ios - Determine if a cell in on screen and perform a function -


i want find out if cell displaying onscreen in table view.

i tried out willdisplay method it's of no use. tried 

if (tableview.indexpathsforvisiblerows?.contains(indexpath))! {                     print("showing now") }


function works, doesn't print when cell on screen or scroll down. ex: if have 5 cells, app launches , cell on display, nothing printed. also, when scroll cells 1 5, nothing displayed. on contrary, if scroll cells 5 1, display it, defies purpose.

i hope understood query , can me apt solution.

cheers!

willdisplay method of tabview should work you.

give datasource , delegate properly. control+drag tableview yellow icon display correct options.

enter image description here

add extension viewcontrollerclass , confirm table protocols-:

extension viewcontroller : uitableviewdelegate,uitableviewdatasource{      func numberofsections(in tableview: uitableview) -> int {         return 1     }// default 1 if not implemented      func tableview(_ tableview: uitableview, numberofrowsinsection section: int) -> int{         return 2     }       func tableview(_ tableview: uitableview, cellforrowat indexpath: indexpath) -> uitableviewcell{         let cell = tableview.dequeuereusablecell(withidentifier: "cell")         cell?.textlabel?.text = indexpath.row         return cell!     }      // display prints while displaying cells      func tableview(_ tableview: uitableview, willdisplay cell: uitableviewcell, forrowat indexpath: indexpath) {         print("visible now")     }

Comments

Post a Comment

Popular posts from this blog

ubuntu - PHP script to find files of certain extensions in a directory, returns populated array when run in browser, but empty array when run from terminal -

i running os ububtu 16.04. ultimate goal able run php script cron job every minute. here php script located @ /var/www/html/tests/test/index.php : <?php $directorypath = $_server['document_root']."/tests/test/data/"; echo "directorypath: $directorypath<br><br>";//check $imagefilepathsarray = glob($directorypath . "*.{png,gif}", glob_brace); echo "<br><br>imagefilepathsarray: "; print_r($imagefilepathsarray);//check ?> when open php script in browser visiting url my-ip-address/tests/test/index.php , get: directorypath: /var/www/html/tests/test/data/ imagefilepathsarray:array( [0] => /var/www/html/tests/test/data/pic.png [1] => /var/www/html/tests/test/data/pic.gif ) before writing cron job in crontab file, need check if can run anywhere using terminal . opened ubuntu terminal @ /home/ location, , executed in terminal: sudo php /var/www/html/tests/test/index.php i got following out...
Read more

php - How can i create a user dashboard -

today have questions you, want create user dashboard site, include (obviously), users data, example -email -username -and others stuff how can information, , print them in html page? if can, how can these information via php sessions? shuld use session? example, if user login, , start new session ( session_start() ), how can data print in dashboard? should use php "project"? in advice, have day , thank time!
Read more

javascript - How to detect toggling of the fullscreen-toolbar in jQuery Mobile? -

i have jquery mobile page fixed full-screen toolbar, data-tap-toggle enabled. straight under toolbar have positioned banner should slide upwards when toolbar hiding , slide downward when toolbar showing. jquery mobile toggles toolbar applying , removing ui-fixed-hidden class - sadly, can't find in documentation of toolbar widget toggle , hide or show event that. how can detect when toolbar toggled, reposition banner? .banner { position: fixed; background-color: darkseagreen; top: 46px; min-height: 48px; width: 100%; text-align: center; line-height: 48px; } <!doctype html> <html> <head> <meta charset="utf-8"> <meta name="viewport" content="width=device-width, initial-scale=1, user-scalable=no"> <link rel="stylesheet" href="https://code.jquery.com/mobile/1.4.5/jquery.mobile-1.4.5.css"> <script src="https://code.jquery.com/jquery-1....
Read more