{"id":2406,"date":"2022-08-30T15:24:36","date_gmt":"2022-08-30T15:24:36","guid":{"rendered":"https:\/\/unknownerror.org\/index.php\/2014\/01\/05\/problem-about-viewdidappear-collection-of-common-programming-errors\/"},"modified":"2022-08-30T15:24:36","modified_gmt":"2022-08-30T15:24:36","slug":"problem-about-viewdidappear-collection-of-common-programming-errors","status":"publish","type":"post","link":"https:\/\/unknownerror.org\/index.php\/2022\/08\/30\/problem-about-viewdidappear-collection-of-common-programming-errors\/","title":{"rendered":"problem about viewdidappear-Collection of common programming errors"},"content":{"rendered":"<ul>\n<li>\n<img decoding=\"async\" src=\"http:\/\/www.gravatar.com\/avatar\/73ffcf5ba956abed3bc7aed2bb0f7adf?s=32&amp;d=identicon&amp;r=PG\" \/><br \/>\nuser969043<br \/>\nios viewdidload viewdidappear<br \/>\nSo let&#8217;s see if I can write a clear enough description of my problem&#8230;I&#8217;m developing an application for a museum, where the user can find artworks either through an id or by scanning a qr tag&#8230; Once either an id is entered or a tag scanned, the application sends the user from the search view, to the info view. The info view gathers information about the artwork from an SQLite database&#8230;My problem is, that in the info view, I call the function from the database class as such:- (void)viewDidLoa<\/li>\n<li>\n<img decoding=\"async\" src=\"http:\/\/www.gravatar.com\/avatar\/67aafb7a13bd2db706546b49433bec1b?s=32&amp;d=identicon&amp;r=PG\" \/><br \/>\nJackson<br \/>\ncocoa-touch ios orientation uiinterfaceorientation viewdidappear<br \/>\nI just tracked down a crash I was having in my iOS app and it is related to willAnimateRotationToInterfaceOrientation being called before viewWillAppear.I have an app with two views. Basically, when view1 disappears, I release some arrays, assuming they will be re-initialized when it re-appears in viewWillAppear.However, if I change orientation in view2 then switch back to view1, this causes willAnimateRotationToInterfaceOrientation to happen before view1 has calledviewWillAppear and re-initiali<\/li>\n<li>\n<img decoding=\"async\" src=\"http:\/\/www.gravatar.com\/avatar\/5a30bc36a26af18b7d9b95db19d81286?s=32&amp;d=identicon&amp;r=PG\" \/><br \/>\nPeter Warbo<br \/>\niphone objective-c ios-simulator uiwebviewdelegate viewdidappear<br \/>\nI yet again have a super weird problem. I get different outputs whether I&#8217;m running the application on the simulator or on the iPhone.See these console logs:iPhone First run, first career cell clicked2011-06-23 14:47:28.974 Acando[2033:307] 1 &#8211; loadView method running 2011-06-23 14:47:29.156 Acando[2033:307] 2 &#8211; viewDidLoad method running 2011-06-23 14:47:29.159 Acando[2033:307] 3 &#8211; viewWillAppear method running [Switching to process 12803 thread 0x0] [Switching to process 11523 thread 0x0] 2011<\/li>\n<li>\n<img decoding=\"async\" src=\"http:\/\/www.gravatar.com\/avatar\/0bb02d8c845c0efc333fed5e98b99a6c?s=32&amp;d=identicon&amp;r=PG\" \/><br \/>\nmrueg<br \/>\niphone uitableview scrolling uitableviewcontroller viewdidappear<br \/>\nI have a UITableViewController in my app, which is added to the view hierarchy directly. After the view appears, I want to scroll to a specific cell. My solution would be to call the code for scrolling in -[viewDidAppear].According to Apple&#8217;s docs I have to call the method manually:If the view belonging to a view controller is added to a view hierarchy directly, the view controller will not receive this message. If you insert or add a view to the view hierarchy, and it has a view controller, you<\/li>\n<\/ul>\n<p id=\"rop\"><small>Originally posted 2014-01-05 22:59:49. <\/small><\/p>","protected":false},"excerpt":{"rendered":"<p>user969043 ios viewdidload viewdidappear So let&#8217;s see if I can write a clear enough description of my problem&#8230;I&#8217;m developing an application for a museum, where the user can find artworks either through an id or by scanning a qr tag&#8230; Once either an id is entered or a tag scanned, the application sends the user [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-2406","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"_links":{"self":[{"href":"https:\/\/unknownerror.org\/index.php\/wp-json\/wp\/v2\/posts\/2406","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/unknownerror.org\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/unknownerror.org\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/unknownerror.org\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/unknownerror.org\/index.php\/wp-json\/wp\/v2\/comments?post=2406"}],"version-history":[{"count":0,"href":"https:\/\/unknownerror.org\/index.php\/wp-json\/wp\/v2\/posts\/2406\/revisions"}],"wp:attachment":[{"href":"https:\/\/unknownerror.org\/index.php\/wp-json\/wp\/v2\/media?parent=2406"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/unknownerror.org\/index.php\/wp-json\/wp\/v2\/categories?post=2406"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/unknownerror.org\/index.php\/wp-json\/wp\/v2\/tags?post=2406"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}