{"id":2161,"date":"2021-07-16T08:04:48","date_gmt":"2021-07-16T08:04:48","guid":{"rendered":"https:\/\/www.bearloga.space\/?page_id=2161"},"modified":"2021-07-16T08:04:48","modified_gmt":"2021-07-16T08:04:48","slug":"urok-6-asinhronnye-metody-async-i-await","status":"publish","type":"page","link":"https:\/\/www.bearloga.space\/uk\/urok-6-asinhronnye-metody-async-i-await\/","title":{"rendered":"\u0423\u0440\u043e\u043a 6. \u0410\u0441\u0438\u043d\u0445\u0440\u043e\u043d\u043d\u044b\u0435 \u043c\u0435\u0442\u043e\u0434\u044b async \u0438 await"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">\u041f\u0440\u043e\u0433\u0440\u0430\u043c\u043c\u0438\u0440\u0443\u044f \u043d\u0430 Flutter \u043d\u0435\u0432\u043e\u0437\u043c\u043e\u0436\u043d\u043e \u0438\u0437\u0431\u0435\u0436\u0430\u0442\u044c \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u043d\u0438\u044f \u0430\u0441\u0438\u043d\u0445\u0440\u043e\u043d\u043d\u044b\u0445 \u043c\u0435\u0442\u043e\u0434\u043e\u0432, \u0442\u0430\u043a\u0438\u0445 \u043a\u0430\u043a \u0447\u0442\u0435\u043d\u0438\u0435 \u0434\u0430\u043d\u043d\u044b\u0445 \u0438\u0437 \u0441\u0435\u0442\u0438 \u0438\u043d\u0442\u0435\u0440\u043d\u0435\u0442, \u0444\u0430\u0439\u043b\u043e\u0432 \u0438 \u0431\u0430\u0437 \u0434\u0430\u043d\u043d\u044b\u0445. \u0420\u0430\u0431\u043e\u0442\u0430 \u0442\u0430\u043a\u0438\u0445 \u043c\u0435\u0442\u043e\u0434\u043e\u0432 \u0432\u044b\u0432\u043e\u0434\u0438\u0442\u0441\u044f \u0432 \u043e\u0442\u0434\u0435\u043b\u044c\u043d\u044b\u0435 \u043f\u043e\u0442\u043e\u043a\u0438 \u0438 \u043d\u0435 \u043d\u0430\u0440\u0443\u0448\u0430\u0435\u0442 \u0440\u0430\u0431\u043e\u0442\u044b \u043e\u0441\u043d\u043e\u0432\u043d\u043e\u0433\u043e \u043f\u043e\u0442\u043e\u043a\u0430 \u043f\u0440\u043e\u0433\u0440\u0430\u043c\u043c\u044b: \u0432\u044b\u0447\u0438\u0441\u043b\u0435\u043d\u0438\u0435 \u0438 \u043e\u0442\u043e\u0431\u0440\u0430\u0436\u0435\u043d\u0438\u0435 \u0438\u043d\u0442\u0435\u0440\u0444\u0435\u0439\u0441\u0430. \u041e\u0434\u043d\u0438\u043c \u0441\u043b\u043e\u0432\u043e\u043c, \u0444\u0443\u043d\u043a\u0446\u0438\u0438 \u043a\u043e\u0442\u043e\u0440\u044b\u0435 \u0432\u044b\u043f\u043e\u043b\u043d\u044f\u044e\u0442\u0441\u044f \u043e\u0442\u043d\u043e\u0441\u0438\u0442\u0435\u043b\u044c\u043d\u043e \u0434\u043e\u043b\u0433\u043e \u2014 \u0434\u043e\u043b\u0436\u043d\u044b \u0431\u044b\u0442\u044c \u0430\u0441\u0438\u043d\u0445\u0440\u043e\u043d\u043d\u044b\u043c\u0438.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u0412 \u044d\u0442\u043e\u043c \u0443\u0440\u043e\u043a\u0435 \u043c\u044b \u043d\u0430\u0443\u0447\u0438\u043c\u0441\u044f \u0441\u043e\u0441\u0442\u0430\u0432\u043b\u044f\u0442\u044c \u0438 \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u0442\u044c \u0442\u0430\u043a\u0438\u0435 \u043c\u0435\u0442\u043e\u0434\u044b. \u0410 \u0443\u0436\u0435 \u0432 \u0441\u043b\u0435\u0434\u0443\u044e\u0449\u0435\u043c \u043d\u0430\u0447\u043d\u0435\u043c \u043f\u043e\u043b\u0443\u0447\u0430\u0442\u044c \u0438 \u043e\u0431\u0440\u0430\u0431\u0430\u0442\u044b\u0432\u0430\u0442\u044c \u0434\u0430\u043d\u043d\u044b\u0435 \u0438\u0437 \u0441\u0435\u0442\u0438 \u0438\u043d\u0442\u0435\u0440\u043d\u0435\u0442.