iOS development Swift-10- location authorization, cocoapods, API, weather acquisition, city acquisition- Hefeng Weather App home page code

 1. Obtain the current location of the user

Click the plus sign in infi and select Permission: Obtain location permission when the user uses the app.

Fill in the purpose of using the location permission.

 2. Get the user's latitude and longitude.

ViewController:

import UIKit
import CoreLocation

class ViewController: UIViewController, CLLocationManagerDelegate {    //遵循CLLocationManagerDelegate协议
    //位置管理器
    let locationManager = CLLocationManager()

    override func viewDidLoad() {
        super.viewDidLoad()
        // Do any additional setup after loading the view.
        locationManager.requestWhenInUseAuthorization()    //请求当用户正在使用app的时候允许后台得到用户位置.只会弹出来一次
        locationManager.delegate = self    //位置管理器代理人是view controller对象.希望view controller能通过实现CLLocationManagerDelegate协议中的方法,获取到当前用户位置信息
        locationManager.desiredAccuracy = kCLLocationAccuracyThreeKilometers    //设置需要的位置精度(三公里误差精度)
        locationManager.requestLocation()    //请求用户位置
        
        
    }
    func locationManager(_ manager: CLLocationManager, didUpdateLocations locations: [CLLocation]) {  //requesLocation请求到了的话会执行这个方法
        let lon = locations[0].coordinate.longitude   //精度.因为location可能实时变化(地图app),所以是一个数组.我们只需要使用第一个获取到的位置.
        let lat = locations[0].coordinate.latitude    //纬度
        print(lon)
        print(lat)
    }
    func locationManager(_ manager: CLLocationManager, didFailWithError error: Error) {    //requesLocation请求失败的话会执行这个方法
        print(error)
    }


}

 3. Obtain the current weather through third-party services

(1) Install cocoapods

https://dev.qweather.com/

It can be found in the website, when a request is sent to https://devapi.qweather.com/v7/weather/now?[request parameter], the current weather can be obtained.

Dependency management through the dependency management tool cocoapods command line tool. Download and install it in the terminal,

Find the "Terminal" application on the Mac's launch pad, or use four-finger aggregation on the touchpad to open the "Start Pad-Terminal".

Enter at the command line

sudo gem install cocoapods

(As a super administrator, install the cocoapods application.)

Enter the computer power-on password.

 Wait for the installation to succeed.

 这里可能出现Error installing cocoapods:
The last version of activesupport (>= 5.0, < 8) to support your Ruby & RubyGems was 6.1.7.6. Try installing it with `gem install activesupport -v 6.1.7.6` and then running the current command again
activesupport requires Ruby version >= 2.7.0. The current ruby version is 2.6.10.210.

For this bug, please refer to the blog for the solution: https://www.cnblogs.com/lysboke/p/17678896.html

(2)安装功能包

在cocoapods官网https://cocoapods.org/的搜索栏搜索Alamofire.点击进入.

 用cocoapods安装Alamofire.

在终端中输入cd空格,将项目文件夹Weather拖入到cd后面.点击回车.

 终端输入

pod init

等待.完成之后打开Weather文件夹,发现成功创建Podfile文件.

 将Podfile拖入Xcode,Podfile自动弹出.

加入代码:

  pod 'Alamofire'

保存并关闭Podfile.

 在终端输入命令安装功能包:

pod install

 关闭Xcode,从Weather文件中打开Weather.xcworkspace,可以看到项目结构如下.

 4.利用和风API获取当前位置的天气信息

注册和风天气账号.在和风天气中创建一个免费的新项目.

https://console.qweather.com/#/apps/create-app/create

 得到key.

编写代码得到当前经纬度下的天气数据信息.

import UIKit
import CoreLocation
import Alamofire   //引入和风API包

class ViewController: UIViewController, CLLocationManagerDelegate {    //遵循CLLocationManagerDelegate协议
    //位置管理器
    let locationManager = CLLocationManager()

    override func viewDidLoad() {
        super.viewDidLoad()
        // Do any additional setup after loading the view.
        locationManager.requestWhenInUseAuthorization()    //请求当用户正在使用app的时候允许后台得到用户位置.只会弹出来一次
        locationManager.delegate = self    //位置管理器代理人是view controller对象.希望view controller能通过实现CLLocationManagerDelegate协议中的方法,获取到当前用户位置信息
        locationManager.desiredAccuracy = kCLLocationAccuracyThreeKilometers    //设置需要的位置精度(三公里误差精度)
        locationManager.requestLocation()    //请求用户位置
        
