I mMaking an Pierre, and I m working at this TableViewController, but when test, I have this mis, and I t do with this:

2012-01-13 13:45:32.947 HandHistory Reviews[3422:707] *** 
Terminating app due to uncaught exception  NSUnknownKeyException , 
reason:  [<SessionsTableViewController 0x191cb0> setValue:forUndefinedKey:]: 
this class is not key value coding-compliant for the key dataSource. 

没有人会想?

这是我的开庭记录:

#import "SessionsTableViewController.h"
#import "Session.h"

@interface SessionsTableViewController()

@property (nonatomic, copy) NSArray *sessions;

@end

@implementation SessionsTableViewController

@synthesize sessions = _sessions;

#pragma mark - View lifecycle

- (void)viewWillAppear:(BOOL)animated
{
    [super viewWillAppear:animated];

    NSMutableArray *sessions = [[NSMutableArray alloc] init];

    // Looking for files
    // Finding the Documents directory
    NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
    NSString *path = [paths objectAtIndex:0];
    NSArray *directoryContent = [[NSFileManager defaultManager] contentsOfDirectoryAtPath:path error:nil];

    // Looping through each file in the directory
    for (NSString *file in directoryContent)
    {
        NSString *contents = [NSString stringWithContentsOfFile:[[paths objectAtIndex:0] stringByAppendingPathComponent:file] encoding:NSUTF8StringEncoding error:nil];

        Session *session = [[Session alloc] initWithName:file andContents:contents];

        [sessions addObject:session];
    }

    self.sessions = sessions;
}

#pragma mark - Table view data source

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

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
    static NSString *CellIdentifier = @"Session Cell";

    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
    if (cell == nil) {
        cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier];
    }

    //cell.textLabel.text = [[self.sessions objectAtIndex:indexPath.row] name];
    //cell.detailTextLabel.text = [[NSString alloc] initWithFormat:@"%d hands", 10];

    return cell;
}



#pragma mark - Table view delegate

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
    // Navigation logic may go here. Create and push another view controller.
    /*
     <#DetailViewController#> *detailViewController = [[<#DetailViewController#> alloc] initWithNibName:@"<#Nib name#>" bundle:nil];
     // ...
     // Pass the selected object to the new view controller.
     [self.navigationController pushViewController:detailViewController animated:YES];
     */
}

@end