JustPersist | safest way to do persistence on iOS with Core Data support | iOS library
kandi X-RAY | JustPersist Summary
kandi X-RAY | JustPersist Summary
At Just Eat, we persist a variety of data in the iOS app. In 2014 we decided to use MagicalRecord as a wrapper on top of Core Data but over time the numerous problems and fundamental thread-safety issues, arose. In 2017, MagicalRecord is not supported anymore and new solutions look more appealing. We decided to adopt Skopelos: a much younger and lightweight Core Data stack, with a simpler design, developed by Alberto De Bortoli, one of our engineers. The design of the persistence layer interface gets inspiration from Skopelos as well, and we invite the reader to take a look at its documentation. The main problem in adopting a new persistence solution is migrating to it. It is rarely easy, especially if the legacy codebase doesn't hide the adopted framework (in our case MagicalRecord) but rather spread it around in view controllers, managers, helper classes, categories and sometimes views. Ultimately, in the case of Core Data, there is a single persistent store and this is enough to make impossible to move access across "one at a time". There can only be one active persistence solution at a time. We believe this is a very common problem, especially in the mobile world. We created JustPersist for this precise reason and to ease the migration process.
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QUESTION
so I'am trying to learn dart and flutter and everything went well so far. But now I'am stuck at an error which I cannot handle. I coded a function which is supposed to asynchronously return the actual BTC price from https://blockchain.info/ticker.
Only thing it returns is errors:
...ANSWER
Answered 2022-Mar-29 at 00:29To get rid of that error you need to use the bang operator to tell the compiler that snapshot.data won't be null.
QUESTION
ANSWER
Answered 2022-Mar-19 at 06:15My suggestion is to use ion-footer.
QUESTION
Very new to react native and javascript... I am trying to call a function and it doesn't seem to do anything.
Here is the fragment of code where the function is called:
...ANSWER
Answered 2022-Feb-24 at 16:20You need to start your component with a capital letter:
Note: Always start component names with a capital letter.
so change renderButtons to RenderButtons
QUESTION
What I'm trying to do is make a counter in Flutter which will be in this shape:
I'm fairly new regarding flutter and dart so I have tried to put this element inside of a Card but yeah I faced some issues due to overflow and it would be great if someone could give me a hint or point me to the right direction.
Here is my code for counter:
...ANSWER
Answered 2022-Feb-09 at 20:19Create a container and add decoration to it. Then inside the container use a row widget. In row use Iconbutton and text .
QUESTION
I'm building an app where I have a page which gives information about a specific trading card. I want the page to be scrollable, but I also want to have a grid on the page, with each grid cell showing one data point. I made the grid using GridView.count().
My problem is that instead of have a page which I can scroll through, the top half of the page stays static, while the grid is scrollable. How do I make the grid static, while the rest of the page scrollable? I intend to have more data below this grid as well, and I want to user to be able to scroll to see all of it, with the grid being a static component of the page.
Here's my code:
...ANSWER
Answered 2022-Feb-06 at 09:47You can provide physics: NeverScrollableScrollPhysics() on GridView to disable scroll effect. If you want scrollable as secondary widget use primary: false,
To have Full Page scrollable, you can use body:SingleChildScrollView(..) or better using body:CustomScrollView(..)
QUESTION
I am posting this question to help future readers. After upgrading to Flutter 2.8 I suddenly got this error when trying to run my app:
ANSWER
Answered 2021-Dec-26 at 14:20Turns out this error was caused by a popular library I used (settings_ui) that does not work with this version of Flutter (settings_ui: ^1.0.0).
For future readers: Use a later version of this package. There is currently an open issue on github that addresses this.
Update 2022: Dev on settings_ui seems to have gone AWOL and no longer merging PR's the community has forked this project to: https://pub.dev/packages/flutter_settings_ui and here updates are properly merged and a fix has been released in version 1.0.1
For people facing this issue now:
As a monkey patch you can follow the steps in the GitHub issue and edit the package files locally:
In cupertino_settings_item.dart
change final ListTileTheme tileTheme = ListTileTheme.of(context); to final tileTheme = ListTileTheme.of(context);
And change _iconColor(ThemeData theme, ListTileTheme tileTheme) to _iconColor(ThemeData theme, ListTileThemeData tileTheme).
QUESTION
I use this code to scroll:
...ANSWER
Answered 2021-Oct-26 at 05:16what i did, use a listView and reverse true and in children use the list of map.reversed, i am giving you my code example below.
QUESTION
I am fairly new to the Firemonkey framework after working with VCL for many years so hopefully this question is not too simple.
I am listing Dynamic Listview Items which I update from a database. I have created the position/layout of the text within the Listview Item using design mode . My question is when I change screen orientation from portrait to landscape do I have to manually change the 'X' position of the text items located within my listview and their width so that the full landscape width of the screen is utilized? There appears to be no anchors for dynamically created Listview items. (The text items just have their generic names for the time being.)
I have a pic below of what I am trying to describe. First pic shows deign mode in portrait and second in landscape.
Any suggestions greatly appreciated.
...ANSWER
Answered 2021-Dec-22 at 23:30The Accessory, Detail and Text items have an Align property that can take values Center, Leading or Trailing. They are recalculated and adjust their position with changes in the screen orientation.
Additionally some items have a separate property, TextAlign, which sets the position for a text within the space of the Align result.
QUESTION
I used this flutter package to implement a color picker in my app. My Widget looks something like this:
ANSWER
Answered 2021-Dec-19 at 00:02please check out this and you need to palette type as paletteType: PaletteType.hueWheel,. use the same package as used.
QUESTION
I have a mobile application developed using Ionic. Now I want to redevelop it in flutter and publish a new update, would that be possible? will google play and AppStore allow that?
...ANSWER
Answered 2021-Dec-17 at 19:07There is no constraint on development language. But,
- You need to use same certificates/keys for iOS App
- You need to use same key-store/keys for Android App
- If you are using local database or file storage, then you should follow the same path in your newly created app as well. If you are using any third-party library to manage the db or file paths, then it may be in different location altogether. (This one actually happened to me. When I migrated my app from a cross-platform framework to Native the database path got changed in release version)
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