3_Fuzi_XML的解析

platform :ios, '13.0'
use_frameworks!

target 'DemoApp' do
    source 'https://github.com/CocoaPods/Specs.git'
    pod 'Fuzi'
end

• nutrition.xml 文件:

<?xml version="1.0"?>
<nutrition>
  <daily-values>
    <total-fat units="g">65</total-fat>
    <saturated-fat units="g">20</saturated-fat>
    <cholesterol units="mg">300</cholesterol>
    <sodium units="mg">2400</sodium>
    <carb units="g">300</carb>
    <fiber units="g">25</fiber>
    <protein units="g">50</protein>
  </daily-values>
  <food>
    <name>Avocado Dip</name>
    <mfr>Sunnydale</mfr>
    <serving units="g">29</serving>
    <calories total="110" fat="100"/>
    <total-fat>11</total-fat>
    <saturated-fat>3</saturated-fat>
    <cholesterol>5</cholesterol>
    <sodium>210</sodium>
    <carb>2</carb>
    <fiber>0</fiber>
    <protein>1</protein>
    <vitamins>
      <a>0</a>
      <c>0</c>
    </vitamins>
    <minerals>
      <ca>0</ca>
      <fe>0</fe>
    </minerals>
  </food>
  <food>
    <name>Bagels, New York Style </name>
    <mfr>Thompson</mfr>
    <serving units="g">104</serving>
    <calories total="300" fat="35"/>
    <total-fat>4</total-fat>
    <saturated-fat>1</saturated-fat>
    <cholesterol>0</cholesterol>
    <sodium>510</sodium>
    <carb>54</carb>
    <fiber>3</fiber>
    <protein>11</protein>
    <vitamins>
      <a>0</a>
      <c>0</c>
    </vitamins>
    <minerals>
      <ca>8</ca>
      <fe>20</fe>
    </minerals>
  </food>
  <food>
    <name>Beef Frankfurter, Quarter Pound </name>
    <mfr>Armitage</mfr>
    <serving units="g">115</serving>
    <calories total="370" fat="290"/>
    <total-fat>32</total-fat>
    <saturated-fat>15</saturated-fat>
    <cholesterol>65</cholesterol>
    <sodium>1100</sodium>
    <carb>8</carb>
    <fiber>0</fiber>
    <protein>13</protein>
    <vitamins>
      <a>0</a>
      <c>2</c>
    </vitamins>
    <minerals>
      <ca>1</ca>
      <fe>6</fe>
    </minerals>
  </food>
  <food>
    <name>Chicken Pot Pie</name>
    <mfr>Lakeson</mfr>
    <serving units="g">198</serving>
    <calories total="410" fat="200"/>
    <total-fat>22</total-fat>
    <saturated-fat>9</saturated-fat>
    <cholesterol>25</cholesterol>
    <sodium>810</sodium>
    <carb>42</carb>
    <fiber>2</fiber>
    <protein>10</protein>
    <vitamins>
      <a>20</a>
      <c>2</c>
    </vitamins>
    <minerals>
      <ca>2</ca>
      <fe>10</fe>
    </minerals>
  </food>
  <food>
    <name>Cole Slaw</name>
    <mfr>Fresh Quick</mfr>
    <serving units=" cup">1.5</serving>
    <calories total="20" fat="0"/>
    <total-fat>0</total-fat>
    <saturated-fat>0</saturated-fat>
    <cholesterol>0</cholesterol>
    <sodium>15</sodium>
    <carb>5</carb>
    <fiber>2</fiber>
    <protein>1</protein>
    <vitamins>
      <a>30</a>
      <c>45</c>
    </vitamins>
    <minerals>
      <ca>4</ca>
      <fe>2</fe>
    </minerals>
  </food>
  <food>
    <name>Eggs</name>
    <mfr>Goodpath</mfr>
    <serving units="g">50</serving>
    <calories total="70" fat="40"/>
    <total-fat>4.5</total-fat>
    <saturated-fat>1.5</saturated-fat>
    <cholesterol>215</cholesterol>
    <sodium>65</sodium>
    <carb>1</carb>
    <fiber>0</fiber>
    <protein>6</protein>
    <vitamins>
      <a>6</a>
      <c>0</c>
    </vitamins>
    <minerals>
      <ca>2</ca>
      <fe>4</fe>
    </minerals>
  </food>
  <food>
    <name>Hazelnut Spread</name>
    <mfr>Ferreira</mfr>
    <serving units="tbsp">2</serving>
    <calories total="200" fat="90"/>
    <total-fat>10</total-fat>
    <saturated-fat>2</saturated-fat>
    <cholesterol>0</cholesterol>
    <sodium>20</sodium>
    <carb>23</carb>
    <fiber>2</fiber>
    <protein>3</protein>
    <vitamins>
      <a>0</a>
      <c>0</c>
    </vitamins>
    <minerals>
      <ca>6</ca>
      <fe>4</fe>
    </minerals>
  </food>
  <food>
    <name>Potato Chips</name>
    <mfr>Lees</mfr>
    <serving units="g">28</serving>
    <calories total="150" fat="90"/>
    <total-fat>10</total-fat>
    <saturated-fat>3</saturated-fat>
    <cholesterol>0</cholesterol>
    <sodium>180</sodium>
    <carb>15</carb>
    <fiber>1</fiber>
    <protein>2</protein>
    <vitamins>
      <a>0</a>
      <c>10</c>
    </vitamins>
    <minerals>
      <ca>0</ca>
      <fe>0</fe>
    </minerals>
  </food>
  <food>
    <name>Soy Patties, Grilled</name>
    <mfr>Gardenproducts</mfr>
    <serving units="g">96</serving>
    <calories total="160" fat="45"/>
    <total-fat>5</total-fat>
    <saturated-fat>0</saturated-fat>
    <cholesterol>0</cholesterol>
    <sodium>420</sodium>
    <carb>10</carb>
    <fiber>4</fiber>
    <protein>9</protein>
    <vitamins>
      <a>0</a>
      <c>0</c>
    </vitamins>
    <minerals>
      <ca>0</ca>
      <fe>0</fe>
    </minerals>
  </food>
  <food>
    <name>Truffles, Dark Chocolate</name>
    <mfr>Lyndon's</mfr>
    <serving units="g">39</serving>
    <calories total="220" fat="170"/>
    <total-fat>19</total-fat>
    <saturated-fat>14</saturated-fat>
    <cholesterol>25</cholesterol>
    <sodium>10</sodium>
    <carb>16</carb>
    <fiber>1</fiber>
    <protein>1</protein>
    <vitamins>
      <a>0</a>
      <c>0</c>
    </vitamins>
    <minerals>
      <ca>0</ca>
      <fe>0</fe>
    </minerals>
  </food>
</nutrition>

