Question

我在试图利用ARC公司(ARC)的以下法典时正在发现这一错误:

NSMutableArray *rows = [[NSMutableArray alloc] init];
sqlite3_exec(database, "select distinct category from billy", callback, rows, NULL);

任何人都知道如何解决这一问题?

Answer 1

Be warned that I never do ARC, but casting rows parameter to (__bridge_retained void *) should help if I understand the document correctly.

Here is the code I use for testing.

static int myCallback(void* ptr, int i, char** p1, char** p2) {
    NSMutableArray* array = (__bridge_transfer NSMutableArray*)ptr;
    return 0;
}

- (void)viewDidAppear:(BOOL)animated
{
    [super viewDidAppear:animated];
    NSMutableArray *rows = [[NSTestMutableArray alloc] init];
    sqlite3_exec(NULL, "select distinct category from billy", &myCallback, (__bridge_retained CFMutableArrayRef)rows, NULL);
}

(__bridge_ transfer ) is for transfer the Owner Back, so ARC will release it disabilities. 我凌驾于我的《国家试验报》中的交易,以表明它确实是被分配的,如果我评论“桥梁——转让线”的话,它就赢得了一笔交易。

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