iOS开发Swift-11-正向传值,搜索,反向传值,城市id获取天气,光标聚焦,拦截空白/空格字符-和风天气App次页代码
1.创建次页的controller class
在Main中选择次界面,点击左上方黄色的圈圈,将它的Custom Class中的class修改为QueryViewController.
将QueryViewController中自动生成的首页传值方法复制到ViewController中去.去掉注释符号.
2.在Main中给1页向2页传值的箭头命名为QueryViewControllerSegue.
3.编码进行从首页到次页的城市正向传值.
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" } // Navigation跳转 // 跳转前到准备工作,从当前页面经过的所有跳转都会经过这个方法 override func prepare(for segue: UIStoryboardSegue, sender: Any?) { // 方法1. //if segue.identifier == "QueryViewControllerSegue"{ // let viewController = segue.destination as! QueryViewController // viewController.currentCity = weather.city //} // 方法2.
if let viewController = segue.destination as? QueryViewController{
ViewController.currentCity = weather.city
}
}
QueryViewController:
import UIKit class QueryViewController: UIViewController { var currentCity = "双流" @IBOutlet weak var currentCityLable: UILabel! override func viewDidLoad() { super.viewDidLoad() //从首页将城市名字传到次页(正向传值) currentCityLable.text = currentCity } }
4.启动测试,正向传值成功.
5.反向传值,将次页输入框中拿到的值传给首页的天气.制作返回按钮与搜索按钮.
QueryViewController:
import UIKit protocol QueryViewControllerDelegate { func didChangeCity(city: String) } class QueryViewController: UIViewController { var currentCity = "" var delegate: QueryViewControllerDelegate? @IBOutlet weak var currentCityLable: UILabel! @IBOutlet weak var cityTextfield: UITextField! override func viewDidLoad() { super.viewDidLoad() //从首页将城市名字传到次页(正向传值) currentCityLable.text = currentCity } //返回按钮 @IBAction func back(_ sender: Any) { dismiss(animated: true) } //查询按钮 @IBAction func query(_ sender: Any) { dismiss(animated: true) delegate?.didChangeCity(city: cityTextfield.text!) } }
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, QueryViewControllerDelegate { //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" } // Navigation跳转 // 跳转前到准备工作,从当前页面经过的所有跳转都会经过这个方法 override func prepare(for segue: UIStoryboardSegue, sender: Any?) { // if segue.identifier == "QueryViewControllerSegue"{ // let viewController = segue.destination as! QueryViewController // viewController.currentCity = weather.city // } if let viewController = segue.destination as? QueryViewController{ viewController.currentCity = weather.city viewController.delegate = self } } func didChangeCity(city: String) { print(city) } }
6.通过搜索获取用户想查询的城市名
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, QueryViewControllerDelegate { //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" } // Navigation跳转 // 跳转前到准备工作,从当前页面经过的所有跳转都会经过这个方法 override func prepare(for segue: UIStoryboardSegue, sender: Any?) { // if segue.identifier == "QueryViewControllerSegue"{ // let viewController = segue.destination as! QueryViewController // viewController.currentCity = weather.city // } if let viewController = segue.destination as? QueryViewController{ viewController.currentCity = weather.city viewController.delegate = self } } func didChangeCity(city: String) { //print(city) let parameters = ["location": city, "key": "a91848aaab484a3599a703b139dfe87b"] AF.request("https://geoapi.qweather.com/v2/city/lookup", parameters: parameters).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 } } } }
7.优化,直接通过城市id获取当时天气,避免受到重名城市困扰.
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, QueryViewControllerDelegate { //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" } // Navigation跳转 // 跳转前到准备工作,从当前页面经过的所有跳转都会经过这个方法 override func prepare(for segue: UIStoryboardSegue, sender: Any?) { // if segue.identifier == "QueryViewControllerSegue"{ // let viewController = segue.destination as! QueryViewController // viewController.currentCity = weather.city // } if let viewController = segue.destination as? QueryViewController{ viewController.currentCity = weather.city viewController.delegate = self } } func didChangeCity(city: String) { //print(city) let parameters = ["location": city, "key": "a91848aaab484a3599a703b139dfe87b"] AF.request("https://geoapi.qweather.com/v2/city/lookup", parameters: parameters).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
//通过城市id查询当前城市天气
let parameters = ["location": cityJSON["location", 0, "id"].stringValue, "key": "a91848aaab484a3599a703b139dfe87b"]
AF.request("https://devapi.qweather.com/v7/weather/now", parameters: parameters).responseJSON { response in
if let data = response.value{
let weatherJSON = JSON(data)
//处理数据
self.weather.temp = "\(weatherJSON["now","temp"].stringValue)°"
self.weather.icon = weatherJSON["now","icon"].stringValue
//处理UI
self.tempLable.text = self.weather.temp
self.iconImageView.image = UIImage(named: self.weather.icon)
}
}
}
}
}
}
8.优化,在次页直接将光标聚焦到搜索栏处,减少用户的点击操作.
QueryViewController:
import UIKit protocol QueryViewControllerDelegate { func didChangeCity(city: String) } class QueryViewController: UIViewController { var currentCity = "" var delegate: QueryViewControllerDelegate? @IBOutlet weak var currentCityLable: UILabel! @IBOutlet weak var cityTextfield: UITextField! override func viewDidLoad() { super.viewDidLoad() //将光标聚焦到搜索栏处 cityTextfield.becomeFirstResponder() //收起键盘:cityTextfield.resignFirstResponder() //从首页将城市名字传到次页(正向传值) currentCityLable.text = currentCity } //返回按钮 @IBAction func back(_ sender: Any) { dismiss(animated: true) } //查询按钮 @IBAction func query(_ sender: Any) { dismiss(animated: true) delegate?.didChangeCity(city: cityTextfield.text!) } }
9.拦截用户的空白搜索,减少资源消耗.
QueryViewController:
import UIKit protocol QueryViewControllerDelegate { func didChangeCity(city: String) } class QueryViewController: UIViewController { var currentCity = "" var delegate: QueryViewControllerDelegate? @IBOutlet weak var currentCityLable: UILabel! @IBOutlet weak var cityTextfield: UITextField! override func viewDidLoad() { super.viewDidLoad() //将光标聚焦到搜索栏处 cityTextfield.becomeFirstResponder() //收起键盘:cityTextfield.resignFirstResponder() //从首页将城市名字传到次页(正向传值) currentCityLable.text = currentCity } //返回按钮 @IBAction func back(_ sender: Any) { dismiss(animated: true) } //查询按钮 @IBAction func query(_ sender: Any) { dismiss(animated: true) if !cityTextfield.text!.trimmingCharacters(in: .whitespacesAndNewlines).isEmpty{//修剪掉用户输入的空格和回车,如果修剪掉之后字符串 不(!) 为空,则进行搜索 delegate?.didChangeCity(city: cityTextfield.text!) } } }
10.启动测试:
