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[英]How to fix TextField Binding <String> to show and edit in SwiftUI
[英]What textfield / view to show and edit text in SwiftUI?
我想编辑一个项目,例如,我有一个名为“夹克”的项目,然后我想用一个新名称“灰色夹克”进行编辑
现在我将拥有我的项目列表,当我按下“夹克”项目时,它将 go 到DetailItem
并且当它出现时,我希望该文本字段/视图已经填充了“夹克”文本然后我可以编辑它。 请注意,当项目名称首次出现时,我想使用真实文本而不是占位符。
有谁知道我应该使用什么元素,或者如果文本字段如何? 因为我在第一次出现时找不到如何设置带有名称的文本字段。
更新:
这是我尝试过的,我从这里获取的代码。 它基本上采用了以前的文本并将其作为占位符,而实际上我希望它是可编辑的。
struct CustomTextField: View {
var placeholder: Text
@Binding var text: String
var editingChanged: (Bool)->() = { _ in }
var commit: ()->() = { }
var body: some View {
ZStack(alignment: .leading) {
if text.isEmpty { placeholder }
TextField("", text: $text, onEditingChanged: editingChanged, onCommit: commit)
}
}
}
struct UsageCustomTxtField: View {
@State var text = ""
var body: some View {
CustomTextField(
placeholder: Text("placeholder").foregroundColor(.black),
text: $text
)
}
}
这是一个可能的解决方案:
import SwiftUI
struct ContentView: View {
@ObservedObject var myItems: ItemViewModel = ItemViewModel()
@State var myNewName: String = "" // Will set the new name
var body: some View {
VStack {
TextField(self.myItems.myList[0].name, // when it appears, I want that textfield / view already filled with "Jacket" text
text: self.$myNewName,
onCommit: {
self.myItems.changeNameOfListItemTo(newName: self.myNewName, index: 0) I would like to edit with a new name "Gray Jacket"
self.myNewName = "" //empty the textfield again so name from item itself will be displayed
})
}
}
}
struct Item { // I have an item named "Jacket"
var name: String
init(name: String) {
self.name = name
}
}
class ItemViewModel: ObservableObject {
@Published var myList: Array<Item> = [Item(name: "Jacket")] //your item list
func changeNameOfListItemTo(newName: String, index: Int) { //function to change the name of an item
self.myList[0].name = newName
}
}
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