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.
Related
below i attached an app help guide screen. I am understanding how to build this screen.
If any body have idea please share here
View with semi transparent background color (backgroundColor:"rgba(0,0,0,0.5)";) and some images on top of it.
So, using images is bad. You'll need images for translations and if you do this as one image you'll need to ensure all devices are covered so your arrows point to the right element.
Minimise images == smaller app.
First thing you'll need to do is a create a blocker view -- so that's a view that will fill the screen and have a black background with opacity.
You can't apply that to the window as everything in it will be semi-transparent so:
Create a transparent Window that fills the screen.
Add to that window a view that fills the window and has opacity say 0.5 and black background
Add to the Window (not the view you just created) the other elements and button -- ideally, these should be individual graphics of the arrows, sized in such a way that you can position them based on the host element (the item they are pointing to / referring to). Use real text so you can handle translations / reduce file size.
So you'll need a way to associate each tip with a control they are anchored too, and that will ensure that regardless of the screen size, the tip will appear in the correct place.
First of all, always give a try before putting questions anywhere because it makes you learn things on your own for long time.
The easiest step for you to do this is to ask your designer to create a complete image just like that & you just have to show it on top.
If you have to show that image in different translations, then you can ask your designer to provide you required translations images.
I have a problem that nobody has yet offered any help with so let me ask a technical question to help me diagnose it on my own.
What mechanisms does the system have for moving a view so it appears to be partly off screen besides changing the view's frame (i.e. bounds/center) or transform?
This is an app which needs to run on iOS 5/6 still so I'm not using auto layout.
I have a fullscreen view reached via a push segue.
After a pause I hide the (translucent) status and navigation bars.
When the bars hide with animation they slide up off the screen.
In iOS 5/6 this just exposes the top of the view (which is an image). In iOS 7 it moves the entire view up "offscreen" a corresponding amount (i.e. 64 points if I hide both bars) showing a bar of content "below" the view at the bottom of the screen.
When I un-hide the bars (via a tap) the bars appear and the view moves back down to occupy the whole screen.
Whether the VC is set to extend the view under bars or not doesn't affect the behavior.
I have not been able to reproduce this behavior in a simplified app.
In either state, i.e. partly offscreen or fully onscreen, the top-level view frame remains {0, 0} 320 x 480 and the transform matrix remains {1, 0, 0, 1, 0, 0}. I have no idea what property of what object the system is changing to visually move the view. Perhaps if I knew what object/properties to examine I could deduce something about what is going on. Can anybody tell me how the system might be doing this?
The answer is that the "view" that was being moved was being presented by a UIPageViewController and I wasn't thinking about that. The UIPageViewController is presenting the child views inside a UIScrollView (subclass, I think) and so the scroll insets for the containing UIScrollView were being changed by iOS 7. Since the whole "presenting as a child" thing actually works -- of course I couldn't see the problem in the child view.
The "fix" was to un-check the View Controller setting for Adjust Scroll View Insets for the UIPageViewController view.
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.
I'm trying to make an animation effect similar to the one on Safari(iPhone) when you add an element to the reading list. It's similar to the one that appears when starting to download an item from App Store application: the application item drops to the dock to start downloading.
First it bounces up and then goes to the dock. It's a very nice effect that Apple uses on their OS.
I have an image view on screen that I want to drop with this kind of animation to my toolbar in my application.
If there is someone who did it or know what's the name of the effect, could please tell me how to do it.
Thank you.
"Add to reading list" shows no animation on my phone but of your description it sounds like the "Open in background"-animation in Safari (iPhone). My answer describes that animation.
I wrote a thing like that a few months ago and much of it is doable while some of it is not. Your questions showed me that more people are to know how it is done so I wrote a blog post about it. I will describe the high level approach and challenges here but you can read more about it in that post.
Getting to content to animate
If you choose to animate the view that is on screen down to the (in your case) tool bar then you will only have to access its layer. If you want the original view to remain and animate a visual copy (like the "open in background"-Safari animation) down to the bar item then you should create a new layer and draw the content of your layer into an image and set that image as the content of the layer that you are animating
Calculating the end position
The start position of the animation is simply the frame of the view. The end position is very tricky since bar items (both tool bar items and tab bar items) are not UIView subclasses and doesn't have a public view property. This causes problems when you want to shake the bar item later on.
I decided to make a visual approximation of the end position using some simple heuristics. If you know before hand that you will only animate to a single bar item then the end position can be hard coded to a suitable frame.
Animating along a path
There is nothing special to moving, scaling and rotating the layer from the start to the end position. If you want to read more about how I did it you can look at the post I wrote.
Shaking the bar item
This cannot be done without a lot of custom code or using private API at the moment. Since bar items doesn't have a view or a layer there is no accessible layer for you to animate. I guess that you could have a custom animating image that does the shake and set that during the animation and set the new image afterwards. The approach of drawing into an image and animating that doesn't work that well either since there is no accessible layer who can draw its content into the image (you want this for the special effect of the tool bar item and tab bar item).
...put all this together and tweak it to your special needs and you will have an animation that resembles the animation you are looking for.
I want to create a simple application which performs some calculations and then draws some images on view. I use NSBezierPath. Then I must resize the view and allow people scroll the finished picture. But i don't know how.If I also try to draw an image on an invisible part of canvas then it becomes invisible or isn't drawn (I couldn't know the future canvas size).
Check out the Apple sample code called BezierPathLab. I think that will get you started. There's lot of other sample code for Quartz 2D drawing too.
Being able to scroll and resize the view should be as simple as putting the view that you will be using to draw inside an NSScrollView.