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"part1\">\u0421\u043e\u0437\u0434\u0430\u043d\u0438\u0435 \u0430\u0441\u0438\u043d\u0445\u0440\u043e\u043d\u043d\u043e\u0433\u043e \u043c\u0435\u0442\u043e\u0434\u0430 \u043d\u0430 \u043e\u0431\u0440\u0430\u0437\u0435 \u043f\u0435\u0441\u043e\u0447\u043d\u044b\u0445 \u0447\u0430\u0441\u043e\u0432<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u0421\u043e\u0437\u0434\u0430\u0434\u0438\u043c \u043a\u043b\u0430\u0441\u0441 \u043f\u0435\u0441\u043e\u0447\u043d\u044b\u0435 \u0447\u0430\u0441\u044b, \u0432 \u043a\u043e\u0442\u043e\u0440\u044b\u0445 \u0435\u0441\u0442\u044c 100 \u043f\u0435\u0441\u0447\u0438\u043d\u043e\u043a, \u0438 \u043a\u043e\u0433\u0434\u0430 \u043e\u043d\u0438 \u0432 \u0432\u0435\u0440\u0445\u043d\u0435\u0439 \u0447\u0430\u0441\u0442\u0438, \u0437\u043d\u0430\u0447\u0435\u043d\u0438\u0435&nbsp;<strong>sand=100<\/strong>, \u043a\u043e\u0433\u0434\u0430 \u0432\u0441\u0435 \u043f\u0435\u0441\u0447\u0438\u043d\u043a\u0438 \u0432 \u043d\u0438\u0436\u043d\u0435\u0439 \u0447\u0430\u0441\u0442\u0438 \u2014 \u0442\u043e\u0433\u0434\u0430&nbsp;<strong>sand=0<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">class SandGlass {<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">int _sand = 0;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">}<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u0414\u043e\u0431\u0430\u0432\u0438\u043c \u043c\u0435\u0442\u043e\u0434, \u043a\u043e\u0442\u043e\u0440\u044b\u0439 \u0432\u043e\u0437\u0432\u0440\u0430\u0449\u0430\u0435\u0442 \u0442\u0435\u043a\u0443\u0449\u0438\u0435 \u0441\u043e\u0441\u0442\u043e\u044f\u043d\u0438\u0435, \u043e\u043d \u0431\u0443\u0434\u0435\u0442 \u0441\u0438\u043d\u0445\u0440\u043e\u043d\u043d\u044b\u043c, \u0442.\u0435. \u043f\u043e \u0432\u044b\u0437\u043e\u0432\u0443 \u043e\u043d \u0431\u0443\u0434\u0435\u0442 \u0432\u043e\u0437\u0432\u0440\u0430\u0449\u0430\u0442\u044c \u0442\u0435\u043a\u0443\u0449\u0435\u0435 \u0437\u043d\u0430\u0447\u0435\u043d\u0438\u0435 \u043f\u0440\u0438\u0432\u0430\u0442\u043d\u043e\u0439 \u043f\u0435\u0440\u0435\u043c\u0435\u043d\u043d\u043e\u0439&nbsp;<strong>_sand<\/strong>.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">time(){<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">return _sand;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">}<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u0414\u043e\u0431\u0430\u0432\u0438\u043c \u0430\u0441\u0438\u043d\u0445\u0440\u043e\u043d\u043d\u044b\u0439 \u043c\u0435\u0442\u043e\u0434&nbsp;<strong>tick<\/strong>, \u043e\u043d \u0431\u0443\u0434\u0435\u0442 \u00ab\u043f\u0435\u0440\u0435\u043c\u0435\u0449\u0430\u0442\u044c \u043f\u0435\u0441\u0447\u0438\u043d\u043a\u0438\u00bb \u0438\u0437 \u00ab\u0432\u0435\u0440\u0445\u043d\u0435\u0439 \u0447\u0430\u0441\u0442\u0438\u00bb \u0432 \u043d\u0438\u0436\u043d\u044e\u044e \u0441\u043e \u0441\u043a\u043e\u0440\u043e\u0441\u0442\u044c\u044e 1\/100 [\u043f\u0435\u0441\u0447\u0438\u043d\u043a\u0438\/\u043c\u0438\u043b\u043b\u0438\u0441\u0435\u043a\u0443\u043d\u0434\u044b]. \u0427\u0442\u043e\u0431\u044b \u043c\u0435\u0442\u043e\u0434 \u0431\u044b\u043b \u0430\u0441\u0438\u043d\u0445\u0440\u043e\u043d\u043d\u044b\u043c, \u043d\u0443\u0436\u043d\u043e \u0443\u043a\u0430\u0437\u0430\u0442\u044c \u043c\u043e\u0434\u0438\u0444\u0438\u043a\u0430\u0442\u043e\u0440&nbsp;<strong>async<\/strong>&nbsp;\u043c\u0435\u0436\u0434\u0443 \u0441\u0438\u0433\u043d\u0430\u0442\u0443\u0440\u043e\u0439 \u0444\u0443\u043d\u043a\u0446\u0438\u0438 \u0438 \u0435\u0435 \u0442\u0435\u043b\u043e\u043c.