Coredata 的deletedObjects 方法的使用 附带终止程序的函数

abort();//终止程序

NSFetchRequest *request = [[NSFetchRequest alloc] init];

NSEntityDescription *entity = [NSEntityDescription entityForName:@"Student" inManagedObjectContext:self.managedObjectContext];

request.entity = entity;

NSPredicate *predicate = [NSPredicate predicateWithFormat:@"name = %@",name];

request.predicate = predicate;

NSArray *arr = [self.managedObjectContext executeFetchRequest:request error:nil];

for (Student *stu in arr) {

[self.managedObjectContext deleteObject:stu];

NSLog(@"%@", [self.managedObjectContext deletedObjects]);//这里返回的是  还没有执行删除操作的数据的集合，其他方法同理。

[self.managedObjectContext save:nil];

}