I learned a lot by watching the original course, nothing like having someone explain in lecture form, after reading about these concepts for a while. And now it looks like, they’ve updated the course. The new instructor has a more calm style, seems like it will be good. http://itunes.apple.com/us/itunes-u/developing-apps-for-ios-sd/id395631522 This is from the first few minutes [...]
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When tracking down a bug, the most useful way to start checking things is to NSLog something. I’m a heavy user of breakpoints and the debugger. I can’t live without it, and it’s saved me countless hours. However I usually see if i can NSLog something first perhaps the problem was an obvious one. A [...]
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Small but quick snippet here. Sending multi-part form with image data: NSString *imagePath = NSString *imagePath = [NSString stringWithFormat:@"%@/%@", [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) lastObject], @"junny.png"]; UIImage *image = [UIImage imageWithContentsOfFile:imagePath]; NSData * imageData = UIImageJPEGRepresentation(image, 0.75) ASIFormDataRequest *request = [ASIFormDataRequest requestWithURL:[NSURL URLWithString:http://example.com/form.php]]; [request setPostValue:@"I like brains!" forKey:@"title"]; [request setPostValue:[NSString stringWithFormat:@"%@", [NSDate date]] forKey:@"session"];l [request [...]
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Often when you work with XML, you need to put a bunch of values into a node, maybe positioning information for example. The best way to do that is to create a “Delimited String”, that is “ABC|123|XYZ|987″, is delimited by the | character. Here’s how you get that back in iOS into an array, that [...]
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-(void) someEventDidOccur EditOptionsViewController *anEditOptionsViewController = [modalViewControllers_ objectForKey:@"someName"]; // A little note about retain/release // views are not aware of their UIViewController // When they don’t have one, and .view is requested UIViewController will simply create a new one. // In the code below, if the order were reversed, "anEditOptionsViewController" would be dealloced // // [...]
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In objective-C a Block is a type of closure. A closure, is a method that contains state information, using free variables. It binds the variables for you on the stack, so in that sense it “closes” the expression. To give an example in javascript you could call setTimeout this way: function callLater(first, second, third) { [...]
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I had a problem in my current project related to this, and it was a good opportunity, to learn a little bit more about how touches are handled in iOS. Enter UIResponder UIResponder is the Class any objects that which to receive events must Subclass, if they wish to receive (among other types) TouchEvents from [...]
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This is a small tip which I’ve encountered twice so far on my current project, and a few times before. The times were far apart enough, that by the time I encountered it again I forgot what the solution was. Just that it was fixible….er somehow. Problem: -You created a new class of UIViewController type, [...]
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Introdction Cocos2D is awesome, and it even comes with some amazing templates to create 3 different kinds of projects. Vanilla version, one that combines Box2d(physics engine), and one that combines it with Chipmunk (physics engine). I see a lot of games that use Cocos2D exclusively from beginning to end, and by default that’s more or [...]
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http://onedayitwillmake.com/blog/2010/09/post-a-day-4-objective-c-flocking-behaviorsboid-class/
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