I've got a UIImageView (full frame and rectangular) that i'm rotating with a CGAffineTransform. The UIImage of the UIImageView fills the entire frame. When the image is rotated and drawn the edges appear noticeably jagged. Is there anything I can do to make it look better? It's clearly not being anti-aliased with the background. ...
Hi, I am a newbie. I have a custom UITableViewCell with 3 items: a UILabel a UITextField and a UIButton My question is, how do I know from which cell the button was clicked or textField was edited ? Is there a way to track them? Thanks for any replies. ...
I have a 300 x 400 px PNG-24 with alpha channel. It's about 140kb. I want to mask out some parts of that, so I created another 300 x 400 image as PNG-24 but with only black, gray and white and no alpha channel. The weird thing is: Where the mask is black, the image is just kept original. No transparency. But where the mask is white, the...
Hi there, I have an iphone app with 2 managed object contexts. One of my contexts deals with a picker, which allows the user to add new records and then select one of those new records. Once the picker is hidden, that managed object context is saved and discarded. I then want to use this selected object in my second managed object con...
Hello, i'm building an app that will read rss feeds and will present them in UITableViews. I searched on google and here and ai decided to use LibXML. When my app starts it checkes if it has a valid internet connection, and grabs an rss feed from which i extract some data and i make an uiTabBar with tableViews. after parsing the first ...
Info on this can be found here and there, but is there a definite answer? Does anyone know from experience that his leaking app has approved or that his app was rejected "because it was leaking"? I am close to submitting a game that leaks a very small amount of data (32 bytes at a time), about once or twice a minute. Since the play cycl...
Currently I have an user interface that makes incredible heavy use of core animation. I wonder if it is worth to spent another 2 months for learning openGL ES? Does that really improve drawing performance for 2D surfaces? I have no 3D objects, but highly animated 2D stuff. Sometimes with 3D distortions, a lot of rotations and scaling. I...
I am currently trying to optimize some DSP related code with Shark and found that I am wasting a lot of time in a float to integer conversion: SInt16 nextInt = nextFloat * 32768.0f + 0.5f; As the iPhone seems to have an ARM11 FP co-processor, I am wondering if I can replace my code with the FTOSI instruction. There is some documentati...
Hi everyone, I created little download application with music player and now I want it to unpack archives, because quite often mp3s are packed in archive and you can play them before you unpack the archive. I found solution for .zip files on iPhone here on stackoverflow, but I'm wondering if there's a way to unpack .rar files, or other t...
It seems like a pretty simple problem, but I have been unable to find any good answers. What I'm trying to do is to make some sort of animation while some function is loading. I have already included an animated .gif file in the webapp when waiting for content, but I need the same functionality when navigating in native. For instance, w...
At the end of my UITableViewCell, I have a line of pixel that I cannot remove. The line will change color as the cell is selected. It also changes color according to my selectionStyle. Here is a screenshot demostrating this problem. The cell is created with interface builder. 2 images are set as the background, one for selected, one f...
I have an app with four tabs, each tab will hold a UITableView with parsed XML feed. I'd like to be create a scenario much like the App Store, which has a number of tabs, and some of the NavigationControllers have a SegmentedControl in the top. I'd like to know how it's done? Is there a NavigationController that swaps a view controller ...
I'm using Core Data to store lists of data. So, there's parent objects with any number of child objects. Core Data does a great job keeping my memory use low while I'm inserting objects and reading but when I do a delete operation the memory spikes way up. When I delete a parent object with ~5000 children the cascade delete uses ~10MB. ...
Google returns me just nothing useful on these keywords. But I know there is a "CrashLanding" app demo from apple. Anyone knows where it is? ...
Hello, I´m trying to animate a sort of draggable UIView where the behaviour should be something like this: Drag along the screen following the touch of the user. Detect a swipe touch and drag automatically with an initial speed and a negative acceleration that makes is stop after some time. Something like moving around a photo and th...
Besides CrashLanding, are there any other good example apps with source code? ...
Sometimes I read EAGL, openAL ... wikipedia doesn't tell me something about EAGL. ...
I found this previous question about Cocoa projects, but I wanted to know if it's the same for iPhone projects. ...
Currently I start learning openGL ES, but I wonder what kind of helpful frameworks are out there to get things done faster? ...
I don't know if it's a strange question but how could I run a game made with XNA on the iPhone/iTouch ? Which steps/tools (existing ones or imaginary...) should be used ? note: The goal is to avoid modifying existing C# code UPDATE : If I understand correctly, I must be able to: 1) Run my XNA code on Mono (monoxna or SilverSprit...