I am trying to learn about core data on the iPhone, and I am looking for a simple Core Data example app.
The problem is, all the example apps I've seen are either too simple (just one view and one data object), or so full of extra functions that it's hard to see what's relevant (Apple's example apps).
I'm looking for an example app with:
an ordinary cascading to-many relationship (e.g. Company > Departments > Employees)
a simple drill-down interface (e.g. click on a company to see list of departments; click on a department to see list of employees; click on an employee to see name and address)
simple editing (press plus for modal view to add company/department/employee)
... so I can learn the basics about passing contexts between views, NSFetchedResultsController etc.
Does anyone know of such a thing?
Thanks!
Try the example found here: Wiley Code Examples
Click on Chapter 18 - Downloads.
Hope this helps.
Let It Be Known
I would recommend Marcus Zarra's Core Data book and the examples therein. He takes one example app that starts off very simple and incrementally adds complexity.
RecipeCT is the project that I would suggest looking at first. Having the book would help you navigate from project to project as the basic Recipes app transforms.
Related
I have two Crud Controllers, Project & PurchaseOrders.
When I display a particular project content (say URL /project/2/show), its related purchase orders are displayed in table format in one of the tabs like picture below:
Since there will be a lot of purchase orders within same project, I need the table above to be filterable, like in the method SetupListOperation() in PurchaseOrders Controller like picture below:
Basically, how do I put PurchaseOrders Controller List Operation within a Project content Tab?
Thanks
In short, in Backpack version 4.x / 5.x, you can't. The ListOperation wasn't designed to be used that way, so it will be very difficult to do. It will be faster to just code that feature yourself, with a limited set of features - only the ones you need.
The main reason why it wouldn't be simple is that both the ListOperation and the CreateOperation / UpdateOperation would be using the CRUD singleton, whereas you need to show/manipulate entries in two different entities (projects and purchase orders).
The Backpack team is working on a feature that you could use for this (a "table" widget you can include anywhere, including there), but it will probably take 2-3 more months to launch.
Also, there's a Backpack add-on offering something similar (see https://github.com/izica/relations-widgets-for-backpack ) but it's meant for the Show operation (not Update) and it doesn't include filtering, from what I can tell.
So the best you can do, in my opinion, is to just add some rough filters to your custom view - they'll work just like you want, and when an official solution becomes available, you can use that then.
I'm having a little bit of a hard time getting into mvvm. I'm writing a simple app, Notebook. I have one viewmodel, it's name is actually ViewModel. It has an ObservableCollection of Notes inside and methods to save and load those from Isolated Storage. My only Model is Note.cs, it implements INotifyPropertyChanged and I'm of course RaisingPropertyChanged.
I've also got two view, both of them are user controls. One to display list of notes and one to edit the one chosen from the list.
My questions are:
Where do I create an instance of my vievmodel?
How should I implement going from the page with list of notes to the page with detailed view after choosing one Note to edit? At the
moment I'm saving the index of Note in App.xaml.cs, going to the next page and setting
the DetailedView DataContext to the right Note in OnNavigatedTo, but
I don't think it's actually the perfect solution.
Where should I save my Notes? I guess Application_Closing in App.xaml.cs is the right place to do it, but I'd have to have my viewmodel as a global object there, is this the right approach?
Additional question:
I have to add possibility to group notes. I guess that class Group with dictionary (GroupName, howManyNotes) is going to be allright since I don't have to be able to for example write all notes from selected group. Do you think there's a better approach I should think about?
Thanks for respones,
Michał.
I would suggest you take a look at Calibrun.Micro which is a great framework for MVVM. You can get some sample from the CodePlex.
I have used that in a bunch of Project, and will give you flexibility in case if your project grows in size.
Google for Caliburn.Micro sample and you will find a number of sample for all technologies like WPF, Silverlight, Windows Store, Windows Mobile.
Caliburn.Micro CodePlex
I have a very simple application, and i want to add into it a database. For all of you, to understand what i mean, it should look similar like default application "Contacts" in iPhone. It should contain list of elements (like people names in contact list), and when the user click name, the next view appear, which contain information about contact (and other buttons as well). All of data must be inside of application (not downloading from web pages).
Please help me! I am novice, and i have no clue what i should looking for, not just an array i guess... i will gratefully accept any of advice and links to examples, related to my problem.
PS. My app is not about contacts, its about diet. For example, it should look like: user click element "cheese" in list, and then next view provide information about product (calories, protein, fat etc.)
Take a look at the following free lessons from iTunes U. Paul Hegarty is an excellent teacher. These are dense so I had to watch a couple times, but everything you need is here:
Basic Persistence:
http://www.stanford.edu/class/cs193p/cgi-bin/drupal/node/285
Core Data (Lecture):
http://www.stanford.edu/class/cs193p/cgi-bin/drupal/node/287
Core Data Demo:
http://www.stanford.edu/class/cs193p/cgi-bin/drupal/node/289
These pages have the pdfs, but go to iTunes and download the full lectures for an excellent overview. Also don't miss the CoreDataTableViewController available on the last linked page - handy.
Without this course I would not be an iOS developer, so I can't recommend it highly enough.
Enjoy,
Damien
I am building a fairly simple website based on typo3. I'm new to the CMS but I've read almost everything I could find about it - tutorials, wikis, documentation. I'm stuck with designing a functionality for the administrator to be able to create records with predefined attributes (category, date, info, image, ...) and those records to be listed in a table on the front end with a "View detailed" link on each row. Will I need to develop a complete extension for this? From where the administrator will enter these records? How can I iterate them on the front end?
I apologize in advance if my question is too broad.
The Kickstarter extension provides a full stop solution for your needs. There is a good set of, if slightly outdated, screencasts explaining how to use this extension to create your custom record types and associated front-end views.
Can you provide me a basic iPhone example which has the following;
a. It is primarily a navigation-based app (Top-level view, Detail view, etc)
b. It also uses table (to present list of items, item details, add, edit, delete)
c. It uses Core Data for storing the list items
d. Optionally, it would be really great if it uses an API for retrieving some of the table data (otherwise user entered if API does not return).
While I do have individual examples for all these thing, I ma basically looking for an example which kind of combines all these things into a single app.
I have already gone through some of the IOS developer reference and hence would want other combined examples.
Any reference examples would be highly appreciated.
Thanks a lot.
Have you looked through the iOS Sample Code library? You'll find examples of all these. They have TopSongs (API, Navigation Views, Table Views, Core Data) and CoreDataBooks for Core Data.
If you create a project using the Navigation based template and select "Use Core Data" you will get the skeleton of exactly the type of app you want.
Examples covering all of those are on Apple's developer website, developer.apple.com.
I used this one is one, to learn this: http://icodeblog.com/2008/08/19/iphone-programming-tutorial-creating-a-todo-list-using-sqlite-part-1/#create-db