ActionSheet Test

app_delegate.rb

class AppDelegate
  def application(application, didFinishLaunchingWithOptions:launchOptions)
    @window = UIWindow.alloc.initWithFrame(UIScreen.mainScreen.bounds)
    @viewController = UIViewController.alloc.init
    @viewController.navigationItem.rightBarButtonItem = UIBarButtonItem.alloc.initWithBarButtonSystemItem(UIBarButtonSystemItemAction, target:self, action:'tapped:')
    @window.rootViewController = UINavigationController.alloc.initWithRootViewController(@viewController)
    @window.rootViewController.wantsFullScreenLayout = true
    @window.makeKeyAndVisible
    true
  end

  def tapped(sender)
    # Failed
    actionSheet = UIActionSheet.alloc.initWithTitle("Test", delegate:self, cancelButtonTitle:"Cancel", destructiveButtonTitle:nil, otherButtonTitles:"WRYYY", "View Info")
    actionSheet.showInView(@viewController.view)

    # Passed
    # @actionSheet ||= UIActionSheet.alloc.initWithTitle("Test", delegate:self, cancelButtonTitle:"Cancel", destructiveButtonTitle:nil, otherButtonTitles:"WRYYY", "View Info")
    # @actionSheet.showInView(@viewController.view)
  end
end

よくわかりませんが、謎動作であることだけは確信が持てました。

class AppDelegate
  def application(application, didFinishLaunchingWithOptions:launchOptions)
    @window = UIWindow.alloc.initWithFrame(UIScreen.mainScreen.bounds)
    @viewController = UIViewController.alloc.init
    @viewController.navigationItem.rightBarButtonItem = UIBarButtonItem.alloc.initWithBarButtonSystemItem(UIBarButtonSystemItemAction, target:self, action:'tapped:')
    @viewController.view.backgroundColor = UIColor.whiteColor
    @window.rootViewController = UINavigationController.alloc.initWithRootViewController(@viewController)
    @window.rootViewController.wantsFullScreenLayout = true
    @window.makeKeyAndVisible
    true
  end

  def tapped(sender)
    actionSheet = UIActionSheet.alloc.initWithTitle("Test", delegate:self, cancelButtonTitle:"Cancel", destructiveButtonTitle:nil, otherButtonTitles:"WRYYY", "View Info")
    p actionSheet # ここをコメントアウトすると落ちる
  end
end

サポートチケットを投げたところLaurentから返事をもらいました。許可をもらったのでそのまま転載します。これで解決しました。

The crash sometimes happens because the otherButtonTitles argument is supposed to be a nil-terminated list. If nil is not passed, the method will keep scanning the arguments on the stack.

Changing this line

actionSheet = UIActionSheet.alloc.initWithTitle("Test", delegate:self, cancelButtonTitle:"Cancel", destructiveButtonTitle:nil, otherButtonTitles:"WRYYY", "View Info")

to

actionSheet = UIActionSheet.alloc.initWithTitle("Test", delegate:self, cancelButtonTitle:"Cancel", destructiveButtonTitle:nil, otherButtonTitles:"WRYYY", "View Info", nil)

might fix the problem.