IBOutlet 为 nil，但在 storyboard 中连接，Swift [英] IBOutlet is nil, but it is connected in storyboard, Swift

问题描述

使用 Swift 1.1 和 Xcode 6.2.

Using Swift 1.1 and Xcode 6.2.

我有一个 UIStoryboard，其中包含一个单一的自定义 UIViewController 子类.在它上面，我有一个 @IBOutlet 类型的 UIView 连接，从那个控制器到故事板上的 UIView subclass.对于该视图的子视图，我也有类似的出口.见图A.

I have a UIStoryboard containing a singular, custom UIViewController subclass. On it, I have an @IBOutlet connection of type UIView from that controller to a UIView subclass on the storyboard. I also have similar outlets for subviews of that view. See figure A.

但在运行时，这些属性为零(图B).即使我已经保证我已经连接了 Interface Builder 中的插座.

But at run time, these properties are nil (Figure B). Even though I have assured I've connected the outlets in Interface Builder.

想法:

• 是否有可能因为我使用子类的子类而导致初始化混乱?我没有覆盖任何初始化程序
• awakeFromNib: 由于某种原因没有被调用
• 也许它没有连接到子视图上的子视图

• Is it possible that because I am using a subclass of a subclass something messes up with the initialization? I am not overriding any initializers
• awakeFromNib: is not getting called for some reason
• Maybe it doesn't connecting to subviews on subviews

我尝试过的事情:

• 完全匹配 @IBOutlet 和故事板项目类型(而不是 UIView)
• 删除属性和插座并重新添加它们

• Matching @IBOutlet and storyboard item types exactly (instead of UIView)
• Deleting property and outlet and re-added them

图A*

图B

*图A中被遮挡的代码是:

@IBOutlet private var annotationOptionsView: UIView!
@IBOutlet private var arrivingLeavingSwitch: UISegmentedControl!

谢谢.

推荐答案

故事板无法识别我添加到其中的任何其他 UI 内容.在运行时，所有引用都为零.所以我清除了我的派生数据文件夹，然后这些连接再次工作.

The storyboard wasn't recognizing any further UI things I added to it. At run time all the references were nil. So I cleared my derived data folder and then those connections worked again.

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