{"id":99353,"date":"2021-03-05T04:22:37","date_gmt":"2021-03-05T02:22:39","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/google-predstavil-frejmvork-flutter-2-i-yazyk-dart-2-12"},"modified":"2021-03-05T04:22:37","modified_gmt":"2021-03-05T02:22:39","slug":"google-predstavil-frejmvork-flutter-2-i-yazyk-dart-2-12","status":"publish","type":"post","link":"https:\/\/prohoster.info\/da\/blog\/news\/google-predstavil-frejmvork-flutter-2-i-yazyk-dart-2-12","title":{"rendered":"Google har pr\u00e6senteret rammev\u00e6rket Flutter 2 og sproget Dart 2.12","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Google har pr\u00e6senteret brugergr\u00e6nseflade-rammen Flutter 2, som markerede en transformation af projektet fra en ramme til udvikling af mobilapplikationer til en universel ramme til skabelse af alle typer programmer, herunder programmer til desktops og webapplikationer. <\/p>\n

Flutter betragtes som et alternativ til React Native og g\u00f8r det muligt at udgive applikationer til forskellige platforme baseret p\u00e5 en enkelt kodebase, herunder iOS, Android, Windows, macOS og Linux, samt applikationer til k\u00f8rsel i browsere. Mobilapplikationer, der tidligere blev skrevet med Flutter 1, vil kunne tilpasses til brug p\u00e5 desktop og web uden at skulle omskrives, n\u00e5r de opgraderes til Flutter 2. <\/p>\n

Den prim\u00e6re del af Flutter-koden er implementeret i Dart-sprog, mens runtime-motoren til udf\u00f8relse af applikationer er skrevet i C++. Ved udvikling af applikationer kan man, ud over det native Dart-sprog for Flutter, bruge Dart Foreign Function-interfacet til at kalde kode skrevet i C\/C++. H\u00f8j ydeevne opn\u00e5s ved at kompilere applikationer til maskinkode til de specifikke platforme. Applikationen beh\u00f8ver dog ikke at blive recompilatoreret efter hver \u00e6ndring \u2014 Dart tilbyder en hot reload-tilstand, der g\u00f8r det muligt at foretage \u00e6ndringer i en k\u00f8rende applikation og straks se resultaterne. <\/p>\n

Flutter 2 tilbyder fuld st\u00f8tte til oprettelse af webapplikationer, der er velegnede til kommerciel brug. Der n\u00e6vnes tre prim\u00e6re anvendelsesscenarier for Flutter til web: udvikling af s\u00e6rskilte webapplikationer (PWA, Progressive Web Apps), oprettelse af en-sides webapplikationer (SPA, Single Page Apps) og transformering af mobilapplikationer til webapplikationer. Blant funktionerne for udviklingsv\u00e6rkt\u00f8jer til web fremh\u00e6ves brugen af mekanismer til acceleration af rendering af 2D- og 3D-grafik, fleksibel sammens\u00e6tning af elementer p\u00e5 sk\u00e6rmen og en kompil\u00e9rbar renderer baseret p\u00e5 WebAssembly med navnet CanvasKit. <\/p>\n

St\u00f8tten til desktop-applikationer er i beta-test og vil blive stabiliseret i \u00e5r i en af de kommende udgivelser. Canonical, Microsoft og Toyota har erkl\u00e6ret st\u00f8tte til udviklingen med Flutter. Canonical har valgt Flutter som den prim\u00e6re ramme for sine applikationer og anvender blandt andet Flutter til udviklingen af den nye installationsprogram til Ubuntu. Microsoft har tilpasset Flutter til foldbare enheder med flere sk\u00e6rme, s\u00e5som Surface Duo. Toyota planl\u00e6gger at bruge Flutter til bilers informations- og underholdningssystemer. Den brugergr\u00e6nseflade, der udvikles af Google, til den mikrokernel-operativsystem Fuchsia, er ogs\u00e5 bygget p\u00e5 Flutter.

