Question

我有一个为iOS 4.x编写的项目。最近我使用XCode 4.3.2将其更新到iOS5。奇怪的是，当使用Apple LLVM编译器时，应用程序每次都会停止双重自由错误。在我改回LLVM GCC后，它运行正常。这两个有什么区别吗？代码如下所示：

- (NSArray *)readCourselist {

    NSString *path = [[self currentUserPathString] stringByAppendingPathComponent:kUserCourseListFilename];

    return [NSArray arrayWithContentsOfFile:path];

}

- (NSArray *)getCourselist {

    NSArray *courseRawArray = [self readCourselist];

    for (NSDictionary *courseDic in courseRawArray) {

        CourseModel *courseModel = [[CourseModel alloc] init];

        courseModel.courseID = [[courseDic objectForKey:kKeyID] intValue];

        courseModel.courseNameString = [courseDic objectForKey:kKeyTitle];

        NSArray *lectureArray = [courseDic objectForKey:kKeyLecture];

        for (NSDictionary *lectureDic in lectureArray) {

            LectureModel *lectureModel = [[LectureModel alloc] init];

            NSString *startString = [lectureDic objectForKey:kKeyStart];


            if ([startString isEqualToString:@"8:00"]) {

                lectureModel.lectureNumber = 1;

            }

            else if ([startString isEqualToString:@"9:50"]) {

                lectureModel.lectureNumber = 2;

            }



            lectureModel.location = [lectureDic objectForKey:kKeyWhere];  //@property of location is retain

            [courseModel.lectureArray addObject:lectureModel];

            [lectureModel release];

        }

        [courseArray addObject:courseModel];

        [courseModel release];

    }

}

通过更多追踪，我发现它是

lectureModel.location = [lectureDic objectForKey:kKeyWhere];

真的很重要。在我的LectureModel中，位置声明为

@property (nonatomic, retain) NSString *location;

@synthesize location;

- (id)init {
    location = NSLocalizedString(@"未知", nil);
}

删除NSLocalizedString，一切正常。为什么呢？

Answer 1

通常使用NSDictionary，您希望使用valueForKey:代替objectForKey:，但我不认为这是问题所在。如果你将它翻转回LLVM，并使用“Zombies”运行Instruments，它应该指向每个free（well，release）正在发生的确切位置。

使用Apple LLVM编译器时出现双重自由错误

1 个答案: