无法在表视图单元格中显示来自App Delegate的数组数据

@property (nonatomic, strong) NSArray *dataArray;

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
    // 其他初始化代码...
    
    self.dataArray = @[@"数据1", @"数据2", @"数据3"];
    
    // 其他代码...
    
    return YES;
}

#import "AppDelegate.h"

// 其他代码...

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:@"CellIdentifier" forIndexPath:indexPath];
    
    AppDelegate *appDelegate = (AppDelegate *)[[UIApplication sharedApplication] delegate];
    NSString *data = appDelegate.dataArray[indexPath.row];
    
    cell.textLabel.text = data;
    
    return cell;
}

// 其他代码...

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {
    AppDelegate *appDelegate = (AppDelegate *)[[UIApplication sharedApplication] delegate];
    return appDelegate.dataArray.count;
}