Freebase and the iPhone

Freebase on the iPhone Alec Flett <alecf@metaweb.com>

Freebase on the iPhone Tonight: • Freebase.framework • PhotoBase • Hacking

Freebase.framework What’s included: • Static library • Fully Asynchronous API access • CocoaTouch (iPhone) widgets

Freebase.framework • Static library • Help. I don’t know what I’m doing • API stuff mostly works on OS X too • Even works with PyObjC!

Freebase.framework • Freebase APIs • login • mqlread, mqlwrite • search, geosearch • imageThumb, blurb • image upload • touch

Freebase.framework APIs Delegate/selector model FreebaseSession *session = [FreebaseSession session]; [session <apicall>:<query> name:@”convenience_name” delegate:obj didFinishSelector:@selector(someselector:name:etc:) options:[NSDictionary dictionary...]]; • “name” is just useful • “options” is optional

Freebase.framework APIs delegates and didFinishSelector • speciﬁc selector called on success - (void)querydone:(id)result name:(NSString*)name cursor:(NSString*)cursor; • cursor is mqlread only • errorDidOccur:name: on failure

Freebase.framework • CocoaTouch widgets • FreebaseTable - inﬁnite scrolling, sections, thumbnails • FreebaseSuggest - pick a topic, with location support • FreebaseDetail - minimalistic topic view

FreebaseTable

FreebaseSuggest

Geolocation

Topic chosen

PhotoBase More than just a sample app...

PhotoBase Take a picture Choose a topic Upload to Freebase

PhotoBase Logging in [[Freebase session] login:@”alecf” password:@”nice try”, delegate:self didFinishSelector:@selector(loggedin:)];

PhotoBase Choosing a topic FreebaseSuggest uses search/geosearch, mqlread, blurb, imageThumb

PhotoBase Use FreebaseSuggest FreebaseSuggest *fbs = [[FreebaseSuggest alloc] init]; fbs.delegate = self; [self presentModalViewController:fbs animated:YES]; // callback definition - (void)suggest:(FreebaseSuggest*)suggest itemSelected:(NSDictionary*)item { NSString* topicName = [item objectForKey:@”name”]; ... }

FreebaseSuggest Finding topics: [session search:@”x-men” name:@”suggest” delegate:self didFinishSelector:@selector(haveResult:)]; Or geolocate: NSString *location = [[NSDictionary dictionaryWithObjectsAndKeys: @"Point", @"type", [NSArray arrayWithObjects: [NSNumber numberWithDouble:longtitude], [NSNumber numberWithDouble:latitude], nil], @"coordinates", nil] JSONRepresentation]; [session geosearch:location name:@”suggest-geo” delegate:self didFinishSelector:@selector(haveResult:)]; (geolocate + search string is complex)

PhotoBase Choose or take a picture (Built into iPhone API: UIImagePickerController)

PhotoBase Now upload...

PhotoBase Upload implementation: [[FreebaseSession session] uploadImage:image contentType:@"image/jpeg" topic:[topic objectForKey:@"id"] delegate:self didFinishSelector:@selector(uploaded:) options: [NSDictionary dictionaryWithObjectsAndKeys: @"/en/creative_commons_by_sa_2_0", @"license", nil]];

PhotoBase What’s left: • UI stuff - user feedback, login setup, etc Whats next: • Topic geotagging • QR importing • Flickr search • English/metric, distances, etc

Freebase.framework

Freebase.framework Do a little dance

Freebase.framework Do a little dance Make a little app

Freebase.framework Do a little dance Make a little app Lets hack tonight

Freebase.framework Do a little dance Make a little app Lets hack tonight Questions?

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Freebase and the iPhone

by Alec Flett

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