如何在iPad的详细视图中选择默认项目？ （在Split View Controller中）

Question

我使用的是拆分视图控制器。对于iPad，当应用程序启动时，我想在主视图控制器的第一项中选择。那我怎么能在Swift中做到这一点？谢谢！

Answer 1

我解决了这个问题。我写信是为了将来帮助别人。

func viewDidLoad() {
        //..
        let initialIndexPath = NSIndexPath(forRow: 0, inSection: 0)
        self.tableView.selectRowAtIndexPath(initialIndexPath, animated: true, scrollPosition:UITableViewScrollPosition.None)

        if UIDevice.currentDevice().userInterfaceIdiom == .Pad {
            self.performSegueWithIdentifier("ShowDetail", sender: initialIndexPath)
        }
}

func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
        if segue.identifier == "ShowDetail" {
            if sender!.isKindOfClass(UITableViewCell) {
                if let indexPath = self.tableView.indexPathForCell(sender as! UITableViewCell) {

                    // Get row from selected row in tableview

                }
            } else if sender!.isKindOfClass(NSIndexPath) {
                let tableCell = self.tableView.cellForRowAtIndexPath(sender as! NSIndexPath)
                let indexPath = self.tableView.indexPathForCell(tableCell!)

                // Get row from sender, which is an NSIndexPath
            }
        }
}

Answer 2

转换为Swift 3：

        let initialIndexPath = IndexPath(row: 0, section: 0)
        self.tableView.selectRow(at: initialIndexPath, animated: true, scrollPosition:UITableViewScrollPosition.none)

        if UIDevice.current.userInterfaceIdiom == .pad {
            self.performSegue(withIdentifier: Constants.Segues.showDetail, sender: initialIndexPath)
        }

Answer 3

修复自动错误后转换为Swift 5

let initialIndexPath = NSIndexPath(row: 0, section: 0)
        self.tableView.selectRow(at: initialIndexPath as IndexPath, animated: true, scrollPosition:UITableView.ScrollPosition.none)

        if UIDevice.current.userInterfaceIdiom == .pad {
            self.performSegue(withIdentifier: "ShowDetail", sender: initialIndexPath)
        }