访问@IBInspectable UIImage时，接口构建器代理崩溃 [英] Interface builder agent crashes when accessing @IBInspectable UIImage

问题描述

我正在通过继承 UIView 并使用 @IBInspectable 为我的一些变量实现自定义视图。其中两个是UIImage。如果我尝试在代码中访问其中一个，则界面构建器将崩溃并显示以下消息：

I'm implementing a custom view by subclassing UIView and using @IBInspectable for some of my variables. Two of them are UIImage. If I try to access one of them in the code, the interface builder crashes with the following message:

file:///PathToMyProject/MyProject/Pod/Classes/UI/View/MyView.xib: error: IB Designables: Failed to update auto layout status: The agent crashed

和

file:///PathToMyProject/MyProject/Pod/Classes/UI/View/MyView.xib: error: IB Designables: Failed to render instance of MyView: The agent crashed

一切都在模拟器和设备上运行良好。
以下是如何重现它，假设 image_one.png 在资产中：

Everything runs fine on simulator and device. Here's how you can reproduce it, assumed image_one.png is in the assets:

import UIKit

@IBDesignable
class MyView: UIView {

    @IBInspectable
    var anImage: UIImage = UIImage(named: "image_one")!

}

事实上，界面构建器代理在初始化此变量时崩溃。如果你写 var anImage：UIImage！ = UIImage（名为：image_one），然后代理在访问此变量时崩溃（如上所述）。

In fact the interface builder agent crashes at initializing this variable. If you write var anImage: UIImage! = UIImage(named: "image_one"), then the agent crashes when accessing this variable (as stated above).

任何想法？

推荐答案

问题是Interface Builder中的图像路径与应用程序中的路径不同，因此IB正在取消引用nil图像。您可以通过使用选项，然后在IB中的属性检查器中设置图像来解决此问题。

The problem is that paths to images are different in Interface Builder than they are in your app, so IB is dereferencing a nil image. You can fix this by using optionals and then setting the image in the Attributes inspector in IB.

以下是更新后的代码：

import UIKit

@IBDesignable
class MyView: UIView {

    @IBInspectable
    var anImage: UIImage? = UIImage(named: "image_one")

}

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