对象泄漏的原因(Objective C)

Question

有人能解释一下为什么对象引用在末尾有计数器1吗?

5   Malloc  +1  1   00:03.412.584   Control -[PaymillPaymentService createServiceRequestWith:and:]
6   Autorelease         00:03.412.596   Control -[PaymillPaymentService createServiceRequestWith:and:]
7   Retain  +1  2   00:03.412.608   libsystem_sim_blocks.dylib  _Block_object_assign
8   Retain  +1  3   00:03.412.620   Control -[DashboardViewController requestMainTransactionsList]
9   Release -1  2   00:03.506.116   UIKit   _UIApplicationHandleEvent
10  Release -1  1   00:04.104.252   Control -[DashboardViewController transactionListLoadingComplete:]

5,6)调用alloc/init(工厂方法)，返回自动释放对象给调用者

- (ServiceRequest*)createServiceRequestWith:(NSString*)url and:(id)delegate
{
    NSURL *fullURL = [NSURL URLWithString:url];
    NSMutableURLRequest *request = [[[NSMutableURLRequest alloc] initWithURL:fullURL] autorelease];
    [NSMutableURLRequest basicAuthForRequest:request  withUsername:[self accessToken] andPassword:@""];
    ServiceRequest *serviceRequest = [[ServiceRequest alloc]  initWithURLRequest:request forDelegate:delegate];
    return [serviceRequest autorelease];
} 

7)作为参数传递给block

__unsafe_unretained id blockRequest = serviceRequest;
[operation setCompletionBlock:^{
    [self handleTransactionListRequest:blockRequest];
}];

8)赋值给强属性

ServiceRequest* request = [[[AppController sharedController] currentService] retrieveTransactionListInto:transactionList usingInterval:timeInterval forDelegate:self];
request.tag = @"main";
self.currentMainRequest = request;

9) ? ?(可能是block release)

10)从属性释放

 [currentMainRequest release];

根据我的理解，第一个malloc保持不平衡，但第一个malloc创建对象，它总是+1 !!

Answer 1

块保留它们引用的对象。

7   Retain  +1  2   00:03.412.608   libsystem_sim_blocks.dylib  _Block_object_assign

尝试在变量旁边使用__block关键字，以防止它被块保留。