如何在 SwiftUI 中访问视图的修饰符? [英] How can I access modifiers of a view in SwiftUI?
问题描述
假设我有一个带有 Image
的 View
,它有一个 shadow
属性:
Assume I have a View
with an Image
that has a shadow
property:
struct ContentView: View {
var body: some View {
let myImage = Image("turtlerock").shadow(radius: 10)
return myImage
}
}
现在想象我想访问阴影半径的值.我以为我可以这样做:
Now imagine I want to access the value of the shadow radius. I assumed I could do this:
print(myImage.shadow.radius)
然而,这会返回一个错误:
However, this returns an error:
'(Color, Length, Length, Length) -> _ModifiedContent<_ModifiedContent, _ShadowEffect>' (aka '(Color, CGFloat, CGFloat, CGFloat) -> _ModifiedContent<_ModifiedContent, _ShadowEffect>') 类型的值没有成员'半径'
Value of type '(Color, Length, Length, Length) -> _ModifiedContent<_ModifiedContent, _ShadowEffect>' (aka '(Color, CGFloat, CGFloat, CGFloat) -> _ModifiedContent<_ModifiedContent, _ShadowEffect>') has no member 'radius'
有没有办法访问修饰符?
Is there a way to access the modifier?
推荐答案
myImage
的返回类型为:
_ModifiedContent<Image, _ShadowEffect>
我们可以通过以下方式访问原始图像:
We can access the original image by doing:
myImage.content
我们可以通过键入以下内容访问阴影效果修饰符:
We can access the shadow effect modifier by typing:
myImage.modifier
所以要做你想做的事,你必须输入:
So to do what you want, you have to type:
print(myImage.modifier.radius)
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