douglashill

@import Foundation;
@import ImageIO;

BOOL exportAtVariousCompressionQualities(NSURL *sourceLocation, NSURL *exportLocation, NSError **error)
{
	if (![[NSFileManager defaultManager] createDirectoryAtURL:exportLocation withIntermediateDirectories:YES attributes:nil error:error]) {
		return NO;
	}
	
	CGImageSourceRef source = CGImageSourceCreateWithURL((__bridge CFURLRef)(sourceLocation), NULL);

douglashill

// Douglas Hill, October 2018

import UIKit

/**
 A scroll view that honours the reduce motion accessibility setting.

 If reduce motion is enabled, animated adjustments to contentOffset
 will use a cross dissolve instead of translation.

douglashill

@implementation PSPDFTableViewCell // UITableViewCell subclass

/**
 On iOS 10, constraints involving a UITableViewCell’s contentView’s layoutMarginsGuide are removed for some
 reason before the cell appears, which breaks the layout. This layout guide is a working alternative.
 */
- (UILayoutGuide *)pspdf_layoutMarginsGuide {
    if (@available(iOS 11.0, *)) {
        return self.contentView.layoutMarginsGuide;
    }

douglashill

// Douglas Hill, April 2017
// From https://douglashill.co/reading-app/

#if os(macOS)
import AppKit

public typealias Colour = NSColor
public typealias Font = NSFont
public typealias FontDescriptor = NSFontDescriptor
public typealias Image = NSImage

douglashill

// Douglas Hill, December 2019
// Made for https://douglashill.co/reading-app/

import Foundation

/// Tries really hard to read a string from a file.
///
/// Brute forces encodings if necessary. This will only fail if the file can’t be interpreted
/// in any encoding, or if some other error occurs like not being able to read from the file.
///

douglashill

NSError *error = [NSError errorWithDomain:@"domain" code:123 userInfo:nil];
[(NSFileHandle *)nil seekToOffset:0 error:&error];
assert(error != nil); // 💥 Not OK. The error has gone!

douglashill

// Douglas Hill, November 2019
// Find the latest version of this file at https://github.com/douglashill/KeyboardKit

import UIKit

/// A scroll view that allows scrolling using a hardware keyboard like `NSScrollView`.
/// Supports arrow keys, option + arrow keys, command + arrow keys, space bar, page up, page down, home and end.
/// Limitations:
/// - Paging scroll views (isPagingEnabled = true) are not supported yet.
/// - The scroll view must become its own delegate so setting the delegate is not supported yet.

douglashill

@import ImageIO;

@implementation UIImage (DHImageDecoding)

/// Warning: do not use. This looks like it should work, but it blocks the main thread for non-obvious reasons.
+ (UIImage *)dh_decodedImageWithData:(NSData *)data
{
	CGImageSourceRef source = CGImageSourceCreateWithData((__bridge CFDataRef)data, NULL);
	if (source == NULL) {
		return nil;

douglashill

/// A Swift property wrapper that implements ‘lazy let’. I.e. a read-only property that loads its value when first read.
/// Not safe for access from multiple threads.
/// Does not work the same as the lazy keyboard because the property initialiser will run before self is available.
/// Adapted from https://github.com/apple/swift-evolution/blob/master/proposals/0258-property-wrappers.md
@propertyWrapper enum LazyLet<Value> {
    case uninitialised(() -> Value)
    case initialised(Value)

    init(wrappedValue: @autoclosure @escaping () -> Value) {
        self = .uninitialised(wrappedValue)

douglashill

import UIKit

@UIApplicationMain
class AppDelegate: UIResponder, UIApplicationDelegate {
}

class SceneDelegate: UIResponder, UIWindowSceneDelegate {
    private var _window: UIWindow?

    func scene(_ scene: UIScene, willConnectTo session: UISceneSession, options connectionOptions: UIScene.ConnectionOptions) {