Manus

Xcode

1. Starte Xcode, Opprette prosjekt, Empty application
2. Oversikt over XCode
3. Prosjektinnstillinger
4. Bygge og kjøre apps

Lage SpotifyPlayerViewController

1. Lage storyboard og sette main interface + fjerne innhold i AppDelegate
2. Dra inn en ViewController, knapp og label i Storyboardet
3. Lage og sette tilhørende ViewController klasse (Hva er *.h og *.m filene)
4. Knytte interface-elementer til underliggende ViewController, slik at de kan refereres fra kode
5. Lag SpotifyTrack (Klasser, Arv, imports, @properties (ivars), Objekter har pekere)

   @interface SpotifyTrack : NSObject
   	@property (nonatomic, strong) NSString *id;
   	@property (nonatomic, strong) NSString *artist;
   	@property (nonatomic, strong) NSString *title;
   	@property (nonatomic, strong) NSURL *thumbnailUrl;
   @end
   

6. Opprett en ny SpotifyTrack i SpotifyPlayerViewController sin viewDidLoad

   - (void)viewDidLoad
   {
       [super viewDidLoad];
       SpotifyTrack *track = [[SpotifyTrack alloc] init];
       track.id = @"";
       track.title = @"";
       self.titleLabel.text = track.title;
   }
   

7. Knytte knapp til IBAction og forklare message passing (metode kall)

   - (IBAction)openInSpotifyButtonTouch:(id)sender {
       [[UIApplication sharedApplication] openURL:[NSURL URLWithString:[NSString stringWithFormat:@"spotify://%@", self.track.id]]];
   }
   

Lage SpotifySearchResultTableViewController

1. Lage TableViewController og NavigationController i Interface Builder
2. Forklare Delegates
3. Implementere statisk array med SpotifyTracks

   SpotifyTrack track1 = [SpotifyTrack alloc] init];
   track1.id = @"1"
   track1.title = @"Title";
   track1.artist = @"Artist";
   
   SpotifyTrack track2 = [SpotifyTrack alloc] init];
   track1.id = @"1"
   track1.title = @"Title";
   track1.artist = @"Artist";
   
   self.tracks = @[track1, track2];
   

4. Implementere DataSource metodene til UITableView delegate

   - (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
   {
       return self.tracks.count;
   }
   
   - (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
   {
       static NSString *CellIdentifier = @"trackCell";
       UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier forIndexPath:indexPath];
       SpotifyTrack *track = self.tracks[indexPath.row];
       cell.textLabel.text = track.title;
       cell.detailTextLabel.text = track.artist;
       
       return cell;
   }
   

5. Lage property på SpotifyPlayerViewController for track og fjerne fra viewDidLoad
6. Vise hvordan man kan sende data via navigationController seque

   - (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender
   {
       SpotifyPlayerViewController *viewController = (SpotifyPlayerViewController *)[segue destinationViewController];
       viewController.track = self.tracks[[[self.tableView indexPathForSelectedRow] row]];
   }
   

Lage SpotifyService

1. Forklare Klasse metoder og Blocks

   		
   #import <Foundation/Foundation.h>
   @class SpotifyTrack;
   
   typedef void(^KSpotifyTrackSearchResult)(NSArray* tracks);
   typedef void(^KSpotifyServiceError)(NSError* error);
   
   @interface SpotifyService : NSObject
   +(void)findTracks:(NSString *)title result:(KSpotifyTrackSearchResult)result error:(KSpotifyServiceError)error;
   @end
   
   
   
   + (void)findTracks:(NSString *)title result:(KSpotifyTrackSearchResult)result error:(KSpotifyServiceError)error {
       
       NSString *urlString = [NSString stringWithFormat:@"http://ws.spotify.com/search/1/track.json?q=%@", [title stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding]];
       
       [KURLConnection startWithRequest:[NSURLRequest requestWithURL:[NSURL URLWithString:urlString]] successHandler:^(NSData *response) {
           NSError *convertError = nil;
           NSArray *tracks = [SpotifyService convertDataResponseToTracks:response error:&convertError];
           
           if (convertError != nil) {
   
               error(convertError);
           }
           
           result(tracks);
       } failedHandler:^(NSError *requestError) {
           error(requestError);
       }];
   }
   
   + (NSArray *)convertDataResponseToTracks:(NSData *)response error:(NSError **)error {
       
       NSError __autoreleasing *jsonError = nil;
       NSDictionary *dictionary = [NSJSONSerialization JSONObjectWithData:response options:NSJSONReadingAllowFragments error:&jsonError];
       
       if (jsonError != nil) {
           NSLog(@"Failed parsing json: %@", [jsonError localizedDescription]);
           error = &jsonError;
       }
       
       NSMutableArray *tracks = [[NSMutableArray alloc] init];
       for (NSDictionary *track in dictionary[@"tracks"]) {
           [tracks addObject:[SpotifyService convertResponseTrackToTrack:track]];
       }
       
       return tracks;
   }
   
   + (SpotifyTrack *)convertResponseTrackToTrack:(NSDictionary *)trackObject {
       SpotifyTrack *track = [[SpotifyTrack alloc] init];
       
       track.id = trackObject[@"href"];
       track.title = trackObject[@"name"];
       track.artist = trackObject[@"artists"][0][@"name"];
       
       return track;
   }
   

2. Forklare Error handling
3. Forklare Blocks
4. Forklare KURLConnection med threading og NSJSONSerialization
5. Forklare NSDictionary
6. Bytt ut statisk array med service
7. Lag UISearchBar og set opp delegate

   	
   - (void) searchBarSearchButtonClicked:(UISearchBar *)searchBar {
       [searchBar resignFirstResponder];
       
       [SpotifyService findTracks:searchBar.text result:^(NSArray *tracks) {
           self.tracks = tracks;
           [self.tableView reloadData];
       } error:^(NSError *data) {
           UIAlertView * alertView = [[UIAlertView alloc] initWithTitle:@"Feilet" message:@"Feilet skikkelig" delegate:nil cancelButtonTitle:@"OK" otherButtonTitles:nil, nil];
           [alertView show];
       }];
   }