ios Cvičení RSS čtečka

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1 strana 1 ios Cvičení RSS čtečka Jiří Kamínek Kaminek.jiri@stoneapp.com

2 strana 2 Vytvoření nového projektu v XCode Název RSSLesson Navigation-based Application use Core Data for storage nezaškrtávat

3 strana 3 Vytvoření modelu <?xml version="1.0" encoding="utf-8"?> <rss version="2.0"> <channel> <title>živě.cz</title> <link> <description> </description> <language>cs</language> <pubdate>mon, 7 Mar :00:00 GMT</pubDate> <image> <title>živě.cz</title> <url> <link> </image> <item> <title>western Digital zaplatí 4,3 miliardy dolarů za výrobu disků Hitachi</title> <link> <guid> <description> Mezi výrobci pevných disků dojde k důležitému spojení sil. Světová dvojka Western Digital koupí divizi pevných disků společnosti Hitachi, uvedl to Western Digital v dnešní tiskové zprávě. Koupě vyjde na 4,3 miliardy dolarů a měla by z Western Digital udělat největšího výrobce pevných disků a...</description> <pubdate>mon, 7 Mar :01:00 GMT</pubDate> </item> </chanel> </rss>

4 strana 4 Vytvoření modelu <item> <title>western Digital zaplatí 4,3 miliardy dolarů za výrobu disků Hitachi</title> <link> miliardy-dolaru-za-vyrobu-disku-hitachi/sc-4-a /default.aspx</ link> <description> Mezi výrobci pevných disků dojde k důležitému spojení sil. Světová dvojka Western Digital koupí divizi pevných disků společnosti Hitachi, uvedl to Western Digital v dnešní tiskové zprávě. Koupě vyjde na 4,3 miliardy dolarů a měla by z Western Digital udělat největšího výrobce pevných disků a...</description> <pubdate>mon, 7 Mar :01:00 GMT</pubDate> </item>

5 strana 5 XML parser SAX Simple API for XML DOM Document Object Model

6 strana 6 RSSProcessor.h Protokol <NSXMLParserDelegate> - (void) parserssfeedaturl:(nsstring*)urladdress;

7 strana 7 RSSProcessor.h id delegate; NSXMLParser * rssparser; NSMutableArray * stories; NSMutableDictionary * item; NSString * currentelement; NSMutableString * currenttitle, * currentdate, * currentsummary, * currentlink;

8 strana 8 RSSProcessor.m - (id) init { } if (self = [super init]) { stories = [[NSMutableArray alloc] init]; } return self;

9 strana 9 RSSProcessor.m - (void)dealloc { } [stories release]; [super dealloc];

10 strana 10 RSSProcessor.m - (void) parserssfeedaturl:(nsstring*)urladdress; { //you must then convert the path to a proper NSURL or it won't work NSURL *xmlurl = [NSURL URLWithString:urlAddress]; rssparser = [[NSXMLParser alloc] initwithcontentsofurl:xmlurl]; // Set self as the delegate of the parser so that it will receive the parser delegate methods callbacks. [rssparser setdelegate:self]; } [rssparser parse];

11 strana 11 RSSProcessor.m - (void)parser:(nsxmlparser *)parser parseerroroccurred: (NSError *)parseerror { } NSLog(@"error parsing XML");

12 strana 12 RSSProcessor.m - (void)parser:(nsxmlparser *)parser didstartelement:(nsstring *)elementname namespaceuri:(nsstring *)namespaceuri qualifiedname:(nsstring *) qname attributes:(nsdictionary *)attributedict{ currentelement = [elementname copy]; } if ([elementname isequaltostring:@"item"]) { } // clear out our story item caches... item = [[NSMutableDictionary alloc] init]; currenttitle = [[NSMutableString alloc] init]; currentdate = [[NSMutableString alloc] init]; currentsummary = [[NSMutableString alloc] init]; currentlink = [[NSMutableString alloc] init];

