johnhaney

//
//  ContentView.swift
//  CalculatePi
//
//  Created by John Haney on 3/14/24.
//

import SwiftUI
import Combine

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import SwiftUI

struct Item: Identifiable {
    let id = UUID()
    var title: String
    var details: String
}

struct ItemList: Identifiable {
    let id = UUID()

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protocol Transitionable
{
	associatedtype State
	associatedtype Transition
	func nextState(from: State, via: Transition) -> State?
}

extension Transitionable
{
	func canTransition(from: State, via: Transition) -> Bool

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// usage
toolbarItems = [.FlexibleSpace, doneButton, .FlexibleSpace]

extension UIBarButtonItem {
    static var FlexibleSpace: UIBarButtonItem {
        return SystemItem(.FlexibleSpace)
    }

    static var FixedSpace: UIBarButtonItem {
        return SystemItem(.FixedSpace)

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extension Array where Element: Equatable {
    var uniqueValues: Array<Element> {
        get {
            var collection = Array<Element>()
        
            for element: Element in self
            {
                if !collection.contains(element)
                {
                    collection.append(element)

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override func numberOfSectionsInTableView(tableView: UITableView) -> Int
{
	return fetchedResultsController.sections?.count ?? 0
}

override func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int
{
	return fetchedResultsController.sections?[section].numberOfObjects ?? 0
}

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typedef void (^JHBlockObservedAction)(NSDictionary *change);

@interface JHBlockObserver : NSObject

@property (copy, nonatomic) JHBlockObservedAction block;
@property (strong, nonatomic) id object;
@property (strong, nonatomic) NSString *keyPath;

+ (JHBlockObserver *)observerForObject:(NSObject *)object forKeyPath:(NSString *)keyPath options:(NSKeyValueObservingOptions)options withBlock:(JHBlockObservedAction)block;