今天用到 NSMutableDictionary 在alloc之後 很自然的就補了release 想要觀察有沒有放乾淨 所以使用了retainCount卻發生了錯誤 NSMutableDictionary* jsonObject = [[NSMutableDictionary alloc] init] ; [jsonObject setObject:account forKey:@"username"]; [jsonObject setObject:password forKey:@"password"]; [jsonObject setObject:@"2" forKey:@"source"]; NSString *jsonInput = [jsonObject JSONRepresentation]; NSLog(@"jsonObject RetanCount:%@", [jsonObject retainCount]); //Bad_Access Here 爬了一下文，原來arc在建立NSMutableDictionary這類的物件時。便已經會自動使用autorelease 因此不支援retainCount 值得注意的是 當NSMutableDictionary裡面每增加一個物件(KEY)時 該NSMutableDictionary的retain便會自動加一 不過在新的arc功能下 已經不用那麼在意retain值了。 You shouldn't use -retainCount to figure out what is going on. The Apple docs specifically state: Important: This method is typically of no value in debugging memory management issues. Because any number of framework objects may have retained an object in order to hold refer...
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