import UIKit
import Fuzi
class ViewController: UIViewController {
    override func viewDidLoad() {
        super.viewDidLoad()
        yeTye()
    }
    
    func yeTye(){
        let fileUrl = URL(fileURLWithPath: ((#file as NSString).deletingLastPathComponent as NSString).appendingPathComponent("nutrition.xml"))
        do
        {
            // 加载文件:
            let data = try Data(contentsOf: fileUrl)
            let document = try XMLDocument(data: data)
            
            if let root = document.root
            {
                print("---Root Element: \(String(describing: root.tag))--") //Optional("nutrition")
                print("---Daily values:--\n")
                for element in root.firstChild(tag: "daily-values")?.children ?? []
                { // 遍历daily-values节点:
                    let nutrient = element.tag
                    let amount = element.numberValue
                    let unit = element["units"]
                    print("- \(amount!)\(unit!) \(nutrient!)")
//                    - 65g total-fat
//                    - 20g saturated-fat
//                    - 300mg cholesterol
//                    - 2400mg sodium
//                    - 300g carb
//                    - 25g fiber
//                    - 50g protein
                }
                
                var xpath = "//food/name"
                print("---按路径搜索(根节点下的所有/food/name节点)，Path Search: \(xpath)--") //XPath Search: //food/name
                for element in document.xpath(xpath)
                {
                    print("---\(element)--")
//                    <name>Avocado Dip</name>
//                    <name>Bagels, New York Style </name>
//                    <name>Beef Frankfurter, Quarter Pound </name>
//                    <name>Chicken Pot Pie</name>
//                    <name>Cole Slaw</name>
//                    <name>Eggs</name>
//                    <name>Hazelnut Spread</name>
//                    <name>Potato Chips</name>
//                    <name>Soy Patties, Grilled</name>
//                    <name>Truffles, Dark Chocolate</name>
                }
                
                let css = "food > serving[units]"
                var blockElement:XMLElement? = nil
                print("---CSS Search: \(css)--") // CSS Search: food > serving[units]
                
                for (index, element) in document.css(css).enumerated()
                { // 索引为1的节点:
                    if index == 1
                    {
                        blockElement = element
                        break
                    }
                }
                print("Second element: \(blockElement!)\n") //Second element: <serving units="g">104</serving>
                
                xpath = "//food/name"
                print("XPath Search: \(xpath)") //XPath Search: //food/name
                
                let firstElement = document.firstChild(xpath: xpath)!
                print("First element: \(firstElement)") // First element: <name>Avocado Dip</name>;
            }
        }
        catch
        {
            print("Something went wrong :(")
        }
    }
}