swift - iPhone 上纵向的 UISplitViewController 在 iOS 8 中始终显示主视图和细节

Question

iPhone 上 portrait 中的

UISplitViewController 在 iOS 8 中始终显示 master 和 detail

我尝试继承 UISplitViewController 并将其配置为同时显示 master 和 detail。但没有任何影响。

class APPSplitViewController: UISplitViewController, UISplitViewControllerDelegate {

    override func viewDidLoad() {

        super.viewDidLoad()
        preferredDisplayMode = UISplitViewControllerDisplayMode.AllVisible
        maximumPrimaryColumnWidth = 32.0
        minimumPrimaryColumnWidth = 32.0
    }

    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
    }
}

怎么做？

Answer 1

UISplitViewController 仅在水平常规环境中使用并排显示(新的 TraitCollection 大小)

The split view controller determines the arrangement of its child view controllers based on the available space. In a horizontally regular environment, the split view controller presents its view controllers side-by-side whenever possible. In a horizontally compact environment, the split view controller acts more like a navigation controller, displaying the primary view controller initially and pushing or popping the secondary view controller as needed. You can also ask the split view controller to prefer a specific arrangement by assigning a value to the preferredDisplayMode property.

解决方案。您必须更改 SplitViewController 的 TraitCollection。怎么做:

• 创建一个 ViewController 并将您的 SplitViewController 添加为 subview 。
• 为您的 child (UISplitViewController) 用 size.Regular 覆盖 traitCollection

ViewController 包装器

class TraitOverrideViewController: UIViewController {

 override func viewDidLoad() {
    super.viewDidLoad()
    configureSplitVC()
  }


  private func configureSplitVC() {

    let splitVC = self.childViewControllers[0] as UISplitViewController
    setOverrideTraitCollection(UITraitCollection(horizontalSizeClass: .Regular), forChildViewController: splitVC)
  }
}

在 iOS 8 中，UISplitViewController 使用 Adaptive User Interfaces和 TraitCollections 以显示其内容。
它根据 View 的大小和类型显示不同的样式。您可以根据我上面解释的技术进行更改。
您可以在有关 Building Adaptive Apps with UIKit 的 WWDC 视频中获得更多信息