如何在子视图SwiftUI中使用BaseView@State属性
我有一个类似这样的BaseView,我想将警报机制添加到我的所有子视图中如何在子视图SwiftUI中使用BaseView@State属性,swift,swiftui,viewbuilder,Swift,Swiftui,Viewbuilder,我有一个类似这样的BaseView,我想将警报机制添加到我的所有子视图中 struct BaseView<Content: View>: View { @State var isAlertPresented = false let content: Content init(@ViewBuilder content: () -> Content) { self.content = content() }
struct BaseView<Content: View>: View {
@State var isAlertPresented = false
let content: Content
init(@ViewBuilder content: () -> Content) {
self.content = content()
}
var body : some View {
content.alert(isPresented: $isAlertPresented) {
Alert(title: Text("title"))
}
}
}
我可以这样做吗?如果是,我怎么做?如果视图包含BaseView,则它肯定不是与其相关的子视图。而且,您不应该访问/操纵其他视图的内部状态,因为这是一个违反真理的来源 相反,您必须在这种情况下使用绑定,如下所示(使用Xcode 11.7测试)
struct BaseView:View{
@绑定变量isAlertPresented:Bool
让内容:内容
init(isAlertPresented:Binding,@ViewBuilder内容:()->content){
self.\u isAlertPresented=isAlertPresented
self.content=content()
}
var body:一些观点{
content.alert(isPresented:$isAlertPresented){
警报(标题:文本(“标题”))
}
}
}
结构SomeOtherView:View{
@状态私有变量showAlert=false
var body:一些观点{
BaseView(isAlertPresented:$showAlert){
文本(“测试”)
}
.onReceive(vm.publisher){(输出)在
//.onAppear{//仅用于测试而不是上面的
self.showart=true
}
}
}
谢谢Asperi。这个解决方案对我来说还可以。但我还有30个其他视图。我是否必须为所有视图设置@Binding var isAlertPresented:Bool
属性?
struct SubView: View {
BaseView {
Text("")
}.onReceive(vm.publisher) { (output) in
// here I want to trigger BaseView isAlertPresented property
// BaseView.isAlertPresented = true
}
}
struct BaseView<Content: View>: View {
@Binding var isAlertPresented: Bool
let content: Content
init(isAlertPresented: Binding<Bool>, @ViewBuilder content: () -> Content) {
self._isAlertPresented = isAlertPresented
self.content = content()
}
var body : some View {
content.alert(isPresented: $isAlertPresented) {
Alert(title: Text("title"))
}
}
}
struct SomeOtherView: View {
@State private var showAlert = false
var body: some View {
BaseView(isAlertPresented: $showAlert) {
Text("Test")
}
.onReceive(vm.publisher) { (output) in
// .onAppear { // used instead of above just for test
self.showAlert = true
}
}
}