ios Cvičení RSS čtečka

25.2.2011

strana 1

iOS Cvičení RSS čtečka Jiří Kamínek [email protected]

25.2.2011

strana 2

Vytvoření nového projektu v XCode •  Název –  RSSLesson

•  Navigation-based Application •  use Core Data for storage –  nezaškrtávat

25.2.2011

strana 3

Vytvoření modelu http://www.zive.cz/default.aspx <description> cs Mon, 7 Mar 2011 20:00:00 GMT http://www.zive.cz/Client.Images/Logos/logo-zive-rss.gif http://www.zive.cz/default.aspx http://www.zive.cz/bleskovky/western-digital-zaplati-43-miliardy-dolaru-za-vyrobu-disku-hitachi/sc-4-a-156126/default.aspx http://www.zive.cz/default.aspx?article=156126 <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 ... Mon, 7 Mar 2011 17:01:00 GMT

25.2.2011

strana 4

Vytvoření modelu http://www.zive.cz/bleskovky/western-digital-zaplati-43miliardy-dolaru-za-vyrobu-disku-hitachi/sc-4-a-156126/default.aspx <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 ... Mon, 7 Mar 2011 17:01:00 GMT

25.2.2011

strana 5

XML parser •  SAX –  Simple API for XML •  DOM –  Document Object Model

25.2.2011

strana 6

RSSProcessor.h Protokol - (void) parseRSSFeedAtUrl:(NSString*)urlAddress;

25.2.2011

strana 7

RSSProcessor.h id delegate; NSXMLParser * rssParser; NSMutableArray * stories; NSMutableDictionary * item; NSString * currentElement; NSMutableString * currentTitle, * currentDate, * currentSummary, * currentLink;

25.2.2011

strana 8

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

25.2.2011

strana 9

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

25.2.2011

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]; }

25.2.2011

strana 11

RSSProcessor.m - (void)parser:(NSXMLParser *)parser parseErrorOccurred: (NSError *)parseError { NSLog(@"error parsing XML"); }

25.2.2011

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]; } }

25.2.2011

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); } }

25.2.2011

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]; } }

25.2.2011

strana 15

RSSProcessor.m - (void)parserDidEndDocument:(NSXMLParser *) parser { NSLog(@"all done!"); [delegate setItems:stories]; [[_delegate tableView] reloadData]; }

25.2.2011

strana 16

Zobrazení výsledku

25.2.2011

strana 17

MainWindow.xib •  Nadpis –  RSS Lesson

25.2.2011

strana 18

RootViewController.xib •  UITableView

25.2.2011

strana 19

RootViewController.h NSArray *items; @property (nonatomic, copy) NSArray *items;

25.2.2011

strana 20

RootViewController.m @synthesize items;

25.2.2011

strana 21

RootViewController.m - (NSInteger)tableView:(UITableView *) tableView numberOfRowsInSection: (NSInteger)section return [items count];

25.2.2011

strana 22

RootViewController.m - (UITableViewCell *)tableView:(UITableView *) tableView cellForRowAtIndexPath:(NSIndexPath *) indexPath [cell.textLabel setText:[[items objectAtIndex:indexPath.row] valueForKey:@"title"]];

25.2.2011

strana 23

RootViewController.m - (void)viewDidLoad items = nil; RSSProcessor *rssProcessor = [[[RSSProcessor alloc] initWithDelegate:self] autorelease]; [rssProcessor parseRSSFeedAtUrl:@"http:// www.zive.cz/system/RSS.xml"]; //#import "RSSPRocessor.h"

25.2.2011

strana 24

Protokol •  Lepší řešení •  Model musí mít znalost controlleru

25.2.2011

strana 25

ItemProtocol.h @protocol ItemProtocol - (void) updateItemSource:(NSArray*)itemArray; @end

25.2.2011

strana 26

RSSProcessor.h #import "ItemProtocol.h" id delegate; @property (retain) id delegate;

//@synthesize

25.2.2011

strana 27

RootViewController.h #import "ItemProtocol.h" @interface RootViewController : UITableViewController

25.2.2011

strana 28

RSSProcessor.m - (void)parserDidEndDocument:(NSXMLParser *) parser { NSLog(@"all done!"); [delegate updateItemSource:stories]; }

25.2.2011

strana 29

RootViewController - (void) updateItemSource:(NSArray*)itemArray { [self setItems:itemArray]; [[self tableView] reloadData]; }

25.2.2011

strana 30

Zobrazení detailu? •  Přejdeme na web

25.2.2011

strana 31

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

25.2.2011

strana 32

WebController.h Protokol IBOutlet UIWebView *_webView; NSString *urlAddress; @property (nonatomic, copy) NSString *urlAddress;

25.2.2011

strana 33

WebController.m •  @synthesize urlAddress;

25.2.2011

strana 34

WebController.m - (void)viewDidLoad self.title = @"Web";

25.2.2011

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]; }

25.2.2011

strana 36

WebController.m - (void)viewWillDisappear:(BOOL)animated{ NSURL *url = [NSURL URLWithString:@"about:blank"]; NSURLRequest *request = [NSURLRequest requestWithURL:url]; [_webView loadRequest:request]; }

25.2.2011

strana 37

Zobrazený web

25.2.2011

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];

25.2.2011

strana 39

Web na celou obrazovku [_webView setScalesPageToFit:YES];

25.2.2011

strana 40

StatusBar – indikátor načítání

25.2.2011

strana 41

WebController.m - (void)webViewDidStartLoad:(UIWebView *)webView { UIApplication* app = [UIApplication sharedApplication]; app.networkActivityIndicatorVisible = YES; }

25.2.2011

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; }

25.2.2011

strana 43

Rychlé zobrazení detailu

25.2.2011

strana 44

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

25.2.2011

strana 45

DetailViewController.h IBOutlet UILabel *titleLabel; IBOutlet UILabel *timeLabel; IBOutlet UITextView *textView; NSString *url;

@property (nonatomic, retain) IBOutlet UILabel *titleLabel; @property (nonatomic, retain) IBOutlet UILabel *timeLabel; @property (nonatomic, retain) IBOutlet UITextView *textView; @property (nonatomic, retain) NSString *url;

25.2.2011

strana 46

DetailViewController.h @synthesize titleLabel, timeLabel, textView, url;

25.2.2011

strana 47

DetailViewController.m - (void)viewDidLoad self.title = @"RSS Detail";

25.2.2011

strana 48

DetailViewController.h IBOutlet UILabel *titleLabel; IBOutlet UILabel *timeLabel; IBOutlet UITextView *textView; NSString *url;

@property (nonatomic, retain) IBOutlet UILabel *titleLabel; @property (nonatomic, retain) IBOutlet UILabel *timeLabel; @property (nonatomic, retain) IBOutlet UITextView *textView; @property (nonatomic, retain) NSString *url;

25.2.2011

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]; }

25.2.2011

strana 50

Rychlé zobrazení detailu

25.2.2011

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];

25.2.2011

strana 52

Více RSS zdrojů? RootViewController.m RSSProcessor *secondRssProcessor = [[[RSSProcessor alloc] initWithDelegate:self] autorelease]; [secondRssProcessor parseRSSFeedAtUrl:@"http:// www.ceskenoviny.cz/sluzby/rss/index.php"];

25.2.2011

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]; }

25.2.2011

strana 54

Děkuji za pozornost!