我是iPhone应用程序开发的新手。我想找出为什么tableview单元格没有显示数据。我尝试了很多方法。我在下面给出我的代码。
请注意，我在我的控制台上看到的数据来自XML文件，但它没有显示在UITableView单元格中。
@synthesize newsTable;
@synthesize activityIndicator;
@synthesize rssParser;
@synthesize stories;
@synthesize item;
@synthesize currentElement;
@synthesize currentTitle, currentDate, currentSummary, currentLink;
// The designated initializer. Override if you create the controller programmatically and want to perform customization that is not appropriate for viewDidLoad.
/*
- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil {
self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
if (self) {
// Custom initialization.
}
return self;
}
*/
#pragma mark -
#pragma mark Parsing
// Implement viewDidLoad to do additional setup after loading the view, typically from a nib.
- (void)viewDidLoad {
[super viewDidLoad];
}
- (void)viewDidAppear:(BOOL)animated
{
[super viewDidAppear:animated];
if ([stories count] == 0) {
NSString * path = @"http://icms7.bitmascot.com:8080/webcommander2.0S2/rest/services/catalogue/getAllDummyCategoryProduct";
[self parseXMLFileAtURL:path];
}
cellSize = CGSizeMake([newsTable bounds].size.width, 60);
}
- (void)parseXMLFileAtURL:(NSString *)URL
{
stories = [[NSMutableArray alloc] init];
//you must then convert the path to a proper NSURL or it won't work
NSURL *xmlURL = [NSURL URLWithString:URL];
// here, for some reason you have to use NSClassFromString when trying to alloc NSXMLParser, otherwise you will get an object not found error
// this may be necessary only for the toolchain
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];
// Depending on the XML document you're parsing, you may want to enable these features of NSXMLParser.
[rssParser setShouldProcessNamespaces:NO];
[rssParser setShouldReportNamespacePrefixes:NO];
[rssParser setShouldResolveExternalEntities:NO];
[rssParser parse];
}
- (void)parserDidStartDocument:(NSXMLParser *)parser
{
NSLog(@"found file and started parsing");
}
- (void)parser:(NSXMLParser *)parser parseErrorOccurred:(NSError *)parseError
{
NSString * errorString = [NSString stringWithFormat:@"Unable to download story feed from web site (Error code %i )", [parseError code]];
NSLog(@"error parsing XML: %@", errorString);
UIAlertView * errorAlert = [[UIAlertView alloc] initWithTitle:@"Error loading content" message:errorString delegate:self cancelButtonTitle:@"OK" otherButtonTitles:nil];
[errorAlert show];
}
- (void)parser:(NSXMLParser *)parser didStartElement:(NSString *)elementName namespaceURI:(NSString *)namespaceURI qualifiedName:(NSString *)qName attributes:(NSDictionary *)attributeDict{
NSLog(@"found this element: %@", elementName);
currentElement = [elementName copy];
if ([elementName isEqualToString:@"ProductData"])
{
// 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];
}
}
- (void)parser:(NSXMLParser *)parser didEndElement:(NSString *)elementName namespaceURI:(NSString *)namespaceURI qualifiedName:(NSString *)qName{
//NSLog(@"ended element: %@", elementName);
if ([elementName isEqualToString:@"ProductData"])
{ // save values to an item, then store that item into the array...
[item setObject:currentTitle forKey:@"id"];
[item setObject:currentLink forKey:@"productNumber"];
[item setObject:currentSummary forKey:@"name"];
[item setObject:currentDate forKey:@"dateCreated"];
[stories addObject:[item copy]];
NSLog(@"adding story: %@", currentTitle);
}
}
- (void)parser:(NSXMLParser *)parser foundCharacters:(NSString *)string{
NSLog(@"found characters: %@", string);
// save the characters for the current item...
