如何“取消”一个UIStoryBoardSegue

问题描述

有没有人知道如何有条件地停止segue过渡：

Does anyone know how to "stop" a segue transition conditionally:

我的表格视图单元格代表可以在深入详细信息视图中查看的产品......还是不行！ （这取决于几件事情）

My table view cells represent products which can be viewed in a drill-down "detail" view... or cannot! (It depends on a couple of things)

现在我的应用认为所有产品都解锁：

Now my App considers all products "unlocked":

- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender
{
    NSIndexPath *selectedRowIndex = [self.tableView indexPathForSelectedRow];
    ListaProdottiController *prodottiViewController = [segue destinationViewController];
    prodottiViewController.blocco = [self.fetchedResultsController objectAtIndexPath:selectedRowIndex];
}

此时如何取消行选择=>向下钻取？

How can I cancel the row selection => drilldown, at this point?

推荐答案

如果您的目标是iOS 6或更高版本，那么我对最干净的方法的了解如下：

If you are targeting iOS 6 or greater, then my knowledge of the cleanest way to do this is the following:

-(BOOL)shouldPerformSegueWithIdentifier:(NSString *)identifier sender:(id)sender
{
    if([identifier isEqualToString:@"show"])
    {
        NSIndexPath *selectedRowIndex = [self.tableView indexPathForSelectedRow];
        Blocco *blocco = [self.fetchedResultsController objectAtIndexPath:selectedRowIndex];
        return [blocco meetRequiredConditions];
    }
    return YES;
}

哪里有方法

-(BOOL) meetsRequiredConditions;

如果允许向下钻取的几件事情是在你的Blocco类中定义，则返回YES有效。

Defined on your Blocco class returns YES if the "couple of things" which permit a drill-down are valid.

这篇关于如何“取消”一个UIStoryBoardSegue的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！