在下面的代码中,我有一个有4个按钮的设置,每次我按下一个按钮,它就像一个开关(就像一个单选按钮)。我想要实现的是,当按下其中一个按钮时,所有其他按钮都变成灰色。一次只能有一个按钮为绿色或处于活动状态。
struct hzButton: View {
var text: String
@State var didTap: Bool
var body: some View {
Button(action: {
if self.didTap == true{
self.didTap = false
}else{
self.didTap = true
}
selectFreq(frequency: self.text)
}) {
Text(text)
.font(.body)
.fontWeight(.semibold)
.foregroundColor(Color.white)
.multilineTextAlignment(.center)
.padding(.all)
.background(didTap ? Color.green : Color.gray)
.cornerRadius(6.0)
}
.frame(width: nil)
}
}
struct Row: Identifiable {
let id = UUID()
let headline: String
let numbers: [String]
}
struct ContentView: View {
var rows = [
Row(headline: "", numbers: ["250","500","750","1000"]),
]
var body: some View {
HStack {
ForEach(rows) { row in
HStack {
ForEach(row.numbers, id: \.self) { text in
hzButton(text: text, didTap: false)
}
}
}
}
}
}
发布于 2019-11-08 00:56:21
在SwiftUI中,一切都是由状态更改触发的。要实现单选按钮样式更改,您需要执行以下操作:
struct MyRadioButton: View {
let id: Int
@Binding var currentlySelectedId: Int
var body: some View {
Button(action: { self.currentlySelectedId = self.id }, label: { Text("Tap Me!") })
.foregroundColor(id == currentlySelectedId ? .green : .red)
}
}
struct MyRadioButtons: View {
@State var currentlySelectedId: Int = 0
var body: some View {
VStack {
MyRadioButton(id: 1, currentlySelectedId: $currentlySelectedId)
MyRadioButton(id: 2, currentlySelectedId: $currentlySelectedId)
MyRadioButton(id: 3, currentlySelectedId: $currentlySelectedId)
MyRadioButton(id: 4, currentlySelectedId: $currentlySelectedId)
}
}
}
当共享currentlySelectedId更改时,依赖于该状态的所有按钮都将相应更新。
发布于 2019-11-08 00:51:10
不要把它想象成4个单独的按钮,每个按钮都有自己的开/关状态,而是将组作为一个整体来考虑,以及它们如何表示单个当前值状态。然后,当每个按钮确定其背景颜色时,它可以考虑“我的值是否与当前选择的值匹配?”因此,不是在点击按钮时切换布尔值,而是让按钮使用自己的值更新当前选定的值(在组中的所有按钮之间共享)。
https://stackoverflow.com/questions/58752639
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