{"id":1455,"date":"2012-07-23T18:43:36","date_gmt":"2012-07-23T14:43:36","guid":{"rendered":"https:\/\/blog.alwawee.ru\/?p=1455"},"modified":"2012-07-23T18:50:34","modified_gmt":"2012-07-23T14:50:34","slug":"how-to-generate-random-key-in-ios","status":"publish","type":"post","link":"https:\/\/blog.alwawee.ru\/?p=1455","title":{"rendered":"How to generate random key in iOS"},"content":{"rendered":"<p>It is a common task to generate a random n char string (alphanumeric string). It can be solved the following way. First, we generate an alphabet, that has m chars. Then in a cycle we generate random indexes from 0 to (m-1) and take a char from alphabet with random index. <\/p>\n<pre code=\"ObjC\">\r\n    NSString *alphabet  = @\"abcdefghijklmnopqrstuvwxyz \\\r\nABCDEFGHIJKLMNOPQRSTUVWXZY0123456789\";\r\n    NSMutableString *s = [NSMutableString stringWithCapacity:20];\r\n    for (NSUInteger i = 0U; i < 20; i++) {\r\n        u_int32_t r = arc4random() % [alphabet length];\r\n        unichar c = [alphabet characterAtIndex:r];\r\n        [s appendFormat:@\"%C\", c];\r\n    }\r\n    NSLog(@\"%@\", s);\r\n    NSString *key = s;\r\n<\/pre>\n<p>Inspired by <a href=\"http:\/\/stackoverflow.com\/questions\/2633801\/generate-a-random-alphanumeric-string-in-cocoa\" title=\"http:\/\/stackoverflow.com\/questions\/2633801\/generate-a-random-alphanumeric-string-in-cocoa\" target=\"_blank\">this<\/a> post<\/p>\n","protected":false},"excerpt":{"rendered":"<p>It is a common task to generate a random n char string (alphanumeric string). It can be solved the following way. First, we generate an alphabet, that has m chars. Then in a cycle we generate random indexes from 0 to (m-1) and take a char from alphabet with random index. NSString *alphabet = @&#8221;abcdefghijklmnopqrstuvwxyz [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[3],"tags":[],"class_list":["post-1455","post","type-post","status-publish","format-standard","hentry","category-ios"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.6 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>How to generate random key in iOS - Denis Kutlubaev<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/blog.alwawee.ru\/?p=1455\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"How to generate random key in iOS - Denis Kutlubaev\" \/>\n<meta property=\"og:description\" content=\"It is a common task to generate a random n char string (alphanumeric string). It can be solved the following way. First, we generate an alphabet, that has m chars. Then in a cycle we generate random indexes from 0 to (m-1) and take a char from alphabet with random index. NSString *alphabet = @&quot;abcdefghijklmnopqrstuvwxyz [&hellip;]\" \/>\n<meta property=\"og:url\" content=\"https:\/\/blog.alwawee.ru\/?p=1455\" \/>\n<meta property=\"og:site_name\" content=\"Denis Kutlubaev\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/alwaweemobile\" \/>\n<meta property=\"article:published_time\" content=\"2012-07-23T14:43:36+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2012-07-23T14:50:34+00:00\" \/>\n<meta property=\"og:image\" content=\"http:\/\/blog.alwawee.com\/?attachment_id=1982\" \/>\n<meta name=\"author\" content=\"Denis Kutlubaev\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"Denis Kutlubaev\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/blog.alwawee.ru\\\/?p=1455#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/blog.alwawee.ru\\\/?p=1455\"},\"author\":{\"name\":\"Denis