我正试图每天花钱,让我去做,并确保我在保留和释放之间保持平衡。

在这方面,我感到迷惑。 我有:

NSMutabledata *_alignmentData 

并综合与其相关的财产:

// .h file
@property (nonatomic, retain) NSMutableData *alignmentData;

// .m file
@synthesize alignmentData=_alignmentData;

我开始逐年从服务器中提取数据:

self.connection = 
[[[NSURLConnection alloc] initWithRequest:theRequest delegate:self] autorelease];

紧接着,在分配数据缓冲之后,将随后用于破碎的警示:

// This prints 0. Cool.
NSLog(@"BEFORE [_alignmentData retainCount] = %d", [_alignmentData retainCount]);

// Create a place to receive the data that will arrive asynchronously:
self.alignmentData = [NSMutableData data];

// This prints 2. Shouldn t this be 1 ?!?
NSLog(@" AFTER [_alignmentData retainCount] = %d", [_alignmentData retainCount]);

在上述自我分配之后,火上首当其冲,使问题复杂化。 一致性 数据,我再次检查保留:

- (void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response {

    // This prints 1. 
    NSLog(@"[_alignmentData retainCount] = %d", [_alignmentData retainCount]);
    [self.alignmentData setLength:0];

}

因此,保留额似乎从0降至1。 谁能向我解释,这怎么可能?

注:我被告知不要把计数作为欺骗性援助,但这根本不适用于非垃圾收集的语言,如目标C。