I am using Fancybox. In a slideshow where the thumbnails are not reduced from larger images, and are linked to separate full-size images (that will appear in the slideshow when thumbnails are clicked), will the full-size images also pre-load with the webpage? Or only load when the slideshow is activated? My slideshows have many images, and I don't want them to load until necessary. Thanks in advance for advice!
First, you can use developer tools to easily check network activity.
The script fully loads current and previous/next slides after it is activated. Thumbnails are, hoverer, all loaded at once. This means, that if you have extremely large quantities of images, the script will load only max 3 of them and it would be better to disable thumbnails.
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I am looking at the Nimbus photo application example and it seems that it always allows paging for the photo. Is it even possible to turn off paging so I can see 2-3 image in a view instead of one at a time? Also I want to have a loosely scroll (i.e: doesn't snap when I switch between images). How do I do this?
see this demo it is usefull for select multiple photo from library and display it in scrollview with pagging
https://github.com/ForrestShi/UploadPhotoFB
I've made a image gallery with a swipe effect to skip through the uiimageviews.i am using a scrollview to do this.adding all my images in to scrollview using a for loop and am inabling the pagesEnabled=true
myScrollView.pagingEnabled = YES;
but it is taking more time in the case of multiple images.
i have a gallery page and preview page .when ever user clicking the thumb image in gallery page it will navigates to preview page .am doing the looping in preview page's view did load.but it is stucking in gallery page itself and after creating all the images inside scrollview it is showing the preview page.
my question is is there any way to avoid the time delay.??
or there is any way to load all the images after getting inside the preview page(then i can show some loading symbol there insted of stuking and showing the galllery).
There are too many images in the best thing is only to load 3 Images and then to replace the images when you are scrolling to the next. You can check out the Apple WWDC Session 104 for more information about this.
If I understand you correctly, you need to restrict your drawing to only those images currently on the screen. It takes time and memory to draw the images you can't see, and so, the more you add, the slower everything gets, for no benefit. There have been a number of good WWDC presentations on this in the last couple of years. Go to iTunes U (in iTunes) and sign up for the WWDC 2010 and WWDC 2011 videos. Look for ones on implementing scrolling and scrolling performance.
I'm trying to have it so I can add x amount of photos to a Tumblr post and then turn it into a custom image slideshow using jQuery cycle. Is there any way to add x amount of photos to a post and have it spit the images out in a consistent manner? I added 6 and eventually it just points to an iframe that loads their custom slideshow. I don't want to resort to having to edit custom HTML in a post though.
Photosets give you Photo blocks that you can treat like regular Photo blocks. Just had to add those blocks and have it display in an unordered lists.
Docs
Elaborating on that answer... Once you have the photo sets being treated as a list of photos, it would be easy to hookup a jQuery plugin to turn them into a slideshow (try nivo or flex slider)
I have about 20-ish high quality images (~3840x5800 px) that I need to load in a simple gallery type app. The user clicks a button and the next image is loaded into the UIImageView.
I currently use [UIImage imageWithContentsOfFile:] which takes about 6 seconds to load each image in the simulator :(
if I use [UIImage imageNamed:] it takes even longer to load but caches the images which means its quicker if the user wishes to see the same images again. But it may cause memory problems later with all that caching crashing my app.
I want to know whats the best practice for loading these? I'm experimenting with reducing image file size as much as is possible but I really need them to be high quality image for the purpose of the app (zoomable, etc.).
Thanks for any advice
[EDIT]
Hey again guys,
Thanks for all ye're advice. The project's spec's have changed a little. Now as well as displaying the images they firstly have to be zoomed in to a particular spot and when the user taps next it zooms out and then displays the next image. So I'm not sure if the proposed solutions fits?
Apple's docs recommend against trying to load single images that are larger than 1024x1024. You should look into using CATiledLayer instead, to load pieces of the images as needed.
You can have a look at this Apple sample:
http://developer.apple.com/library/ios/#samplecode/PhotoScroller/Introduction/Intro.html#//apple_ref/doc/uid/DTS40010080
It shows how to load big images, breaking them in tiles for different zoom levels.
You can't see all those pixels at any given time, so there is no need to load them all. Load lower-res copies ("big-thumbnails") to view the complete image, then selected sub-tiles, maybe of 2 or more different resolution sets, after the user zooms in.
The CATiledLayer API may be able to handle some of the latter for you.
I'm making a simple rss reader for the iPhone. The feed (http://feeds.feedburner.com/foksuk/gLTI) contains a reference to images that I want to show in my TableView.
By default, as far as I understand, the iPhone only tries to load images when they are needed: it will only load the images for the rows that are displayed. Only when the user scrolls down, it will start loading the ones that need to be displayed. Right?
Now, since the images are downloaded from the web (they are not too large, but still), the scrolling of my TableView is stuttering. This is in the emulator, so on the device itself it will only be worse.
Luckily, this specific feed only lists the latest 12 entries of the blog. So I guess I should be able to first download an cache all the images, so they can be loaded from the memory, rather than from the URL.
What is the proper approach here?
I had the same problem, where my TableView would have to download each image before it displayed the cell. Like you say, it causes a big slowdown in the scrolling speed. What you need to do is download the images in the background and then insert them into the cell when they're finished downloading. This is how the app store app does it.
This post has all you need to know, including a class file you can use straight away:
http://www.markj.net/iphone-asynchronous-table-image/