在iOS8中使用UISplitViewController隐藏主视图控制器

Question

我有一个iOS7应用程序,它基于Xcode主 - 详细信息模板,我移植到iOS8.一个变化很大的领域是UISplitViewController.

在纵向模式下,如果用户点击详细视图控制器,则主视图控制器将被关闭:

如果用户点击一行,我还希望能够以编程方式隐藏主视图控制器.

在iOS 7中,主视图控制器显示为弹出窗口,可以隐藏如下:

[self.masterPopoverController dismissPopoverAnimated:YES];

使用iOS 8,主服务器不再是popover,因此上述技术不起作用.

我试图解雇主视图控制器:

self.dismissViewControllerAnimated(true, completion: nil)

或者告诉拆分视图控制器显示详细信息视图控制器:

self.splitViewController?.showDetailViewController(bookViewController!, sender: self)

但到目前为止还没有任何工作.有任何想法吗？

Answer 1

按如下方式扩展UISplitViewController:

extension UISplitViewController {
    func toggleMasterView() {
        let barButtonItem = self.displayModeButtonItem()
        UIApplication.sharedApplication().sendAction(barButtonItem.action, to: barButtonItem.target, from: nil, forEvent: nil)
    }
}

在didSelectRowAtIndexPath或中prepareForSegue,执行以下操作:

self.splitViewController?.toggleMasterView()

这将使主视图平滑地滑动.

我从这篇文章中得到了使用displayModeButtonItem()的想法,我正在模拟按照这篇文章点击它.

我对这个解决方案并不满意,因为它看起来像是一个黑客.但它运作良好,似乎没有其他选择.

Answer 2

使用preferredDisplayMode.在didSelectRowAtIndexPath或prepareForSegue:

self.splitViewController?.preferredDisplayMode = .PrimaryHidden
self.splitViewController?.preferredDisplayMode = .Automatic

不幸的是,主视图突然消失而不是滑离,尽管文档说明:

如果更改此属性的值会导致当前显示模式的实际更改,则拆分视图控制器会对生成的更改进行动画处理.

希望有一个更好的方法来实现这个实际动画变化.

Answer 3

我能有期望的行为在Xcode的6.3主从应用程序(通用)项目由加入如下代码MasterViewController的- prepareForSegue:sender:方法:

if view.traitCollection.userInterfaceIdiom == .Pad && splitViewController?.displayMode == .PrimaryOverlay {
    let animations: () -> Void = {
        self.splitViewController?.preferredDisplayMode = .PrimaryHidden
    }
    let completion: Bool -> Void = { _ in
        self.splitViewController?.preferredDisplayMode = .Automatic
    }
    UIView.animateWithDuration(0.3, animations: animations, completion: completion)
}

完整的- prepareForSegue:sender:实现应如下所示:

override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
    if segue.identifier == "showDetail" {
        if let indexPath = self.tableView.indexPathForSelectedRow() {
            let object = objects[indexPath.row] as! NSDate
            let controller = (segue.destinationViewController as! UINavigationController).topViewController as! DetailViewController
            controller.detailItem = object
            controller.navigationItem.leftBarButtonItem = self.splitViewController?.displayModeButtonItem()
            controller.navigationItem.leftItemsSupplementBackButton = true

            if view.traitCollection.userInterfaceIdiom == .Pad && splitViewController?.displayMode == .PrimaryOverlay {
                let animations: () -> Void = {
                    self.splitViewController?.preferredDisplayMode = .PrimaryHidden
                }
                let completion: Bool -> Void = { _ in
                    self.splitViewController?.preferredDisplayMode = .Automatic
                }
                UIView.animateWithDuration(0.3, animations: animations, completion: completion)
            }
        }
    }
}

使用traitCollection也可能是displayMode某些项目的替代/补充.例如,以下代码也适用于Xcode 6.3 Master-Detail Application(通用)项目:

let traits = view.traitCollection
if traits.userInterfaceIdiom == .Pad && traits.horizontalSizeClass == .Regular {
    let animations: () -> Void = {
        self.splitViewController?.preferredDisplayMode = .PrimaryHidden
    }
    let completion: Bool -> Void = { _ in
        self.splitViewController?.preferredDisplayMode = .Automatic
    }
    UIView.animateWithDuration(0.3, animations: animations, completion: completion)
}

Answer 4

下面的代码用动画隐藏主视图

UIView.animateWithDuration(0.5) { () -> Void in
            self.splitViewController?.preferredDisplayMode = .PrimaryHidden
        }

Answer 5

只是稍微改善了此处列出的答案，以下代码对我来说正常工作，并且还可以流畅地处理动画：

extension UISplitViewController {
    func toggleMasterView() {
        var nextDisplayMode: UISplitViewControllerDisplayMode
        switch(self.preferredDisplayMode){
        case .PrimaryHidden:
            nextDisplayMode = .AllVisible
        default:
            nextDisplayMode = .PrimaryHidden
        }
        UIView.animateWithDuration(0.5) { () -> Void in
            self.preferredDisplayMode = nextDisplayMode
        }
    }
}

然后，如上所述，您只需在View控制器中的任何位置使用扩展功能

self.splitViewController?.toggleMasterView()

Answer 6

斯威夫特 4 更新：

将其插入准备（用于segue：...

if splitViewController?.displayMode == .primaryOverlay {
    let animations: () -> Void = {
        self.splitViewController?.preferredDisplayMode = .primaryHidden
    }
    let completion: (Bool) -> Void = { _ in
        self.splitViewController?.preferredDisplayMode = .automatic
    }
    UIView.animate(withDuration: 0.3, animations: animations, completion: completion)
}