        
    }
    func locationManager(_ manager: CLLocationManager, didUpdateLocations locations: [CLLocation]) {  //requesLocation请求到了的话会执行这个方法
        let lon = locations[0].coordinate.longitude   //精度.因为location可能实时变化(地图app),所以是一个数组.我们只需要使用第一个获取到的位置.
        let lat = locations[0].coordinate.latitude    //纬度
        //print(lon)
        //print(lat)
        AF.request("https://devapi.qweather.com/v7/weather/now?location=\(lon),\(lat)&key=a91848aaab484a3599a703b139dfe87b").responseJSON { response in
            if let data = response.value{
                print(data)
            }
        }      //请求和风API的网址,得到当前位置的天气
    }
    func locationManager(_ manager: CLLocationManager, didFailWithError error: Error) {    //requesLocation请求失败的话会执行这个方法
        print(error)
    }
}

为了在测试中使用http传输,在Info中新增一个key和Value:App Transport Security Settings,在它里边再添加一个Allow Arbitrary Loads,Value设置为Yes.

 5.解析和风API返回的JSON数据

在Xcode中的Podfile中添加如下:

pod 'SwiftyJSON', '~> 4.0'

 保存之后在终端输入:

pod install

 下载之后引入JSON解析包,写入代码,测试.

import UIKit
import CoreLocation
import Alamofire   //引入和风API包
import SwiftyJSON   //引入解析JSON数据的包

class ViewController: UIViewController, CLLocationManagerDelegate {    //遵循CLLocationManagerDelegate协议
    //位置管理器
    let locationManager = CLLocationManager()

    override func viewDidLoad() {
        super.viewDidLoad()
        // Do any additional setup after loading the view.
        locationManager.requestWhenInUseAuthorization()    //请求当用户正在使用app的时候允许后台得到用户位置.只会弹出来一次
        locationManager.delegate = self    //位置管理器代理人是view controller对象.希望view controller能通过实现CLLocationManagerDelegate协议中的方法,获取到当前用户位置信息
        locationManager.desiredAccuracy = kCLLocationAccuracyThreeKilometers    //设置需要的位置精度(三公里误差精度)
        locationManager.requestLocation()    //请求用户位置
        
        
    }
    func locationManager(_ manager: CLLocationManager, didUpdateLocations locations: [CLLocation]) {  //requesLocation请求到了的话会执行这个方法
        let lon = locations[0].coordinate.longitude   //精度.因为location可能实时变化(地图app),所以是一个数组.我们只需要使用第一个获取到的位置.
        let lat = locations[0].coordinate.latitude    //纬度
        //print(lon)
        //print(lat)
        AF.request("https://devapi.qweather.com/v7/weather/now?location=\(lon),\(lat)&key=a91848aaab484a3599a703b139dfe87b").responseJSON { response in
            if let data = response.value{
                let weatherJSON = JSON(data)
                print(weatherJSON)
            }
        }      //请求和风API的网址,得到当前位置的天气
    }
    func locationManager(_ manager: CLLocationManager, didFailWithError error: Error) {    //requesLocation请求失败的话会执行这个方法
        print(error)
    }
}

 启动运行:

 6.拿到天气数据并展示在界面上

把温度拖拽到ViewController中.

 同理,将天气图标和用户当前所在的城市也拖拽到代码区.

 新建一个swift文件:

Weather.swift:

import Foundation

class Weather{
    var temp = ""
    var icon = ""
    var city = ""
}

ViewController:

import UIKit
import CoreLocation
import Alamofire   //引入和风API包
import SwiftyJSON   //引入解析JSON数据的包

class ViewController: UIViewController, CLLocationManagerDelegate {    //遵循CLLocationManagerDelegate协议
    @IBOutlet weak var tempLable: UILabel!
    
    @IBOutlet weak var iconImageView: UIImageView!
    
    @IBOutlet weak var cityLable: UILabel!
    
