Swift 中的外观代理/UI_APPEARANCE_SELECTOR? [英] Appearance proxies / UI_APPEARANCE_SELECTOR in Swift?

问题描述

Apple 文档指出:

The Apple documentation states:

要参与外观代理API，请标记您的外观带有 UI_APPEARANCE_SELECTOR 的标题中的属性选择器.

To participate in the appearance proxy API, tag your appearance property selectors in your header with UI_APPEARANCE_SELECTOR.

在 Objective-C 中，可以像这样使用 UI_APPEARANCE_SELECTOR 注释属性:

In Objective-C one can annotate properties with UI_APPEARANCE_SELECTOR like this:

@property (nonatomic, strong) UIColor *foregroundColor UI_APPEARANCE_SELECTOR;

如何在 Swift 中执行相同的操作?

推荐答案

将您的自定义视图属性标记为 dynamic.

Mark your custom view property as dynamic.

例如:

class YourCustomView: UIView {
    @objc dynamic var subviewColor: UIColor? {
        get { return self.yourSubview.backgroundColor }
        set { self.yourSubview.backgroundColor = newValue }
    }
    ...
}

那么:

YourCustomView.appearance().subviewColor = UIColor.greenColor()

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