在Firebase数据库Objective-C中添加项目

Question

我想在Firebase数据库中添加内容，但它不起作用。

在我的ViewController.m中，我认为这里有一个问题：

- (IBAction)addButtonDidTouch:(id)sender {
UIAlertController *alert = [UIAlertController alertControllerWithTitle:@"Grocery Item" message:@"Add an Item" preferredStyle:UIAlertControllerStyleAlert];


UIAlertAction *saveAction = [UIAlertAction actionWithTitle:@"Save" style:UIAlertActionStyleDefault handler:^(UIAlertAction * _Nonnull action) {

        UITextField *textField = alert.textFields[0];
        GroceryItem *groceryItem = [[GroceryItem alloc]initWithName:textField.text byUser:self.user.email completed:false withKey:@""];
        Firebase *groceryItemRef = [[Firebase alloc ]childByAppendingPath:textField.text.lowercaseString];
        [groceryItemRef setValue:groceryItem.toAnyObject];



}];
  UIAlertAction *cancelAlert = [UIAlertAction actionWithTitle:@"Cancel" style:UIAlertActionStyleDefault handler:^(UIAlertAction * _Nonnull action) {
      NSLog(@"You was cancel");
  }];
[alert addTextFieldWithConfigurationHandler:^(UITextField * _Nonnull textField) {

        [alert addAction:saveAction];

        [alert addAction:cancelAlert];

}];
[self presentViewController:alert animated:true completion:nil]; }

当点击按钮添加并输入文字时，我点击SAVE ..它不起作用 请观看我的图片