NSMutableDictionary 中的内存泄漏

Question

我的编码包含内存泄漏，但不知何故我找不到泄漏。

泄漏为我指明了创建“ReportDetailItems”的方式

例如areaContainer = [[[ReportDetailItem alloc] init] autorelease];

我已经看了好几个小时了，我完全不知所措，报告泄漏的对象是“ReportDetailItem”，以及这些对象中包含的 NSMutableDictionary。

请指教。

------[ReportDetailItem.h

@interface ReportDetailItem : NSObject
{
    NSNumber *total;
    NSMutableDictionary *items;

}

@property (nonatomic, retain) NSNumber *total;
@property (nonatomic, retain) NSMutableDictionary *items;

- (NSString *)description;

@end

------[ReportDetailItem.m

@synthesize items, total;

- (id)init {
    if (self = [super init]) {
        self.items = [NSMutableDictionary dictionaryWithCapacity:0];
        DLog("Alloc: %d", [items retainCount]);
    }   


    return self;
}

- (NSString *)description {
    return @"ReportDetailItem";
}

- (void)release {
    [super release];
}

- (void)dealloc {
    [self.items release];
    [self.total release];

    items = nil;
    total = nil;

    [super dealloc];
}

@end

------[泄露代码

NSError *error;
NSArray *data = [self.managedObjectContext executeFetchRequest:request error:&error];
if (data == nil || [data count] == 0) {
    DLog(@"No data.")
} else {
    for (int i=0; i < [data count]; i++) {
        TaskEntity *task = [data objectAtIndex:i];

        NSString *areaKey = task.activity.project.area.title.text;
        NSString *projectKey = task.activity.project.title.text;
        NSString *activityKey = task.activity.title.text;


        ReportDetailItem *areaContainer;
        if (![dataSource objectForKey:areaKey]) {
            areaContainer = [[[ReportDetailItem alloc] init] autorelease];
        } else { 
            areaContainer = [dataSource objectForKey:areaKey];
        }
        areaContainer.total = [NSNumber numberWithInt:([task.seconds intValue] + [areaContainer.total intValue])];
        [dataSource setObject:areaContainer forKey:areaKey];


        ReportDetailItem *projectContainer;
        if (![areaContainer.items objectForKey:projectKey]) {
            projectContainer = [[[ReportDetailItem alloc] init] autorelease];
        } else {
            projectContainer = [areaContainer.items objectForKey:projectKey];
        }
        projectContainer.total = [NSNumber numberWithInt:([task.seconds intValue] + [projectContainer.total intValue])];
        [areaContainer.items setObject:projectContainer forKey:projectKey];


        ReportDetailItem *activityContainer;
        if (![projectContainer.items objectForKey:activityKey]) {
            activityContainer = [[[ReportDetailItem alloc] init] autorelease];
        } else {
            activityContainer = [projectContainer.items objectForKey:activityKey];
        }
        activityContainer.total = [NSNumber numberWithInt:([task.seconds intValue] + [activityContainer.total intValue])];
        [projectContainer.items setObject:activityContainer forKey:activityKey];

    }
}

Answer 1

找到了，泄漏的位置是我分配“dataSource”的方式

---[泄漏

- (void)viewDidLoad {
    [super viewDidLoad];
    self.dataSource = [[NSMutableDictionary alloc] init];
    [self fetchData];
}

---[无泄漏

- (void)viewDidLoad {
    [super viewDidLoad];

NSMutableDictionary *dict = [[NSMutableDictionary alloc] init];
self.dataSource = dict;
[dict release];

[self fetchData];


}

Answer 2

我非常怀疑您将指针分配给 ReportDetailItem 的两种方式。你为什么要首先自动释放对象？如果不试试这个

ReportDetailItem *projectContainer;
        if (![areaContainer.items objectForKey:projectKey]) {
            projectContainer = [[ReportDetailItem alloc] init];  
       } else {
            projectContainer = [[areaContainer.items objectForKey:projectKey] retain];
        }
        projectContainer.total = [NSNumber numberWithInt:([task.seconds intValue] + [projectContainer.total intValue])];
        [areaContainer.items setObject:projectContainer forKey:projectKey];

      if(projectContainer) {
       [projectContainer release];
       projectContainer = nil;
      }