dhoerl

// Based on https://gist.github.com/schickling/b5d86cb070130f80bb40#gistcomment-2894406
func image(data: Data, orientation: UIImage.Orientation = .up) -> UIImage? {
    let context: CGContext
    let width: CGFloat
    let height: CGFloat

    func defaultImage() -> UIImage? {
        return UIImage(data: data)
    }

dhoerl

/*
     File: KeychainItemWrapper.h
 Abstract: 
 Objective-C wrapper for accessing a single keychain item.
 
  Version: 1.2 - ARCified
 
 Disclaimer: IMPORTANT:  This Apple software is supplied to you by Apple
 Inc. ("Apple") in consideration of your agreement to the following
 terms, and your use, installation, modification or redistribution of

dhoerl

enum SPErrors: Error {
    case inputStringWasEmpty
}

struct StringPublisher: Publisher {
    typealias Output = [Character]
    typealias Failure = Error

    private let data: [Character]

dhoerl

//
//  Asymmetric.swift
//
//  Created by David Hoerl on 12/23/18.
//  Copyright © 2018 David Hoerl. All rights reserved.
//

/*
  This is the portion you need in the distributed app, which uses the public key that can appear in plain text
*/

dhoerl

When I posted this on Apple’s Cocoadev listserver, I never did get pointers to code to convert a NSDictionary to a binary formatted plist, but did get pointers to look at NSPropertyListSerialization - something I had already (mis)read a few times.

The description for the dataFromPropertyList class method seems confusing if you don't understand that you can create a property list with no keys: that is, you can create one with a single compliant object, and the key becomes "root".

So, in the unlikely event that some else someday has the same mental block, here is actual tested code that takes a NSDictionary and creates a binary plist file:

   NSDictionary *dict;
    char *payload = "This is the payload";
    
    dict = [NSDictionary dictionaryWithObjectsAndKeys:

dhoerl

struct UpperCasePublisher: Publisher {
    typealias Output = [Character]
    typealias Failure = Error

    let upstreamPublisher: AnyPublisher<Output, Error>

    init(upstream: AnyPublisher<Output, Error>) {
        self.upstreamPublisher = upstream
    }

dhoerl

final class StringSubscriber: Subscriber {
    typealias Input = [Character]
    typealias Failure = Error

    var subscription: Subscription?
    var count = 0

    func receive(subscription: Subscription) {
        self.subscription = subscription
        self.subscription?.request(.max(1))

dhoerl

// Inspired by https://gist.github.com/nitrag/b3117a4b6b8e89fdbc12b98029cf98f8

+ (UIImage *)imageFromView:(UIView *)view subsection:(CGRect)subRect
{
    // Image will be sized to the smaller rectangle
    UIGraphicsBeginImageContextWithOptions(subRect.size, YES, 0);

    // The primary view needs to shift up and left so the desired rect is visible
    // But the rect passed below needs to be sized to the view, otherwise the image is compressed
    CGRect drawRect = CGRectMake(-subRect.origin.x, -subRect.origin.x, view.bounds.size.width, view.bounds.size.height);

dhoerl

static NSString *kcIdentifier = @"MyApp";

@implementation LTAppDelegate (KeyChain)

- (void)keychainInit
{
	self.keychainDict = [NSMutableDictionary dictionaryWithCapacity:7];
	KeychainItemWrapper *item = [[KeychainItemWrapper alloc] initWithIdentifier:kcIdentifier accessGroup:nil];
	
	[self.keychainDict setObject:@"" forKey:kcEmailAddress];

dhoerl

- (uint64_t)freeDiskspace
{
	uint64_t totalFreeSpace = 0;

	__autoreleasing NSError *error = nil;  
	NSString *path = [self applicationDocumentsDirectory];  
	NSDictionary *dictionary = [[NSFileManager defaultManager] attributesOfFileSystemForPath:path error: &error];  

	if (dictionary) {  
		NSNumber *freeFileSystemSizeInBytes = [dictionary objectForKey:NSFileSystemFreeSize];