ios - how to use drawViewHierarchyInRect -


i want create snapshot image uiview, used use renderinrect, slow, , found drawviewhierarchyinrect newer api since ios 7, want try it.

i write below code, never create valid image, blank image.

-(void)drawrect:(cgrect)rect {     uigraphicsbeginimagecontextwithoptions(_mapview.bounds.size, _mapview.opaque, [[uiscreen mainscreen] scale]);     cgcontextref context = uigraphicsgetcurrentcontext();      // used use renderincontext, it's slow     // [mapview.layer renderincontext:context];      [_mapview drawviewhierarchyinrect:_mapview.bounds afterscreenupdates:yes];     uiimage *image = uigraphicsgetimagefromcurrentimagecontext();     uigraphicsendimagecontext();     self.thumbimageview = [[uiimageview alloc] initwithimage:image];     [self addsubview:self.thumbimageview]; }

the -drawviewhierarchyinrect:afterscreenupdates:, lets render snapshot of complete view hierarchy visible onscreen bitmap context.

renderincontext: renders directly calayer's render tree valid core graphics context.

if want render view uiimage rather having on view hierarchy, should using renderincontext.


Comments

Post a Comment

Popular posts from this blog

How to access a php class file from PHPFox framework into javascript code written in simple HTML file? -

i've website developed using phpfox v3.0.7 . now i'm trying implement 'sse(server sent events)' 1 of php files. reference i'm giving below necessary code part of file. file titled process.class.php , present @ location /var/www/module/notification/include/service/process.class.php present on server having ip http://34.124.40.142/ . <?php /** * [phpfox_header] */ header('content-type: text/event-stream'); header('cache-control: no-cache'); defined('phpfox') or exit('no dice!'); /** * * * @copyright [phpfox_copyright] * @author raymond benc * @package phpfox_service * @version $id: service.class.php 67 2009-01-20 11:32:45z raymond_benc $ */ class notification_service_process extends phpfox_service { /** * class constructor */ public function __construct() { $this->_stable = phpfox::gett('notification'); } public function add($...
Read more

node.js - Using Node without global install -

i'm working on few node & electron (atom shell) projects , i'm curious how them work without user having install node globally. i've seen few applications including node directory in project contains node.exe binary. how go setting node project use binary? edit: thought should add, i've searched everywhere answer this, unrelated results.
Read more

java - JavaScript + Thymeleaf - select onchange -

i have list of objects services in thymeleaf context, , have following @ page: <select id="inputservice" name="idservice" size="1"> <option th:each="service : ${services}" th:text="${service.name}" th:value="${service.idservice}"/> </select> <p id="selectedservicelimits"></p> each object services contains fields minamount , maxamount . how can print p element these 2 fields of selected service in select javascript? , how can print these 2 fields of option selected when document ready? thanks! <script th:inline="javascript"> /*<![cdata[*/ function showlimits() { var services = /*[[${services}]]*/ null; var selectedindex = $("#inputservice option:selected").index(); var service = services[selectedindex]; $("#amountlimits").text("Ми...
Read more