I want to view a local PDF (in my iPhone app) and be able to jump to a specific page. Seems like the UIWebView is the way to go, however, I can't find any information on jumping to specific pages. Is this impossible? Are there any other techniques I can use?
thanks,
Howie
You can try using Javascript. See this link for more details. You'll want to use something along the lines of #"window.scrollTo(0, x);", where x is some value you determined by playing around with the WebView.
Another option would be to set the content offset of the UIWebView like Mike pointed out (but without involving JavaScript):
webView.ScrollView.SetContentOffset(new PointF(0, y), true);
(sorry for the MonoTouch code but ObjectiveC is still on my todo list)
Alternatively to an UIWebView, you can use the Quartz API :http://developer.apple.com/iphone/library/documentation/GraphicsImaging/Conceptual/drawingwithquartz2d/dq_pdf/dq_pdf.html
It's more complicated, but you should be able to do whatever you want.
Related
I'm somewhat hesitant to ask this question because it it is only borderline software development, but I've had zero luck finding what I need anywhere else.
I am building a landing page for an iPhone app and would like to have a video of the app in use that plays inside an image frame of an actual iPhone device (Apple does this on many of their marketing pages). I don't care about the video being played on anything pre-HTML 5, it can be as simple as an mp4.
Are there any tools out there that will easily generate this sort of functionality for me? Given how often I see this sort of thing, I'm surprised that I am having so much trouble finding something that just =gives it to me out of the box.
Alternatively, I am not opposed to coding something myself, so if that's the only option, a suitable answer to this question would be a pointer to some info on the best way to generically overlay an HTML 5 video on top of an image (the iPhone frame).
The reason you probably don't find anything is probably because it's so simple. Put a <video> tag inside a <div> tag, set background-image of the frame, add some padding so the video is centered within the frame, and voila.
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.
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.)
Is there any web-resource (gallery perhaps) showing all user interface elements made from UIView(or other?), so it will give me some quick idea what controls exist, what do they look like?
It's not a web resource per se (depending on what you mean), but you can get the source code for the UICatalog sample from Apple and see what is offered. It's also a good project to look at in case you want to go beyond the look and and actually see how it's implemented.
I'm not sure if this is what you're looking for, but here's a PSD file containing all the iPhone UI elements.
if you use Omnigraffle, there is an iPhone stencil. http://graffletopia.com/stencils/392
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.