RSS源不会加载

我有一个表格显示来自RSS源的数据，只要它不是我的应用程序的根视图，它就可以正常工作。我总是通过按下一个按钮来显示它，但现在我想让它成为用户看到的第一个视图，但活动指示器只是保持旋转，并且内容不会加载。正如我所说的，当我将它从按钮上推到导航堆栈上时，它会加载内容，所以我不确定它为什么在显示的第一个视图时无法加载。RSS源不会加载

的AppDelegate

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions 
{ 
    self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]]; 
    AgStoriesViewController *rootView = [[AgStoriesViewController alloc] initWithNibName:nil bundle:nil]; 
     WebViewController *wvc = [[WebViewController alloc]init]; 
     [rootView setWebViewController:wvc]; 

     KFBNavControllerViewController *navController = [[KFBNavControllerViewController alloc] initWithRootViewController:rootView]; 
     navController.delegate = rootView; 
    self.window.rootViewController = navController; 
    [self.window makeKeyAndVisible]; 
}

的TableView与RSS

#import "AgStoriesViewController.h" 
#import "RSSChannel.h" 
#import "RSSItem.h" 
#import "WebViewController.h" 
#import "DTCustomColoredAccessory.h" 
#import "UIImage+ImageEffects.h" 
#import "UIView+Borders.h" 
#import "TSMessage.h" 
#import "TSMessageView.h" 
#import "ArticleCell.h" 
#import "KFBAppDelegate.h" 
#import "MenuTableViewController.h" 

@implementation AgStoriesViewController 
{ 
    UIActivityIndicatorView *loadingIndicator; 
} 

@synthesize webViewController, blurredView, contentView, menuShown; 

- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil 
{ 
    self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil]; 
    if (self) 
    { 
     self.navigationController.delegate = self; 
    } 
    return self; 
} 

- (void)viewDidLoad 
{ 
    menuShown = NO; 

    UIImage *background = [UIImage imageNamed:@"sunset"]; 
    UIImageView *backgroundImageView = [[UIImageView alloc]initWithImage:background]; 

    CGFloat width = CGRectGetWidth(self.view.bounds); 
    CGFloat height = CGRectGetHeight(self.view.bounds); 

    self.tableView = [[UITableView alloc] initWithFrame:CGRectZero style:UITableViewStyleGrouped]; 
    self.tableView.backgroundView = backgroundImageView; 

    self.title = @"Ag News"; 

    if ([[UIDevice currentDevice] userInterfaceIdiom] == UIUserInterfaceIdiomPhone) 
    { 
     UIImage *hamburgerButton = [UIImage imageNamed:@"list_button"]; 
     UIBarButtonItem *listButton = [[UIBarButtonItem alloc]initWithImage:hamburgerButton style:UIBarButtonItemStyleBordered target:self action:@selector(showMenu)]; 
     self.navigationItem.leftBarButtonItem = listButton; 
    } 

    if ([[UIDevice currentDevice] userInterfaceIdiom] == UIUserInterfaceIdiomPhone) 
    { 
     loadingIndicator = [[UIActivityIndicatorView alloc]initWithFrame:CGRectMake(width/2, height/2, 37, 37)]; 
     loadingIndicator.center = CGPointMake(width/2, height/2 - 37); 
    } 
    else 
    { 
     loadingIndicator = [[UIActivityIndicatorView alloc]initWithFrame:CGRectMake(142, 365, 37, 37)]; 
    } 

    loadingIndicator.activityIndicatorViewStyle = UIActivityIndicatorViewStyleWhiteLarge; 
    loadingIndicator.hidesWhenStopped = YES; 
    [self.tableView addSubview:loadingIndicator]; 
    [loadingIndicator startAnimating]; 
} 

- (void)showMenu 
{ 
    if (!menuShown) 
    { 
     CGRect screenRect = [[UIScreen mainScreen] bounds]; 
     CGFloat screenWidth = screenRect.size.width; 
     CGFloat screenHeight = screenRect.size.height; 

     UIColor *kfbBlue = [UIColor colorWithRed:8.0/255.0f green:77.0/255.0f blue:139.0/255.0f alpha:1]; 

     contentView = [[UIView alloc]initWithFrame:self.tableView.bounds]; 
     contentView.autoresizesSubviews = YES; 
     contentView.autoresizingMask = (UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleHeight); 
     contentView.backgroundColor = [UIColor clearColor]; 

     blurredView = [[UIToolbar alloc]initWithFrame:CGRectMake(0, 0, screenWidth, screenHeight)]; 
     [blurredView setBarStyle:UIBarStyleBlack]; 
     [blurredView setBarTintColor:kfbBlue]; 