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">tick() async {<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">}<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u0415\u0449\u0435 \u043c\u043e\u0436\u043d\u043e \u043d\u0430\u043f\u0438\u0441\u0430\u0442\u044c \u044d\u0442\u0443 \u0444\u0443\u043d\u043a\u0446\u0438\u044e \u0442\u0430\u043a:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Future tick() async {<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">}<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u041e\u0431\u0430 \u0432\u0430\u0440\u0438\u0430\u043d\u0442\u0430 \u0434\u0430\u044e\u0442 \u043e\u0434\u0438\u043d\u0430\u043a\u043e\u0432\u044b\u0439 \u0440\u0435\u0437\u0443\u043b\u044c\u0442\u0430\u0442: \u0432\u044b\u0437\u044b\u0432\u0430\u044f \u0430\u0441\u0438\u043d\u0445\u0440\u043e\u043d\u043d\u0443\u044e \u0444\u0443\u043d\u043a\u0446\u0438\u044e \u043c\u044b \u0432\u0441\u0435\u0433\u0434\u0430 \u043f\u043e\u043b\u0443\u0447\u0430\u0435\u043c \u0432 \u043e\u0442\u0432\u0435\u0442&nbsp;<strong>Future<\/strong>&nbsp;\u2014 \u043e\u0431\u0435\u0449\u0430\u043d\u0438\u0435.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u0414\u043b\u044f \u043f\u0440\u043e\u0432\u0435\u0440\u043a\u0438 \u043c\u043e\u0436\u043d\u043e \u0432\u044b\u0432\u0435\u0441\u0442\u0438 \u0432 \u043a\u043e\u043d\u0441\u043e\u043b\u044c \u043b\u044e\u0431\u0443\u044e \u0430\u0441\u0438\u043d\u0445\u0440\u043e\u043d\u043d\u0443\u044e \u0444\u0443\u043d\u043a\u0446\u0438\u044e \u0438 \u0432 \u0432\u044b\u0432\u043e\u0434\u0435 \u0431\u0443\u0434\u0435\u0442 \u043e\u0431\u0435\u0449\u0430\u043d\u0438\u0435&nbsp;<strong>Future<\/strong>:&nbsp;<strong>print(&#8216;${tick()}&#8217;);<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u0414\u043b\u044f \u0440\u0430\u0431\u043e\u0442\u044b \u0441 \u0430\u0441\u0438\u043d\u0445\u0440\u043e\u043d\u043d\u044b\u043c\u0438 \u0444\u0443\u043d\u043a\u0446\u0438\u044f\u043c\u0438 \u043a\u0430\u043a \u0441 \u0441\u0438\u043d\u0445\u0440\u043e\u043d\u043d\u044b\u043c\u0438 \u0441\u043b\u0443\u0436\u0438\u0442&nbsp;<strong>await<\/strong>&nbsp;\u2014 \u043e\u0436\u0438\u0434\u0430\u043d\u0438\u0435.<br><strong>await<\/strong>&nbsp;\u043f\u043e\u0437\u0432\u043e\u043b\u044f\u0435\u0442 \u0434\u043e\u0436\u0434\u0430\u0442\u044c\u0441\u044f \u0432\u044b\u043f\u043e\u043b\u043d\u0435\u043d\u0438\u044f \u0430\u0441\u0438\u043d\u0445\u0440\u043e\u043d\u043d\u043e\u0439 \u0444\u0443\u043d\u043a\u0446\u0438\u0438 \u0438 \u043f\u043e\u0441\u043b\u0435 \u043e\u0431\u0440\u0430\u0431\u043e\u0442\u0430\u0442\u044c \u0440\u0435\u0437\u0443\u043b\u044c\u0442\u0430\u0442, \u0435\u0441\u043b\u0438 \u043e\u043d \u0435\u0441\u0442\u044c.