UISplitViewController displayModeButtonItem()

Question

有人知道改变文本(和外观)的方法吗？从UISplitViewController委托返回的按钮：

func displayModeButtonItem() -> UIBarButtonItem?

Answer 1

我自己解决这个问题的方法是：

UIBarButtonItem(image: UIImage(named:"home"),
            landscapeImagePhone: UIImage(named:"home"),
            style: UIBarButtonItemStyle.Plain,
            target: splitViewController.displayModeButtonItem().target,
            action: splitViewController.displayModeButtonItem().action)

我在AppDelegate中使用它，而不是在splitViewController.displayModeButtonItem()中，它对我来说很好。

Answer 2

在我的解决方案中，我结合了josh和Voluntas88的解决方案。

首先需要使用UISplitViewControllerDelegate方法func targetDisplayModeForActionInSplitViewController(_ svc: UISplitViewController) -> UISplitViewControllerDisplayMode，然后添加一个定制的UIBarButtonItem。以下是我的解决方案：

func targetDisplayModeForActionInSplitViewController(svc: UISplitViewController) -> UISplitViewControllerDisplayMode {
        if svc.displayMode == UISplitViewControllerDisplayMode.PrimaryHidden || svc.displayMode == UISplitViewControllerDisplayMode.PrimaryOverlay {
            self.navigationItem.leftBarButtonItem = UIBarButtonItem(image: UIImage(named:"menu.png"),
                landscapeImagePhone: UIImage(named:"menu.png"),
                style: UIBarButtonItemStyle.Plain,
                target: self.splitViewController!.displayModeButtonItem().target,
                action: self.splitViewController!.displayModeButtonItem().action)
        }else {
// disable button on landscape
            if UIApplication.sharedApplication().statusBarOrientation == UIInterfaceOrientation.LandscapeLeft || UIApplication.sharedApplication().statusBarOrientation == UIInterfaceOrientation.LandscapeRight {
                self.navigationItem.leftBarButtonItem?.enabled = false
            }
        }
        return UISplitViewControllerDisplayMode.Automatic
    }

Answer 3

在targetDisplay中这样做是可行的，但在旋转结束时可以看到按钮的移除/添加，最好在splitViewController:willChangeToDisplayMode:displayMode中这样做，但请记住，这也应该在viewDidLoad上处理，因为该委托方法在启动时不会被调用。

 - (void)splitViewController:(UISplitViewController *)svc willChangeToDisplayMode:(UISplitViewControllerDisplayMode)displayMode
    {
        if (displayMode == UISplitViewControllerDisplayModePrimaryHidden || displayMode == UISplitViewControllerDisplayModePrimaryOverlay) {
            self.navigationItem.leftBarButtonItem = [[UIBarButtonItem alloc] initWithTitle:@"Lista" style:UIBarButtonItemStylePlain target:self.splitViewController.displayModeButtonItem.target action:self.splitViewController.displayModeButtonItem.action];
        } else {
           self.navigationItem.leftBarButtonItem = nil;
        }
    }