尝试滚动时UITableView崩溃

Question

我在UITableView中的数据有问题.我有UIViewController,它包含UITableView插座和我正在使用的更多东西......它有效:)它很可爱,但是......

我创建了一个RSS阅读器类,它使用委托将数据部署到表中......再次,如果我只是在主控制器中创建虚拟数据,一切正常!

问题在于这一行:rss.delegate = self;

预览看起来有点破碎,这些是Google代码上的RSS阅读器文件:

(链接到GoogleCode上的头文件)

(链接到Google代码上的实施文件)

我的控制器的viewDidLoad函数:

IGDataRss20 *rss = [[[IGDataRss20 alloc] init] autorelease];
rss.delegate = self;
[rss initWithContentsOfUrl:@"http://rss.cnn.com/rss/cnn_topstories.rss"];

和我的委托方法:

- (void)parsingEnded:(NSArray *)result {
    super.data = [[NSMutableArray alloc] initWithArray:result];
    NSLog(@"My Items: %d", [super.data count]);
    [super.table reloadData];
    NSLog(@"Parsing ended");
}

- (void)parsingError:(NSString *)message {
    NSLog(@"MyMessage: %@", message);
}

- (void)parsingStarted:(NSXMLParser *)parser {
    NSLog(@"Parsing started");
}

只是为了澄清,NSLog(@"Parsing结束"); 正在执行,我在数组中有10个项目.

希望有人能够帮助我,因为我变得非常绝望,我以为我已经不是这样的新手:)

谢谢,

的Ondrej

我的头文件的完整副本(表控制器)

WGTempTableController类是带有表插座,数据阵列等的UIViewController ...

//
//  CRFeedController.h
//  czReader
//
//  Created by Ondrej Rafaj on 5.4.10.
//  Copyright 2010 Home. All rights reserved.
//

#import <UIKit/UIKit.h>
#import "WGTempTableController.h"
#import <IGDataRss20.h>


@interface CRFeedController : WGTempTableController <IGDataRss20Delegate> {

    //NSString *startUrl;

}

@end

我的实施文件的完整副本(表格控制器)

所有其他函数,如numberOfSectionsInTableView或numberOfRowsInSection都在WGTempTableController中

//
//  CRFeedController.m
//  czReader
//
//  Created by Ondrej Rafaj on 5.4.10.
//  Copyright 2010 Home. All rights reserved.
//

#import "CRFeedController.h"
#import "WGTempCell.h"


@implementation CRFeedController

- (void)viewDidLoad {
    [super viewDidLoad];
    IGDataRss20 *rss = [[[IGDataRss20 alloc] init] autorelease];
    rss.delegate = self;
    [rss initWithContentsOfUrl:@"http://rss.cnn.com/rss/cnn_topstories.rss"];
    // self.navigationItem.rightBarButtonItem = self.editButtonItem;
}

- (void)parsingEnded:(NSArray *)result {
    super.data = [[NSMutableArray alloc] initWithArray:result];
    NSLog(@"My Items: %d", [super.data count]);
    [super.table reloadData];
    NSLog(@"Parsing ended");
}

- (void)parsingError:(NSString *)message {
    NSLog(@"MyMessage: %@", message);
}

- (void)parsingStarted:(NSXMLParser *)parser {
    NSLog(@"Parsing started");
}

- (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;
}

#pragma mark Table view

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
    static NSString *CellIdentifier = @"MyCell";
    WGTempCell *cell = (WGTempCell *) [table dequeueReusableCellWithIdentifier:CellIdentifier];
    if (cell == nil) {
        NSArray *topLevelObjects = [[NSBundle mainBundle] loadNibNamed:@"CRFeedCell" owner:nil options:nil];
        for(id currentObject in topLevelObjects) {
            if([currentObject isKindOfClass:[WGTempCell class]]) {
                cell = (WGTempCell *) currentObject;
                break;
            }
        }
    }
    NSDictionary *d = [super.data objectAtIndex:indexPath.row];
    [[cell cellTitle] setText:[d objectForKey:@"title"]];
    return cell;
}



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


@end

我的头文件(rss阅读器)的完整副本

//
//  IGDataRss20.h
//  IGFrameworkProject
//
//  Created by Ondrej Rafaj on 4.4.10.
//  Copyright 2010 Home. All rights reserved.
//

#import <Foundation/Foundation.h>

@class IGDataRss20;

@protocol IGDataRss20Delegate <NSObject>

@optional

- (void)parsingStarted:(NSXMLParser *)parser;

- (void)parsingError:(NSString *)message;

- (void)parsingEnded:(NSArray *)result;

