Dom's Code

Looks very interesting…$A600 for 2 days…I think its waitlist only now unfortunately…

http://devdays.stackoverflow.com/sydney/

Dom

So I have just finished my first year of blogging and funny enough I am still going and really enjoying the blogging world. I get a lot of satisfaction from blogging about .Net and iPhone

I do however, have a couple of significant regrets I will try and fix in the near future:

1.Not enough iPhone posts – will put more effort into getting lots more iPhone dev material.

2. Not enough tutorials/sample apps – again will try to get more tutes and sample appps.

Ok so thats enough self criticism but they are the two areas I want to focus a bit more on over the next year . Big thanks to all readers and commenters, Also special thanks to my review team (used for articles/tutorials): Cath Tippett,Matty Rumble and Paul Johnston.

As for Pirates, well of course I have just come back from the national touch football championships with the ACT Pirates (OK so the fact that we didn’t win a game might look on paper like a bad result – I think it was just a case of playing too many games on the dry fields and not enough on the Pacific Ocean).

Tha Lazy landlubbers, Arggggggghhhhhh!!!!!!
Dom

http://www.virtualtechsummits.com/Register.aspx?EventID=11

Cheers

Dom

I came across this recently and given that you get both sides of the story (well at least almost) its not a bad way of considering the two big options for iPhone development.

http://stackoverflow.com/questions/1583856/is-monotouch-worth-the-cost-or-should-i-just-learn-objective-c

Dom

Some big big news on the iPhone developer front particularly for the multi-class (Dungeons and Dragon reference) iPhone/.Net Developers.

http://www.apple.com/pr/library/2010/09/09statement.html

Specifically:

“In particular, we are relaxing all restrictions on the development tools used to create iOS apps, as long as the resulting apps do not download any code. This should give developers the flexibility they want, while preserving the security we need.“

I’ll keep you up to date from any statements from the Monotouch mailing lists. For a lot of .Net devs, who have been in a holding pattern over Monotouch for around 9 months, they are probably doing a little dance.  There had previously been some uncertainty on the legitimacy of using Monotouch to deploy to the iTunes store!!!!!

Dom

Geoff Lamarche is author of the great introductory book (Begnning iPhone development) for the iphone developer – here is the blog for the man: http://iphonedevelopment.blogspot.com/

Dom

Which way to the battle? –  The Introduction

This tutorial is a short introduction to iPhone development. Like most of my tutorials it’s based on a game.

This is the second in a series of tutorials. The first tutorial was a TDD tutorial in C# 4.0.

This version of the tutorial is similar in functionality to the C# version with obvious changes to the UI as needed. I am not using a TDD approach, mainly because I am not really up to TDD on the iPhone yet.

By completing this tutorial you will:

• Get a taste of the iPhone development experience; and
• Design a simple UI in Interface Builder.

CannonAttack iPhone is a simple game where a player enters an angle and velocity of a cannonball to hit a target at a given distance. The game uses a basic formula for calculating the trajectory of the cannonball and the player keeps taking turns at shooting at the target until it has been hit

Where are the cannonballs – What you need:

I built this with the following tools:

• iPhone SDK (3.1); and
• MAC OS X 10.6 Snow Leopard

Whilst this is a pretty basic introduction to iPhone development, it assumes a very basic knowledge of iPhone development and while it doesn’t spell out every single step, you should have more than enough detail to complete it.

The battleplan – The CannonAttack Requirements/Specs:

The following is a combination of Requirements and Specifications that will give us some guide in terms of the application we are trying to build:

• iPhone Application;
• Allow player to set Angle and Speed of the Cannon Ball to Shoot at  a Target;
• Target Distance is simply the distance of the Cannon to Target, and is created randomly by default but can be overridden;
• Max distance for target is 20000 meters;
• Base the algorithm for the calculation of the cannons trajectory upon the following code (distance and height is meters and velocity is meters per second):

distance = velocity * Math.Cos(angleInRadians) * time;

height = (velocity * Math.Sin(angleInRadians) * time) – (GRAVITY * Math.Pow(time, 2)) / 2;

• A hit occurs if the cannon is within 50m of the target;
• Display number of shots for a hit

Building the Cannon – Creating the Cannon UI

• Start XCode and Create a View based application – call it CannonAttack
• Now add a class to the Project and call it Cannon.m (generate the .h file as well).
• Double click on the file CannonAttackViewController.xib:  (this will open up Interface Builder).
• Create the following UI using the design tools in IB (base this on this screen):

• Also, Add a button that covers the whole screen in the iPhone UI in Interface Builder. Click on this button and from the LAYOUT Menu select SEND TO BACK. This is important as we will use this hidden button to remove the keyboard for the textfields when we click in the background or one of the buttons.
• Also make sure you have set the keyboard type for the textboxes to number pad.
• You need to then go back to XCode and add the following Code to the .h file.
• Now add the following to the .m file

#import <UIKit/UIKit.h>

@interface CannonLauncher1ViewController : UIViewController {

IBOutlet UILabel *descriptionLabel;

IBOutlet UILabel *resultLabel;

IBOutlet UITextField *speedTextField;

IBOutlet UITextField *angleTextField;

IBOutlet UILabel *shotCountLabel;

int targetDistance;

int shotCount;

}

//Properties

@property (nonatomic,retain) UILabel *descriptionLabel;

@property (nonatomic,retain) UILabel *resultLabel;

@property (nonatomic,retain) UITextField *speedTextField;

@property (nonatomic,retain) UITextField *angleTextField;

@property (nonatomic,retain) UILabel *shotCountLabel;

//Actions

-(IBAction)fireButton:(id)sender;

-(IBAction)resetButton:(id)sender;

-(IBAction)backgroundClick:(id)sender;

//Methods

-(void)hideNumberKeyboard;

-(void)resetTextBoxes;

@end

So now add the following code to the .m file

#import "CannonLauncher1ViewController.h"

#import "Cannon.h"

@implementation CannonLauncher1ViewController

@synthesize descriptionLabel;

@synthesize resultLabel;

@synthesize speedTextField;

@synthesize angleTextField;

@synthesize shotCountLabel;

- (void)viewDidLoad {

[super viewDidLoad];

[self resetTextBoxes];

}

//Button handler for the fire button

-(IBAction) fireButton:(id) sender

{

NSInteger velocity = [[speedTextField text]intValue];

NSInteger angle = [[angleTextField text]intValue];

Cannon *cannon = [[Cannon alloc]init];

cannon.targetDistance = targetDistance;

[cannon Shoot:angle Speed:velocity];

shotCount ++;

resultLabel.text = cannon.message;

shotCountLabel.text =

[NSString stringWithFormat: @"Shot Count %d", shotCount];

[self hideNumberKeyboard];

[cannon release];

}

//Button handler for the reset button

-(IBAction) resetButton:(id) sender

{

[self resetTextBoxes];

}

//Button Handler for the main backgtound button

-(IBAction)backgroundClick:(id)sender

{

[self hideNumberKeyboard];

}

//Hides the number keyboard

-(void)hideNumberKeyboard

{

[speedTextField resignFirstResponder];

[angleTextField resignFirstResponder];

}

//Reset the distance and set it as rge text of the description label

-(void)resetTextBoxes

{

targetDistance = rand() %10000;

NSString *distanceText = [[NSString alloc] initWithFormat: @"Distance %d meters (50m",targetDistance];

descriptionLabel.text = distanceText;

speedTextField.text = @"";

angleTextField.text = @"";

shotCount = 0;

[distanceText release];

}

//Built in Method I didn't change this

- (void)didReceiveMemoryWarning {

// Releases the view if it doesn't have a superview.

[super didReceiveMemoryWarning];

}

//Built in Method to clean up any objects

- (void)dealloc {

[descriptionLabel release];

[resultLabel release];

[speedTextField release];

[angleTextField release];

[shotCountLabel  release];

[super dealloc];

}

@end

OK so all we have to do now is implement the cannon class.

Now edit the cannon.h file and replace the code with this header code:

//

//  Cannon.h

//  CannonLauncher1

//

//  Created by Dom Millar on 16/06/10.

