Box 2d Archives

Fixing Undefined Symbols While Integrating Testflight in IOS

Thursday, March 21st, 2013 at 6:32 am  
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The common undefined symbol error appearing while integrating test flight will be something like the following :

Undefined symbols for architecture armv7s:

“_deflateInit_”, referenced from:

_compress_data in libTestFlight.a(tf_compression.o)

“_deflateEnd”, referenced from:

_compress_data in libTestFlight.a(tf_compression.o)

“_deflate”, referenced from:

_compress_data in libTestFlight.a(tf_compression.o)

ld: symbol(s) not found for architecture armv7s

clang: error: linker command failed with exit code 1 (use -v to see invocation)

 

The fix for this issue is simple.

Goto the build phases of the target for which the issue is appearing. In the link binary with libraries section, use the ‘+’ button at the bottom to add a new library. In the dialog box which appears, search for libz.dylib . You will see the library in the list. Select that and press the ‘Add’ button.

Now perform a build clean for the project and you are done.

Build the app and the issue will be fixed.

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Getting the Child View Controllers of a View Controller in Xcode

Friday, March 8th, 2013 at 8:01 am  
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We can get the child view controllers of a view controller using the childViewControllers property of the view controller.

If we are in a view controller class, if we want to get its child view controllers, then we can use the following code :

self.childViewControllers;

This will return an array of view controllers that are the child of the current view controller.

If there are no child view controllers of the current view controller, then the array will be empty.

 

If we are to get the child view controllers of a navigation controller, we can use the following code :

self.navigationController.childViewControllers;

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Passing Multiple Parameters to PerformSelector Method in Xcode

Friday, March 8th, 2013 at 7:55 am  
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It is possible to pass a single parameter to performSelector: method in Xcode using the following method :

 

[self performSelector:@selector(selectorNamewithArg:) withObject:param];

 

But what to do if we have to pass multiple parameters? There is a way to pass upto two parameters to the performSelector: method. It can be implemented using the following method :

 

[self performSelector:@selector(selectorNamewithArg1: Arg2:) withObject:param1 withObject:param2];

 

Here, two parameters are passed to the selector method.

 

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Converting a CLLocation object to CLLocationCoordinate2D in Xcode

Wednesday, January 9th, 2013 at 4:14 pm  
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We can convert a CLLocation object to a CLLocationCoordinate2D object using the coordinate property of the CLLocation object. This can be done as follows :

 

Consider a CLLocation object name myLocation. Now we can get the equivalent CLLocationCoordinate2D of myLocation as,

 

CLLocationCoordinate2D myCoordinate = myLocation.coordinate;

 

We can obtain the latitude and longitude of a CLLocationCoordinate2D object using its latitude and longitude properties.

 

i.e.,

double myLatitude = myCoordinate.latitude; // this will give the latitude value of the coordinate

double myLongitude = myCoordinate.longitude;// this will give the longitude value of the coordinate

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How to Initialize a CLLocation object with a Latitude and Longitude in Xcode

Wednesday, January 9th, 2013 at 4:04 pm  
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It is possible to initialize a CLLocation object with a latitude and longitude in Xcode. Consider two float values corresponding to the latitude and longitude value you want to use, as follows :

 

double your_latitiude_value = 8.391916;

double your_longitude_value = 77.094315;

 

We can initialize a CLLocation object using these latitude and longitude values as follows :

 

CLLocation *myLocation = [[CLLocation alloc] initWithLatitude:your_latitiude_value longitude:your_longitude_value];

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How to Get the RootViewController from within a Scene in Cocos2d Xcode

Wednesday, December 26th, 2012 at 9:11 am  
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It is possible to get the rootviewcontroller of the project from within a class or scene in cocos2d using Xcode. This can be done using the nextResponder method of the OpenGLview of cocos2d director. It can be implemented as follows :

 

 

 

UIViewController *rootViewController = (UIViewController *)[[[CCDirector sharedDirector] openGLView] nextResponder];

 

In this, the rootViewController object will contain the original root view controller of the project.

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How to include and use new fonts in iPhone SDK?

Wednesday, December 12th, 2012 at 9:32 am  
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  1. Add the font files to your resource files
  2. Edit your Info.plist: Add a new entry with the key Fonts provided by application.
  3. For each of your files, add the file name to this array

In your application you can the use [UIFont fontWithName:@"YourFontName" size:14.f].

Note: this is available in iOS 3.2 and later.

Joints in Box2d

Friday, November 30th, 2012 at 4:02 pm  
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Joints

Box2D has a number of ‘joints’ that can be used to connect two bodies together. These joints can be used to simulate interaction between objects to form hinges, pistons, ropes, wheels, pulleys, vehicles, chains, etc. Learning to use joints effectively helps to create a more engaging and interesting scene.

Here are the joints in Box2D v2.1.2:

  • Revolute – a hinge or pin, where the bodies rotate about a common point
  • Distance – a point on each body will be kept at a fixed distance apart
  • Prismatic – the relative rotation of the two bodies is fixed, and they can slide along an axis
  • Line – a combination of revolute and prismatic joints, useful for modelling vehicle suspension
  • Weld – holds the bodies at the same orientation
  • Pulley – a point on each body will be kept within a certain distance from a point in the world,
    where the sum of these two distances is fixed, kinda… (sheesh… there is no succinct way to describe this)
  • Friction – reduces the relative motion between the two bodies
  • Gear – controls two other joints (revolute or prismatic) so that the movement of one affects the other
  • Mouse – pulls a point on one body to a location in the world
Joints added after v2.1.2:

  • Wheel – the line joint, renamed
  • Rope – a point on each body will be constrained to a maximum distance apart

How to Fix the Orientation Issue in IOS6 for Cocos2d

Tuesday, November 6th, 2012 at 5:22 pm  
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To fix the orientation issue in IOS6 while using Cocos2d, perform the following :

 

Inside AppDelegate.m file

Replace the following line of code

[window addSubview: viewController.view];

With the following lines of code

if ( [[UIDevice currentDevice].systemVersion floatValue] < 6.0)

{

// Note : addSubView doesn’t work on IOS6

[window addSubview: viewController.view];

}

else

{

// For IOS6, use this method

[window setRootViewController:viewController];

}

Now inside RootViewController.m file

// For IOS6, use supportedInterfaceOrientations & shouldAutorotate instead of shouldAutorotateToInterfaceOrientation

- (NSUInteger) supportedInterfaceOrientations{

return UIInterfaceOrientationMaskLandscape;

}

- (BOOL) shouldAutorotate {

return YES;

}

That is it. The orientation issue will be fixed now.

Note : If your application supports for IOS versions less than 6.0, then you can keep the shouldAutorotateToInterfaceOrientation method.

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Getting Device IOS Version in Xcode

Tuesday, November 6th, 2012 at 5:16 pm  
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To get the current running device IOS version  using Xcode, use the following code :

[[UIDevice currentDevice].systemVersion floatValue]

The resultant value will be a floating value.

For example, for IOS6, the above code will return the value 6.0

 

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