ios - 来自对象的一些数据要么不保存要么不加载

Question

我正在开发一个简单的应用程序来跟踪我女儿的曲棍球比赛。我的问题是，当我停止并重新启动应用程序时，一些数据不会重新加载。(我正在检查一个只显示零的日志语句，不管之前有什么。)我不确定是否问题出在加载或保存上。

(很抱歉这篇文章很长，但我不知道该看哪里。)

它使用如下所示的 Games 类:

#import <Foundation/Foundation.h>

@interface Game : NSObject <NSCoding>//conforms to this protocol so data can be prepared for read/write to file

//used primarily in GameFactsViewController
@property (nonatomic, strong) NSString *opponent;
@property (nonatomic, strong) NSDate *dateOfGame;

//used primarily in PlayerActionsViewController
@property (nonatomic) NSInteger shotsOnGoal;
@property (nonatomic) NSInteger shotsNotOnGoal;
@property (nonatomic) NSInteger passesCompleted;
@property (nonatomic) NSInteger passesNotCompleted;
@property (nonatomic) NSInteger takeaways;
@property (nonatomic) NSInteger giveaways;
@property (nonatomic) NSInteger faceoffsWon;
@property (nonatomic) NSInteger faceoffsLost;
@property (nonatomic) NSInteger shifts;
@property (nonatomic) NSInteger blockedShots;

@end

我的问题是当我再次启动应用程序时，对手和 dateOfGame 属性被保存和加载，但其他属性都没有。

主 Controller 是一个 TableView Controller ，每场比赛都是一行。opponent 和 dateOfGame 属性在 TableView Controller 中设置，其他属性在选项卡栏 Controller 内的 View Controller 中设置。这些 Controller 的序列是通过第一个 Controller 的公开指示器和单击第二个 Controller 的行来完成的。使用以下代码，这些工作正常:

- (void) prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender
{
    //check for proper seque
    if ([segue.identifier isEqualToString:@"AddGame"]) {

        //identify the top level view controller holding the GameFactsVC (see storyboard)
        UINavigationController *navigationController = segue.destinationViewController;

        //go down one level to get the GFVC
        GameFactsViewController *controller = (GameFactsViewController *) navigationController.topViewController;

        //set the current controller (the HSVC) as the delegate for the GFVC
        controller.delegate = self;

    } else if ([segue.identifier isEqualToString:@"EditGame"]) {

        //as above to get to the right place
        UINavigationController *navigationController = segue.destinationViewController;
        GameFactsViewController *controller = (GameFactsViewController *) navigationController.topViewController;
        controller.delegate = self;

        //"sender" here is what was clicked, the detail disclosure icon
        //this identifies what game data to load to edit
        NSIndexPath *indexPath = [self.tableView indexPathForCell:sender];
        controller.gameToEdit = _games[indexPath.row];

    } else if ([segue.identifier isEqualToString:@"GameDetails"]) {

        UITabBarController *tabBarController = segue.destinationViewController;
        PlayerActionsViewController *controller = (PlayerActionsViewController *)[[tabBarController viewControllers] objectAtIndex:0];
        controller.delegate = self;

        NSIndexPath *indexPath = [self.tableView indexPathForCell:sender];

        controller.gameToEditPerformance = _games[indexPath.row];
        NSLog(@"Data passed %ld", (long)controller.gameToEditPerformance.shotsOnGoal);

    }
}

我使用对手和 dateOfGame 的方法返回主 Controller ，并且我可以记录返回的数据。

-(IBAction) done
{
    //Use delegate to capture entered data and pass to HSVC
    //methods here are delegate methods listed above and defined in the HSVC

    //see if the data was empty when view loaded
    if (self.gameToEdit == nil) {

        Game *game = [[Game alloc] init];
        game.opponent = self.opponentField.text;
        game.dateOfGame = [self convertToDate:self.dateLabel.text withFormat:@"MMM d, yyyy"];


        [self.delegate gameFactsViewController:self didFinishAddingGame:game];

    } else {
        self.gameToEdit.opponent = self.opponentField.text;//updates data model; will update display in delegate method
        self.gameToEdit.dateOfGame = [self convertToDate:self.dateLabel.text withFormat:@"MMM d, yyyy"];

        [self.delegate gameFactsViewController: self didFinishEditingGame:self.gameToEdit];
    }


}

同样，我在一个设置数据值的长方法末尾使用这一行从另一个 Controller 传回其余数据，我也可以在此处记录返回的正确数据。

[self.delegate playerActionsViewController:self didEditGameData:self.gameToEditPerformance];

我正在使用这两个类似的方法调用 Save 方法。 (我认为关键的区别是我已经更新了另一个表中的显示，而我仍然需要更新主视图。)

- (void) gameFactsViewController:(GameFactsViewController *)controller didFinishEditingGame:(Game *)game
{
    //edit already made in data model in GFVC
    //need to update display

    NSInteger index = [_games indexOfObject: game];//locate the item being edited in the games array
    NSIndexPath *indexPath = [NSIndexPath indexPathForRow:index inSection:0];
    UITableViewCell *cell = [self.tableView cellForRowAtIndexPath:indexPath];//get the right cell

    [self configureDataForCell:cell withGame:game];//puts the game data into the labels in the cell

    [self saveGames];//write the current data to the file

    [self dismissViewControllerAnimated:YES completion:nil];

}

- (void) playerActionsViewController: (PlayerActionsViewController *) controller didEditGameData: (Game *) game
{
    NSLog(@"Paased back shots %ld", (long) game.shotsOnGoal);
    [self saveGames];


}

现在可以保存和加载数据。我正在使用这段代码:

- (void) loadGames
{
    NSString *path = [self dataFilePath];//for convenience below

    //if there is already a data file, unarchive/decode and load games array
    //else create an empty arry to hold games
    if ([[NSFileManager defaultManager] fileExistsAtPath: path]) {

        NSData *data = [[NSData alloc] initWithContentsOfFile: path];//data structure created and loaded with file data
        NSKeyedUnarchiver *unarchiver = [[NSKeyedUnarchiver alloc] initForReadingWithData: data];//archiver created and connected to data

        _games = [unarchiver decodeObjectForKey:@"Games"];

        [unarchiver finishDecoding];//data now in games array

    } else {

        _games = [[NSMutableArray alloc] initWithCapacity:50];
    }
}

- (void) saveGames
{
    NSMutableData *data = [[NSMutableData alloc] init];//data structure to hold the data to be saved after encoding
    NSKeyedArchiver *archiver = [[NSKeyedArchiver alloc] initForWritingWithMutableData:data];

    [archiver encodeObject:_games forKey:@"Games"];//I believe key here needs to match class name that will be saved. It tells archiver how to encode object properly

    [archiver finishEncoding];//finish encoding, with data now in data structure

    [data writeToFile:[self dataFilePath] atomically:YES];//write data structure to file determined above

}

我猜想，这两种情况之间的 _games 数组中的某个地方存在差异，但我没有看到它。或者是其他问题。

谢谢。

Answer 1

问题出在我的游戏课上。我忘记包含使用

编码和解码 NSIntegers 的 key

[aCoder encodeInteger:self.shotsOnGoal forKey:@"ShotsOnGoal"];
self.shotsOnGoal = [aDecoder decodeIntegerForKey:@"ShotsOnGoal"];

等等