Question

目前正在处理核心数据

以下是我的数据模型：

WorkoutType (One to Many workouts with WorkoutSet)
WorkoutSet  (One to Many days with WorkoutDay)
WorkoutDay  (One to Many exercises with WorkoutExercise
WorkoutExercise

所有4的数据通过4个tableviews显示。

我正在使用FetchedResultsController，一切正常。

我的下一个问题是我从workoutExerciseTableViewController传递到另一个ViewController并漫游我如何将所有数据传递给此视图控制器。例如，我需要访问exerciseType，workoutSet和workoutDay数据，这些数据是为了达到exerciseExercise数据而选择的。

下面是我的WorkoutExerciseTableViewController中的fetchedResultsController：

-(void)fetchWorkoutExercises
{
    NSFetchRequest *fetchRequest = [NSFetchRequest     fetchRequestWithEntityName:@"WorkoutExercise"];
    NSPredicate *predicate = [NSPredicate predicateWithFormat:@"workoutDay = %@",     self.workoutDay];
    NSSortDescriptor *sortDescriptor = [NSSortDescriptor sortDescriptorWithKey:@"exerciseName" ascending:YES];
    [fetchRequest setSortDescriptors:@[sortDescriptor]];
    [fetchRequest setPredicate:predicate];
    self.fetchedResultsController = [[NSFetchedResultsController alloc]
                                 initWithFetchRequest:fetchRequest managedObjectContext:self.managedObjectContext
                                 sectionNameKeyPath:nil cacheName:nil];
    //self.fetchedResultsController.delegate = self;
    NSError *error;
    if (![self.fetchedResultsController performFetch:&error])
    {
        NSLog(@"Fetch failed: %@", error);
    }

}

感谢您提前提供任何帮助：）

Answer 1

您只需将选定的WorkoutExercise •exercise传递给下一个视图控制器，因为可以从那里访问其他数据

WorkoutDay *day = exercise.workoutDay;
WorkoutSet *set = day.workoutSet;
WorkoutType *type = set.workoutType;

使用反向关系。

一对多核心数据关系数据传递

1 个答案: