遍历指定目录下的文件，将复合条件的文件加载到列表(UITableView))
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- (void)viewDidLoad{    NSFileManager *fileManager = [[NSFileManager defaultManager] init];    everyTitle = [[NSMutableArray alloc] init];    NSArray *filePaths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);    NSString *filePath = [filePaths objectAtIndex:0];//    NSLog(@"%@",filePath);    NSDirectoryEnumerator *direnum = [fileManager enumeratorAtPath:filePath];    //    NSMutableArray *array = [[NSMutableArray alloc] init];    NSString *fileName;    while ((fileName = [direnum nextObject])) {        if([[fileName pathExtension] isEqualToString:@"pdf"]){                        NSArray *strings = [fileName componentsSeparatedByString:@"."];            NSString *fileTitle = [strings objectAtIndex:[strings count]-2];                   [everyTitle addObject:fileTitle];                }    }        uiController = [[UIViewController alloc] init];    [uiController setTitle:@"目录"];        navController = [[UINavigationController alloc] initWithRootViewController:uiController];    navController.view.frame = CGRectMake(0, 0, 320, 460);    [self.view addSubview:navController.view];        self.uiController.navigationItem.leftBarButtonItem = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemBookmarks target:self action:@selector(tableUpdata)];//        self.uiController.navigationItem.rightBarButtonItem = [[UIBarButtonItem alloc] initWithTitle:@"刷新列表" style:UIBarButtonItemStyleBordered target:self action:@selector(tableUpdata)];        tableView *tableViews = [[tableView alloc] initWithStyle:UITableViewStylePlain];    tableViews.view.frame = CGRectMake(0, 45, 320, 460);    [tableViews theValue:everyTitle];    [self.view addSubview:tableViews.view];//    [tableViews release];    }