如何使用IBDesignable UIImageView在prepareForInterfaceBuilder中加载图像 [英] How to load an image in prepareForInterfaceBuilder with a IBDesignable UIImageView

问题描述

我想在IB可设计 UIImageView 中加载示例图像，以便在编辑界面时在Interface Builder中显示。以下代码不起作用，因为IB中的视图占位符保持为空（视图区域仅包含UIImageView文本）：

I would like to load a sample image in an IB designable UIImageView, to be shown in Interface Builder while editing the interface. The following code does not work, as the view placeholder in IB remains empty (the view area contains only the UIImageView text):

@IBDesignable
class TestImageView : UIImageView
{
    override func prepareForInterfaceBuilder() {
        //let bundle = NSBundle.mainBundle()
        let bundle = NSBundle(forClass: nil)
        let imagePath = bundle.pathForResource("Test", ofType: "jpg")
        self.image = UIImage(contentsOfFile: imagePath)
    }
}

请注意：

• 在IB中，视图的自定义类类是正确的（TestImageView）


• 项目中存在Test.jpg（如果我手动设置的图像属性UIImageView 在IB中，图像显示出来。）


• 我尝试了两种不同的方法来获取代码中的包

• in IB the Custom Class class for the view is correct (TestImageView)
• Test.jpg is present in the project (if I manually set the image property of the UIImageView in IB the image shows up).
• I tried the two different methods of getting the bundle present in the code

这是使用Xcode 6 beta 3测试的。

This was tested with Xcode 6 beta 3.

更新吃了：在这两种情况下，我得到的包路径是/ Applications / Temporary / Xcode6-Beta3.app / Contents / Developer / Platforms / iPhoneSimulator.platform / Developer / Library / Xcode / Overlays 。在该路径中，图像显然不存在。

Update: in both cases the bundle path I get is "/Applications/Temporary/Xcode6-Beta3.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/Library/Xcode/Overlays". In that path the image is obviously not present.

推荐答案

在Swift 4.1中，@ kasplat的代码已更改为：

In Swift 4.1 the code of @kasplat has changed to:

    // DYNAMIC BUNDLE DEFINITION FOR DESIGNABLE CLASS
    let designTimeBundle = Bundle(for: type(of: self))

    // OR ALTERNATIVELY BY PROVDING THE CONCRETE NAME OF YOUR DESIGNABLE VIEW CLASS
    let designTimeBundle = Bundle(for: YourDesignableView.self)

    // AND THEN SUCCESSFULLY YOU CAN LOAD THE RESSOURCE
    let image = UIImage(named: "Logo", in: designTimeBundle, compatibleWith: nil)

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