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u0422\u0430\u043a \u043d\u0430\u043f\u0440\u0438\u043c\u0435\u0440 \u0444\u0443\u043d\u043a\u0446\u0438\u044f \u0447\u0442\u0435\u043d\u0438\u044f \u0438\u0437 \u0444\u0430\u0439\u043b\u0430 \u2014 \u0430\u0441\u0438\u043d\u0445\u0440\u043e\u043d\u043d\u0430\u044f \u0444\u0443\u043d\u043a\u0446\u0438\u044f, \u043a\u043e\u0442\u043e\u0440\u0430\u044f \u0432\u043e\u0437\u0432\u0440\u0430\u0449\u0430\u0435\u0442 \u043e\u0436\u0438\u0434\u0430\u043d\u0438\u0435, \u043d\u043e \u043d\u0430\u043c \u043d\u0443\u0436\u0435\u043d \u0440\u0435\u0437\u0443\u043b\u044c\u0442\u0430\u0442 \u0447\u0442\u0435\u043d\u0438\u044f \u2014 \u0441\u043e\u0434\u0435\u0440\u0436\u0438\u043c\u043e\u0435 \u0444\u0430\u0439\u043b\u0430. \u0414\u043b\u044f \u044d\u0442\u043e\u0433\u043e \u043f\u0435\u0440\u0435\u0434 \u0444\u0443\u043d\u043a\u0446\u0438\u0439 \u0447\u0442\u0435\u043d\u0438\u044f \u043c\u044b \u0434\u043e\u043b\u0436\u043d\u044b \u0443\u043a\u0430\u0437\u0430\u0442\u044c&nbsp;<strong>await<\/strong>.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>await<\/strong>&nbsp;\u043c\u043e\u0436\u043d\u043e \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u0442\u044c \u0442\u043e\u043b\u044c\u043a\u043e \u0432\u043d\u0443\u0442\u0440\u0438 \u0430\u0441\u0438\u043d\u0445\u0440\u043e\u043d\u043d\u044b\u0445 \u0444\u0443\u043d\u043a\u0446\u0438\u044f\u0445, \u043d\u0430\u043f\u0440\u0438\u043c\u0435\u0440 \u0432 \u0444\u0443\u043d\u043a\u0446\u0438\u0438 \u043f\u043e\u0441\u0442\u0440\u043e\u0435\u043d\u0438\u044f \u0432\u0438\u0434\u0436\u0435\u0442\u0430 \u0442\u0430\u043a \u0441\u0434\u0435\u043b\u0430\u0442\u044c \u043d\u0435\u043b\u044c\u0437\u044f:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Widget build(BuildContext context) {<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">await clock.tick();<strong>\/\/ \u043e\u0448\u0438\u0431\u043a\u0430<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u0422\u0430\u043a\u0436\u0435 \u043c\u044b \u043d\u0435 \u043c\u043e\u0436\u0435\u043c \u0441\u0434\u0435\u043b\u0430\u0442\u044c&nbsp;<strong>build<\/strong>&nbsp;\u043c\u0435\u0442\u043e\u0434 \u0430\u0441\u0438\u043d\u0445\u0440\u043e\u043d\u043d\u044b\u043c, \u043f\u043e\u0442\u043e\u043c\u0443 \u0447\u0442\u043e \u0432\u043e\u0437\u0432\u0440\u0430\u0449\u0430\u0435\u043c\u044b\u0439 \u0442\u0438\u043f \u0434\u043e\u043b\u0436\u0435\u043d \u0431\u044b\u0442\u044c&nbsp;<strong>Widget<\/strong>, \u0438 \u043d\u0435 \u043c\u043e\u0436\u0435\u0442 \u0431\u044b\u0442\u044c&nbsp;<strong>Future<\/strong>&nbsp;\u0438\u043b\u0438&nbsp;<strong>Future&lt;Widget&gt;<\/strong>.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u041d\u043e \u0437\u0430\u043f\u0443\u0441\u0442\u0438\u0442\u044c \u0430\u0441\u0438\u043d\u0445\u0440\u043e\u043d\u043d\u044b\u0439 \u043c\u0435\u0442\u043e\u0434 \u0432&nbsp;<strong>build<\/strong>&nbsp;\u043d\u0430\u043c \u043d\u0438\u0447\u0435\u0433\u043e \u043d\u0435 \u043c\u0435\u0448\u0430\u0435\u0442:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Widget build(BuildContext context) {<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">clock.tick();<strong>\/\/ \u0437\u0430\u043f\u0443\u0441\u043a \u0430\u0441\u0438\u043d\u0445\u0440\u043e\u043d\u043d\u043e\u0433\u043e \u043c\u0435\u0442\u043e\u0434\u0430<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u041a\u043e\u0433\u0434\u0430 \u043c\u044b \u043f\u0438\u0448\u0435\u043c&nbsp;<strong>tick() async<\/strong>&nbsp;\u0438\u043b\u0438&nbsp;<strong>Future tick() async<\/strong>&nbsp;\u2014 \u0442\u043e \u0440\u0435\u0437\u0443\u043b\u044c\u0442\u0430\u0442 \u0442\u0435\u043b\u0430 \u0444\u0443\u043d\u043a\u0446\u0438\u0438 \u0432\u0441\u0435\u0433\u0434\u0430 \u0434\u0438\u043d\u0430\u043c\u0438\u0447\u0435\u0441\u043a\u0438\u0439.