我是相当新的 iPhone 开发，我有一个问题。经过几个小时的搜索和挖掘代码，我可以理解问题的根源（希望）但不知道如何解决它。问题是 tableView 单元在解析器完成之前加载，因此“[array count]”为 nil。当我手动设置“部分中的行数”时，表格确实出现了，但只是在几秒钟后上下滚动。
我有 2 个类，一个用于 XMLParser，一个用于显示 tableView。根据我在打开这个问题之前读到的内容，我需要重新加载 tavleview 数据，但因为我有 2 个不同的类，我不知道该怎么做。有任何想法吗？
非常感谢！
这是我的 XMLParser 代码：
- (void)parserDidStartDocument:(NSXMLParser *)parser
{
self.titles = [[NSMutableArray alloc]init];
self.descriptions = [[NSMutableArray alloc]init];
self.links = [[NSMutableArray alloc]init];
self.pubDate = [[NSMutableArray alloc]init];
}
- (void)parserDidEndDocument:(NSXMLParser *)parser
{
}
BOOL isItem = NO;
BOOL isTitle = NO;
BOOL isDesription = NO;
BOOL isImg = NO;
BOOL isPubDate = NO;
- (void)parser:(NSXMLParser *)parser didStartElement:(NSString *)elementName namespaceURI:(NSString *)namespaceURI qualifiedName:(NSString *)qName attributes:(NSDictionary *)attributeDict
{
if ([elementName isEqualToString:@"item"]) {
isItem = YES;
}
if ([elementName isEqualToString:@"title"]) {
isTitle=YES;
self.titlesString = [[NSMutableString alloc]init];
}
if ([elementName isEqualToString:@"description"]) {
isDesription = YES;
self.descriptionString = [[NSMutableString alloc]init];;
self.data = [NSMutableData data];
}
if ([elementName isEqualToString:@"pubDate"]) {
isPubDate = YES;
self.pubDateString = [[NSMutableString alloc]init];
}
}
- (void)parser:(NSXMLParser *)parser foundCharacters:(NSString *)string{
if(isItem && isTitle){
[self.titlesString appendString:string];
}
if (isItem && isDesription) {
[self.descriptionString appendString:string];
}
if (isItem && isPubDate) {
[self.pubDateString appendString:string];
}
}
- (void)parser:(NSXMLParser *)parser foundCDATA:(NSData *)CDATABlock
{
if (self.data)
[self.data appendData:CDATABlock];
}
- (void)parser:(NSXMLParser *)parser didEndElement:(NSString *)elementName namespaceURI:(NSString *)namespaceURI qualifiedName:(NSString *)qName
{
if ([elementName isEqualToString:@"item"]) {
isItem = NO;
[self.titles addObject:self.titlesString];
[self.descriptions addObject:self.descriptionString];
[self.pubDate addObject:self.pubDateString];
NSLog(@"%@,%@,%@,",self.titlesString,self.descriptionString,self.pubDate);
}
if ([elementName isEqualToString:@"title"]) {
isTitle=NO;
}
if ([elementName isEqualToString:@"description"]) {
isDesription = NO;
if ([self.data length] > 0)
{
NSString *htmlSnippet = [[NSString alloc] initWithData:self.data encoding:NSUTF8StringEncoding];
NSString *imageSrc = [self firstImgUrlString:htmlSnippet];
[self.links addObject:imageSrc];
}
self.data = nil;
}
if([elementName isEqualToString:@"pubDate"])
isPubDate = NO;
}
- (NSString *)firstImgUrlString:(NSString *)string
{
NSError *error = NULL;
NSRegularExpression *regex = [NSRegularExpression regularExpressionWithPattern:@"(<img\\s[\\s\\S]*?src\\s*?=\\s*?['\"](.*?)['\"][\\s\\S]*?>)+?"
options:NSRegularExpressionCaseInsensitive
error:&error];
NSTextCheckingResult *result = [regex firstMatchInString:string
options:0
range:NSMakeRange(0, [string length])];
if (result)
return [string substringWithRange:[result rangeAtIndex:2]];
return nil;
}
这是我的 show tableView 代码：
- (void)viewDidLoad
{
[super viewDidLoad];
self.navigationItem.leftBarButtonItem = [[UIBarButtonItem alloc] initWithImage:[UIImage imageNamed:@"menuButton.png"] style:UIBarButtonItemStyleBordered target:self.viewDeckController action:@selector(toggleLeftView)];
NSURL *url;
if (!self.isGetLink)
url = [NSURL URLWithString:@"http://www.ynet.co.il/Integration/StoryRss2.xml"];
else
url = [NSURL URLWithString:self.linkForParsingString];
if (!self.xmlParser) {
self.xmlParser = [[XMLparser alloc]init];
[self.xmlParser LoadXMLWithURl:url];
}
self.isGetLink = NO;
}
- (void)didReceiveMemoryWarning
{
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
#pragma mark - Table view data source
- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
{
// Return the number of sections.
return 1;
}
- (void)registerNib:(UINib *)nib forCellReuseIdentifier:(NSString *)identifier
{
}
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
// Return the number of rows in the section.
return [self.xmlParser.titles count];
}
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
static NSString *CellIdentifier = @"CustomCell";
CustomCell *cell = (CustomCell*) [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
if (cell == nil)
{
NSArray *nib = [[NSBundle mainBundle] loadNibNamed:@"CustomCell" owner:self options:nil];
cell = [nib objectAtIndex:0];
}
cell.lblTitle.text = [self.xmlParser.titles objectAtIndex:indexPath.row];
cell.lblTitle.font = [UIFont boldSystemFontOfSize:[UIFont systemFontSize]];
NSData *data = [NSData dataWithContentsOfURL:[NSURL URLWithString:[self.xmlParser.links objectAtIndex:indexPath.row]]];
cell.imgView.image = [UIImage imageWithData:data];
return cell;
}
- (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath
{
return 82;
}
#pragma mark - Table view delegate
NSString *curnentDes;
NSString *currentTitle;
NSString *currentPubDate;
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
ReadViewController *rvc = [[ReadViewController alloc]initWithNibName:@"ReadViewController" bundle:nil];
curnentDes = [self.xmlParser.descriptions objectAtIndex:indexPath.row];
currentTitle = [self.xmlParser.titles objectAtIndex:indexPath.row];
currentPubDate = [self.xmlParser.pubDate objectAtIndex:indexPath.row];
NSDateFormatter *inputFormatter = [[NSDateFormatter alloc]init];
[inputFormatter setDateFormat:@"EEE, dd MMM yyyy HH:mm:ss Z"];
NSDate *inputDate = [inputFormatter dateFromString:currentPubDate];
NSDateFormatter *outputFormatter = [[NSDateFormatter alloc]init];
[outputFormatter setDateFormat:@"dd/MM/yyyy HH:mm"];
NSString *outputDate = [outputFormatter stringFromDate:inputDate];
rvc.description = curnentDes;
rvc.stitle = currentTitle;
rvc.pubDate = outputDate;
[self.navigationController pushViewController:rvc animated:YES];
}