jegnux

import SwiftUI
import Combine

public struct ChangeObserver<V: Equatable>: ViewModifier {
    public init(newValue: V, action: @escaping (V) -> Void) {
        self.newValue = newValue
        self.newAction = action
    }

    private typealias Action = (V) -> Void

fruitcoder

import UIKit

#if targetEnvironment(simulator)
	@_silgen_name("UIAnimationDragCoefficient") func UIAnimationDragCoefficient() -> Float
	func simulatorDragCoefficient() -> CFTimeInterval {
		let drag = UIAnimationDragCoefficient()
		if drag > 1 {
			return CFTimeInterval(drag)
		}
		return 1

chbeer

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
<dict>
    <key>method</key>
    <string>app-store</string>
    <key>teamID</key>
    <string>YOUR_TEAM_ID</string>
    <key>destination</key>
    <string>upload</string>

yoching

import UIKit

struct Style<View: UIView> {
    let apply: (View) -> View
    
    // from swift 5.2
    func callAsFunction(_ view: View) -> View {
        apply(view)
    }
}

myell0w

/// Used to identify traits of the current UI Environment - especially useful for cross-platform code
public struct MNCUITraits: Withable {

    /// Does *not* identify the device type, but the idiom of the layout to apply
    /// This means that e.g. on iPad the layoutIdiom can be `.phone`, if run in Split Screen or SlideOver
    public enum LayoutIdiom {
        case phone(hasRoundCorners: Bool)
        case pad(hasRoundCorners: Bool)
        case mac
    }

swiftui-lab

// Authoer: The SwiftUI Lab
// Full article: https://swiftui-lab.com/scrollview-pull-to-refresh/

import SwiftUI

struct RefreshableScrollView<Content: View>: View {
    @State private var previousScrollOffset: CGFloat = 0
    @State private var scrollOffset: CGFloat = 0
    @State private var frozen: Bool = false
    @State private var rotation: Angle = .degrees(0)

bardonadam

@DynamicColor(lightVariant: .black, darkVariant: .white)
static var dynamicLabelColor: UIColor

@propertyWrapper
struct DynamicColor {
    let lightVariant: UIColor
    let darkVariant: UIColor

    var wrappedValue: UIColor {
        get {

chriseidhof

final class Loader: BindableObject {
    let didChange = PassthroughSubject<Data?, Never>()
    var task: URLSessionDataTask!
    var data: Data? = nil {
        didSet {
            didChange.send(data)
        }
    }
    
    init(_ url: URL) {

tclementdev

libdispatch efficiency tips

The libdispatch is one of the most misused API due to the way it was presented to us when it was introduced and for many years after that, and due to the confusing documentation and API. This page is a compilation of important things to know if you're going to use this library. Many references are available at the end of this document pointing to comments from Apple's very own libdispatch maintainer (Pierre Habouzit).

My take-aways are:

• You should create very few, long-lived, well-defined queues. These queues should be seen as execution contexts in your program (gui, background work, ...) that benefit from executing in parallel. An important thing to note is that if these queues are all active at once, you will get as many threads running. In most apps, you probably do not need to create more than 3 or 4 queues.

• Go serial first, and as you find performance bottle necks, measure why, and if concurrency helps, apply with care, always validating under system pressure. Reuse

Sorix

protocol FRCCollectionViewDelegate: class {
	func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell
}

class FRCCollectionViewDataSource<FetchRequestResult: NSFetchRequestResult>: NSObject, UICollectionViewDataSource, NSFetchedResultsControllerDelegate {
	
	let frc: NSFetchedResultsController<FetchRequestResult>
	weak var collectionView: UICollectionView?
	weak var delegate: FRCCollectionViewDelegate?