<br>\u041d\u043e \u0435\u0441\u043b\u0438 \u0440\u0435\u0437\u0443\u043b\u044c\u0442\u0430\u0442 \u0444\u0443\u043d\u043a\u0446\u0438\u0438 \u0434\u043e\u043b\u0436\u0435\u043d \u0431\u044b\u0442\u044c \u0442\u0438\u043f\u0430&nbsp;<strong>bool<\/strong>, \u043d\u0430\u043f\u0440\u0438\u043c\u0435\u0440 \u0443\u0441\u043b\u043e\u0432\u043d\u044b\u0439 \u043e\u043f\u0435\u0440\u0430\u0442\u043e\u0440 \u043f\u0440\u0438\u043d\u0438\u043c\u0430\u0435\u0442 \u0442\u043e\u043b\u044c\u043a\u043e&nbsp;<strong>true<\/strong>&nbsp;\u0438\u043b\u0438&nbsp;<strong>false<\/strong>:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">if(await tick()) {<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>\/\/\/&#8230;<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">} else {<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>\/\/\/&#8230;<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">}<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">, \u043d\u0443\u0436\u043d\u043e \u0443\u043a\u0430\u0437\u0430\u0442\u044c \u0432\u043e\u0437\u0432\u0440\u0430\u0449\u0430\u0435\u043c\u044b\u0439 \u0442\u0438\u043f \u0432 \u0441\u043a\u043e\u0431\u043a\u0430\u0445 \u043e\u0431\u0435\u0449\u0430\u043d\u0438\u044f:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Future&lt;bool&gt; tick() async<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"part2\">\u041f\u043e\u043b\u043d\u044b\u0439 \u043b\u0438\u0441\u0442\u0438\u043d\u0433 \u043f\u0440\u043e\u0433\u0440\u0430\u043c\u043c\u044b \u0438 \u0434\u0435\u0442\u0430\u043b\u044c\u043d\u043e\u0435 \u0440\u0430\u0441\u0441\u043c\u043e\u0442\u0440\u0435\u043d\u0438\u0435 \u0435\u0435 \u0440\u0430\u0431\u043e\u0442\u044b<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">import <em>&#8216;package:flutter\/material.dart&#8217;<\/em>;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">class SandGlass {<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">int _sand = 0;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">time(){<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">return _sand;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">}<strong>\/\/time<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Future tick() async {<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">_sand = 100;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">print(<em>&#8216;Start:tick&#8217;<\/em>);<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">while(_sand &gt; 0) {<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">print(<em>&#8216;tick: _sand&#8217;<\/em>);<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">_sand&#8211;;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">await new Future.delayed(const Duration(milliseconds: 