SplitViewController 在使用之前应该在索引 0 处有一个视图控制器吗？

Question

每次我显示拆分视图控制器时，我都会在控制台中收到此错误。我找不到具体的解决方案？指导？

func application(application: UIApplication, didFinishLaunchingWithOptions launchOptions: [NSObject: AnyObject]?) -> Bool {

    window = UIWindow(frame: UIScreen.mainScreen().bounds)
    window?.makeKeyAndVisible()
    let splitViewController = UISplitViewController()
    let masterViewController = TabBarMaster(collectionViewLayout: UICollectionViewFlowLayout())
    let detailViewController = UINavigationController()

    splitViewController.maximumPrimaryColumnWidth = 80

    splitViewController.preferredDisplayMode = .AllVisible
    splitViewController.delegate = self
    splitViewController.viewControllers = [masterViewController, detailViewController]
    window?.rootViewController = splitViewController

    return true
}

Answer 1

在设置 splitViewController 的任何其他属性之前设置 splitViewController viewControllers 数组：

func application(application: UIApplication, didFinishLaunchingWithOptions launchOptions: [NSObject: AnyObject]?) -> Bool {

    window = UIWindow(frame: UIScreen.mainScreen().bounds)
    window?.makeKeyAndVisible()
    let splitViewController = UISplitViewController()
    let masterViewController = TabBarMaster(collectionViewLayout: UICollectionViewFlowLayout())
    let detailViewController = UINavigationController()

    splitViewController.viewControllers = [masterViewController, detailViewController] // move it here

    splitViewController.maximumPrimaryColumnWidth = 80
    splitViewController.preferredDisplayMode = .AllVisible
    splitViewController.delegate = self
    window?.rootViewController = splitViewController

    return true
}

SplitViewController 在使用之前应该在索引 0 处有一个视图控制器吗？

SplitViewController is expected to have a view controller at index 0 before it used?

uisplitviewcontroller

ios

swift