我有一个显示来自RSS提要的数据的tableview，只要它不是我的应用程序的根视图就可以正常工作。我总是通过按下按钮来显示它，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而内容永远不会加载。就像我说的那样，当我从一个按钮将它推到导航堆栈上时，它会加载内容，所以我不确定为什么它在第一个视图时无法加载所示。
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];
}
带RSS的TableView
#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
答案 0 :(得分：1)
使用此方法重新加载表数据 -
- (void)parserDidEndDocument:(NSXMLParser *)parser
{
[[self tableView]reloadData];
}
在解析xml文档完成时调用此方法。当数据未在数组中正确设置时，您正在重新加载表，因此它显示为空表。
编辑 - 在视图初始化时正确调用连接方法。
需要在fetchEntries中调用 viewDidLoad。