13 strana 13 RSSProcessor.m - (void)parser:(nsxmlparser *)parser didendelement:(nsstring *)elementname namespaceuri:(nsstring *)namespaceuri qualifiedname:(nsstring *) qname{ if ([elementname isequaltostring:@"item"]) { // save values to an item, then store that item into the array... [item setobject:currenttitle forkey:@"title"]; [item setobject:currentlink forkey:@"link"]; [item setobject:currentsummary forkey:@"summary"]; [item setobject:currentdate forkey:@"date"]; } } [stories addobject:[item copy]]; NSLog(@"adding story: %@", currenttitle);

14 strana 14 RSSProcessor.m - (void)parser:(nsxmlparser *)parser foundcharacters:(nsstring *)string{ // save the characters for the current item... } if ([currentelement isequaltostring:@"title"]) { [currenttitle appendstring:string]; } else if ([currentelement isequaltostring:@"link"]) { [currentlink appendstring:string]; } else if ([currentelement isequaltostring:@"description"]) { [currentsummary appendstring:string]; } else if ([currentelement isequaltostring:@"pubdate"]) { } [currentdate appendstring:string];

15 strana 15 RSSProcessor.m - (void)parserdidenddocument:(nsxmlparser *) parser { NSLog(@"all done!"); } [delegate setitems:stories]; [[_delegate tableview] reloaddata];

16 strana 16 Zobrazení výsledku

17 strana 17 MainWindow.xib Nadpis RSS Lesson

18 strana 18 RootViewController.xib UITableView

19 strana 19 RootViewController.h NSArray (nonatomic, copy) NSArray *items;

20 strana 20 items;

21 strana 21 RootViewController.m - (NSInteger)tableView:(UITableView *) tableview numberofrowsinsection: (NSInteger)section return [items count];

22 strana 22 RootViewController.m - (UITableViewCell *)tableview:(uitableview *) tableview cellforrowatindexpath:(nsindexpath *) indexpath [cell.textlabel settext:[[items objectatindex:indexpath.row] valueforkey:@"title"]];

23 strana 23 RootViewController.m - (void)viewdidload items = nil; RSSProcessor *rssprocessor = [[[RSSProcessor alloc] initwithdelegate:self] autorelease]; [rssprocessor parserssfeedaturl:@" //#import "RSSPRocessor.h"

24 strana 24 Protokol Lepší řešení Model musí mít znalost controlleru

25 strana 25 ItemProtocol - (void)

26 strana 26 RSSProcessor.h #import "ItemProtocol.h" id <ItemProtocol> (retain) id <ItemProtocol> delegate;

27 strana 27 RootViewController.h #import RootViewController : UITableViewController <ItemProtocol>

28 strana 28 RSSProcessor.m - (void)parserdidenddocument:(nsxmlparser *) parser { NSLog(@"all done!"); } [delegate updateitemsource:stories];

29 strana 29 RootViewController - (void) updateitemsource:(nsarray*)itemarray { } [self setitems:itemarray]; [[self tableview] reloaddata];

30 strana 30 Zobrazení detailu? Přejdeme na web

31 strana 31 Přidáme nový View Classes -> Add -> New file Cocoa Touch Class With XIB for user interface WebController.h

32 strana 32 WebController.h Protokol <UIWebViewDelegate> IBOutlet UIWebView *_webview; NSString (nonatomic, copy) NSString *urladdress;

33 strana 33 urladdress;

34 strana 34 WebController.m - (void)viewdidload self.title

35 strana 35 WebController.m - (void)viewwillappear:(bool)animated{ NSURL *url = [NSURL URLWithString:[urlAddress stringbyreplacingoccurrencesofstring:@" " withstring:@""]]; NSURLRequest *request = [NSURLRequest requestwithurl:url]; [_webview loadrequest:request]; } [_webview setdelegate:self]; [_webview loadrequest:request];

36 strana 36 WebController.m - (void)viewwilldisappear:(bool)animated{ NSURL *url = [NSURL URLWithString:@"about:blank"]; } NSURLRequest *request = [NSURLRequest requestwithurl:url]; [_webview loadrequest:request];

