Question

我们，有些日子我正在解决一个问题并想得到你的帮助。我在服务器上有一个RSS文件，可以正常解析。基本上它是关于乐队的表演，音乐会，演出。这就是我创建Show-Class的原因：

Show.h：

#import <Foundation/Foundation.h>
#import <UIKit/UIKit.h>

@interface Show : NSObject {

    NSString* gigName;
    NSString* date;
    NSString* place;
    NSString* door;
    NSString* time;
    NSString* bands;
    NSString* entry;
    NSString* query;
    NSString* flyer;
    NSString* type;
}

- (id)init:(NSString*)gigName date:(NSString*)date place:(NSString*)place door:(NSString*)door time:(NSString*)time bands:(NSString*)bands
     entry:(NSString*)entry query:(NSString*)query flyer:(NSString*)flyer type:(NSString*)type;

@property (nonatomic, retain) NSString* gigName;
@property (nonatomic, retain) NSString* date;
@property (nonatomic, retain) NSString* place;
@property (nonatomic, retain) NSString* door;
@property (nonatomic, retain) NSString* time;
@property (nonatomic, retain) NSString* bands;
@property (nonatomic, retain) NSString* entry;
@property (nonatomic, retain) NSString* query;
@property (nonatomic, retain) NSString* flyer;
@property (nonatomic, retain) NSString* type;

@end

和Show.m：

#import "Show.h"

@implementation Show
@synthesize gigName, date , place, door, time, bands, entry, query, flyer, type;

- (id)init:(NSString*)_gigName date:(NSString*)_date place:(NSString*)_place door:(NSString*)_door time:(NSString*)_time bands:(NSString*)_bands
     entry:(NSString*)_entry query:(NSString*)_query flyer:(NSString*)_flyer type:(NSString*)_type {
    //if (self = [super init]) {
    self = [super init];

    if(self) {
        gigName = _gigName;
        date = _date;
        place = _place;
        door = _door;
        time = _time;
        bands = _bands;
        entry = _entry;
        query = _query;
        flyer = _flyer;
        type = _type;
    }
    return self;
}

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

在我的TourViewController（这是一个表格视图）中我创建了这个：

- (void)viewDidLoad {

    [super viewDidLoad];

    //Initialize the array.
    listOfItems = [[NSMutableArray alloc] init];

    pastShowArray = [NSMutableArray arrayWithCapacity:[stories count]]; // needs to be mutable
    futureShowArray = [NSMutableArray arrayWithCapacity:[stories count]]; // needs to be mutable


    for(int i = 0; i < [stories count]; i++) {

        // get fields from story parser object
        gigName = [[stories objectAtIndex:i] objectForKey:@"gig"];
        type = [[stories objectAtIndex:i] objectForKey:@"type"];
        date  = [[stories objectAtIndex:i] objectForKey:@"date"];
        place = [[stories objectAtIndex:i] objectForKey:@"place"];
        door = [[stories objectAtIndex:i] objectForKey:@"door"];
        time = [[stories objectAtIndex:i] objectForKey:@"time"];
        bands = [[stories objectAtIndex:i] objectForKey:@"bands"];
        entry = [[stories objectAtIndex:i] objectForKey:@"entry"];
        query = [[stories objectAtIndex:i] objectForKey:@"query"];
        flyer = [[stories objectAtIndex:i] objectForKey:@"flyer"];

        // remove unnecessary whitespaces
        gigName =   [gigName stringByTrimmingCharactersInSet: [NSCharacterSet whitespaceAndNewlineCharacterSet]];
        type =      [type stringByTrimmingCharactersInSet: [NSCharacterSet whitespaceAndNewlineCharacterSet]];
        date  =     [date stringByTrimmingCharactersInSet: [NSCharacterSet whitespaceAndNewlineCharacterSet]];
        place =     [place stringByTrimmingCharactersInSet: [NSCharacterSet whitespaceAndNewlineCharacterSet]];
        door =      [door stringByTrimmingCharactersInSet: [NSCharacterSet whitespaceAndNewlineCharacterSet]];
        time =      [time stringByTrimmingCharactersInSet: [NSCharacterSet whitespaceAndNewlineCharacterSet]];
        bands =     [bands stringByTrimmingCharactersInSet: [NSCharacterSet whitespaceAndNewlineCharacterSet]];
        entry =     [entry stringByTrimmingCharactersInSet: [NSCharacterSet whitespaceAndNewlineCharacterSet]];
        query =     [query stringByTrimmingCharactersInSet: [NSCharacterSet whitespaceAndNewlineCharacterSet]];
        flyer =     [flyer stringByTrimmingCharactersInSet: [NSCharacterSet whitespaceAndNewlineCharacterSet]];

        NSLog(gigName);
        NSLog(type);

        Show* show = [[Show alloc] init:gigName date:date place:place door:door time:time bands:bands entry:entry query:query flyer:flyer type:type];

        if([type isEqualToString:@"past"]) {
            // fill past show array
            NSLog(@"adding past object now");

            [pastShowArray addObject:show];

        } else {
            // fill future show array
            NSLog(@"adding future object now");

            [futureShowArray addObject:show];
        }
    } 

    NSMutableDictionary *pastShowsArrayDict = [NSMutableDictionary dictionaryWithObject:pastShowArray forKey:@"Show"];
    NSLog(@"added past show array to pastshowarraydict");

    NSMutableDictionary *futureShowsArrayDict = [NSMutableDictionary dictionaryWithObject:futureShowArray forKey:@"Show"];
    NSLog(@"added future show array to futureshowarraydict");

    [listOfItems addObject:pastShowsArrayDict];
    [listOfItems addObject:futureShowsArrayDict];

    //Set the title
    self.navigationItem.title = @"Tour";
}

据我所知，这一切都没有问题。现在我想在表格中显示节目的“gigName”。为此，我需要从NSDictionary获取show对象。我有这个，但它崩溃了：

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {

    static NSString *CellIdentifier = @"Cell";

    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
    if (cell == nil) {
        cell = [[[UITableViewCell alloc] initWithFrame:CGRectZero reuseIdentifier:CellIdentifier] autorelease];
    }

    // Set up the cell...
    NSLog(@"try to set up cell");
    //First get the dictionary object
    NSDictionary *dictionary = [listOfItems objectAtIndex:indexPath.section];
    NSArray *array = [dictionary objectForKey:@"Show"];

    Show *show = [array objectAtIndex:indexPath.row];
    NSLog(show.gigName);
    cell.text = show.gigName;

    return cell;
}

错误输出：

2011-02-14 16:32:44.462 All in Vain [405:307] try to set up cell
terminate called after throwing an instance of 'NSException'
Program received signal:  “SIGABRT”.

你能告诉我如何获取show对象并将表格文本设置为show.gigName吗？任何帮助都是适用的。谢谢，

欢呼声， doonot

Answer 1

尝试改变这一点：

cell.text = show.gigName;

进入：

cell.textLabel.text = show.gigName;

Answer 2

在<{>>显示对象的init:...中，您需要制作它：

self.gigName = _gigName;
self.date = _date;
self.place = _place;
self.door = _door;
self.time = _time;
self.bands = _bands;
self.entry = _entry;
self.query = _query;
self.flyer = _flyer;
self.type = _type;

这样它们每个都被保留（或者gigName = [_gigName retain];但是如果它不是空的话你就松开了它。

您可能在视图控制器中存在相同的问题以及在那里设置变量的方式但是看不到更多我无法确定。

如何从NSDictionary检索对象以设置表

2 个答案: