如何在iPad的详细视图中选择默认项目？（在分割视图控制器中）

Question

我正在使用分栏视图控制器。对于iPad，当应用程序启动时，我想在主视图控制器中选择第一项。那么我该如何在Swift中实现呢？谢谢！

- etnclp

Answer 1

我解决了这个问题。我写这篇文章是为了帮助未来的其他人。

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
            }
        }
}

- etnclp

Answer 2

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)
}

- Fortuntato

Answer 3

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)
}

- zorro2b

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这段代码应该放在哪里？我的 NewsViewController 子类没有 tableView 成员？ - J.Doe