ios - EXC_BREAKPOINT UNKNOWN 在 "0"行崩溃

Question

我在 Crashlytics 报告中遇到了这个奇怪的崩溃，我不确定发生了什么。我什至不知道行号“0”是什么意思。有任何想法吗？

didSelect 方法的代码:

func tableView(tableView: UITableView, didSelectRowAtIndexPath indexPath: NSIndexPath) {

    switch indexPath.section {

    case 1:
        let vc = WTShowDetailVC()
        vc.show = bottomFeaturedShows[indexPath.row].show
        navigationController?.pushViewController(vc, animated: true)

    case 2:
        let vc = WTShowDetailVC()
        vc.show = lastWatchedShows[indexPath.row]
        navigationController?.pushViewController(vc, animated: true)

    case 3:
        let vc = WTTapperProfileUserVC()
        vc.tapper = popularTappers[indexPath.row]
        navigationController?.pushViewController(vc, animated: true)

    default:
        println("Something went wrong")
    }
}

Answer 1

这通常发生在您展开可选值且其值为 nil 时。尝试将 nil 检查到 navigationController。

if let navigationcontroller: UINavigationController = navigationController { 
    navigationcontroller.pushViewController(vc, animated: true) 
}