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stringlengths 1
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), |
), |
); |
} |
future<void> _incrementCounter() async { |
SharedPreferences prefs = await SharedPreferences.getInstance(); |
int counter = (prefs.getint('counter') ?? 0) + 1; |
await prefs.setInt('counter', counter); |
} |
<code_end> |
<topic_end> |
<topic_start> |
how do i access SQLite in flutter? |
in android, you use SQLite to store structured data |
that you can query using SQL. |
in flutter, for macOS, android, or iOS, |
access this functionality using the |
SQFlite plugin. |
<topic_end> |
<topic_start> |
debugging |
<topic_end> |
<topic_start> |
what tools can i use to debug my app in flutter? |
use the DevTools suite for debugging flutter or dart apps. |
DevTools includes support for profiling, examining the heap, |
inspecting the widget tree, logging diagnostics, debugging, |
observing executed lines of code, debugging memory leaks and memory |
fragmentation. for more information, see the |
DevTools documentation. |
<topic_end> |
<topic_start> |
notifications |
<topic_end> |
<topic_start> |
how do i set up push notifications? |
in android, you use firebase cloud messaging to set up |
push notifications for your app. |
in flutter, access this functionality using the |
firebase messaging plugin. |
for more information on using the firebase cloud messaging API, |
see the firebase_messaging plugin documentation. |
<topic_end> |
<topic_start> |
flutter for SwiftUI developers |
SwiftUI developers who want to write mobile apps using flutter |
should review this guide. |
it explains how to apply existing SwiftUI knowledge to flutter. |
info note |
if you instead have experience building apps for iOS with UIKit, |
see flutter for UIKit developers. |
flutter is a framework for building cross-platform applications |
that uses the dart programming language. |
to understand some differences between programming with dart |
and programming with swift, see learning dart as a swift developer |
and flutter concurrency for swift developers. |
your SwiftUI knowledge and experience |
are highly valuable when building with flutter. |
flutter also makes a number of adaptations |
to app behavior when running on iOS and macOS. |
to learn how, see platform adaptations. |
info |
to integrate flutter code into an existing iOS app, |
check out add flutter to existing app. |
this document can be used as a cookbook by jumping around |
and finding questions that are most relevant to your needs. |
this guide embeds sample code. |
you can test full working examples on DartPad or view them on GitHub. |
<topic_end> |
<topic_start> |
overview |
as an introduction, watch the following video. |
it outlines how flutter works on iOS and how to use flutter to build iOS apps. |
flutter and SwiftUI code describes how the UI looks and works. |
developers call this type of code a declarative framework. |
<topic_end> |
<topic_start> |
views vs. widgets |
SwiftUI represents UI components as views. |
you configure views using modifiers. |
flutter represents UI components as widgets. |
both views and widgets only exist until they need to be changed. |
these languages call this property immutability. |
SwiftUI represents a UI component property as a view modifier. |
by contrast, flutter uses widgets for both UI components and |
their properties. |
to compose layouts, both SwiftUI and flutter nest UI components |
within one another. |
SwiftUI nests views while flutter nests widgets. |
<topic_end> |
<topic_start> |
layout process |
SwiftUI lays out views using the following process: |
flutter differs somewhat with its process: |
flutter differs from SwiftUI because the parent component can override |
the child’s desired size. the widget cannot have any size it wants. |
it also cannot know or decide its position on screen as its parent |
makes that decision. |
to force a child widget to render at a specific size, |
the parent must set tight constraints. |
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