iPhone：我卡在我的部分在UITableView，數據來自XMLParser

Question

我是新來這個論壇和iPhone開發。 由於我知道沒有人做iPhone開發，所以我被卡住了，不得不問你們一個解決方案。

我正在製作一個應用程序，從XMLParser獲取數據，並在這些部分的行（段）內爲段（月）內的UITableView提供數據。

當我運行我的腳本時，它不會這樣做。我知道我接近解決方案，但我看不到它。而沒有人來運行我的腳本使其難以調試。

我（演示）XML文件：

<?xml version="1.0" encoding="UTF-8"?> 
    <Stages> 
    <Month id="1" name="January"> 
     <Stage id="1"> 
     <title>Circumference</title> 
     <author>Nicholas Nicastro</author> 
     <summary>Eratosthenes and the Ancient Quest to Measure the Globe.</summary> 
     </Stage> 
     <Stage id="2"> 
     <title>Copernicus Secret</title> 
     <author>Jack Repcheck</author> 
     <summary>How the scientific revolution began</summary> 
     </Stage> 
     <Stage id="3"> 
     <title>Angels and Demons</title> 
     <author>Dan Brown</author> 
     <summary>Robert Langdon is summoned to a Swiss research facility to analyze a cryptic symbol seared into the chest of a murdered physicist.</summary> 
     </Stage> 
    </Month> 
    <Month id="2" name="February"> 
     <Stage id="4"> 
     <title>Keep the Aspidistra Flying</title> 
     <author>George Orwell</author> 
     <summary>A poignant and ultimately hopeful look at class and society, Keep the Aspidistra Flying pays tribute to the stubborn virtues of ordinary people who keep the aspidistra flying.</summary> 
     </Stage> 
    </Month> 
    </Stages> 

我XMLParser的類：

#import <UIKit/UIKit.h> 
@class DAFAppDelegate, Stage, Month; 

@interface XMLParser : NSObject <NSXMLParserDelegate> 
{ 
    NSMutableString *currentElementValue; 
    DAFAppDelegate *appDelegate; 

    Stage *aStage; 
    Month *aMonth; 

} 

- (XMLParser *) initXMLParser; 

@end 


#import "XMLParser.h" 
#import "DAFAppDelegate.h" 
#import "Stage.h" 
#import "Month.h" 

@implementation XMLParser 

- (XMLParser *) initXMLParser 
{ 
    [super init]; 
    appDelegate = (DAFAppDelegate *)[[UIApplication sharedApplication] delegate]; 
    return self; 
} 

- (void)parser:(NSXMLParser *)parser didStartElement:(NSString *)elementName namespaceURI:(NSString *)namespaceURI qualifiedName:(NSString *)qualifiedName attributes:(NSDictionary *)attributeDict 
{ 
    if([elementName isEqualToString:@"Stages"]) 
    { 
     //Initialize the array. 
     appDelegate.stages = [[NSMutableArray alloc] init]; 
    } 
    if([elementName isEqualToString:@"Month"]) 
    { 
     //Initialize the Month. 
     aMonth = [[Month alloc] init]; 

     //Extract the attribute here. 
     aMonth.name = [attributeDict valueForKey:@"name"]; 
     aMonth.monthID = [[attributeDict objectForKey:@"id"] integerValue]; 

     NSLog(@"Reading Month id value :%i", aMonth.monthID); 
     NSLog(@"Reading Month name value :%@", aMonth.name); 
    } 
    if([elementName isEqualToString:@"Stage"]) 
    { 
     //Initialize the Stage. 
     aStage = [[Stage alloc] init]; 

     //Extract the attribute here. 
     aStage.stageID = [[attributeDict objectForKey:@"id"] integerValue]; 

     NSLog(@"Reading id value :%i", aStage.stageID); 
    } 
    NSLog(@"Processing Element: %@", elementName); 
} 

- (void)parser:(NSXMLParser *)parser foundCharacters:(NSString *)string 
{ 
    if(!currentElementValue) 
    { 
     currentElementValue = [[NSMutableString alloc] initWithString:string]; 
    } 
    else 
    { 
     [currentElementValue appendString:string]; 
    } 
    NSLog(@"Processing Value: %@", currentElementValue); 
} 

- (void)parser:(NSXMLParser *)parser didEndElement:(NSString *)elementName namespaceURI:(NSString *)namespaceURI qualifiedName:(NSString *)qName 
{ 
    if([elementName isEqualToString:@"Stages"]) 
    return; 

    //There is nothing to do if we encounter the Stages element here. 
    //If we encounter the Stage element howevere, we want to add the book object to the array 
    // and release the object. 
    if([elementName isEqualToString:@"Month"]) 
    { 
     [appDelegate.stages addObject:aMonth]; 
     [aMonth release]; 
     aMonth = nil; 
    } 
    if([elementName isEqualToString:@"Stage"]) 
    { 
     [aMonth.monthStage addObject:aStage]; 
     [aStage release]; 
     aStage = nil; 
    } 
    else 
    { 
     [aStage setValue:currentElementValue forKey:elementName]; 
     [currentElementValue release]; 
     currentElementValue = nil; 
    } 
} 

- (void) dealloc 
{ 
    [aStage release]; 
    [aMonth release]; 
    [currentElementValue release]; 
    [super dealloc]; 
} 

@end 

我的RootViewController的：

@class DAFAppDelegate; //Here is my stages mutable array defined 

@interface RootViewController : UITableViewController 
{ 
    DAFAppDelegate *appDelegate; 
} 

@end 


#import "RootViewController.h" 
#import "DAFAppDelegate.h" 
#import "DetailViewController.h" 
#import "Stage.h" 
#import "Month.h" 
#import "AgendaCustomCell.h" 

@implementation RootViewController 

#pragma mark - 
#pragma mark View lifecycle 

- (void)viewDidLoad 
{ 
    [super viewDidLoad]; 
    appDelegate = (DAFAppDelegate *)[[UIApplication sharedApplication] delegate]; 
    self.title = NSLocalizedString(@"Agenda", @"Master view navigation title"); 

    UIImageView *image=[[UIImageView alloc]initWithFrame:CGRectMake(0,0,45,45)] ; 
    [image setImage:[UIImage imageNamed:@"topBarIcon.png"]]; 
    [self.navigationController.navigationBar.topItem setTitleView:image]; 

    self.tableView.backgroundColor = [UIColor clearColor]; 
} 

#pragma mark - 
#pragma mark Table view data source 

- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView 
{ 
    return [appDelegate.stages count]; 
} 

- (NSString *)tableView:(UITableView *)tableView titleForHeaderInSection:(NSInteger)section 
{ 
    return @"Month Name"; 
} 

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section 
{ 
    return [appDelegate.stages count]; 
} 

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath 
{ 
    static NSString *CellIdentifier = @"AgendaCustomCell"; 
    AgendaCustomCell *cell = (AgendaCustomCell *)[tableView dequeueReusableCellWithIdentifier:CellIdentifier]; 
    if (cell == nil) 
    { 
     NSArray *topLevelObject = [[NSBundle mainBundle] loadNibNamed:@"AgendaCustomCell" owner:nil options:nil]; 
     for (id currentObject in topLevelObject) 
     { 
     if ([currentObject isKindOfClass:[UITableViewCell class]]) 
     { 
      cell = (AgendaCustomCell *)currentObject; 
      break; 
     } 
     } 
    } 
    UIView *cellBackView = [[[UIView alloc] initWithFrame:CGRectZero] autorelease]; 
    cellBackView.backgroundColor = [UIColor colorWithPatternImage: [UIImage imageNamed:@"customCellBg.png"]]; 
    cell.backgroundView = cellBackView; 

    Month *aMonth = [appDelegate.stages objectAtIndex:indexPath.section]; 
    Stage *aStage = [aMonth.monthStage objectAtIndex:indexPath.row]; 

    cell.titleLabel.text = aStage.title; 
    cell.dateLabel.text = aStage.author; 
    cell.nameLabel.text = aStage.summary; 
    return cell; 
} 

- (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath 
{ 
return 60; 
} 

#pragma mark - 
#pragma mark Table view selection 

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath 
{ 
    //When a row is selected, create the detail view controller and set its detail item to the item associated with the selected row. 
DetailViewController *detailViewController = [[DetailViewController alloc] initWithStyle:UITableViewStyleGrouped]; 
detailViewController.stage = [appDelegate.stages objectAtIndex:indexPath.row]; 

    // Push the detail view controller. 
    [[self navigationController] pushViewController:detailViewController animated:YES]; 
    [detailViewController release]; 
} 

#pragma mark - 
#pragma mark Memory management 

- (void)dealloc 
{ 
    [appDelegate release]; 
    [super dealloc]; 
} 

@end 

請幫我在這一個。這幾天我一直在爲我打破頭緒，這讓我瘋狂。

感謝高級!!!

Answer 1

該問題可能與您的tableView:numberOfRowsInSection:實施有關。您可以返回部分的數量，而不是指定部分中的條目數量。根據您的測試XML，這將始終返回1，這可能是您遇到的問題。

要得到的條目數的部分，根據您的示例代碼我會做這樣的事情：

Month *aMonth = [appDelegate.stages objectAtIndex:section]; 
return [aMonth.monthStage count]; 

這將返回的條目數給定月份。

Answer 2

NSXMLParser在後臺工作，所以我想說當你的RootViewController tableView詢問你的appDelegate爲[appDelegate.stages count];時，它可能沒有準備好或者完成解析XML。

看看實現'parserDidEndDocument：'委託回調並在回調後加載UITableView數據。

Answer 3

加載沒有單例對象的xml意味着在你的情況下appDelegate作爲單例處理....在NSXMLParser的appDelegate中創建屬性，並且當你將對象設置爲autorelease而不是在dealloc中時。