swift - 你如何实现十进制键盘？

问题描述

在我的视图结构中注释掉了，我有一个键盘，我想在填写长/纬度文本字段时限制用户使用。还有其他线程接近这个问题，但我不明白他们在答案中引用了什么。
你如何限制用户使用小数点+标点符号键盘？
//
//  ContentView.swift
//  Geo Calculator App
//  App that calculates distance between two long/lat values
//
//  Created on 9/25/21.
//

import SwiftUI

struct ContentView: View {
    @State var longitude1 = ""
    @State var latitude1 = ""
    @State var longitude2 = ""
    @State var latitude2 = ""
    //self.LongLatTextField.keyboardType = UIKeyboardType.decimalPad
    var body: some View {
        VStack {

            Spacer()
            
            Text("Geo Calculator App")
                .font(.system(size: 24, weight: .bold))
                .foregroundColor(.black)
            
            Text("Calculate distances between long/lat values")
                .font(.system(size: 16, weight: .light))
                .foregroundColor(.gray)
            
            
            HStack {
            HStack {
                TextField("Longitude A", text: $longitude1)
                    .foregroundColor(.blue)
            }.frame(height: 60)
                .padding(.horizontal, 15)
                .background(Color.white)
                .cornerRadius(9)
            
            HStack {
                TextField("Latitude A", text: $latitude1)
                    .foregroundColor(.blue)
            }.frame(height: 60)
                .padding(.horizontal, 15)
                .background(Color.white)
                .cornerRadius(9)
            }.frame(height: 60)
                .padding(.horizontal, 15)
                .cornerRadius(9)
                .padding(.horizontal, 5)
            
            HStack {
            HStack {
                TextField("Longitude B", text: $longitude2)
                    .foregroundColor(.blue)
            }.frame(height: 60)
                .padding(.horizontal, 15)
                .background(Color.white)
                .cornerRadius(9)
            
            HStack {
                TextField("Latitude B", text: $latitude2)
                    .foregroundColor(.blue)
            }.frame(height: 60)
                .padding(.horizontal, 15)
                .background(Color.white)
                .cornerRadius(9)
            }.frame(height: 60)
                .padding(.horizontal, 15)
                .cornerRadius(9)
                .padding(.horizontal, 5)
            
            //Put label here to display output on button click

            Spacer()
            
            Button(action: {}) {
                Text("Calculate")
                    .foregroundColor(.white)
                    .font(.system(size: 24, weight: .medium))
            }.frame(maxWidth: .infinity)
                .padding(.vertical, 15)
                .background(Color.green.opacity(10))
                .cornerRadius(30)
                .padding(.horizontal, 70)
            
            Spacer()

            
        }.background(Color.white)
            .edgesIgnoringSafeArea(.all)
    }
}
//------------------------------------------------------
//Distance calculations, sources below
//geodatasource.com/developers/swift
//sisense.com/blog/latitude-longitude-distance-calculation-explained
func degreeToRadian(deg:Double) -> Double {
    return deg * Double.pi / 180
}

func radianToDegree(rad:Double) -> Double {
    return rad * 180 / Double.pi
}

func distance(lat1:Double, lon1:Double, lat2:Double, lon2:Double) -> Double {
    let theta = lon1 - lon2
    var dist = sin(degreeToRadian(deg: lat1)) * sin(degreeToRadian(deg: lat2)) + cos(degreeToRadian(deg: lat1)) * cos(degreeToRadian(deg: lat2)) * cos(degreeToRadian(deg: theta))
    dist = acos(dist)
    dist = radianToDegree(rad: dist)
    dist = dist * 60 * 1.1515 * 1.609344
    
    return dist
}
//------------------------------------------------------

struct ContentView_Previews: PreviewProvider {
    static var previews: some View {
        ContentView()
    }
}
标签： swiftswiftui
swift - 你如何实现十进制键盘？

问题描述

解决方案

推荐阅读
