I'm using a webview to display a PDF.
The webview displays the PDF at it's actual size which is a little smaller than the size of the webvieww itself, revealing the scroll view underneath it.
I've tried setting the Webview to opaque and setting it's background color to another color, which works fine and dandy in the simulator, but fails to change the color on the device. On the device it changes the color of the background of the view behind the scroll view, this can be seen when the PDF is pulled all the way down.
I've also tried setting all the UIView's backgrounds, by iterating through the subviews but to no avail.
I've updated a diagram to help illustrate which area I'd like to color.
Uploaded Diagram
You really shouldn't mess around with UIWebView's internals.
They can change anytime and your code might just crash on the next version of iOS.
If you need more control about pdf display, you might wanna take a look at other possibilities to show pdf, like using the CGPDFDrawPage* functions. Of course they are pretty low-level and it's a lot of work required until you can get fast page display, zooming, etc all right.
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I am very unexperienced and rather new to Objective-C and I'd like to ask a methodical question. What I want to do is:
Load a user provided image to show on the screen. The user should be
able to zoom. So it seems best for me to use a NSScrollView to draw
the image. I have some other demands about the behavior
When the image is loaded, it should fit the NSScrollView without
being stretched in either direction.
When the user now changes the size of the NSScrollView (via changing
the size of the window) the image should be resized appropriately.
If the user at some point zooms the image, it shall not be resized
when changing the size of the NSScrollView. If the image is zoomed
to fit into the NSScrollView (means like when loaded) it should be
resized again when changing the size of the NSScrollView. I think
this is the same behavior as in Apple's preview app.
I guess this is easy to achieve for an experienced programmer, but I have some issues. Here's what I have tried.
I load the image via
[[NSImage alloc] initWithContentsOfFile:imagePathStr];
on a button click. I am also able that it is displayed to fit nicely (on load) into the NSScrollView by changing the size of the image before drawing it. But I can't get the behavior right on resizing or zoom (I use the NSScrollView biuld-in zoom ability). Can someone provide some kind of list of key points that needed to be executed to achieve what I want? Or do someone rather see my explicit code to tell me what I am doing wrong?
I'm trying to make a page based application in iOS where the actual page is a non-rectangular image (contains clear color). However, the shadow that appears when I turn the page doesn't seem to ignore the transparency of the image (see below).
Screenshot http://img543.imageshack.us/img543/9730/pagecurl.png
Does anyone know if it's possible to modify this behavior?
Thanks in advance.
Have you tried setting your UIPageViewController's view's frame so that it sits just within the border defined by your custom page image?
(So in your case, the largest rectangle that fits inside your white page image)
The way UIPageViewController handles a page curl animation with views that extend beyond its own view's frame can be thought of as follows:
Think of the overhang as rigid. it does not bend like the rest of the page, but it does maintain the angle at the edge of the UIPageViewController's frame. If the overhang (i.e. parts of your image or view that extend beyond the UIPageViewController's frame), is small, the fact that the overhang animates as rigid (instead of the bendy, flexible page) is visually negligible.
However, without any further modifications, the pages will only flip when a touch is started INSIDE the UIPageViewController's view's frame. But it would be better if it could react to touches anywhere on your white page image. If you want the pages to react to touches inside another view's frame (e.g. the view holding your white page image), try the following:
otherView.gestureRecognizers = myPageViewController.gestureRecognizers;
The problem is that the iOS framework puts a shadow over the entire bounds of the view controller you specify for the page, so any transparent areas will look shadowed. You could try masking your view controller (viewController.view.layer.mask and viewController.view.layer.masksToBounds) and see if that helps.
Hopefully Apple improves this framework for a future iOS release. It sure would be nice to disable that shadow or have a way to do it yourself but there you go.
I'm drawing some custom shapes behind a textview to make it appear it's a notepad. It draws a repeating bitmap across the top, as well as a white background under the text, and a secondary "note" page under the rest to add a little dimension and layering. See the screenshot:
Now, this is with setDrawingCacheEnabled(true) for the TextView this drawable is applied to. With this method call applied, the scrolling is VERY smooth, exactly what I want. Without it, the black background disappears, but the scrolling is very choppy. Any idea on how to cache this view so that scrolling is smooth without destroying my UI?
Seems this function only works with solid colors, as defined in the documentation which I should have read before posting. I find it hard to believe there's nothing that caches complex views and drawables to work as well as that function does, but, whatevs. Live 'n learn.
I am trying to implement a control to edit text that will display the text in multiple colors. None of the solutions I have attempted yet have been good enough.
UITextView cannot accomplish this. All of the text must be the same color.
Using CoreGraphics to draw the text does not allow the text to be selected.
Using a UIWebView, DIV and PRE tags cannot be set to contentEditable on Mobile Safari.
Currently playing with using an off-screen TEXTAREA and an on-screen DIV to show the rendered text. This works pretty well, except supporting all of these at the same time seems impossible: click-to-type, click-to-move-cursor, click-and-hold-select/copy/paste.
Anyone have any tips on this predicament?
I've been trying to find any preexisting library out there that will accomplish this in a good way, to no luck. I'm open to any ideas!
Well, just pulling an idea out of my... let's say hat.
Could you put a transparent UITextfield over a view that draws the text? If the background was clear and the text color was clear the user could not perceive it but it should still respond to all commands. As the user enters and edits text you could draw the results on the view underneath.
I think the selection would work without any modification at all. When the user selected the clear text, it should create the illusion of selecting the drawn text automatically.
Like this one? StyledText http://three20.info/gfx/overview/styledtext.png It's in Three20 .
Here is an idea. I have no idea if it would work.
If you are only using colors, and not styles, the a UIWebView with colored text might layout text in exactly the same way as a UITextView. You could put a UITextView with invisible ink (text and background fully transparent) over a UIWebView and mirror the contents with colors in the html. I assume you can do scrolling with javascript along with the colored layout.
We are using a UITextView with a dark background. As such we have made the text white color in order to be easier to read. The problem is the magnify window that pops up when you hold down your finger to move the insertion point uses white for the text color as well. This makes it impossible to see exactly where the insertion point is.
Is it possible to independently control the text color used in the magnify window?
Here is a screen shot illustrating the problem.
I just did a quick test in here and it's working fine.
I tested with firmware 2.2.1, in the simulator and using a device.
This is what I did to test it:
1- Created a new View-Based project
2- edited the nib in the Interface Builder, added a UITextView, setting the text to white and the background to gray, leaving everything else default
Do you have something different?
Hmm, it works correctly in the Notes app. Not only is the background yellow, you also see the lines.
Maybe it depends on whether you set the background color directly on the UITextView or make it transparent and set the background color of its containing view?
I don't think you have any control over that. And I think you should file a bug report with Apple over that. It should be smarter than that.