Skip to main content

Switching Between View Controllers Efficiently

Image
By User



In order to switch between views in my iOS app, I have been using Modal View Controllers. It works fine, but is this bad coding practice? Will it be detrimental to the memory usage of my app?





In response to comments asking for more information, the views I am switching between are normal informational views. I am using three views to navigate through my app:





  • Main View: Has buttons to navigate to specific informational views



  • Info View: Has buttons to navigate to specific web pages for information



  • Web View: Displays information through a UIWebview







I have an improvised navigation bar at the top for navigating "back" and "home" do the main page.





Overall, this is a web app with structure provided with menus in other views. I don't want to reveal what it does specifically (it's my idea), however this should be enough information to work with.





I am currently switching between views like this:







newViewController *newView = [[newViewController alloc] init];

[self presentModalViewController:newView animated:YES];







Based on the answers so far, Modal Views are meant to quickly and temporarily display animations, but I am looking for a more permanent approach.





Is there a better way? Please provide example code with your response. Thank you!





EDIT: I apologize for originally not having enough information. I have posted a lot more information. If you need anything else, please comment.


Labels:

Comments

  1. Tips For AllJanuary 20, 2012 at 7:16 AM

    Using modal view controllers is usually reserved for times when you need to display a view temporarily, as when the 'new message' controller is presented by Apple's Messages app. Another way to do what you want, which requires a little more setup, is:

    [self.navigationController pushViewController:newView animated:YES];


    A nice explanation outlining the difference between the two can be found here as well as questions on Stack Overflow here and here. A nice little tutorial on how to set up a UINavigationController can be found here, and a previous SO question here covers the topic of custom animations, while some source code provided here might also help you out. Phew. That's a lot of links.

    ReplyDelete
  2. Tips For AllJanuary 20, 2012 at 7:16 AM

    Modal view controllers have a definite purpose of acquiring 'extra information' in a program flow. They are not designed to consume more/less memory. In fact no particular style of view controller is designed with memory consumption in mind. If you are gathering hierarchical bits of information, UINavigationController coupled with UITableViewController might be the way to go. Likewise, if you need a piece of information (and, say, you can't proceed without getting this information) you present a modal view controller (sort of) alerting the user.

    ReplyDelete

Post a Comment

Popular posts from this blog

Why is this Javascript much *slower* than its jQuery equivalent?

By User
I have a HTML list of about 500 items and a "filter" box above it. I started by using jQuery to filter the list when I typed a letter (timing code added later): $('#filter').keyup( function() { var jqStart = (new Date).getTime(); var search = $(this).val().toLowerCase(); var $list = $('ul.ablist > li'); $list.each( function() { if ( $(this).text().toLowerCase().indexOf(search) === -1 ) $(this).hide(); else $(this).show(); } ); console.log('Time: ' + ((new Date).getTime() - jqStart)); } ); However, there was a couple of seconds delay after typing each letter (particularly the first letter). So I thought it may be slightly quicker if I used plain Javascript (I read recently that jQuery's each function is particularly slow). Here's my JS equivalent: document.getElementById('filter').addEventListener( 'keyup', function () { var jsStart = (new Date).getTime()...
3 comments
Read more

Is it possible to have IF statement in an Echo statement in PHP

By User
Thanks in advance. I did look at the other questions/answers that were similar and didn't find exactly what I was looking for. I'm trying to do this, am I on the right path? echo " <div id='tabs-".$match."'> <textarea id='".$match."' name='".$match."'>". if ($COLUMN_NAME === $match) { echo $FIELD_WITH_COLUMN_NAME; } else { } ."</textarea> <script type='text/javascript'> CKEDITOR.replace( '".$match."' ); </script> </div>"; I am getting the following error message in the browser: Parse error: syntax error, unexpected T_IF Please let me know if this is the right way to go about nesting an IF statement inside an echo. Thank you.
5 comments
Read more