[英]SwiftUI listRowBackground can't animate?
我正在尝试模仿正常的 UITableView 行为,当您点击它时,它会停止,然后淡出。 我已经很接近了,除了:
.background()
不会填满整个列表单元格,它只是适合内容。.listRowBackground()
确实填充了单元格,但它没有动画。有没有办法为列表行背景设置动画?
以下是完整上下文的来源。 正如所写,因为listRowBackground
没有动画,所以您根本看不到背景变化。 如果您改为将其更改为background
,它会按预期进行动画处理,但不会填充单元格。
struct Profile {
let name: String
var selected: Bool
var hilited: Bool = false
}
extension Profile: Identifiable {
var id: String { name }
}
struct ProfilesPicker: View {
@State var profiles: [Profile]
var body: some View {
List {
ForEach(0..<profiles.count) { index in
let profile = profiles[index]
CheckCell(name: profile.name, checked: profile.selected)
// using .background() gets a proper fade but doesn't fill the cell
.listRowBackground(Color(profile.hilited ? UIColor.systemFill : UIColor.systemBackground))
.onTapGesture {
profiles[index].hilited = true
withAnimation(.easeIn) {
profiles[index].hilited = false
profiles[index].selected.toggle()
}
}
}
}
}
}
struct CheckCell: View {
let name: String
let checked: Bool
var body: some View {
HStack {
Text(name)
Spacer()
if checked {
Image(systemName: "checkmark")
}
}
.contentShape(Rectangle())
}
}
使用延迟并将 animation 添加到 listRowBackground。
struct ProfilesPicker: View {
@State var profiles: [Profile]
var body: some View {
List {
ForEach(0..<profiles.count) { index in
let profile = profiles[index]
CheckCell(name: profile.name, checked: profile.selected)
.onTapGesture {
profiles[index].hilited = true
DispatchQueue.main.asyncAfter(deadline: .now() + 0.1) { //<==Here
profiles[index].hilited = false
profiles[index].selected.toggle()
}
}
.animation(.default)
.listRowBackground(Color(profile.hilited ? UIColor.systemFill : UIColor.systemBackground).animation(.easeInOut)) //<==Here
}
}
}
}
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