如何从NSDictionary检索对象以设置表

I guys, I am fighting with a problem since some days and wanted to get your assistance. I have an RSS file on a server which gets parsed normally. Basically it's about shows, concerts, gigs of a band. That's why I have created the Show-Class:

我们，有些日子我正在解决一个问题并希望得到你们的帮助。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:

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

and the Show.m:

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

In my TourViewController (which is a table view) i have created this:

在我的TourViewController（这是一个表视图）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";
}

As far as I can tell, that worked all without problems. Now I want to show the "gigName" of the show in the table. For this I need to get the show object from the NSDictionary. I have this but it crashes:

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;
}

Error Output:

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”.

Can you guys tell me how I can get the show object and set the table text to show.gigName? Any help is appreaciated. Thank you,

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，

cheers, doonot

欢呼，doonot

2 个解决方案

#1

In your init:... for the Show object you need to make it:

在你的init：...对于Show对象你需要做到：

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;

so that each of them are retained (or do gigName = [_gigName retain]; but then you loose the release if it was not empty).

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

You may also have the same problem in the view controller and the way the variables are being set there but without seeing more I can't be sure.

你可能在视图控制器和变量的设置方式也有同样的问题，但没有看到更多，我不能确定。

#2

Try to change this :

试着改变这个：

cell.text = show.gigName;

into :

进入：

cell.textLabel.text = show.gigName;

#1