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• iPhone programming - problem with CoreFoundation forking, PLEASE for the love of god help! lol

  - by Tom

  Hello all, I've been working on an iPhone for several months. It's a 2d shooting game akin to the old Smash TV type games. I'm doing everything alone and it has come out well so far, but now I am getting unpredictable crashes which seem to be related to CoreFoundation forking and not exec()ing, as the message…

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• addSublayer vs addSubView which is more efficient?

  - by soonio

  I have 5 UIImageViews for displaying 5 images. For my app, I need swap the order of them depending on some events. I achieve this by calling: [anImageView1 removeFromSuperview]; [self.view insertSubview:anImageView1 aboveSubview:anImageView2]; Recently, I've come across a different method for doing this using…

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• CALayer and Quartz Transparency

  - by Brian

  I have a CALayer subclass. I have overridden the drawInContext method. I want the majority of my layer to be transparent except a few areas. I'm using the layer as a menu and I want the icons and labels on the menu to be opaque. Is it possible to have a CALayer's sublayers be opaque if the super CALayer is…

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• Apple documentation incorrect about MKMapView -regionThatFits: ?

  - by jtrim

  In the Apple documentation for the -regionThatFits: method of the MKMapView, it says that this will return a new region centered on the same point as the region that's passed in, only with the regions bounds corrected for the iPhone screen aspect ratio. This seems to be incorrect in implementation...before the…

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• Need help with animation on iPhone

  - by Arun Ravindran

  I'm working on an animated clock application for the iPhone, and I have to pivot all the 3 nodes in the view, which I have obtained in the following code: [CATransaction begin]; [CATransaction setValue:(id)kCFBooleanTrue forKey:kCATransactionDisableActions]; clockarm.layer.anchorPoint = CGPointMake(0.0, 0.0);…

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• Render data offscreen in UIView

  - by LK

  How would I go about drawing a view offscreen in order to perform some calculation before the view's draw is actually done? Can this be done by drawing to a temporary layer?

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• EXC_BAD_ACCESS on [error localizedDescription];

  - by david

  This Code trows an EXC_BAD_ACCESS: NSError* error; if(![appdelegate.managedObjectContext countForFetchRequest:request error:&error]) { DLog(@"Failed to save to data store: %@", [error localizedDescription]); NSArray* detailedErrors = [[error userInfo] objectForKey:NSDetailedErrorsKey];…

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• images are getting clipped when Jquery animate opacity is used in IE

  - by Raja

  I use the function given below: function rotate() { //Get the first image var current = ($('div#rotator ul li.show') ? $('div#rotator ul li.show') : $('div#rotator ul li:first')); //Get next image, when it reaches the end, rotate it back to the first image var…

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• plot negative and positive values in same Y-axis in coreplot ios

  - by user3774439

  I have an issue in converting axis labels to int or float values. This is my Y-Axis. It contains temperature values contains -50, 33, 117, 200. CPTXYAxis *y = axisSet.yAxis; y.labelingPolicy = CPTAxisLabelingPolicyNone; y.orthogonalCoordinateDecimal = CPTDecimalFromUnsignedInteger(1);…

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• CLLocationDegrees problem

  - by Daniel

  How do you make a CLLocationDegrees? It's not a float, so what is it?

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• Mystery Key Value Coding Key

  - by Stephen Furlani

  Hello, I'm attempting to load data from an undocumented API (OsiriX). Getting the NSManagedObject like this: NSManagedObject *itemStudy = [[BrowserController databaseOutline] itemAtRow: [[BrowserController databaseOutline] selectedRow]]; works just fine. But getting the NSManagedObject like this:…

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• How to fill a path with gradient in drawRect:?

  - by Derrick

  filling a path with a solid color is easy enough: CGPoint aPoint; for (id pointValue in points) { aPoint = [pointValue CGPointValue]; CGContextAddLineToPoint(context, aPoint.x, aPoint.y); } [[UIColor redColor] setFill]; [[UIColor blackColor] setStroke]; CGContextDrawPath(context,…

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• Odd values/movement with UITouch and CGPoint.

  - by Joshua

  I'm getting odd numbers from UITouch and CGPoint and one is different, I also think this maybe causing a flickering affect in my app when I try to move something by following a touch. This is the code I'm using: - (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event { …

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• Getting notified when a sound is done playing in OpenAL

  - by Mel

  I'm using OpenAL on iPhone to play multiple audio samples simultaneously. Can I get OpenAL to notify me when a single sample is done playing? I'd like to avoid hardcoding the sample length and setting a timer.

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• How do i rotate a CALayer around a diagonal axis?

  - by Mattias Wadman

  Hi, im trying to implement a flip animation to be used in board game like application. The animation is suppose to look like a game piece that rotate and change to the color of its back. I have managed to get a animation that flips around orthogonal axis, but when i try to flip…

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• How to draw an animatable ruler with Quartz2D?

  - by mystify

  I'd like to draw the lines of a simple ruler with Quartz2D, just for practice. Since I have no idea about doing vector graphics programmatically on the iPhone, maybe someone can point me to a good tutorial to get started?

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• iPhone SDK: Panning audio at different levels

  - by Mithin

  Hi! I am trying to control the channel (left/right) and its volume from which the audio file is played. It will be great if someone can explain how this can be done or point me to some document or tutorial which explains this. Thanks a lot!

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• CoreGraphics rounded corner thickness

  - by PCWiz

  Whenever I stroke a path with rounded corners on iPhone, the rounded corners are thicker than the rest of the stroked path. See here for what I mean: Not sure why this happens, any ideas?

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• Drawing triangle/arrow on a line with CGContext

  - by Pete

  Hi, I am using the framework of route-me for working with locations. In this code the path between two markers(points) will be drawn as a line. My Question: "What code should I add if I want to add an arrow in the middle(or top) of the line, so that it points the direction" …

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• Treeset to order elements in descending order

  - by Gaurav Saini

  Here is the piece of code that I have used for Java 5.0 TreeSet<Integer> treeSetObj = new TreeSet<Integer>( Collections.reverseOrder() ) ; Collections.reverseOrder() is used to obtain a comparator in order to reverse the way the elements are stored and iterated.…

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• Forgot the username

  - by prithviraj

  Hello all I have fedora installed in my system. I know the password but i forgot the user name. I can access through terminal but i don't no how to login through gui. Please help me. Thanks in advance.

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• iPhone app crashes on start-up, in stack-trace only messages from built-in frameworks

  - by Aleksejs

  My app some times crashes at start-up. In stack-trace only messages from built-in frameworks. An excerpt from a crash log: OS Version: iPhone OS 3.1.3 (7E18) Report Version: 104 Exception Type: EXC_BAD_ACCESS (SIGBUS) Exception Codes: KERN_PROTECTION_FAILURE at…

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• iPhone UISearchBar animated to top

  - by hurley scott

  There are lots of apps where the searchbar moves upwards if active and moves down when it is inactive. There is a sample code from apple available which works with IB, but how can I achieve this behavior programmatically? Mostly it is combined with a navigationbar which…

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• How to specify selector when CAKeyframeAnimation is finished?

  - by darenchow

  I'm using a CAKeyframeAnimation to animate a view along a CGPath. When the animation is done, I'd like to be able to call some other method to perform another action. Is there a good way to do this? I've looked at using UIView's setAnimationDidStopSelector:, however…

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• I am using CATiledLayer and UIScrollView, how can I dynamically set CATiledLayer properties?

  - by Mickey Shine

  Basically speaking I am making a map framework (like Route-me and Google Maps). I want to dynamically set properties of CATiledLayer, such as tile numbers, what conditions to trigger reloading tile source, and binding a function when CATiledLayer realoding sources?

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