100));<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">}<strong>\/\/while<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">print(<em>&#8216;End:tick&#8217;<\/em>);<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">}<strong>\/\/tick<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">}<strong>\/\/SandGlass<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">class MyApp extends StatefulWidget {<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">@override<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">State&lt;StatefulWidget&gt; createState() =&gt; MyAppState();<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">}<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">class MyAppState extends State {<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">SandGlass clock = SandGlass();<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">_reDrawWidget() async {<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">if(clock.time() == 0) return;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">await new Future.delayed(const Duration(seconds: 1));<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">setState(() {print(<em>&#8216;reDrawWidget()&#8217;<\/em>);});<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">}<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">@override<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">void initState() {<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">clock.tick();<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">super.initState();<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">}<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">@override<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Widget build(BuildContext context) {<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">_reDrawWidget();<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">print(<em>&#8216;clock.tick: ${clock.time()}&#8217;<\/em>);<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">return Center(child: Text(<em>&#8216;time is: ${clock.time()}&#8217;<\/em>));<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">}<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">}<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">void main() =&gt; runApp(new MaterialApp(home:Scaffold(body: MyApp())));<\/p>\n\n\n\n<ol class=\"wp-block-list\"><li>\u0421\u0430\u043c\u0430\u044f \u0433\u043b\u0430\u0432\u043d\u0430\u044f \u0444\u0443\u043d\u043a\u0446\u0438\u044f&nbsp;<strong>main<\/strong>, \u0432\u044b\u0437\u044b\u0432\u0430\u0435\u0442 \u0444\u0443\u043d\u043a\u0446\u0438\u044e&nbsp;<strong>runApp<\/strong>. \u0412\u044b\u043f\u043e\u043b\u043d\u044f\u0435\u0442\u0441\u044f \u0432\u044b\u0437\u043e\u0432 \u043e\u0447\u0435\u0440\u0435\u0434\u0438 \u0432\u043b\u043e\u0436\u0435\u043d\u043d\u044b\u0445 \u0432\u0438\u0434\u0436\u0435\u0442\u043e\u0432&nbsp;<strong>MaterialApp:home \/ Scaffold:body \/ MyApp &gt; MyAppState<\/strong><\/li><li>\u0420\u0430\u0441\u0441\u043c\u043e\u0442\u0440\u0438\u043c \u0440\u0430\u0431\u043e\u0442\u0443 MyAppState:<ul><li>\u0412 \u0432\u0438\u0434\u0436\u0435\u0442\u0435 \u0435\u0441\u0442\u044c \u043f\u0430\u0440\u0430\u043c\u0435\u0442\u0440&nbsp;<strong>clock<\/strong>&nbsp;\u2014 \u044d\u043a\u0437\u0435\u043c\u043f\u043b\u044f\u0440 \u043a\u043b\u0430\u0441\u0441\u0430&nbsp;<strong>SandGlass<\/strong>.