从NSDictionary计算allKeys会返回EXC_BAD_ACCESS

Question

我正在尝试将NSDictionary发送到TableViewController,数据最初来自.plist文件.我只想将层次结构中存在的对象发送到新的TableViewController.但是当我尝试计算numberOfSectionsInTableView中的项目数时会出现问题.

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {   
// Gets the dictionary for the currently selected row
NSDictionary *dict = [[data objectForKey:[[data allKeys] objectAtIndex:indexPath.section]] objectAtIndex:indexPath.row];

// Checks if the key "Room" exists
if([dict objectForKey:@"Room"]) {
    SalesFairSessionTableViewController *sessionViewController = [[SalesFairSessionTableViewController alloc] init];

    // Sets the data in the subview Controller
    [sessionViewController setData:[dict objectForKey:@"Room"]];

    // And the title
    [sessionViewController setTitle:[dict objectForKey:@"Title"]];

    // Problem is here... returns EXC_BAD_ACCESS
    NSLog(@"%@", [[[dict objectForKey:@"Room"] allKeys] count]);

    [self.navigationController pushViewController:sessionViewController animated:YES];
    [sessionViewController release];
}
}

如果我只是使用allKeys:

NSLog([[dict objectForKey:@"Room"] allKeys]);

它在控制台中返回("Item 1","Item 2").

但是,当我添加这样的"计数"方法时:

NSLog(@"%@", [[[dict objectForKey:@"Room"] allKeys] count]);

我得到:程序接收信号:"EXC_BAD_ACCESS".

我在这里错过了什么？

Answer 1

NSLog(@"%@", [[[dict objectForKey:@"Room"] allKeys] count]);

count给出一个int,但你打印时%@,期望指向一个对象的指针.请%d改用.