如何解决SwiftUI 框架宽度问题
我正在创建一个可滚动的选择栏。我想要文本下方的选择指示器以匹配其上方文本矩形的宽度。所以在下图中,红色将适合黑色区域的整个宽度。
import SwiftUI
struct TabSelectionView: View {
let tabs: [String]
@State var selectedindex: Int
var tabHeight: CGFloat = 40
var tabHorizontalPadding: CGFloat = 8
var tabVerticalPadding: CGFloat = 16
var selectedTabColor = Color.primary
var selectedTextColor = Color.white
var unselectedTabColor = Color.gray
var unselectedTextColor = Color.black
var selectionBarColor = Color.red
var selectionBarHeight: CGFloat = 4
var body: some View {
ScrollView(.horizontal,showsIndicators: false) {
HStack(spacing: 0) {
ForEach(0..<tabs.count,id: \.self) { index in
tabView(for: index)
}
}
}
}
private func tabView(for index: Int) -> some View {
let isSelected = index == selectedindex
let tabColor = isSelected ? selectedTabColor : unselectedTabColor
let textColor = isSelected ? selectedTextColor : unselectedTextColor
let barColor = isSelected ? selectionBarColor : unselectedTabColor
return vstack(spacing: 0) {
Text(tabs[index])
.foregroundColor(textColor)
.padding(.horizontal,tabHorizontalPadding)
.padding(.vertical,tabVerticalPadding)
.background(tabColor)
.frame(height: tabHeight - selectionBarHeight)
if selectionBarHeight > 0 {
Rectangle()
.foregroundColor(barColor)
.frame(maxWidth: .infinity)
.frame(height: selectionBarHeight)
}
}
.contentShape(Rectangle())
.onTapGesture {
selectedindex = index
}
}
}
struct TabSelectionView_Previews: PreviewProvider {
static var previews: some View {
let tabs1 = ["All","Grouping 1","Grouping 2","Grouping 3","Sub Grouping 1","Grouping 4","Groupint 5","Sub Grouping 2"]
TabSelectionView(tabs: tabs1,selectedindex: .constant(0))
.previewLayout(PreviewLayout.sizeThatFits)
}
}
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