    //位置管理器
    let locationManager = CLLocationManager()
    //Weather.swift实例化
    let weather = Weather()

    override func viewDidLoad() {
        super.viewDidLoad()
        // Do any additional setup after loading the view.
        locationManager.requestWhenInUseAuthorization()    //请求当用户正在使用app的时候允许后台得到用户位置.只会弹出来一次
        locationManager.delegate = self    //位置管理器代理人是view controller对象.希望view controller能通过实现CLLocationManagerDelegate协议中的方法,获取到当前用户位置信息
        locationManager.desiredAccuracy = kCLLocationAccuracyThreeKilometers    //设置需要的位置精度(三公里误差精度)
        locationManager.requestLocation()    //请求用户位置
        
        
    }
    func locationManager(_ manager: CLLocationManager, didUpdateLocations locations: [CLLocation]) {  //requesLocation请求到了的话会执行这个方法
        let lon = locations[0].coordinate.longitude   //精度.因为location可能实时变化(地图app),所以是一个数组.我们只需要使用第一个获取到的位置.
        let lat = locations[0].coordinate.latitude    //纬度
        //print(lon)
        //print(lat)
        AF.request("https://devapi.qweather.com/v7/weather/now?location=\(lon),\(lat)&key=a91848aaab484a3599a703b139dfe87b").responseJSON { response in
            if let data = response.value{
                let weatherJSON = JSON(data)
                //print(weatherJSON["now"]["temp"])    //或weatherJSON["now", "temp"]
                //print(weatherJSON["refer"]["sources"][0])     //weatherJSON["refer", "sources", 0]
                
                //MVC结构
                self.weather.temp = "\(weatherJSON["now"]["temp"].stringValue)˚"
                self.weather.icon = weatherJSON["now"]["icon"].stringValue
                
                self.tempLable.text = self.weather.temp
                self.iconImageView.image = UIImage(named: self.weather.icon)
            }
        }      //请求和风API的网址,得到当前位置的天气
    }
    func locationManager(_ manager: CLLocationManager, didFailWithError error: Error) {    //requesLocation请求失败的话会执行这个方法
        print(error)
    }
}

 启动测试:

 7.获取用户当前所在的城市

ViewController:

import UIKit
import CoreLocation
import Alamofire   //引入和风API包
import SwiftyJSON   //引入解析JSON数据的包

class ViewController: UIViewController, CLLocationManagerDelegate {    //遵循CLLocationManagerDelegate协议
    @IBOutlet weak var tempLable: UILabel!
    
    @IBOutlet weak var iconImageView: UIImageView!
    
    @IBOutlet weak var cityLable: UILabel!
    
    //位置管理器
    let locationManager = CLLocationManager()
    //Weather.swift实例化
    let weather = Weather()

    override func viewDidLoad() {
        super.viewDidLoad()
        // Do any additional setup after loading the view.
        locationManager.requestWhenInUseAuthorization()    //请求当用户正在使用app的时候允许后台得到用户位置.只会弹出来一次
        locationManager.delegate = self    //位置管理器代理人是view controller对象.希望view controller能通过实现CLLocationManagerDelegate协议中的方法,获取到当前用户位置信息
        locationManager.desiredAccuracy = kCLLocationAccuracyThreeKilometers    //设置需要的位置精度(三公里误差精度)
        locationManager.requestLocation()    //请求用户位置
        
        
    }
    func locationManager(_ manager: CLLocationManager, didUpdateLocations locations: [CLLocation]) {  //requesLocation请求到了的话会执行这个方法
        let lon = locations[0].coordinate.longitude   //精度.因为location可能实时变化(地图app),所以是一个数组.我们只需要使用第一个获取到的位置.
        let lat = locations[0].coordinate.latitude    //纬度
        //print(lon)
        //print(lat)
        AF.request("https://devapi.qweather.com/v7/weather/now?location=\(lon),\(lat)&key=a91848aaab484a3599a703b139dfe87b").responseJSON { response in
            if let data = response.value{
                let weatherJSON = JSON(data)
                //print(weatherJSON["now"]["temp"])    //或weatherJSON["now", "temp"]
                //print(weatherJSON["refer"]["sources"][0])     //weatherJSON["refer", "sources", 0]
                
                //MVC结构
                self.weather.temp = "\(weatherJSON["now"]["temp"].stringValue)˚"
                self.weather.icon = weatherJSON["now"]["icon"].stringValue
                
                self.tempLable.text = self.weather.temp
                self.iconImageView.image = UIImage(named: self.weather.icon)
                
                
            }
        }      //请求和风API的网址,得到当前位置的天气
        
        AF.request("https://geoapi.qweather.com/v2/city/lookup?location=\(lon),\(lat)&key=a91848aaab484a3599a703b139dfe87b").responseJSON { response in
            if let data = response.value{
                let cityJSON = JSON(data)
                //处理数据
                self.weather.city = cityJSON["location", 0, "name"].stringValue
                //处理AI
                self.cityLable.text = self.weather.city
            }
        }
    }
    func locationManager(_ manager: CLLocationManager, didFailWithError error: Error) {    //requesLocation请求失败的话会执行这个方法

        cityLable.text = "获取用户城市失败"

    }


}

启动测试: