Swift 2:"Bool"不可转换为"BooleanLiteralConvertible" [英] Swift 2: "Bool' is not convertible to 'BooleanLiteralConvertible'

问题描述

我在XCode 6中创建了一个应用.今天，我下载了XCode 7，它已将我的应用程序更新为Swift 2.有很多错误，但是现在只有一个我无法解决. 我不知道为什么，但是Xcode不喜欢animated的任何Bool选项并显示此错误-

I created an app in XCode 6. Today I downloaded XCode 7 and it had updated my app to Swift 2. There were a lot of errors, but now there is only one that I can't solve. I don't know why, but Xcode doesn't like any Bool option for animated and show this error -

布尔"不能转换为"BooleanLiteralConvertible"

'Bool' is not convertible to 'BooleanLiteralConvertible'

(如果您看一下函数本身，就会发现，它完全用Bool代替animated)

(if you look at the function itself, you will see, that it takes exactly the Bool for animated)

var startVC = self.viewControllerAtIndex(indexImage) as ContentViewController
var viewControllers = NSArray(object: startVC)

self.pageViewContorller.setViewControllers(viewControllers as [AnyObject], direction: UIPageViewControllerNavigationDirection.Forward, animated: true, completion: nil)
    'Bool' is not convertible to 'BooleanLiteralConvertible'

有人知道，我该怎么解决?

Does anybody know, how can I solve it?

谢谢.

推荐答案

Swift令人困惑，并给您不正确的错误消息.问题在于第一个参数的类型为[UIViewController]?，因此以下代码应该起作用:

Swift is confused and giving you an incorrect error message. The problem is that the first parameter is of type [UIViewController]?, so the following should work:

self.pageViewContorller.setViewControllers(viewControllers as? [UIViewController], direction: UIPageViewControllerNavigationDirection.Forward, animated: true, completion: nil)

甚至更好，将viewControllers声明为[UIViewController]类型，然后在调用中不需要强制转换:

Or even better, declare viewControllers to be of type [UIViewController] then no casting is needed in the call:

let viewControllers:[UIViewController] = [startVC]
self.pageViewContorller.setViewControllers(viewControllers, direction: UIPageViewControllerNavigationDirection.Forward, animated: true, completion: nil)

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