问题描述
你好,我在这里遇到问题,在ios13或ios14上运行时,我的.sheet()视图之间没有一致的行为
Hello I am running into a problem here and I do not have a consistent behavior between my .sheet() view when running on ios13 or ios14
我有这样的看法:
@State private var label: String = ""
@State private var sheetDisplayed = false
///Some code
var body: some View {
VStack {
Button(action: {
self.label = "A label"
self.isDisplayed = true
}) {
Text("test")
}
}.sheet(isPresented: $sheetDisplayed, onDismiss: {
self.label = ""
}) {
Text(self.label)
}
}
在ios 13上,此工作如预期的btn一样,单击->设置标签->电话单->显示标签"在文本"视图中.
On ios 13 this work as expected btn click -> set label -> call sheet -> display "A label" in a Text view.
在ios14上,我在工作表关闭时在self.label中有一个空字符串,因此它不显示任何内容.
On ios14 I got an empty string in self.label when in sheet closure, hence it does not display anything.
我错过了什么吗?是iOS 14的错误,还是我在ios13上出错了,并且已得到纠正.
Did I missed something ? Is it an iOS 14 bug or did I had it wrong on ios13 and that got corrected.
PS:我还简化了闭包中传递的其他几个变量.
PS: I have a couple of other variables that are passed in the closure I simplified it.
推荐答案
您的代码具有视图更新/创建顺序的期望,但总的来说它是未定义的(可能在iOS 14中已更改).
Your code have expectation of view update/creation order, but in general it is undefined (and probably changed in iOS 14).
有一种明确的方式可以在工作表内部传递信息-使用不同的工作表创建者,即.sheet(item:...
There is explicit way to pass information inside sheet - use different sheet creator, ie. .sheet(item:...
这是工作可靠的例子.经过Xcode 12/iOS 14的测试
Here is working reliable example. Tested with Xcode 12 / iOS 14
struct ContentView: View {
@State private var item: Item?
struct Item: Identifiable {
let id = UUID()
var label: String = ""
}
var body: some View {
VStack {
Button(action: {
self.item = Item(label: "A label")
}) {
Text("test")
}
}.sheet(item: $item, onDismiss: {
self.item = nil
}) {
Text($0.label)
}
}
}
这篇关于SwiftUI @State和.sheet()iOS13与iOS14的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持!