对于大字体，a 中的线条Picker是重叠的。我该如何更改Picker's行高？ （提示：.lineSpacing修饰符不会这样做。）

See Also

这个问题类似于Ejaaz，但他的问题至今尚未得到答复。

问题

The Code

以下可运行代码产生上述结果。我并不是真的想要不同大小的线条，我只是想要大字体能够正确适应。我试过插入Spacers，添加.frame这里和那里的修饰符，.lineSpacing, padding()...也许只是还没有找到正确的组合？

struct ContentView: View {
    @State private var selected = 0

    var body: some View {
        Picker(selection: self.$selected, label: Text("Letters")) {
            Text("A").font(.system(size: 30))
            Text("B").font(.system(size: 40))
            Text("C").font(.system(size: 50))
            Text("D").font(.system(size: 60))
            Text("E").font(.system(size: 70))
            Text("F").font(.system(size: 80))
        }
    }
}

你必须包裹UIPickerView in a UIViewRepresentable然后使用：

 func pickerView(_ pickerView: UIPickerView, rowHeightForComponent component: Int) -> CGFloat 

...更改行高。

Example

它只是展示了如何更改行高，您仍然需要为您的内容扩展它......

struct PickerView: UIViewRepresentable {
    var data: [[String]]
    @Binding var selections: Int

    // Assign custom coordinator for delegate functions.
    func makeCoordinator() -> PickerView.Coordinator {
        Coordinator(self)
    }

    // Creates the view object and configures its initial state.
    func makeUIView(context: UIViewRepresentableContext<PickerView>) -> UIPickerView {
        let picker = UIPickerView(frame: .zero)

        picker.dataSource = context.coordinator
        picker.delegate = context.coordinator

        return picker
    }

    // Updates the state of the specified view with new information from SwiftUI.
    func updateUIView(_ view: UIPickerView, context: UIViewRepresentableContext<PickerView>) {
        // for i in 0...(self.selections.count - 1) {
        //     view.selectRow(self.selections[i], inComponent: i, animated: false)
        // }
    }


    // Coordinator acting as the delegate in SwiftUI.
    class Coordinator: NSObject, UIPickerViewDataSource, UIPickerViewDelegate {
        var parent: PickerView

        //init(_:)
        init(_ pickerView: PickerView) {
            self.parent = pickerView
        }
        
        // Set your custom row height here!
        func pickerView(_ pickerView: UIPickerView, rowHeightForComponent component: Int) -> CGFloat {
            return 80
        }

        //numberOfComponents(in:)
        func numberOfComponents(in pickerView: UIPickerView) -> Int {
            return self.parent.data.count
        }

        //pickerView(_:numberOfRowsInComponent:)
        func pickerView(_ pickerView: UIPickerView, numberOfRowsInComponent component: Int) -> Int {
            return self.parent.data[component].count
        }

        //pickerView(_:titleForRow:forComponent:)
        func pickerView(_ pickerView: UIPickerView, titleForRow row: Int, forComponent component: Int) -> String? {
            return self.parent.data[component][row]
        }

        //pickerView(_:didSelectRow:inComponent:)
        func pickerView(_ pickerView: UIPickerView, didSelectRow row: Int, inComponent component: Int) {
            // self.parent.selections[component] = row
        }
    }
}

要在 SwiftUI 视图中使用它，只需将自定义PickerView()在你的身体里。