<\/li><li>\u0410\u0441\u0438\u043d\u0445\u0440\u043e\u043d\u043d\u044b\u0439 \u043c\u0435\u0442\u043e\u0434&nbsp;<strong>_reDrawWidget<\/strong>&nbsp;\u2014 \u0432\u044b\u0437\u044b\u0432\u0430\u0435\u0442 \u043f\u0435\u0440\u0435\u0441\u0442\u0440\u043e\u0435\u043d\u0438\u0435 \u0432\u0438\u0434\u0436\u0435\u0442\u0430&nbsp;<strong>MyApp<\/strong>&nbsp;\u043f\u043e\u0441\u043b\u0435 \u0437\u0430\u0434\u0435\u0440\u0436\u043a\u0438 \u0432 1 \u0441\u0435\u043a\u0443\u043d\u0434\u0443.<\/li><li>\u0417\u0430\u0434\u0435\u0440\u0436\u043a\u0430 \u043f\u0440\u043e\u0438\u0441\u0445\u043e\u0434\u0438\u0442 \u0441 \u043f\u043e\u043c\u043e\u0449\u044c\u044e \u043e\u0436\u0438\u0434\u0430\u043d\u0438\u044f \u0430\u0441\u0438\u043d\u0445\u0440\u043e\u043d\u043d\u043e\u0439 \u0444\u0443\u043d\u043a\u0446\u0438\u0438&nbsp;<strong>await new Future.delayed(const Duration(seconds: 1));<br><\/strong>\u043d\u0435 \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u0443\u0439\u0442\u0435 \u0441\u0438\u043d\u0445\u0440\u043e\u043d\u043d\u0443\u044e \u0444\u0443\u043d\u043a\u0446\u0438\u044e&nbsp;<strong>sleep<\/strong>&nbsp;\u0434\u043b\u044f \u044d\u0442\u0438\u0445 \u0446\u0435\u043b\u0435\u0439.<\/li><li>\u041c\u0435\u0442\u043e\u0434&nbsp;<strong>initState<\/strong>&nbsp;\u043f\u0435\u0440\u0435\u043e\u043f\u0440\u0435\u0434\u0435\u043b\u0435\u043d, \u043e\u043d \u0432\u044b\u0437\u044b\u0432\u0430\u0435\u0442\u0441\u044f \u043e\u0434\u0438\u043d \u0440\u0430\u0437 \u043f\u0440\u0438 \u043f\u043e\u0441\u0442\u0440\u043e\u0435\u043d\u0438\u0438 \u0432\u0438\u0434\u0436\u0435\u0442\u0430 \u0438 \u0438\u043d\u0438\u0446\u0438\u0430\u043b\u0438\u0437\u0438\u0440\u0443\u0435\u0442 \u0437\u0430\u043f\u0443\u0441\u043a \u043f\u0435\u0441\u043e\u0447\u043d\u044b\u0445 \u0447\u0430\u0441\u043e\u0432:&nbsp;<strong>clock.tick()<\/strong>.<\/li><li>\u041c\u0435\u0442\u043e\u0434&nbsp;<strong>build<\/strong>&nbsp;\u0437\u0430\u043f\u0443\u0441\u043a\u0430\u0435\u0442 \u0432\u044b\u043f\u043e\u043b\u043d\u0435\u043d\u0438\u0435 \u0430\u0441\u0438\u043d\u0445\u0440\u043e\u043d\u043d\u043e\u0439 \u0444\u0443\u043d\u043a\u0446\u0438\u0438&nbsp;<strong>_reDrawWidget<\/strong>&nbsp;\u0438 \u0432\u044b\u043f\u043e\u043b\u043d\u044f\u0435\u0442 \u0432\u044b\u0432\u043e\u0434 \u0441\u043e\u0441\u0442\u043e\u044f\u043d\u0438\u044f \u043f\u0435\u0441\u043e\u0447\u043d\u044b\u0445 \u0447\u0430\u0441\u043e\u0432&nbsp;<strong>clock.time()<\/strong>&nbsp;\u0432 \u043a\u043e\u043d\u0441\u043e\u043b\u044c \u0438 \u0432 \u0442\u0435\u043a\u0441\u0442\u043e\u0432\u044b\u0439 \u0432\u0438\u0434\u0436\u0435\u0442.<\/li><\/ul><\/li><li>\u0410\u0441\u0438\u043d\u0445\u0440\u043e\u043d\u043d\u044b\u0439 \u043c\u0435\u0442\u043e\u0434&nbsp;<strong>tick<\/strong>&nbsp;\u0432&nbsp;<strong>SandGlass<\/strong>:<ul><li>\u0437\u0430\u0434\u0430\u0435\u0442 \u0437\u043d\u0430\u0447\u0435\u043d\u0438\u0435&nbsp;<strong>_sand = 100;<\/strong><\/li><li>\u0432\u044b\u043f\u043e\u043b\u043d\u044f\u0435\u0442 \u0446\u0438\u043a\u043b&nbsp;<strong>while(_sand &gt; 0)<\/strong><\/li><li>\u043d\u0430 \u043a\u0430\u0436\u0434\u043e\u0439 \u0438\u0442\u0435\u0440\u0430\u0446\u0438\u0438 \u0446\u0438\u043a\u043b\u0430 \u043f\u0440\u043e\u0438\u0441\u0445\u043e\u0434\u0438\u0442 \u0443\u043c\u0435\u043d\u044c\u0448\u0435\u043d\u0438\u0435 \u0437\u043d\u0430\u0447\u0435\u043d\u0438\u044f&nbsp;<strong>_sand<\/strong>&nbsp;\u043d\u0430 \u0435\u0434\u0438\u043d\u0438\u0446\u0443 \u0438 \u0437\u0430\u0434\u0435\u0440\u0436\u043a\u0430 \u0432 100 \u043c\u0438\u043b\u043b\u0438\u0441\u0435\u043a\u0443\u043d\u0434:<br><strong>_sand&#8211;;<br>await new Future.delayed(const Duration(milliseconds: 100));<\/strong><\/li><\/ul><\/li><\/ol>\n\n\n\n<p class=\"wp-block-paragraph\">\u041d\u0430 \u0441\u043a\u0440\u0438\u043d\u0448\u043e\u0442\u0435 \u0432\u044b\u0432\u043e\u0434\u0430 \u043a\u043e\u043d\u0441\u043e\u043b\u0438, \u043c\u043e\u0436\u043d\u043e \u0443\u0432\u0438\u0434\u0435\u0442\u044c \u0440\u0435\u0437\u0443\u043b\u044c\u0442\u0430\u0442\u044b \u043f\u0430\u0440\u0430\u043b\u043b\u0435\u043b\u044c\u043d\u043e\u0439 \u0440\u0430\u0431\u043e\u0442\u044b \u0430\u0441\u0438\u043d\u0445\u0440\u043e\u043d\u043d\u044b\u0445 \u043c\u0435\u0442\u043e\u0434\u043e\u0432 \u0438 \u043e\u0441\u043d\u043e\u0432\u043d\u043e\u0433\u043e \u043f\u043e\u0442\u043e\u043a\u0430.<\/p>\n\n\n\n<figure class=\"wp-block-image\"><a href=\"https:\/\/flutter.su\/data\/e0c80522887d6ac4ebe0e275f39d0341.png\" target=\"_blank\" rel=\"noopener\"><img decoding=\"async\" src=\"https:\/\/flutter.su\/data\/e0c80522887d6ac4ebe0e275f39d0341.png?w=500\" alt=\"\u041d\u0430 \u0441\u043a\u0440\u0438\u043d\u0448\u043e\u0442\u0435 \u0432\u044b\u0432\u043e\u0434\u0430 \u043a\u043e\u043d\u0441\u043e\u043b\u0438, \u043c\u043e\u0436\u043d\u043e \u0443\u0432\u0438\u0434\u0435\u0442\u044c \u0440\u0435\u0437\u0443\u043b\u044c\u0442\u0430\u0442\u044b \u043f\u0430\u0440\u0430\u043b\u043b\u0435\u043b\u044c\u043d\u043e\u0439 \u0440\u0430\u0431\u043e\u0442\u044b \u0430\u0441\u0438\u043d\u0445\u0440\u043e\u043d\u043d\u044b\u0445 \u043c\u0435\u0442\u043e\u0434\u043e\u0432 \u0438 \u043e\u0441\u043d\u043e\u0432\u043d\u043e\u0433\u043e \u043f\u043e\u0442\u043e\u043a\u0430.\"\/><\/a><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">\u0410\u0441\u0438\u043d\u0445\u0440\u043e\u043d\u043d\u044b\u0435 \u043c\u0435\u0442\u043e\u0434\u044b \u0437\u0430\u043d\u0438\u043c\u0430\u044e\u0442 \u0432\u0430\u0436\u043d\u043e\u0435 \u043c\u0435\u0441\u0442\u043e \u0432 Dart \u0438 Flutter, \u0432 \u0441\u043b\u0435\u0434\u0443\u044e\u0449\u0435\u043c \u0443\u0440\u043e\u043a\u0435 \u043c\u044b \u0440\u0430\u0441\u0441\u043c\u043e\u0442\u0440\u0438\u043c http \u0437\u0430\u043f\u0440\u043e\u0441\u044b.<\/p>\n\n\n\n<figure class=\"wp-block-image\"><a href=\"https:\/\/flutter.su\/data\/61ed3556b4802dd06296c383031ddbdf.gif\" target=\"_blank\" rel=\"noopener\"><img decoding=\"async\" src=\"https:\/\/flutter.su\/data\/61ed3556b4802dd06296c383031ddbdf.gif?w=350\" alt=\"\u0414\u0435\u043c\u043e\u043d\u0441\u0442\u0440\u0430\u0446\u0438\u044f \u0440\u0430\u0431\u043e\u0442\u044b \u043f\u0440\u0438\u043b\u043e\u0436\u0435\u043d\u0438\u044f \u0441 \u0430\u0441\u0438\u043d\u0445\u0440\u043e\u043d\u043d\u044b\u043c \u043c\u0435\u0442\u043e\u0434\u043e\u043c\"\/><\/a><\/figure>\n","protected":false},"excerpt":{"rendered":"<p>\u041f\u0440\u043e\u0433\u0440\u0430\u043c\u043c\u0438\u0440\u0443\u044f \u043d\u0430 Flutter 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