     MenuTableViewController *menu = [[MenuTableViewController alloc]initWithNibName:@"MenuTableViewController" bundle:nil]; 
     menu.view.frame = CGRectMake(0, 0, screenWidth, screenHeight - 50); 
     [self.view addSubview:contentView]; 
     [contentView addSubview:blurredView]; 
     [self addChildViewController:menu]; 
     [contentView addSubview:menu.view]; 
     self.tableView.scrollEnabled = NO; 
     menuShown = YES; 
    } 
    else if (menuShown) 
    { 
     [contentView removeFromSuperview]; 
     [blurredView removeFromSuperview]; 
     self.navigationController.navigationBarHidden = NO; 
     self.tableView.scrollEnabled = YES; 
     menuShown = NO; 
    } 
} 

- (void)closeMenu 
{ 
    [contentView removeFromSuperview]; 
    self.navigationController.navigationBarHidden = NO; 
    self.tableView.scrollEnabled = YES; 
} 

- (void)viewDidDisappear:(BOOL)animated 
{ 
    [loadingIndicator stopAnimating]; 
} 

- (void)parser:(NSXMLParser *)parser didStartElement:(NSString *)elementName namespaceURI:(NSString *)namespaceURI qualifiedName:(NSString *)qName attributes:(NSDictionary *)attributeDict 
{ 
    NSLog(@"%@ found a %@ element", self, elementName); 
    if ([elementName isEqual:@"channel"]) 
    { 
     channel = [[RSSChannel alloc]init]; 

     [channel setParentParserDelegate:self]; 


     [parser setDelegate:channel]; 
    } 
} 

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section 
{ 
    NSLog(@"channel items %lu", (unsigned long)[[channel items]count]); 
    return [[channel items]count]; 
} 

- (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath 
{ 
    return 215; 
} 

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath 
{ 
    RSSItem *item = [[channel items]objectAtIndex:[indexPath row]]; 

    ArticleCell *cell = [tableView dequeueReusableCellWithIdentifier:@"articleCell"]; 
    if (!cell) 
    { 
     NSArray *nibs =[[NSBundle mainBundle] loadNibNamed:@"ArticleCell" owner:self options:NULL]; 
     cell = [nibs firstObject]; 
    } 
    cell.articleTitle.text = [item title]; 
    cell.articleDescription.text = [item infoString]; 

    cell.articleTitle.textColor = [UIColor whiteColor]; 
    cell.articleDescription.textColor = [UIColor whiteColor]; 
    cell.articleTitle.font = [UIFont fontWithName:@"FranklinGothicStd-ExtraCond" size:22.0]; 
    cell.articleDescription.font = [UIFont fontWithName:@"FranklinGothicStd-ExtraCond" size:16.0]; 
    cell.backgroundColor = [UIColor clearColor]; 

    return cell; 
} 

- (void)fetchEntries 
{ 

    xmlData = [[NSMutableData alloc]init]; 


    NSURL *url = [NSURL URLWithString:@"http://kyfbnewsroom.com/category/ag-news/feed"]; 


    NSURLRequest *req = [NSURLRequest requestWithURL:url]; 


    connection = [[NSURLConnection alloc]initWithRequest:req delegate:self startImmediately:YES]; 
} 

- (id)initWithStyle:(UITableViewStyle)style 
{ 
    self = [super initWithStyle:style]; 

    if (self) 
    { 
     [self fetchEntries]; 
    } 

    return self; 
} 

- (void)connection:(NSURLConnection *)conn didReceiveData:(NSData *)data 
{ 
    [xmlData appendData:data]; 
} 

- (void)connectionDidFinishLoading:(NSURLConnection *)conn 
{ 
    [loadingIndicator stopAnimating]; 

    UIImage *background = [UIImage imageNamed:@"sunset"]; 
    UIImage *effectImage = [background applyDarkEffect]; 
    UIImageView *blurredBackground = [[UIImageView alloc]init]; 
    blurredBackground.image = effectImage; 
    self.tableView.backgroundView = blurredBackground; 

    // Create the parser object with the data received from the web service 
    NSXMLParser *parser = [[NSXMLParser alloc]initWithData:xmlData]; 

    // Give it a delegate 
    [parser setDelegate:self]; 

    //Tell it to start parsing - the document will be parsed and the delegate of NSXMLParser will get all of its delegate messages sent to it before this line finishes execution - it is blocking 
    [parser parse]; 

