li.mn

Dec 12

http://railsforum.com/viewtopic.php?id=35600

Nov 30

Advent2009

It’s been a while since I posted here! I’ve got a couple of iPhone apps in the app store now. So that’s fun. Here’s a link to the more timely of the two: http://advent2009app.com (iTunes App Store Link is here).

It’s an advent calendar, for each day from December 1 through December 25, 2009. Casson Demmon of The Make Studio and I put it together, and we’re really excited about the results. Take a look!

Mar 11

SQLitePersistentObjects and SQLPOTests

I’ve been using Jeff LaMarche’s SQLitePersistentObjects library for sqlite access on the iPhone. It’s a very young, but very promising library.

Some discussion on the mailing list prompted me to create SQLPOTests, a sample app that allows you to play with three different backings for a UITableView. I think there are more entries in the sample db than a typical iPhone app will likely sport (i.e., there are 6000 rows in 3 tables), but I’m amazed at the performance gain on scrolling when using the +pairedArrays method instead of loading full objects.

Feb 18

First SBiPhoneDev Meeting

Tonight was the inaugural SBiPhoneDev meeting. It was a fantastic group. We even had a celebrity–Andrew Duncan!

Here are notes, with a link to the slides and code we went over.

If you couldn’t make it tonight, come join us March 18!

Feb 5

STAssertEmpty & STAssertNotEmpty

Update 2009-02-05 15:56: Evaluating the a1s.

Google's iPhone enhancements to the SenTestingFramework are great. But sometimes you just need a little more syntactic sugar.

Below are a couple of macros you can add to your GTMSenTestCase.h file. Each takes an object that responds to -count. You can figure the rest out.

PLAIN TEXT

// Generates a failure when [a1 count]> 0
// Args:
// a1: Something that responds to -count
// description: A format string as in the printf() function. Can be nil or
// an empty string but must be present.
// ...: A variable number of arguments to the format string. Can be absent.
#define STAssertEmpty(a1, description, ...) \
do { \
id a1Value = ( a1 ); \
if ( [a1Value respondsToSelector:@selector( count ) ] ) { \
int _count = ([a1Value count]);\
NSString *_expression = [NSString stringWithFormat:@"Expected an empty %@, count is %d.", [a1Value className], _count]; \
if (description) { \
_expression = [NSString stringWithFormat:@"%@: %@", _expression, STComposeString(description, ##__VA_ARGS__)]; \
} \
STAssertEquals( 0, _count, _expression );\
}\
else {\
NSString *_expression = [NSString stringWithFormat:@"%@ Does not respond to -count.", [a1Value className]]; \
[self failWithException:[NSException failureInFile:[NSString stringWithUTF8String:__FILE__] \
atLine:__LINE__ \
withDescription:_expression]]; \
}\
} while (0)
// Generates a failure when [a1 count] <1
// Args:
// a1: Something that responds to -count
// description: A format string as in the printf() function. Can be nil or
// an empty string but must be present.
// ...: A variable number of arguments to the format string. Can be absent.
#define STAssertNotEmpty(a1, description, ...) \
do { \
id a1Value = ( a1 ); \
if ( [a1Value respondsToSelector:@selector( count ) ] ) { \
int _count = ([a1Value count]);\
NSString *_not_empty_expression = [NSString stringWithFormat:@"Expected a non-empty %@, count is %d.", [a1Value className], _count]; \
if (description) { \
_not_empty_expression = [NSString stringWithFormat:@"%@: %@", _not_empty_expression, STComposeString(description, ##__VA_ARGS__)]; \
} \
STAssertLessThan( 0, _count, _not_empty_expression );\
}\
else {\
NSString *_expression = [NSString stringWithFormat:@"%@ Does not respond to -count.", [a1Value className]]; \
[self failWithException:[NSException failureInFile:[NSString stringWithUTF8String:__FILE__] \
atLine:__LINE__ \
withDescription:_expression]]; \
}\
} while (0)

Jan 26

malloc: unable to create stack log directory /tmp/stack-logs.

Getting errors like the one above when switching from the iPhone Simulator to an actual device?

Turn off MallocStackLogging.

Jan 23

Inserting, deleting, inserting rows in a UITableView

I've been working on a piece of an iPhone app that populates a UITableView with the results of a web service call. There's a button to load the data, and you can reload the data once it's loaded a first time. The reload makes another call to the web service—this is useful because the data may have changed.

I was initially using UITableView's

- (void)deleteRowsAtIndexPaths:(NSArray *)indexPaths withRowAnimation:(UITableViewRowAnimation)animation

and

- (void)insertRowsAtIndexPaths:(NSArray *)indexPaths withRowAnimation:(UITableViewRowAnimation)animation

methods to handle this. It worked great, until the second request to the web service, when the simulator would drop into gdb, and I couldn't figure anything out.

This discussion suggested using

reloadData

instead. It works, but it's less than ideal. You lose the fancy animation when the data are removed. I can still use

insertRowsAtIndexPaths:withRowAnimation:

but the delete method is unusable. Too bad.

Jan 22

3 months?!

Wow, that's quite a hiatus. The holidays have come and gone. The Obaminauguration has come and gone. And here we are, hip deep in recession.

I've been making quite a bit of progress in learning the iPhone SDK. More on that later. I thought for now I'd link to an interesting story about the exemption from federal privacy rules that Obama is giving YouTube.

I guess loyalty has its rewards. (Search for Schmidt, Mayer, Page, Costolo, Drummond, and Hurley from Google, which owns YouTube.)

Oct 16

Political Roasts

Good stuff from Obama (1, 2) and McCain (1, 2).

Sep 10

Where am I?

Working with the CoreLocation API in the iPhone simulator, I logged my latitude, longitude to the console:

<+37.33168900, -122.03073100> +/- 100.00m

Hmm, that doesn't look quite like Santa Barbara. Where could it be?

View Larger Map

1 Infinite Loop. Zoom in to see the Apple campus.

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