[英]what is the best way to populate a picker view with JSON data in swift?
我正在 IOS 上构建 COVID-19 应用程序跟踪器。
为了按国家/地区显示数据,我构建了一个包含所有国家/地区名称的 pickerView。
感谢 HTTP cal,我设法获得了 JSON 数据,即每个国家/地区的名称。 理想情况下,我希望将每个值 append 到一个数组中,然后将填充pickerView。
那可能吗? 如果是,我会怎么做?
我也对其他方式持开放态度。 这是我的代码:
@IBOutlet weak var confirmedCasesLabel: UILabel!
@IBOutlet weak var deathsLabel: UILabel!
@IBOutlet weak var recoveriesLabel: UILabel!
//MARK: - Relevant variables
private let covidUrl: String = "https://corona-api.com/countries"
var countryArray: [String] = [String]()
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view.
countryPickerView.delegate = self
countryPickerView.dataSource = self
//
httpCall()
}
/*
// MARK: - Navigation
// In a storyboard-based application, you will often want to do a little preparation before navigation
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
// Get the new view controller using segue.destination.
// Pass the selected object to the new view controller.
}
*/
//MARK: - Functions that handles picker view delegates and data source
func numberOfComponents(in pickerView: UIPickerView) -> Int {
return 1
}
func pickerView(_ pickerView: UIPickerView, numberOfRowsInComponent component: Int) -> Int {
return countryArray.count
}
func pickerView(_ pickerView: UIPickerView, titleForRow row: Int, forComponent component: Int) -> String? {
return countryArray[row]
}
//MARK: - HTTP CALL - GET COUNTRY DATA
func httpCall() {
request(covidUrl, method: .get).responseJSON { (response) in
if response.result.isSuccess {
//test just print some data
let dataJSON: JSON = JSON(response.result.value)
//print(dataJSON)
//on va identifier chaque pays + l'ajouter au tableau des pays
// let countryNameJSON = dataJSON["data"][99]["name"]
// print(countryNameJSON)
for country in 0...99 {
let countryNameJSON = dataJSON["data"][country]["name"].stringValue
print(countryNameJSON)
//on ajoute ce nom au tabeleau de pays
//self.countryArray.append(countryNameJSON)
}
}
}
}
}
创建一个符合Decodable
协议的结构并添加所需的属性
struct Country: Decodable {
var name: String?
}
countryArray
的Country
object 类型数组countryArray
JSONDecoder
请按照下面的示例
class YourClass {
@IBOutlet weak var countryPickerView: UIPickerView!
var countryArray = [Country]()
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view.
countryPickerView.delegate = self
countryPickerView.dataSource = self
httpCall()
}
func pickerView(_ pickerView: UIPickerView, numberOfRowsInComponent component: Int) -> Int {
return countryArray.count
}
func pickerView(_ pickerView: UIPickerView, titleForRow row: Int, forComponent component: Int) -> String? {
return countryArray[row].name
}
//MARK: - HTTP CALL - GET COUNTRY DATA
func httpCall() {
request(covidUrl, method: .get).responseJSON { (response) in
if response.result.isSuccess {
let countryArray = try JSONDecoder().decode([Country].self, from: #yourJsonData#)
countryPickerView.reloadAllComponents()
}
}
}
}
由于Country
object 符合Decodable
协议,因此解析将在没有循环的情况下完成,因为Struct
与您的 JSON 模式匹配。
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