    // Get rid of the XML data as we no longer need it 
    xmlData = nil; 

    NSMutableArray *actionAlerts = [NSMutableArray array]; 
    for (RSSItem *object in channel.items) 
    { 
     if (object.isActionAlert) 
     { 
      [actionAlerts addObject:object]; 
     } 
    } 

    for (RSSItem *object in actionAlerts) 
    { 
     [channel.items removeObject:object]; 
    } 

    // Reload the table 
    [[self tableView]reloadData]; 

    NSLog(@"%@\n %@\n %@\n", channel, [channel title], [channel infoString]); 
} 

- (void)connection:(NSURLConnection *)conn didFailWithError:(NSError *)error 
{ 
    // Release the connection object, we're done with it 
    connection = nil; 

    // Release the xmlData object, we're done with it 
    xmlData = nil; 

    [loadingIndicator stopAnimating]; 

    // Grab the description of the error object passed to us 
    NSString *errorString = [NSString stringWithFormat:@"Fetch failed: %@", [error localizedDescription]]; 

    // Create and show an alert view with this error displayed 
    // UIAlertView *av = [[UIAlertView alloc]initWithTitle:@"Error" message:errorString delegate:nil cancelButtonTitle:@"OK" otherButtonTitles:nil]; 
    // [av show]; 

    [TSMessage showNotificationWithTitle:@"Network Error" subtitle:errorString type:TSMessageNotificationTypeError]; 
} 

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath 
{ 
    if ([[UIDevice currentDevice] userInterfaceIdiom] == UIUserInterfaceIdiomPhone) 
    { 
     [[webViewController webView]loadRequest:[NSURLRequest requestWithURL:[NSURL URLWithString:@"about:blank"]]]; 

     [self.navigationController pushViewController:webViewController animated:YES]; 

     RSSItem *entry = [[channel items]objectAtIndex:[indexPath row]]; 

     NSURL *url = [NSURL URLWithString:[entry link]]; 

     NSURLRequest *req = [NSURLRequest requestWithURL:url]; 

     [[webViewController webView]loadRequest:req]; 
     webViewController.hackyURL = url; 
    } 
    else 
    { 
     [[webViewController webView]loadRequest:[NSURLRequest requestWithURL:[NSURL URLWithString:@"about:blank"]]]; 

     NSMutableArray *details = [self.splitViewController.viewControllers mutableCopy]; 

     UINavigationController *detailNav = [[UINavigationController alloc]initWithRootViewController:webViewController]; 

     [details replaceObjectAtIndex:1 withObject:detailNav]; 

     KFBAppDelegate *appDelegate = (KFBAppDelegate *)[[UIApplication sharedApplication]delegate]; 
     appDelegate.splitViewController.viewControllers = details; 
     appDelegate.window.rootViewController = self.splitViewController; 
     appDelegate.splitViewController.delegate = webViewController; 
     [appDelegate.splitViewController viewWillAppear:YES]; 

     // Grab the selected item 
     RSSItem *entry = [[channel items]objectAtIndex:[indexPath row]]; 

     // Construct a URL with the link string of the item 
     NSURL *url = [NSURL URLWithString:[entry link]]; 

     // Construct a request object with that URL 
     NSURLRequest *req = [NSURLRequest requestWithURL:url]; 

     // Load the request into the web view 
     [[webViewController webView]loadRequest:req]; 
     webViewController.hackyURL = url; 

     // Set the title of the web view controller's navigation item 
     [[webViewController navigationItem]setTitle:[entry title]]; 
    } 
} 

@end

来源

2014-07-01 raginggoat

使用此方法重新加载表数据 -

- (void)parserDidEndDocument:(NSXMLParser *)parser 
{ 
    [[self tableView]reloadData]; 
}

这种方法被称为完成XML文档的解析时，。当数据未正确设置在数组中时，您正在重新加载表，因此它会显示空表。

编辑 - 在视图上正确调用连接方法初始化。

fetchEntries需要在viewDidLoad中调用。

来源

2014-07-01 17:35:12 rishi

该方法不能解决它。另外，没有这种方法，它工作得很好，如果我推视图控制器到导航堆栈 – raginggoat

你的tableview数据源和委托定义在哪里，它不是那些设置？你也可以在cellForRow方法中放置断点，并检查那里的项目的值是什么？ – rishi

它看起来像connectionDidFinishLoading永远不会被调用，因为加载指标永远不会停止旋转。直到我将其作为应用程序显示的第一个视图之前，我从未遇到过任何问题。 – raginggoat

RSS源不会加载

回答

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