future { try await operation() }.eraseToAnyPublisher() | ||
| } | ||
| } | ||
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