//  Copyright 2010 __MyCompanyName__. All rights reserved.

#import <Foundation/Foundation.h>

@interface Cannon : NSObject {

@private int targetDistance;

NSString *message;

}

@property  (readwrite,assign)int targetDistance;

@property  (nonatomic,retain) NSString *message

-(IBAction) Shoot: (int) angle Speed: (int) speed;

@end

Now all we have to do is add the code for cannon.m

//

//  Cannon.m

//  CannonLauncher1

//

//  Created by Dom Millar on 16/06/10.

//  Copyright 2010 __MyCompanyName__. All rights reserved.

//

#import "Cannon.h"

@implementation Cannon

@synthesize targetDistance;

@synthesize message;

-(IBAction) Shoot: (NSInteger) angle Speed: (NSInteger) velocity

{

//set up the local variables for the shoot method

float time = 0;

float height = 0;

float distance = 0;

float gravity = 9.80665;

float variation = 50;

float pi = 3.1415926536;

//Keep calculating height and distance untill height < 0

while(height >= 0)

{

float angleInRadians = ( pi / 180 ) * angle;

distance = velocity * cos(angleInRadians) * time;

height = (velocity * sin(angleInRadians)) - (gravity * pow(time,2));

time++;

}

//Complete calculation

if ((targetDistance >= distance-variation) && (targetDistance <= distance+variation))

{

//Display the hit

message = @"Hit";

}

else

{

//Display the Miss

NSString *description = [NSString stringWithFormat:@"Missed target landed at %f meters" , distance];

message = description;

//[description release];

}

}

@end

Now make sure everything builds. Go back interface builder and you need to do setup the following outlets and actions:

This shows you all the hooks we need:

OK now You should be ready to run, go back to XCode and run the app and you should be able to play the game like:

You can see the Keyboard is visible here – once we click on a button or the main screen the keyboard will disappear:

Victory Condition – In summary

So that’s it – our latest version of the Cannon Attack game is complete. There are lots of changes you can make to make the game more interesting so play around with the project as much as you like.

Happy Coding – Dom.

Have a look

http://www.appleinsider.com/print/10/06/19/inside_apples_new_xcode_4_development_tool.html

Dom

Introduction:

This is a short guide to resolving the issue of the expired certificate using XCode with the iPhone SDK – its probably relevant for setting up your certificate from scratch as well. I am not totally convinced this is the best way of fixing the expired certificates for iPhone Development, but it worked for me so.

The Environment:

The development environment  is a follows:

1. MACBOOK PRO;
2. SnowLeopard OS;
3. XCode 3.2 ; and
4. iPhone developer program member.

The Problem:

You’ll may get a variety of messages when the certificate expires and they will include:

a valid signing identity matching this profile could not be found in your keychain

or :

 

code sign error: the identiy matching this profile could not be found in your keychain

 

or

• goto http://developer.apple.com/iphone/index.action
• login using your iphone developer membership credentials
• click the Certificates tab and you should see the following message:

You currently do not have a valid certificate

Getting a new certificate:

1. From Applications->Utilities Click KeyChain Access
2. From the Keychain Menu Select Certificate Assistant->Request a Certificate From a Certificate Authority
3. Enter your email address and your common name and select Save to disk
4. Go to http://developer.apple.com/iphone/index.action and login
5. Go to the Provisioning portal in the iphone developer and select Certificates
6. Remove the existing certificate
7. Add a new certificate
8. Choose File selects the file you created in step 3
9. Click Approve
10. Reload the page. Now you should see the download button.
11. Click Download
12. Then select it the downloaded file
13. You will receive a dilog stating “Do you want to add the certificates from the file…. To a keychain”. Select YES.
14. Click Add and you should see the certificate list with the new valid certificate displayed.
15. That’s all you should have to do however you may notice a dialog asking you to use the new key – just select Allow or Always Allow.

Dom

Not a free resource but given that its almost 3 weeks of training I think $800 is pretty cheap:

http://www.tsumea.com/australasia/australia/news/120510/iphone-game-development-course-at-rmit-now-accepting-students

Dom