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Hacking in Swift

Adrian M. DevAndArtist

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Hacking in Swift
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View interchangeable_matched_geometry_effect.swift
import SwiftUI
struct HeroAnimationTest: View {
let indices = 0 ..< 3
@State
var showsOtherView = false
@Namespace
var namespaceID: Namespace.ID
View swiftui_picker_attempt.swift
import Combine
import SwiftUI
// To re-align the cells to the center we use a workaround through debouncing
// the nearest cell ID which is computed every time the scroll view moves.
//
// HOWEVER there is a bug that still needs to be solved:
// If you drag the scroll view and hold, the debounce event will still happen
// and reposition the cell.
//
View weak_as_type.swift
import PlaygroundSupport
import Dispatch
let page = PlaygroundPage.current
page.needsIndefiniteExecution = true
struct Weak<T> {
struct _ObjectBox {
weak var object: AnyObject?
}
View small_but_shiny.swift
public protocol MapKey {
associatedtype Value
static var defaultValue: Value { get }
}
public struct Map<Base> {
typealias _Key = ObjectIdentifier
var _values: [_Key: Any]
View swiftui_alignment_keys.swift
import SwiftUI
// T.Type -> AlignmentID.Type -> Any.Type -> UInt
extension HorizontalAlignment {
enum TestH: AlignmentID {
static func defaultValue(in context: ViewDimensions) -> CGFloat {
0
}
}
View broken_swiftui_layout.swift
// BUG: FB7635852
import SwiftUI
struct ContentView: View {
let count: Int
var body: some View {
HStack
.init(alignment: .top, spacing: 0) {
View swiftui_update_inconsistency.swift
// SOME OBSERVATIONS:
// * In Xcode 11.3.1 `V_Struct_Representable_ObservedObject` won't update
// which is clearly a bug. This bug is fixed in Xcode 11.4 beta 1.
//
// * `V_Struct` and `V_Struct_Representable` both never update because
// they shouldn't as the framework internal raw-diffing likely won't
// identify any change. (EXPECTED BEHAVIOR)
//
// * `V_Class` and `V_Class_ObservedObject` both produce a runtime crash,
// which might be a bug as well. `View` conforming types shouldn't be
View swiftui_preferenceview.swift
// This code uses 3 HIDDEN SwiftUI types, there is no guarantee
// that it will pass app review, so please use it with caution.
//
// * SwiftUI._PreferenceValue<Key>
// * SwiftUI._DelayedPreferenceView<Key, Content>
// * SwiftUI._PreferenceValue<Key>
//
// Feedback ID for an official support: (FB7577482)
//
// ⚠️ WARNING:
View swiftui_bugged_preferences.swift
struct PKey: PreferenceKey {
static var defaultValue: Int?
static func reduce(value: inout Int?, nextValue: () -> Int?) {
print(#function, "value:", value as Any, "nextValue:", nextValue() as Any)
value = nextValue()
}
}
struct ContentView: View {
let condition = true
View swiftui_non_rendering_view_with_preferences.swift
// BUG: FB7569572
struct GeometrySizeKey: PreferenceKey {
static func reduce(value: inout CGSize?, nextValue: () -> CGSize?) {
value = nextValue()
}
}
extension View {
func readGeometrySize() -> some View {
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