if ([currentElement isEqualToString:@"ProductData"])
{
[currentTitle appendString:string];
}
else if ([currentElement isEqualToString:@"id"])
{
[currentLink appendString:string];
}
else if ([currentElement isEqualToString:@"ProductNumber"])
{
[currentSummary appendString:string];
}
else if ([currentElement isEqualToString:@"dateCreatrd"])
{
[currentDate appendString:string];
}
}
- (void)parserDidEndDocument:(NSXMLParser *)parser {
[activityIndicator stopAnimating];
[activityIndicator removeFromSuperview];
NSLog(@"all done!");
NSLog(@"stories array has %d items", [stories count]);
NSLog(@"data in stories: %@",[stories description]);
[newsTable reloadData];
}
#pragma mark tableView
- (NSInteger)tableView:(UITableView*)tableView numberOfRowsInSection:(NSInteger)section
{
return [stories count];
}
- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView;
{
return 1;
}
- (UITableViewCell *)tableView:(UITableView *)tv cellForRowAtIndexPath:(NSIndexPath *)indexPath {
static NSString *MyIdentifier = @"MyIdentifier";
UITableViewCell *cell = [tv dequeueReusableCellWithIdentifier:MyIdentifier];
if (cell == nil)
{
cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleSubtitle reuseIdentifier: MyIdentifier];
}
// Set up the cell
int storyIndex = [indexPath indexAtPosition: [indexPath length] - 1];
//[cell setText:[[stories objectAtIndex: storyIndex] objectForKey: @"title"]];
//[cell setLabelText:[[stories objectAtIndex:storyIndex] objectForKey: @"ProductData"]];
//[cell setText:[stories objectAtIndex:storyIndex]];
cell.textLabel.text = [stories objectAtIndex:storyIndex];
NSLog(@"%@ ",cell.textLabel.text);
//cell.detailTextLabel.text = [stories objectAtIndex:indexPath.row];
return cell;
}
/*
- (void)setLabelText:(NSString *)_text{
UILabel *cellText;
cellText.text= _text;
[cellText sizeToFit];
}
*/
/*
// Override to allow orientations other than the default portrait orientation.
- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation {
// Return YES for supported orientations.
return (interfaceOrientation == UIInterfaceOrientationPortrait);
}
*/
- (void)didReceiveMemoryWarning {
// Releases the view if it doesn't have a superview.
[super didReceiveMemoryWarning];
// Release any cached data, images, etc. that aren't in use.
}
- (void)viewDidUnload {
[super viewDidUnload];
// Release any retained subviews of the main view.
// e.g. self.myOutlet = nil;
}
- (void)dealloc {
[currentElement release];
[rssParser release];
[stories release];
[item release];
[currentTitle release];
[currentDate release];
[currentSummary release];
[currentLink release];
[super dealloc];
}
@end
尝试设置属性textLabel的值，而不是detailedTextLabel：
cell.textLabel.text = [[stories objectAtIndex:storyIndex] valueForKey:@"productNumber"];
还尝试使用预定义样式创建cell：
cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleSubtitle reuseIdentifier: MyIdentifier];
要制作一个你应该使用的单元格
- (id)initWithStyle:(UITableViewCellStyle)style reuseIdentifier:(NSString *)reuseIdentifier
方法。默认情况下，detailTextLabel在单元格中不可见。尝试使用其他样式 - 例如UITableViewCellStyleValue1。
而不是给予，
int storyIndex = [indexPath indexAtPosition: [indexPath length] - 1];
//[cell setText:[[stories objectAtIndex: storyIndex] objectForKey: @"title"]];
//[cell setLabelText:[[stories objectAtIndex:storyIndex] objectForKey: @"ProductData"]];
//[cell setText:[stories objectAtIndex:storyIndex]];
cell.detailTextLabel.text = [stories objectAtIndex:storyIndex];
试试这段代码：
cell.detailTextLabel.text = [stories objectAtIndex:indexPath.row];
在此之前，只检查你的阵列（故事）有内容？
谢谢..
cell.detailTextLabel.text = [stories objectAtIndex:storyIndex];
用以下陈述取代上述陈述，我认为这将有效
cell.detailTextLabel.text = [stories objectAtIndex:indexPath.row];