\"Google<\/center> <\/p>\n

Samtidig blev der udgivet en version af programmeringssproget Dart 2.12, hvor udviklingen af den grundl\u00e6ggende omarbejdede gren af Dart 2 forts\u00e6tter. Dart 2 adskiller sig fra den oprindelige version af sproget Dart ved at anvende st\u00e6rk statisk typetjek (typer kan automatisk udledes, s\u00e5 det er ikke n\u00f8dvendigt at angive typer, men dynamisk typetjek anvendes ikke l\u00e6ngere, og den oprindeligt beregnede type fastl\u00e6gges for variablen og anvendes derefter med streng typetjek). <\/p>\n

Udgivelsen er bem\u00e6rkelsesv\u00e6rdig ved stabiliseringen af den sikre brug af v\u00e6rdi \"Null\" (null safety), hvilket forhindrer nedbrud for\u00e5rsaget af fors\u00f8g p\u00e5 at bruge variabler, hvis v\u00e6rdi ikke er defineret og er sat til \"Null\". Tilstanden indeb\u00e6rer, at variabler ikke kan have udefinerede v\u00e6rdier, medmindre de eksplicit tildeles en null-v\u00e6rdi. I tilstanden tages variablens typer strengt i betragtning, hvilket giver compileren mulighed for at anvende yderligere optimeringer. Typeoverensstemmelse kontrolleres p\u00e5 kompileringstidspunktet; for eksempel vil der blive genereret en fejl, hvis man fors\u00f8ger at tildele v\u00e6rdien \"Null\" til en variabel med en type, der ikke tillader usikker tilstand, s\u00e5som \"int\". <\/p>\n

En anden vigtig forbedring i Dart 2.12 var den stabile implementering af FFI-biblioteket, som muligg\u00f8r oprettelsen af h\u00f8jtydende kode, der kan tilg\u00e5 API'er p\u00e5 C-sprog. Der er udf\u00f8rt ydelses- og st\u00f8rrelsesoptimeringer. Der er tilf\u00f8jet v\u00e6rkt\u00f8jer til udviklere og et system til profilering af kode, der er skrevet med Flutter, s\u00e5vel som nye plugins til app-udvikling p\u00e5 Dart og Flutter for Android Studio\/IntelliJ og VS Code.

\"Google<\/center>
\n
Kilde: opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

