內存管理問題？收到「EXC_BAD_ACCESS」錯誤

Question

我認爲存在內存管理問題。當它嘗試分配第二次（運行代碼並進行第一次分配但第二次分配使其死亡）時，我收到「EXC_BAD_ACCESS」錯誤。

我有一個函數，它將採取自定義對象（包含日期和名稱變量）的數組。我需要將這個數組排序爲特定於月份的數組（所有的節點都將轉到aprilList，可能轉換爲mayList等）。

.h文件中

@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]; 
    } 
} 
} 

我在處理sceneData對象不正確？

Answer 1

您沒有正確初始化數組的：

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

此語法僅初始化最後一個指針......你應該使用：

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

在另一方面，所有的對象都泄漏，因爲（如果我沒有失去你的代碼中的東西），他們是本地變量（不autoreleased），你不會呼籲釋放他們......