@end


@interface IGDataRss20 : NSObject {

    NSXMLParser *rssParser;
    NSMutableArray *data;

    NSMutableDictionary *currentItem;

    NSString *currentElement;

    id <IGDataRss20Delegate> delegate;

}

@property (nonatomic, retain) NSMutableArray *data;

@property (nonatomic, assign) id <IGDataRss20Delegate> delegate;


- (void)initWithContentsOfUrl:(NSString *)rssUrl;

- (void)initWithContentsOfData:(NSData *)inputData;


@end

我的实施文件的完整副本(rss阅读器)

//
//  IGDataRss20.m
//  IGFrameworkProject
//
//  Created by Ondrej Rafaj on 4.4.10.
//  Copyright 2010 Home. All rights reserved.
//

#import "IGDataRss20.h"


@implementation IGDataRss20

@synthesize data, delegate;

- (void)initWithContentsOfUrl:(NSString *)rssUrl {
    self.data = [[NSMutableArray alloc] init];
    NSURL *xmlURL = [NSURL URLWithString:rssUrl];
    rssParser = [[NSXMLParser alloc] initWithContentsOfURL:xmlURL];
    [rssParser setDelegate:self];
    [rssParser setShouldProcessNamespaces:NO];
    [rssParser setShouldReportNamespacePrefixes:NO];
    [rssParser setShouldResolveExternalEntities:NO];
    [rssParser parse];
}

- (void)initWithContentsOfData:(NSData *)inputData {
    self.data = [[NSMutableArray alloc] init];
    rssParser = [[NSXMLParser alloc] initWithData:inputData];
    [rssParser setDelegate:self];
    [rssParser setShouldProcessNamespaces:NO];
    [rssParser setShouldReportNamespacePrefixes:NO];
    [rssParser setShouldResolveExternalEntities:NO];
    [rssParser parse];
}

- (void)parserDidStartDocument:(NSXMLParser *)parser {
    [[self delegate] parsingStarted:parser];
}

- (void)parser:(NSXMLParser *)parser parseErrorOccurred:(NSError *)parseError {
    NSString * errorString = [NSString stringWithFormat:@"Unable to parse RSS feed (Error code %i )", [parseError code]];
    NSLog(@"Error parsing XML: %@", errorString);
    if ([parseError code] == 31) NSLog(@"Error code 31 is usually caused by encoding problem.");
    [[self delegate] parsingError:errorString];
}

- (void)parser:(NSXMLParser *)parser didStartElement:(NSString *)elementName namespaceURI:(NSString *)namespaceURI qualifiedName:(NSString *)qName attributes:(NSDictionary *)attributeDict {
    currentElement = [elementName copy];
    if ([elementName isEqualToString:@"item"]) currentItem = [[NSMutableDictionary alloc] init];
}

- (void)parser:(NSXMLParser *)parser didEndElement:(NSString *)elementName namespaceURI:(NSString *)namespaceURI qualifiedName:(NSString *)qName {
    if ([elementName isEqualToString:@"item"]) {
        [data addObject:(NSDictionary *)[currentItem copy]];
    }
}

- (void)parser:(NSXMLParser *)parser foundCharacters:(NSString *)string {
    if (![currentItem objectForKey:currentElement]) [currentItem setObject:[[[NSMutableString alloc] init] autorelease] forKey:currentElement];
    [[currentItem objectForKey:currentElement] appendString:string];
}

- (void)parserDidEndDocument:(NSXMLParser *)parser {
    //NSLog(@"RSS array has %d items: %@", [data count], data);
    [[self delegate] parsingEnded:(NSArray *)self.data];
}




- (void)dealloc {
    [data, delegate release];
    [super dealloc];
}

@end

Answer 1

您的主题说当您尝试滚动时它会崩溃.我不知道这与你的rss.delegate有什么关系,所以我只是忽略它并关注可能与滚动相关的错误,这些错误通常在tableView:cellForRowAtIndexPath:中.

1. 检查您的CRFeedCell.xib,查看WGTempCell对象的信息,并确保其Identifier字段与您的代码中的CellIdentifier匹配.( "了myCell")

2. 确保您没有在代码中的其他位置为其他UITableViewCell子类使用相同的CellIdentifier.

3. 这是什么样的崩溃？如果是EXC_BAD_ACCESS,请双击您的可执行文件,转到Arguments,创建一个NSZombieEnabled环境变量,并将其设置为YES.(在完成调试时取消选中它以避免泄漏内存.)这将显示您在应用程序崩溃时尝试访问的对象.

4. 在setText:setView中设置一个断点:cellForRowAtIndexPath:.然后在你的gdb提示符下输入po [d objectForKey:@"title"].确保该对象确实是一个NSString.