\u041a\u043e\u043c\u043f\u0430\u043d\u0438\u044f Google \u043f\u0440\u0435\u0434\u0441\u0442\u0430\u0432\u0438\u043b\u0430 \u0444\u0440\u0435\u0439\u043c\u0432\u043e\u0440\u043a \u043f\u043e\u0441\u0442\u0440\u043e\u0435\u043d\u0438\u044f \u0438\u043d\u0442\u0435\u0440\u0444\u0435\u0439\u0441\u0430 \u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u0442\u0435\u043b\u044f Flutter 2, \u043a\u043e\u0442\u043e\u0440\u044b\u0439 \u043e\u0437\u043d\u0430\u043c\u0435\u043d\u043e\u0432\u0430\u043b \u0442\u0440\u0430\u043d\u0441\u0444\u043e\u0440\u043c\u0430\u0446\u0438\u044e \u043f\u0440\u043e\u0435\u043a\u0442\u0430 \u0438\u0437 \u0444\u0440\u0435\u0439\u043c\u0432\u043e\u0440\u043a\u0430 \u0434\u043b\u044f \u0440\u0430\u0437\u0440\u0430\u0431\u043e\u0442\u043a\u0438 \u043c\u043e\u0431\u0438\u043b\u044c\u043d\u044b\u0445 \u043f\u0440\u0438\u043b\u043e\u0436\u0435\u043d\u0438\u0439 \u0432 \u0443\u043d\u0438\u0432\u0435\u0440\u0441\u0430\u043b\u044c\u043d\u044b\u0439 \u0444\u0440\u0435\u0439\u043c\u0432\u043e\u0440\u043a \u0434\u043b\u044f \u0441\u043e\u0437\u0434\u0430\u043d\u0438\u044f \u043b\u044e\u0431\u044b\u0445 \u0442\u0438\u043f\u043e\u0432 \u043f\u0440\u043e\u0433\u0440\u0430\u043c\u043c, \u0432\u043a\u043b\u044e\u0447\u0430\u044f \u043f\u0440\u043e\u0433\u0440\u0430\u043c\u043c\u044b \u0434\u043b\u044f \u043d\u0430\u0441\u0442\u043e\u043b\u044c\u043d\u044b\u0445 \u0441\u0438\u0441\u0442\u0435\u043c \u0438 web-\u043f\u0440\u0438\u043b\u043e\u0436\u0435\u043d\u0438\u044f. Flutter \u0440\u0430\u0441\u0441\u043c\u0430\u0442\u0440\u0438\u0432\u0430\u0435\u0442\u0441\u044f \u043a\u0430\u043a \u0430\u043b\u044c\u0442\u0435\u0440\u043d\u0430\u0442\u0438\u0432\u0430 React Native \u0438 \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u0435\u0442 \u043d\u0430 \u043e\u0441\u043d\u043e\u0432\u0435 \u043e\u0434\u043d\u043e\u0439 \u043a\u043e\u0434\u043e\u0432\u043e\u0439 \u0431\u0430\u0437\u044b \u0432\u044b\u043f\u0443\u0441\u043a\u0430\u0442\u044c \u043f\u0440\u0438\u043b\u043e\u0436\u0435\u043d\u0438\u044f \u0434\u043b\u044f \u0440\u0430\u0437\u043d\u044b\u0445 \u043f\u043b\u0430\u0442\u0444\u043e\u0440\u043c, \u0432\u043a\u043b\u044e\u0447\u0430\u044f iOS, Android, […]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":1,"featured_media":99354,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[702],"tags":[],"class_list":["post-99353","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-news"],"aioseo_notices":[],"aioseo_head":"\n\t\t\n\t\n\t\n\t\n\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\n","aioseo_head_json":{"title":"\ud83e\udd47Google pr\u00e6senterede rammev\u00e6rket Flutter 2 og sproget Dart 2.12 | ProHoster","description":"Google har pr\u00e6senteret UI-rammen Flutter 2, som markerer transformationen af projektet fra en ramme til mobilapp-udvikling til en universel ramme til oprettelse.","canonical_url":"https:\/\/prohoster.info\/da\/blog\/news\/google-predstavil-frejmvork-flutter-2-i-yazyk-dart-2-12","robots":"max-image-preview:large","keywords":"","webmasterTools":{"miscellaneous":""},"schema":null,"og:locale":"da_DK","og:site_name":"ProHoster | \u041a\u0443\u043f\u0438\u0442\u044c \u043d\u0430\u0434\u0435\u0436\u043d\u044b\u0439 \u0445\u043e\u0441\u0442\u0438\u043d\u0433 \u0434\u043b\u044f \u0441\u0430\u0439\u0442\u043e\u0432 \u0441 \u0437\u0430\u0449\u0438\u0442\u043e\u0439 \u043e\u0442 DDoS, VPS VDS \u0441\u0435\u0440\u0432\u0435\u0440\u044b","og:type":"article","og:title":"\ud83e\udd47Google \u043f\u0440\u0435\u0434\u0441\u0442\u0430\u0432\u0438\u043b \u0444\u0440\u0435\u0439\u043c\u0432\u043e\u0440\u043a Flutter 2 \u0438 \u044f\u0437\u044b\u043a Dart 2.12 | ProHoster","og:description":"\u041a\u043e\u043c\u043f\u0430\u043d\u0438\u044f Google \u043f\u0440\u0435\u0434\u0441\u0442\u0430\u0432\u0438\u043b\u0430 \u0444\u0440\u0435\u0439\u043c\u0432\u043e\u0440\u043a \u043f\u043e\u0441\u0442\u0440\u043e\u0435\u043d\u0438\u044f \u0438\u043d\u0442\u0435\u0440\u0444\u0435\u0439\u0441\u0430 \u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u0442\u0435\u043b\u044f Flutter 2, \u043a\u043e\u0442\u043e\u0440\u044b\u0439 \u043e\u0437\u043d\u0430\u043c\u0435\u043d\u043e\u0432\u0430\u043b \u0442\u0440\u0430\u043d\u0441\u0444\u043e\u0440\u043c\u0430\u0446\u0438\u044e \u043f\u0440\u043e\u0435\u043a\u0442\u0430 \u0438\u0437 \u0444\u0440\u0435\u0439\u043c\u0432\u043e\u0440\u043a\u0430 \u0434\u043b\u044f \u0440\u0430\u0437\u0440\u0430\u0431\u043e\u0442\u043a\u0438 \u043c\u043e\u0431\u0438\u043b\u044c\u043d\u044b\u0445 \u043f\u0440\u0438\u043b\u043e\u0436\u0435\u043d\u0438\u0439 \u0432 \u0443\u043d\u0438\u0432\u0435\u0440\u0441\u0430\u043b\u044c\u043d\u044b\u0439 \u0444\u0440\u0435\u0439\u043c\u0432\u043e\u0440\u043a \u0434\u043b\u044f \u0441\u043e\u0437\u0434\u0430\u043d\u0438\u044f.","og:url":"https:\/\/prohoster.info\/da\/blog\/news\/google-predstavil-frejmvork-flutter-2-i-yazyk-dart-2-12","og:image":"https:\/\/prohoster.info\/wp-content\/uploads\/2021\/11\/logo-350.jpg","og:image:secure_url":"https:\/\/prohoster.info\/wp-content\/uploads\/2021\/11\/logo-350.jpg","og:image:width":350,"og:image:height":350,"article:published_time":"2021-03-05T02:22:39+00:00","article:modified_time":"2021-03-05T02:22:39+00:00","article:publisher":"https:\/\/www.facebook.com\/prohoster","article:author":"https:\/\/www.facebook.com\/prohoster"},"aioseo_meta_data":{"post_id":"99353","title":null,"description":null,"keywords":null,"keyphrases":null,"primary_term":null,"canonical_url":null,"og_title":null,"og_description":null,"og_object_type":"default","og_image_type":"default","og_image_url":null,"og_image_width":null,"og_image_height":null,"og_image_custom_url":null,"og_image_custom_fields":null,"og_video":null,"og_custom_url":null,"og_article_section":null,"og_article_tags":null,"twitter_use_og":false,"twitter_card":"default","twitter_image_type":"default","twitter_image_url":null,"twitter_image_custom_url":null,"twitter_image_custom_fields":null,"twitter_title":null,"twitter_description":null,"schema":{"blockGraphs":[],"customGraphs":[],"default":{"data":{"Article":[],"Course":[],"Dataset":[],"FAQPage":[],"Movie":[],"Person":[],"Product":[],"ProductReview":[],"Car":[],"Recipe":[],"Service":[],"SoftwareApplication":[],"WebPage":[]},"graphName":"","isEnabled":true},"graphs":[]},"schema_type":null,"schema_type_options":null,"pillar_content":false,"robots_default":true,"robots_noindex":false,"robots_noarchive":false,"robots_nosnippet":false,"robots_nofollow":false,"robots_noimageindex":false,"robots_noodp":false,"robots_notranslate":false,"robots_max_snippet":null,"robots_max_videopreview":null,"robots_max_imagepreview":"large","priority":null,"frequency":null,"local_seo":null,"seo_analyzer_scan_date":null,"breadcrumb_settings":null,"limit_modified_date":false,"reviewed_by":null,"ai":null,"created":"2021-03-05 02:31:39","updated":"2022-10-01 23:29:04","focus_keyword":null,"additional_keywords":null,"truseo_locale":null},"gt_translate_keys":[{"key":"link","format":"url"}],"_links":{"self":[{"href":"https:\/\/prohoster.info\/da\/wp-json\/wp\/v2\/posts\/99353","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/prohoster.info\/da\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/prohoster.info\/da\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/prohoster.info\/da\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/prohoster.info\/da\/wp-json\/wp\/v2\/comments?post=99353"}],"version-history":[{"count":0,"href":"https:\/\/prohoster.info\/da\/wp-json\/wp\/v2\/posts\/99353\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/prohoster.info\/da\/wp-json\/wp\/v2\/media\/99354"}],"wp:attachment":[{"href":"https:\/\/prohoster.info\/da\/wp-json\/wp\/v2\/media?parent=99353"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/prohoster.info\/da\/wp-json\/wp\/v2\/categories?post=99353"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/prohoster.info\/da\/wp-json\/wp\/v2\/tags?post=99353"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}