[MagicalRecord saveWithBlock:^(NSManagedObjectContext *localContext) {
Course *course = [Course MR_createInContext:localContext];
course.classesName = classesName; course.teacherName = teacherName; course.classroom = @"体育馆"; course.startTime = startTime; course.weekday = weekday; course.weekNumber = [NSKeyedArchiver archivedDataWithRootObject:allweekNumber]; course.howLOng= howLong; } completion:^(BOOL success, NSError *error) { NSLog(@"SUCCESS: %d, with ERROR: %@", success, error); }]; 这里是代码，里面NSKeyedArchiver那行感觉有问题，因为数据肯定都对，但是存的时候有时候存不上会在这句崩溃，有的时候是能存上，但是读不出来。求教各位
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