内存管理问题？收到“EXC_BAD_ACCESS”错误

Question

我相信内存管理有问题。我在尝试第二次分配时收到“EXC_BAD_ACCESS”错误（运行代码并进行第一次分配，但第二次使其死亡）。

我有一个函数，它将接受一组自定义对象（包含日期和名称变量）。我需要将此数组排序为特定月份的数组（所有四月将进入 aprilList，可能进入 mayList 等）。

.h 文件

@class SceneData;

@interface DetailedSceneViewController : UIViewController <UITableViewDataSource,   UITableViewDelegate> 
{
    UITableView *mainTableView;
    SceneData *sceneData;
    NSArray *monthsArray;
}


@end

.m 文件

#import "SceneData.h"


- (void) sortMonths {
Agri_ImaGIS_iPhoneAppDelegate *dataCenter = (Agri_ImaGIS_iPhoneAppDelegate *) [[UIApplication sharedApplication] delegate];

NSMutableArray *janList, *febList, *marList, *aprList, *mayList, *junList, *julList, *augList, *sepList, *octList, *novList, *decList = [[NSMutableArray alloc] init];

int count = [dataCenter.sortedDataList count];

NSLog(@"count: %d", count);

for (int i = 0; i < count; i++)
{
    sceneData = [dataCenter.sortedDataList objectAtIndex:i];
    if ([sceneData.name rangeOfString:@"Jan" ].location != NSNotFound)
    {
        NSLog(@"jan name: %@", sceneData.name);
        [janList addObject: sceneData];
    }
    else if ([sceneData.name rangeOfString:@"Feb" ].location != NSNotFound)
    {
        NSLog(@"feb name: %@", sceneData.name);
        [febList addObject:sceneData];
    }
    else if ([sceneData.name rangeOfString:@"Mar" ].location != NSNotFound)
    {
        NSLog(@"Mar name: %@", sceneData.name);
        [marList addObject:sceneData];
    }
    else if ([sceneData.name rangeOfString:@"Apr" ].location != NSNotFound)
    {
        NSLog(@"Apr name: %@", sceneData.name);
        [aprList addObject:sceneData];
    }
    else if ([sceneData.name rangeOfString:@"May" ].location != NSNotFound)
    {
        NSLog(@"May name: %@", sceneData.name);
        [mayList addObject:sceneData];
    }
    else if ([sceneData.name rangeOfString:@"Jun" ].location != NSNotFound)
    {
        NSLog(@"Jun name: %@", sceneData.name);
        [junList addObject:sceneData];
    }
    else if ([sceneData.name rangeOfString:@"Jul" ].location != NSNotFound)
    {
        NSLog(@"Jul name: %@", sceneData.name);
        [julList addObject:sceneData];
    }
    else if ([sceneData.name rangeOfString:@"Aug" ].location != NSNotFound)
    {
        NSLog(@"Aug name: %@", sceneData.name);
        [augList addObject:sceneData];
    }
    else if ([sceneData.name rangeOfString:@"Sep" ].location != NSNotFound)
    {
        NSLog(@"Sep name: %@", sceneData.name);
        [sepList addObject:sceneData];
    }
    else if ([sceneData.name rangeOfString:@"Oct" ].location != NSNotFound)
    {
        NSLog(@"Oct name: %@", sceneData.name);
        [octList addObject:sceneData];
    }
    else if ([sceneData.name rangeOfString:@"Nov" ].location != NSNotFound)
    {
        NSLog(@"Nov name: %@", sceneData.name);
        [novList addObject:sceneData];
    }
    else if ([sceneData.name rangeOfString:@"Dec" ].location != NSNotFound)
    {
        NSLog(@"Dec name: %@", sceneData.name);
        [decList addObject:sceneData];
    }
}
}

我是否错误地处理了 sceneData 对象？

Answer 1

你没有正确初始化你的数组：

NSMutableArray *janList, *febList, *marList, *aprList, *mayList, *junList, *julList, *augList, *sepList, *octList, *novList, *decList = [[NSMutableArray alloc] init];

这种语法只会初始化最后一个指针...你应该使用：

NSMutableArray *janList = [[NSMutableArray alloc] init];
NSMutableArray *febList = [[NSMutableArray alloc] init];
...
NSMutableArray *decList = [[NSMutableArray alloc] init];

另一方面，所有这些对象都在泄漏，因为（如果我没有遗漏您的代码中的某些内容）它们是局部变量（不是自动释放的）并且您不会对它们调用 release...