【发布时间】：2020-12-05 21:38:58
【问题描述】：
我有一些使用 SwiftUI 的经验，并且我在前段时间编写了这段代码。我目前正在学习如何使用 Flutter 构建 UI。我将如何进行编码？它是一个可以通过滑动打开和关闭的浮动标签栏。
这基本上是一个圆角矩形 HStack，里面有 5 个按钮，如果它被滑动或长按，可以动画成一个按钮。几天前我刚刚开始使用 Flutter，但我仍在努力将我的 SwiftUI 逻辑转换为 Flutter。有什么想法吗？
struct TabBar: View {
@Binding var selected : Int
@State var expand = true
var drag: some Gesture {
DragGesture()
.onChanged {_ in self.expand = false}
}
var body: some View {
HStack {
Spacer(minLength:0)
HStack{
if !self.expand{
Button(action: {
self.expand.toggle()
}) {
Image("appleLogo")
.resizable()
.aspectRatio(contentMode: .fill)
.frame(width: 15, height: 15, alignment: .center)
.foregroundColor(.black)
.scaleEffect(2)
.padding()
}
}
else{
Button(action: {
self.selected = 0
}) {
ZStack {
Circle()
.frame(width: 40, height: 40)
.opacity(0)
Image(systemName: "house")
.foregroundColor(self.selected == 0 ? .black : Color("darkGray"))
.padding(.horizontal)
.scaleEffect(1.5)
}
}
Spacer(minLength:15)
Button(action: {
self.selected = 1
}) {
ZStack {
Circle()
.frame(width: 40, height: 40)
.opacity(0)
Image(systemName: "bubble.left")
.foregroundColor(self.selected == 1 ? .black : Color("darkGray"))
.padding(.horizontal)
.scaleEffect(1.5)
}
}
Spacer(minLength:15)
Button(action: {
self.selected = 2
}) {
ZStack {
Circle()
.frame(width: 40, height: 40)
.opacity(0)
Image(systemName: "plus.app")
.foregroundColor(self.selected == 2 ? .black : Color("darkGray"))
.padding(.horizontal)
.scaleEffect(1.5)
}
}
Spacer(minLength:15)
Button(action: {
self.selected = 3
}) {
ZStack {
Circle()
.frame(width: 40, height: 40)
.opacity(0)
Image(systemName: "cart")
.foregroundColor(self.selected == 3 ? .black : Color("darkGray"))
.padding(.horizontal)
.scaleEffect(1.5)
}
}
Spacer(minLength:15)
Button(action: {
self.selected = 4
}) {
ZStack {
Circle()
.frame(width: 40, height: 40)
.opacity(0)
Image(systemName: "person")
.foregroundColor(self.selected == 4 ? .black : Color("darkGray"))
.padding(.horizontal)
.scaleEffect(1.5)
}
}
}
}
.padding(.vertical,self.expand ? 8 : 6)
.padding(.horizontal,self.expand ? 20 : 6)
.background(VisualEffectView())
.background(Color("TabBarGray").opacity(0.3))
.opacity(self.expand ? 1.0 : 0.3)
.clipShape(Capsule())
.padding(30)
.onLongPressGesture {
self.expand.toggle()}
.gesture(drag)
.animation(.interactiveSpring(response:0.6, dampingFraction:0.6, blendDuration:0.6))
.frame(maxWidth: UIScreen.main.bounds.width,
maxHeight: UIScreen.main.bounds.height, alignment: .center)
}
}
}
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标签： swift flutter swiftui flutter-layout flutter-animation