Question

我尝试使用我在Google上找到的项目中的Parse实现搜索栏，但我遇到了问题。

它显示//my problem的两行导致应用崩溃

if (self.canSearch == 0) {
//my problem   query = [PFQuery queryWithClassName:self.parseClassName];
} else {
//my problem   query = [PFQuery queryWithClassName:self.parseClassName];
}

中的

-(PFQuery *)queryForTable {

    PFQuery *query;
    if (self.canSearch == 0) {
        query = [PFQuery queryWithClassName:self.parseClassName];
    } else {
        query = [PFQuery queryWithClassName:self.parseClassName];
    }

    NSString *searchThis = [_searchedBar.text lowercaseString];

    [query whereKey:@"item1" containsString:searchThis];

    }

    [query orderByAscending:@"item1"];

    // If Pull To Refresh is enabled, query against the network by default.
    if (self.pullToRefreshEnabled) {
        query.cachePolicy = kPFCachePolicyNetworkOnly;
    }

    // If no objects are loaded in memory, we look to the cache first to fill the table
    // and then subsequently do a query against the network.
    if (self.objects.count == 0) {
        query.cachePolicy = kPFCachePolicyCacheThenNetwork;
    }

    return query;
}

我不确定是什么错，因为它适用于我正在为之工作的项目。

这就是应用程序崩溃时在控制台中所说的内容

libc++abi.dylib: terminating with uncaught exception of type NSException

Answer 1

您确定的那些线几乎肯定不是问题。这里有一个神奇的技巧：NSLog(@"%@", _searchedBar);可能会显示_searchedBar未定义，因此.text，因此导致崩溃的whereKey参数。

另请注意：

if (anything) {
    something
} else {
    something
}

可以更简洁地说：

something

用Parse实现搜索栏的问题

1 个答案: