英文:
How to access VStack from within its onAppear closure?
问题
如何在其自己的onAppear闭包中访问VStack？我尝试将堆栈作为ContentView的实例属性，但了解到VStack不是一种类型，而是一种类型构造器。我的选择有哪些，最佳实践是什么？
struct ContentView: View {
var body: some View {
VStack {
}
.background(.red)
.onAppear {
// 将VStack的背景颜色更改为蓝色
}
}
}
英文:
How do I access the VStack from within its own onAppear closure? I tried making the stack an instance property of ContentView but learned that VStack is not a type, but a type constructor. What are my options and what is best practice?
struct ContentView: View {
var body: some View {
VStack {
}
.background(.red)
.onAppear {
// change VStack background color to blue
}
}
}
答案1
得分: 1
你无法访问VStack的内部，但可以创建变量，VStack和onAppear都可以访问。
struct ContentView: View {
@State private var vStackBackground: Color = .red
var body: some View {
VStack {
Text("测试")
}
.background(vStackBackground)
.onAppear {
self.vStackBackground = .blue
}
}
}
英文:
You can't access the VStack internals but you can create a variables that both the VStack and the onAppear can access.
struct ContentView: View {
@State private var vStackBackground: Color = .red
var body: some View {
VStack {
Text("Test")
}
.background(vStackBackground)
.onAppear {
self.vStackBackground = .blue
}
}
}
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