Kutlubaev\",\"@id\":\"https:\\\/\\\/blog.alwawee.ru\\\/#\\\/schema\\\/person\\\/58f1f1f57155b48afab83ba53b3e26a7\"},\"headline\":\"How to generate random key in iOS\",\"datePublished\":\"2012-07-23T14:43:36+00:00\",\"dateModified\":\"2012-07-23T14:50:34+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\\\/\\\/blog.alwawee.ru\\\/?p=1455\"},\"wordCount\":61,\"commentCount\":0,\"articleSection\":[\"iOS\"],\"inLanguage\":\"en-US\",\"potentialAction\":[{\"@type\":\"CommentAction\",\"name\":\"Comment\",\"target\":[\"https:\\\/\\\/blog.alwawee.ru\\\/?p=1455#respond\"]}]},{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/blog.alwawee.ru\\\/?p=1455\",\"url\":\"https:\\\/\\\/blog.alwawee.ru\\\/?p=1455\",\"name\":\"How to generate random key in iOS - Denis Kutlubaev\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/blog.alwawee.ru\\\/#website\"},\"datePublished\":\"2012-07-23T14:43:36+00:00\",\"dateModified\":\"2012-07-23T14:50:34+00:00\",\"author\":{\"@id\":\"https:\\\/\\\/blog.alwawee.ru\\\/#\\\/schema\\\/person\\\/58f1f1f57155b48afab83ba53b3e26a7\"},\"breadcrumb\":{\"@id\":\"https:\\\/\\\/blog.alwawee.ru\\\/?p=1455#breadcrumb\"},\"inLanguage\":\"en-US\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\\\/\\\/blog.alwawee.ru\\\/?p=1455\"]}]},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\\\/\\\/blog.alwawee.ru\\\/?p=1455#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Home\",\"item\":\"https:\\\/\\\/blog.alwawee.ru\\\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"How to generate random key in iOS\"}]},{\"@type\":\"WebSite\",\"@id\":\"https:\\\/\\\/blog.alwawee.ru\\\/#website\",\"url\":\"https:\\\/\\\/blog.alwawee.ru\\\/\",\"name\":\"Denis Kutlubaev\",\"description\":\"iOS Development\",\"potentialAction\":[{\"@type\":\"SearchAction\",\"target\":{\"@type\":\"EntryPoint\",\"urlTemplate\":\"https:\\\/\\\/blog.alwawee.ru\\\/?s={search_term_string}\"},\"query-input\":{\"@type\":\"PropertyValueSpecification\",\"valueRequired\":true,\"valueName\":\"search_term_string\"}}],\"inLanguage\":\"en-US\"},{\"@type\":\"Person\",\"@id\":\"https:\\\/\\\/blog.alwawee.ru\\\/#\\\/schema\\\/person\\\/58f1f1f57155b48afab83ba53b3e26a7\",\"name\":\"Denis Kutlubaev\",\"image\":{\"@type\":\"ImageObject\",\"inLanguage\":\"en-US\",\"@id\":\"https:\\\/\\\/secure.gravatar.com\\\/avatar\\\/346de75d27c818be0aa7fddeada2e50e30cc15b4da6b3b8110c5d766cd2afa34?s=96&d=mm&r=pg\",\"url\":\"https:\\\/\\\/secure.gravatar.com\\\/avatar\\\/346de75d27c818be0aa7fddeada2e50e30cc15b4da6b3b8110c5d766cd2afa34?s=96&d=mm&r=pg\",\"contentUrl\":\"https:\\\/\\\/secure.gravatar.com\\\/avatar\\\/346de75d27c818be0aa7fddeada2e50e30cc15b4da6b3b8110c5d766cd2afa34?s=96&d=mm&r=pg\",\"caption\":\"Denis Kutlubaev\"},\"description\":\"iOS Developer, creator of Tornado Browser and many other popular apps\",\"sameAs\":[\"http:\\\/\\\/dennis.alwawee.com\"],\"url\":\"https:\\\/\\\/blog.alwawee.ru\\\/?author=1\"}]}<\/script>\n<!-- \/ Yoast SEO plugin. -->","yoast_head_json":{"title":"How to generate random key in iOS - Denis Kutlubaev","robots":{"index":"index","follow":"follow","max-snippet":"max-snippet:-1","max-image-preview":"max-image-preview:large","max-video-preview":"max-video-preview:-1"},"canonical":"https:\/\/blog.alwawee.ru\/?p=1455","og_locale":"en_US","og_type":"article","og_title":"How to generate random key in iOS - Denis Kutlubaev","og_description":"It is a common task to generate a random n char string (alphanumeric string). 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