I am currently using QLPreviewController to view PDFs (250MB+) However it cannot deal with real large files. Either I get the info that not the whole file has been loaded or the whole app just dies.
I also need to customize the view which is nit possible using QLPreviewController.
What should I do? Use UIWebView instead? Or will I have to use CGContextDrawPDFPage?
Using the latter, how will I get zooming implemented?
I would go with your suggestion of using a UIWebView. Doing so will automatically give you zoom support and the UIWebView should handle loading extremely large PDF's.
If you have decided to go with Quartz, this link looks very promising for zoom support.
Related
I have a huge map image (25mb) that I want to use in my app. The entire point of the app is to pinch zoom and scroll around this richly detailed map.
I am loading it in a uiimageview, with some subview layers that can be toggled on and off to overlay the map.
Everything is working fine code wise and on my simulator, but my concern is that the actual iPhone/iPad may have problems rendering/manipulating a 25mb png image.
Anyone have experience with huge image files in Xcode? Any recommendations or concerns about what I have described?
Someone suggested using uiwebview to display the image. I'm not sure why thy would be any better.
Thanks
Best way to handle very large images is to chop them into easily manageable square chunks and load them dynamically. Here you can see a very nice tutorial for a tiled UIScrollView. Modding the code a bit will surely suit your needs.
Check out the ADC Videos, specifically WWDC 2010 Session 104 "Designing Apps With Scroll Views". This shows how to use CATiledLayer.
I'm developing an application. It consists of notes and images also. I'm unable to find the best way of coding to add images and text together.
I want to add the images between the textview and after that, the text has to continue. Is it possible to do like this?
You will probably be better to use a webview and load in some static html from the application unless you particularly need textviews, in which case look at holding things in UITableView
I am looking to replicate the image gallery view that shows thumbnails, like in the photos app on the iPhone.
Is there a view controller or any examples that anyone can provide to replicate this?
There isn't one provided by Apple. I would recommend looking at Three20. It has a few things with look a lot like the Photos app.
Another option is AQGridView.
Take a look at the video of Session 104 from the WWDC 2010. It's basically a 40 minute tutorial on how to do the photo app.
Bear in mind that allowing users to zoom will greatly increase the space required. If you use CATiledLayers, that is, which, depending on your desired zoom level, you should consider doing.
Oh, and there is source code ;)
What they don't tell you is how they did their tiling. I found that you can
a) download ready-made tiles from the server with the app or with a content update (you can use ImageMagick's crop tileWidthXtileHeight - e.g. crop 100x100 - to do the tiling). This has the disadvantage of large downloads.
b) download ready-made tiles from the server as needed (may lead to lags in your app, but then MKMapView does it quite nicely, doesn't it?)
c) tile on the phone as needed (here you can also consider caching the results, although that will likely mean you have to check space left on the device)
I've recently given enormego's PhotoViewer a try. It's easy to use, and it's much more focused than the Three20 project. (Which I also use and like a lot.)
how load a pdf into iphone and my pdf is of 200 pages then it should allow to turn the pages as we do with while reading book manually means use animation to turn a page one by one ..
Thanking you ..
Loading a large PDF and having page flipping animation isn't very simple. You can use a UIWebView like #Jim says to load the entire thing by just pointing the UIWebView's URL to the PDF but you won't get page animation. However to get full control requires that you render the PDF page by page manually to a view, and create the view's turning animation your self. Its nontrivial, and given your question you don't sound like you know enough to realistically achieve this right off.
Use UIWebView Control to load pdf files.
I have a bunch of texts and images (taken from the content tag of a RSS feed item) that I want to display in my app. I've managed to extract them from the entire content tag with some regular expressions. But the thing is, in order for the texts to appear before all the images are loaded, I need to preload all the images, and even more, I need to reposition all the texts/images when an image is loaded, because I don't know their size at first, to position the element under them correctly.
I realized this is too much hard-work for such a simple task.
I searched for some simple HTML wrapper but I found nothing. And than I realized: hey, I can insert HTML directly into an UIWebView. But then again, I see UIWebView more like an iFrame in HTML, and by that I mean not a very flexible/fluid element. The content will be bigger than the iPhone screen height, can the UIWebView adjust to fit it's contents? I don't want the browser zoom features and all, but rather to blend in the page.
So bottom line: In order to display a bunch of texts combined with images, should I continue with my initial pain-in-the-ass method, should I use a UIWebView, or is there another simple element like the one in my dreams? :)
Thanks.
Definitely use the web view; it has hundreds of person-years of work behind it, and is realistically impossible for you to reproduce by yourself. To keep it from zooming, you can add a viewport meta tag to your HTML fragment.
...[S]hould I continue with my initial pain-in-the-ass method, should I use a UIWebView, or is there another simple element like the one in my dreams...
I'm not entirely sure what you have against UIWebView, it's a decent and fairly complex element that can support many behaviors. One of the extremely attractive properties of IB and Cocoa development is that prototyping is very quick. I think you should spend half an hour and play around with the component. Writing your own code is definitely an option, but layout engines (ie WebKit in UIWebView/Safari, or Gecko in Firefox) is a complicated task. Why reinvent the wheel?
HTH.