automatic ref counting - iOS: destroy subviews in viewDidDisappear? -

-

i have uinavigationcontroller uiviewcontroller pushed onto it. in viewcontrollers view, have 2 subview uiscrollviews. recreate these scrollviews every time in viewwillappear method in viewcontroller , add them subviews viewcontroller's view. using arc, should destroying 2 scroll views in viewdiddisappear method? better practice memory usage.

edit: did investigation, , without removing scroll views , setting them nil in viewdiddisappear method, not released. viewcontroller's view gets increasing number of subviews viewwillappear called. mentioned in comments, never deallocate main viewcontroller. stays on navigation controller's stack. why must manually release scroll views?

it may not necessary @ all. if uiviewcontroller removed screen , being deallocated, automatically deallocate view hierarchy (including subviews have added). easy way check override dealloc methods of classes you're interested in (using objc category method added class), , log message indicate they've been removed.


Comments

Post a Comment

Popular posts from this blog

java - How to Configure JAXRS and Spring With Annotations -

-
i working on little spring web service project. here example route: package com.example.api; import javax.ws.rs.get; import javax.ws.rs.path; import javax.ws.rs.produces; import javax.ws.rs.pathparam; import javax.ws.rs.ext.provider; import javax.ws.rs.core.mediatype; @provider public class webserviceroutes { @get @path("/hello") public string health() { return "hello"; } } then in spring configuration class: package com.example.api; import org.springframework.context.annotation.bean; import org.springframework.context.annotation.configuration; @configuration public class springcontextconfiguration { @bean( destroymethod = "shutdown" ) public springbus cxf() { return new springbus(); } @bean public webserviceroutes webserviceroutes() { return new webserviceroutes(); } } and in web.xml: <?xml version="1.0" encoding="utf-8"?> <web-app version=...
Read more

visual studio - TFS will not accept changes I've made to a Java project -

-
i using tfs's team explorer manage visual studio projects. recently, i've created new java project (not in visual studio) manually added tfs using source control control explorer in visual studio. after added java project tfs, made changes , bug fixes. then, went visual studio , opened source control explorer check in changes, tfs thinks no changes made. it seems needed check out project before making changes. guess erroneously expected tfs track automatically, okay. so, using source control explorer in tfs, checked out project, , tried check in pending changes. when tried check in, got following message: all of changes either unmodified files or locks. changes have been undone server. is there way convince server indeed project has changed? how can check in changes have made? thank help.
Read more

php - Create image in codeigniter on the fly -

-
i want create image in codeigniter in simple php using gd functions. have tried following method in controller function image(){ $my_img = imagecreate( 200, 80 ); $background = imagecolorallocate( $my_img, 0, 0, 255 ); $text_colour = imagecolorallocate( $my_img, 255, 255, 0 ); $line_colour = imagecolorallocate( $my_img, 128, 255, 0 ); imagestring( $my_img, 4, 30, 25, "thesitewizard.com", $text_colour ); imagesetthickness ( $my_img, 5 ); imageline( $my_img, 30, 45, 165, 45, $line_colour ); //$this->output->set_content_type('image/png'); header( "content-type: image/png" ); imagepng( $my_img ); imagecolordeallocate( $line_color ); imagecolordeallocate( $text_color ); imagecolordeallocate( $background ); imagedestroy( $my_img ); } if write code in simple php can see in url http://www.domain.com/image.php if run in codeignite...
Read more