iMeet application is ready. I am very proud of this application, as it represents my achievements in fast learning and adapting to: new way of programming, as XCode and Interface Builder truly represent the ModelViewController paradigm; new language- Objective-C, which as any language has its pluses and minuses; new device: mobile devices on which I didn’t work since my experience on Sales Force Automation in TotalSoft company, back in 2005, on Windows CE.
Tag: Objective-C
18 posts
Adding the points to the map is not as intuitive as it might seem, so let’s start by creating a new class called POI – point of interest. Assuming that we have the Latitude and Longitude as NSStrings, we check if they are filled. Then I create the CLLocationCoordonate2D which basically is a tuple of two doubles and then create the point of interest.
From time to time, you’ll need to show in your iPhone application a view over the entire application without navigating and destroying your workflow of the application. I’ll present the mechanism of modal windows as it is implemented in Cocoa Touch. Lets take a real case: you have a view in which you want to input an address. Near the address you have a button which will show the user the Map centered on the specific address that he inputted. How this can be implemented? The answer is quite simple: you need to declare the view from which you launch […]
One of the tasks in the CSCW lab was to create a map on which the users to see the location of a specific address. So I started working on it, knowing that the newest framework brings a lot of goodies, through which there is also a map framework. But surprise! Apple provides only reverse geocoding, not forward geocoding. This means that you can only transform a pair of Latitude / Longitude to the Map and it will show it to the user. But what to do when user enters an address? My point is that nobody caries with him […]
While working on the CSCW Lab project, I encountered a situation in which the XML-RPC call returned an image, of course encoded as Base64. And guess what – in its known style, Apple doesn’t provide Base64 encoding and decoding – quite lame, given the fact that this encoding is used everywhere in data transfer over the internet – e-mail, browsers, web services – all of them use at some point this encoding to overcome the different local encodings on each one’s machine. Once identified this problem, I had to solve it somehow – but guess what? – over the free […]
During the CSCW Lab, where I had the experience of working on iPhone, I had to connect to a XML RPC server. Some of the parameters of the request had to be formatted as ISO8601 standard. After some reading, I end up using the following code, managing both the conversion of a NSDate to NSString and a NSString to a NSDATE using the above format: NSString –> NSDate -(NSString *) strFromISO8601:(NSDate *) date { static NSDateFormatter* sISO8601 = nil; if (!sISO8601) { sISO8601 = [[NSDateFormatter alloc] init]; NSTimeZone *timeZone = [NSTimeZone localTimeZone]; int offset = [timeZone secondsFromGMT]; NSMutableString […]
Almost any time you’ll need to pull some data from the web. Using Objective-C you have at your disposal a pretty good XML parser – the event-based version. What really means is that instead of building in-memory tree with the structure of the XML you’ll have some events raised when the parser encounters a special token – the most usual ones are tag start, tag end and found comments. The parsing goes node by node and is not nesting-sensitive. As soon as the parser returns you a node, you don’t know where in the structure you are currently anymore. As […]
While reading the book by Mr. Kochan (1st ed): "Programming in Objective C" , I noticed that he uses the following code (you can see it at pages 342-344) to explain that the initWithString is preferable to stringWithString because the AddressCard class would own the name variable contents. Also, I don’t get any errors making repeated calls to the setName version with the stringWithString method. //I didn't added here the header file which has the needed declarations #import "AddressCard.h" @implementation AddressCard; -(NSString *) name{ return name; } //Recommended code: -(void) setName: (NSString *) theName{ [name release] name = [[NSString […]
My latest task in CSCW Lab was to create the parser class for parsing some huge and multilevel XML. All nice and easy at first sight. Since the XML was the result of an RPC call, I got back some structures corresponding to NSDictionary and some arrays corresponding to NSArray in Apple's Objective-C.
While start XCoding, I faced a new challenge : how to create modal, single use confirmation dialogs? So after some digging in the internet, I found out that this can be actually done pretty simple and elegant. This will be very useful if you want to display some deletion confirmation or ask for user permission to use the camera or GPS sensor. All you have to do is just create a UIAlert and the IBAction hooked up to your “Nuclear launch” button, and then have its delegate decide whether to destroy the world or not. In the header file you […]
Solving the problem: no matter what I did, the UIImageView didn’t load the image. After some digging on the Internet about this, I found out that first thing to look for is whether you're sending the setImage message to the UIImageView instance you expect.
For the moment we expect to use either one of those strategies to implement our idea 1.Use Wiimote, an iphone, and a skateboard for implementing this game . Wiimote : as sensor for capturing the type of movement that is currently implemented. iPhone : read the sensed values from Wiimote and implement Game Interface Expected Language for implementation : Objective C . 2. Use iPhone , and adruino board that enables wireless communication with the following sensors: Bending sensor. Accelarometer. Expected Language for implementation : Objective C , and C++