我有很多博客应用。最近，他们中的一些人开始遇到一些问题。我使用ASIHTTP Classes和GDataXML Classes来解析wordpress feed的xml，并将每个项目（文章）放入一个可变数组中。然后，tableview应该将所有故事加载到每个文章的单元格中。我遇到的问题是第一次运行时没有显示新文章，用户必须拉到刷新，然后显示新文章。我刚刚在应用程序上运行了测试。这篇文章是在几小时前发布的。我运行了应用程序，它不在那里。它显示了拉动刷新。完全关闭应用程序，重新启动它，它又消失了。以下是TableView实现中的代码：
@implementation RootViewController
- (void)refresh {
self.allEntries = [NSMutableArray array];
self.queue = [[[NSOperationQueue alloc] init] autorelease];
self.feeds = [NSArray arrayWithObjects:@"http://bubblycandacebabbles.wordpress.com/?cat=-2008&feed=rss2",
nil];
for (NSString *feed in _feeds) {
NSURL *url = [NSURL URLWithString:feed];
ASIHTTPRequest *request = [ASIHTTPRequest requestWithURL:url];
[request setDelegate:self];
[_queue addOperation:request];
}
}
- (void)viewDidLoad {
[super viewDidLoad];
[activity startAnimating];
//[self.navigationController.navigationBar setBackgroundImage:[UIImage imageNamed:@"navbarcopy.png"] forBarMetrics:UIBarMetricsDefault];
self.title = @"Blog";
CGFloat nRed=111.0/255.0;
CGFloat nBlue=209/255.0;
CGFloat nGreen=229.0/255.0;
UIColor *myColor=[[UIColor alloc]initWithRed:nRed green:nBlue blue:nGreen alpha:1];
UIBarButtonItem *font = [[UIBarButtonItem alloc] initWithTitle:@"Change Font Size" style:UIBarButtonItemStylePlain target:self action:@selector(fontsizes)];
self.navigationController.navigationItem.rightBarButtonItem = font;
self.tableView.backgroundColor = myColor;
self.refreshControl = [[UIRefreshControl alloc] init];
[self.refreshControl addTarget:self action:@selector(refreshInvoked:forState:) forControlEvents:UIControlEventValueChanged];
[self refresh];
}
-(void) refreshInvoked:(id)sender forState:(UIControlState)state {
// Refresh table here...
[_allEntries removeAllObjects];
[self.tableView reloadData];
[self refresh];
}
- (void)parseRss:(GDataXMLElement *)rootElement entries:(NSMutableArray *)entries {
NSArray *channels = [rootElement elementsForName:@"channel"];
for (GDataXMLElement *channel in channels) {
NSString *blogTitle = [channel valueForChild:@"title"];
NSArray *items = [channel elementsForName:@"item"];
for (GDataXMLElement *item in items) {
NSString *articleTitle = [item valueForChild:@"title"];
NSString *articleUrl = [item valueForChild:@"link"];
NSString *articleDateString = [item valueForChild:@"pubDate"];
NSDate *articleDate = [NSDate dateFromInternetDateTimeString:articleDateString formatHint:DateFormatHintRFC822];
NSString *articleImage = [item valueForChild:@"content:encoded"];
NSScanner *theScanner;
NSString *gt =nil;
theScanner = [NSScanner scannerWithString:articleImage];
NSString *comments = [articleUrl stringByAppendingString:@"#respond"];
NSString *commentslink = [NSString stringWithFormat: @"<a href=\"%@\">Leave A Comment</a>",comments];
// find start of tag
[theScanner scanUpToString:@"alt=\"\" width=" intoString:NULL] ;
// find end of tag
[theScanner scanUpToString:@"/>" intoString:>] ;
// replace the found tag with a space
//(you can filter multi-spaces out later if you wish)
NSString *test = [articleImage stringByReplacingOccurrencesOfString:[ NSString stringWithFormat:@"%@", gt] withString:@"alt=\"\" width=\"150\" height=\"150\""];
NSString *final = [test stringByReplacingOccurrencesOfString:@"float:none;height:30px" withString:@"float:none;height:1px"];
NSDateFormatter * dateFormatter = [[[NSDateFormatter alloc] init] autorelease];
[dateFormatter setTimeStyle:NSDateFormatterShortStyle];
[dateFormatter setDateStyle:NSDateFormatterShortStyle];
NSString *dateofarticle = [dateFormatter stringFromDate:articleDate];
NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
NSString *smalltitle = [defaults objectForKey:@"Title"];
NSString *smallbody = [defaults objectForKey:@"Article"];
NSString *bodyoftext = [[[[[[[[[[[@"<head><body bgcolor=\"#6fd1e5\" text=\"#CC0099\"><style type='text/css'>a > img {pointer-events: none;cursor: default;max-width: 310;}</style></head><b><font size=" stringByAppendingString: smalltitle ] stringByAppendingString:@"><div align=\"left\"><FONT FACE=\"noteworthy\">" ]stringByAppendingString:articleTitle] stringByAppendingString:@"</font></b><font size=" ] stringByAppendingString:smallbody ] stringByAppendingString:@"><div align=\"left\"><FONT FACE=\"noteworthy\">"] stringByAppendingString:dateofarticle] stringByAppendingString:@"</div></p><FONT FACE=\"noteworthy\">"] stringByAppendingString:final] stringByAppendingString:commentslink]stringByAppendingString:@"</FONT>"];
RSSEntry *entry = [[[RSSEntry alloc] initWithBlogTitle:blogTitle
articleTitle:articleTitle
articleUrl:articleUrl
articleDate:articleDate
articleImage:bodyoftext] autorelease];
[entries addObject:entry];
}
}
}
- (void)parseFeed:(GDataXMLElement *)rootElement entries:(NSMutableArray *)entries {
if ([rootElement.name compare:@"rss"] == NSOrderedSame) {
[self parseRss:rootElement entries:entries];
} else if ([rootElement.name compare:@"feed"] == NSOrderedSame) {
[self parseAtom:rootElement entries:entries];
} else {
NSLog(@"Unsupported root element: %@", rootElement.name);
}
}
// Customize the number of sections in the table view.
- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView {
return 1;
}
// Customize the number of rows in the table view.
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {
return [_allEntries count];
}
// Customize the appearance of table view cells.
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
static NSString *CellIdentifier = @"Cell";
Cell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
if (cell == nil) {
cell = [[Cell alloc] initWithStyle:UITableViewCellStyleSubtitle reuseIdentifier:CellIdentifier];
}
RSSEntry *entry = [_allEntries objectAtIndex:indexPath.row];
NSString *substring = @"http://bubblycandacebabbles.files.wordpress.com";
NSRange textRange = [entry.articleImage rangeOfString:substring];
if(textRange.location != NSNotFound){
NSString *thearticleImage = entry.articleImage;
NSRegularExpression *expression = [NSRegularExpression regularExpressionWithPattern:@"src=\"([^\"]+)\"" options:NSRegularExpressionCaseInsensitive error:NULL];
NSString *someString = thearticleImage;
NSString *oneurl = [someString substringWithRange:[expression rangeOfFirstMatchInString:someString options:NSMatchingCompleted range:NSMakeRange(0, [someString length])]];
NSString *finalstring = [oneurl stringByReplacingOccurrencesOfString:@"src=\"" withString:@""];
NSString *thefinalstring = [finalstring stringByReplacingOccurrencesOfString:@"\"" withString:@""];
NSDateFormatter * dateFormatter = [[[NSDateFormatter alloc] init] autorelease];
[dateFormatter setTimeZone:[NSTimeZone localTimeZone]];
[dateFormatter setTimeStyle:NSDateFormatterShortStyle];
[dateFormatter setDateStyle:NSDateFormatterShortStyle];
CGFloat nRed=204.0/255.0;
CGFloat nBlue=0/255.0;
CGFloat nGreen=153.0/255.0;
UIColor *myColortext=[[UIColor alloc]initWithRed:nRed green:nBlue blue:nGreen alpha:1];
NSString *articleDateString = [dateFormatter stringFromDate:entry.articleDate];
UIFont *cellFont = [UIFont fontWithName:@"noteworthy" size:16];
UIFont *cellFont2 = [UIFont fontWithName:@"noteworthy" size:12];
CALayer * l = [cell.imageView layer];
[l setMasksToBounds:YES];
[l setCornerRadius:11];
[l setBorderWidth:2.0];
[l setBorderColor:[[UIColor blackColor] CGColor]];
cell.textLabel.text = entry.articleTitle;
cell.textLabel.numberOfLines = 2;
cell.detailTextLabel.adjustsFontSizeToFitWidth = YES;
cell.detailTextLabel.text = [NSString stringWithFormat:@"%@ - Mother May I Blog", articleDateString];
cell.textLabel.font = cellFont;
cell.detailTextLabel.font = cellFont2;
cell.textLabel.textColor = myColortext;
cell.detailTextLabel.textColor = myColortext;
[cell.imageView setImageWithURL:[NSURL URLWithString:thefinalstring] placeholderImage:[UIImage imageNamed:@"iphoneicon@2x.png"]];
}
else {
CALayer * l = [cell.imageView layer];
[l setMasksToBounds:YES];
[l setCornerRadius:11];
[l setBorderWidth:2.0];
[l setBorderColor:[[UIColor blackColor] CGColor]];
NSDateFormatter * dateFormatter = [[[NSDateFormatter alloc] init] autorelease];
[dateFormatter setTimeZone:[NSTimeZone localTimeZone]];
[dateFormatter setTimeStyle:NSDateFormatterShortStyle];
[dateFormatter setDateStyle:NSDateFormatterShortStyle];
NSString *articleDateString = [dateFormatter stringFromDate:entry.articleDate];
UIFont *cellFont = [UIFont fontWithName:@"noteworthy" size:16];
UIFont *cellFont2 = [UIFont fontWithName:@"noteworthy" size:12];
cell.imageView.image = [UIImage imageNamed:@"iphoneicon@2x.png"];
cell.textLabel.text = entry.articleTitle;
cell.textLabel.numberOfLines = 2;
cell.detailTextLabel.adjustsFontSizeToFitWidth = YES;
cell.detailTextLabel.text = [NSString stringWithFormat:@"%@ - Mother May I Blog", articleDateString];
CGFloat nRed=204.0/255.0;
CGFloat nBlue=0/255.0;
CGFloat nGreen=153.0/255.0;
UIColor *myColortext=[[UIColor alloc]initWithRed:nRed green:nBlue blue:nGreen alpha:1];
cell.textLabel.font = cellFont;
cell.detailTextLabel.font = cellFont2;
cell.textLabel.textColor = myColortext;
cell.detailTextLabel.textColor = myColortext;
}
return cell;
}
答案 0 :(得分：0)
您需要调用
[self.tableView reloadData];
数据加载完成后的某个时刻。你究竟是如何做到这一点有点棘手，你需要一些方法来告诉你的操作队列是空的。或者，理论上，您可以在队列中的每个操作完成后调用它，这样表将一次填充一个表。如果用户连接速度很慢，这可能会导致问题，因为重新加载表可能会导致用户体验的跳跃，而且我对从另一个线程调用reloadData的线程安全性不肯定