从列表中选择多个项目并在SwiftUI中更改其颜色

时间:2020-08-07 15:57:59

标签: ios arrays list text swiftui

我正在寻找一种解决此问题的方法。可能吗?

对于单个项目没有问题。所选项目将为白色,其余为我自己的颜色“ listTextColor”。但是,是否有可能以类似的方式将选择并保存在“ selectedItems”数组中的元素显示为白色,其余的显示为不同的颜色?

示例代码:

 @State var recordArray: Array = arrayRecords
 @State var selectedItems: Array = []
 @State var selections: String?

List() {
                            ForEach(self.recordArray, id: \.self) { record in
                                Text(record)
                                    .onTapGesture {
                                        self.selections = record
                                        self.selectedItems.append(record)
                                        
                                }
                                .foregroundColor(self.selections == record ? Color(.white) : Color(self.listTextColor2))
                            }
                        }

2 个答案:

答案 0 :(得分:0)

最好的选择是使用视图模型而不是纯字符串,并在其中使用标志为行着色。

struct ContentView: View {
    @State var recordArray: [RecordItem]
    
    var body: some View {
        List() {
            ForEach(0..<self.recordArray.count, id: \.self) { i in
                VStack {
                    Text(self.recordArray[i].title)
                }
                .border(Color.black)
                .onTapGesture {
                    self.recordArray[i].isSelected.toggle()
                    self.recordArray[i] = self.recordArray[i]
                }
                .foregroundColor(self.recordArray[i].isSelected ? Color(.red) : Color(.green))
            }
        }
    }
}


class RecordItem {
    var title = ""
    var isSelected = false
}

答案 1 :(得分:0)

我找到了这个问题的答案。

 @State var recordArray: Array = arrayRecords
 @State var selectedItems: Array = []
 @State var selections: String?

var body: some View {
List() {
                            ForEach(self.recordArray, id: \.self) { record in
                                Text(record)
                                    .onTapGesture {
                                                                                   if self.selectedItems.first(where: { $0 as! String == record } ) != nil {
                                            self.selectedItems.removeAll(where: { $0 as! String == record } )
                                        } else {
                                            self.selectedItems.append(record)
                                        }
                                        
                                }
                                .foregroundColor((self.selectedItems.first(where: { $0 as! String == record } ) != nil) ? Color(.white) : Color(self.listTextColor2))
                            }
                        }
}