37 strana 37 Zobrazený web

38 strana 38 RootViewController.m: - (void)tableview:(uitableview *)tableview didselectrowatindexpath:(nsindexpath *)indexpath WebController *detailviewcontroller = [[WebController alloc] initwithnibname:@"webcontroller" bundle:[nsbundle mainbundle]]; [detailviewcontroller seturladdress:[[items objectatindex:indexpath.row] valueforkey:@"link"]]; [self.navigationcontroller pushviewcontroller:detailviewcontroller animated:yes]; [detailviewcontroller release];

39 strana 39 Web na celou obrazovku [_webview setscalespagetofit:yes];

40 strana 40 StatusBar indikátor načítání

41 strana 41 WebController.m - (void)webviewdidstartload:(uiwebview *)webview { } UIApplication* app = [UIApplication sharedapplication]; app.networkactivityindicatorvisible = YES;

42 strana 42 WebController.m - (void)webviewdidfinishload:(uiwebview *)webview { UIApplication* app = [UIApplication sharedapplication]; app.networkactivityindicatorvisible = NO; } - (void)webview:(uiwebview *)webview didfailloadwitherror: (NSError *)error { } UIApplication* app = [UIApplication sharedapplication]; app.networkactivityindicatorvisible = NO;

43 strana 43 Rychlé zobrazení detailu

44 strana 44 Rychlé zobrazení detailu Classes -> Add -> New file Cocoa Touch Class With XIB for user interface DetailViewController.h

45 strana 45 DetailViewController.h IBOutlet UILabel *titlelabel; IBOutlet UILabel *timelabel; IBOutlet UITextView *textview; NSString (nonatomic, retain) IBOutlet UILabel (nonatomic, retain) IBOutlet UILabel (nonatomic, retain) IBOutlet UITextView (nonatomic, retain) NSString *url;

46 strana 46 titlelabel, timelabel, textview, url;

47 strana 47 DetailViewController.m - (void)viewdidload self.title Detail";

48 strana 48 DetailViewController.h IBOutlet UILabel *titlelabel; IBOutlet UILabel *timelabel; IBOutlet UITextView *textview; NSString (nonatomic, retain) IBOutlet UILabel (nonatomic, retain) IBOutlet UILabel (nonatomic, retain) IBOutlet UITextView (nonatomic, retain) NSString *url;

49 strana 49 DetailViewController.m //pridat do (.h) //- (IBAction) showweb - (IBAction) showweb { } WebController *detailviewcontroller = [[WebController alloc] initwithnibname:@"webcontroller" bundle:[nsbundle mainbundle]]; [detailviewcontroller seturladdress:url]; [self.navigationcontroller pushviewcontroller:detailviewcontroller animated:yes]; [detailviewcontroller release];

50 strana 50 Rychlé zobrazení detailu

51 strana 51 DetailViewController.m DetailViewController *detailviewcontroller = [[DetailViewController alloc] initwithnibname:@"detailviewcontroller" bundle:[nsbundle mainbundle]]; [self.navigationcontroller pushviewcontroller:detailviewcontroller animated:yes]; NSString *l = [[items objectatindex:indexpath.row] valueforkey:@"link"]; [detailviewcontroller seturl:l]; NSString *t = [[items objectatindex:indexpath.row] valueforkey:@"title"]; [[detailviewcontroller titlelabel] settext:t]; NSString *s = [[items objectatindex:indexpath.row] valueforkey:@"summary"]; [[detailviewcontroller textview] settext:s]; NSString *d = [[items objectatindex:indexpath.row] valueforkey:@"date"]; [[detailviewcontroller timelabel] settext:d]; [detailviewcontroller release];

52 strana 52 Více RSS zdrojů? RootViewController.m RSSProcessor *secondrssprocessor = [[[RSSProcessor alloc] initwithdelegate:self] autorelease]; [secondrssprocessor parserssfeedaturl:@"

53 strana 53 Více RSS zdrojů? - (void)parserdidenddocument:(nsxmlparser *)parser { NSLog(@"all done!"); NSMutableArray *tmparray = [[[NSMutableArray alloc] init] autorelease]; [tmparray addobjectsfromarray:[_delegate items]]; [tmparray addobjectsfromarray:stories]; } [_delegate setitems:tmparray];

54 strana 54 Děkuji za pozornost!