Swiftui Multi Picker 以最小最大值更改选择

Posted 2023-02-24

【中文标题】Swiftui Multi Picker 以最小最大值更改选择

【英文标题】：Swiftui Multi Picker change selection with min max

【发布时间】：2020-07-16 17:31:59

【问题描述】：

您好，我有一个具有最小值和最大值的多重选择器，如果用户将最小值置于最大值之上，我想做出反应，我想将最小值的选择设置为最大值位置，这样用户就无法使用最小值超过最大值。但我不知道如何在会话期间更改选择器的选择。

 struct MultiPicker: View  

     typealias Label = String
     typealias Entry = String

     let data: [ (Label, [Entry]) ]
    @Binding var selection: [Entry]

     var body: some View 
         GeometryReader  geometry in
             HStack 
                 ForEach(0..<self.data.count)  column in
                     Picker(self.data[column].0, selection: self.$selection[column]) 
                         ForEach(0..<self.data[column].1.count)  row in
                             Text(verbatim: self.data[column].1[row])
                             .tag(self.data[column].1[row])
                         
                     
                     .pickerStyle(WheelPickerStyle())
                     .frame(width: geometry.size.width / CGFloat(self.data.count), height: geometry.size.height)
                     .clipped()
                 
             
         
     
 


 struct MultiPickerView: View 

     @State var data: [(String, [String])] = [
         ("Min", Array(1...30).map  "\($0)" ),
         ("Max", Array(2...60).map  "\($0)" )
     ]
    @State var selection: [String] = [3, 10].map  "\($0)" 
        

     var body: some View 
         VStack(alignment: .center) 
             Text(verbatim: "Selection: \(selection)")
                
                    
            HStack 
                Text(data[0].0)
                .frame(maxWidth: .infinity, alignment: .center)
                Text(data[1].0)
                .frame(maxWidth: .infinity, alignment: .center)
            
             MultiPicker(data: data, selection: $selection).frame(height: 300)
           
         
     

 

有人可以帮我吗？

【参考方案1】：

我已经解决了：

 MultiPicker(data: data, selection: $selection).frame(height: 300)
 .onReceive([self.selection].publisher.first())  _ in
                            self.correctMinMaxDays()
                        

private func correctMinMaxDays() 
        withAnimation 
            if Int(selection[0])! > Int(selection[1])! 
                selection[0] = selection[1]