我有两个可以下载数据的URL，这些给了我这样的json：
1）http://192.168.178.77/MyWebService/api/getteams.php
R - >
{"teams":
[{"id":1,"name":"Avengers","member":7},{"id":2,"name":"Fantastics4","member":4},{"id":3,"name":"test","member":6},{"id":4,"name":"teamtest","member":33},{"id":5,"name":"inserisco","member":33},{"id":6,"name":"sarto","member":33},
{"id":7,"name":"name","member":22},
{"id":8,"name":"test","member":999}]
}
2）http://127.0.0.1/MyWebService/api/fetch_image.php?id_team=1 //其中id_team param是从第一个URL下载的id
R - > {"image_team":[{"id":4,"img_path":"http:\/\/localhost\/MyWebService\/images\/imgTest.png","id_team":1}]}
现在，为了下载这些数据，我在swift中创建了包含和下载数据的类和函数。
位于各自file.swift中的2个类是：
1）在TeamJson.swift中：
import Foundation
class ClassJsonTeam: Codable {
private var teams: [JsonTeam]
init(teams: [JsonTeam]) {
self.teams = teams
}
func getTeams()-> [JsonTeam]{
return(self.teams);
}
func setTeams(teams:[JsonTeam]){
self.teams = teams;
}
}
class JsonTeam: Codable {
private let id: Int
private var name: String
private var member: Int
init(id: Int, name: String, member: Int) {
self.id = id
self.name = name
self.member = member
}
func getId()->Int{
return(self.id);
}
func setId(id:Int){
self.member = id;
}
func getName()->String{
return(self.name);
}
func setName(name:String){
self.name = name;
}
func getMembers()->Int{
return(self.member);
}
func setMembers(members:Int){
self.member = members;
}
}
2）在ImageJsonTeam.swift中
import Foundation
class ClassJsonTeamImage : Codable {
private var teams : [JsonTeamImg]
init(teams: [JsonTeamImg]) {
self.teams = teams
}
func getTeamsImg()-> [JsonTeamImg]{
return(self.teams);
}
func setTeamsImg(teams:[JsonTeamImg]){
self.teams = teams;
}
}
class JsonTeamImg : Codable{
private var id : Int
private var imagePath: URL
private var teamId : Int
init(id : Int, imagePath : URL , teamId : Int) {
self.id = id
self.imagePath = imagePath
self.teamId = teamId
}
func getId() -> Int{
return(self.id)
}
func setId(id : Int){
self.id = id
}
func getImagePath() -> URL {
return(self.imagePath)
}
func setImagePath(imagePath : URL){
self.imagePath = imagePath
}
func getTeamId()-> Int{
return(self.teamId)
}
func setTeamId(teamId : Int){
self.teamId = teamId
}
}
此外，由于我需要合并来自两个jsons的信息，我创建了这种类型的第三类：
3）CompleteTeamJson.swift
import Foundation
public class ClassJsonCompleteTeam{
private var team : [JsonCompleteTeam]
init(team : [JsonCompleteTeam]){
self.team = team
}
}
public class JsonCompleteTeam{
private var id : Int
private var name : String
private var member : Int
private var imgUrl : URL
init(id: Int, name: String, member: Int, imgUrl: URL) {
self.id = id
self.name = name
self.member = member
self.imgUrl = imgUrl
}
func getId()->Int{
return(self.id);
}
func setId(id:Int){
self.member = id;
}
func getName()->String{
return(self.name);
}
func setName(name:String){
self.name = name;
}
func getMembers()->Int{
return(self.member);
}
func setMembers(members:Int){
self.member = members;
}
func getImageUrl() -> URL {
return(self.imgUrl)
}
func setImagePath(imgUrl : URL){
self.imgUrl = imgUrl
}
}
现在，我的viewController中的情况是这样的：
import UIKit
//var teamCollection : ClassJsonTeam!
//
class ViewController: UIViewController {
@IBAction func InsertNewTeamButton(_ sender: Any) {
performSegue(withIdentifier: "NewTeamSegue", sender: self)
}
var teams: [JsonTeam]?
var teamsImg : [JsonTeamImg]?
var teamsComplete : [JsonCompleteTeam]?
override func viewDidLoad() {
super.viewDidLoad()
downloadTeams(completion: { (teams) in
self.teams = teams
for index in (0...(self.teams!.count - 1)){
self.downloadTeamsImage(idTeam: teams[index].getId(), completion:
{(teamsImg) in self.teamsImg = teamsImg
})
let finalId : Int = teams[index].getId()
let finalName : String = teams[index].getName()
let finalMember : Int = teams[index].getMembers()
var finalURL : URL = URL(string : "http://localhost/MyWebService/images/EmptyImg.png")!
for index2 in (0...(self.teamsImg!.count - 1)){
if (finalId == self.teamsImg![index2].getId()){
finalURL = self.teamsImg![index2].getImagePath()
}
}
let tempCompleteTeam = JsonCompleteTeam(id: finalId, name: finalName, member: finalMember, imgUrl: finalURL)
self.teamsComplete?.append(tempCompleteTeam)
}
//self.InsertNewTeamButton((Any).self)
self.showTeamButton((Any).self)
})
}
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
// somethings in new wc //
}
@IBAction func showTeamButton(_ sender: Any) {
performSegue(withIdentifier: "TeamListSegue", sender: self)
}
func downloadTeams(completion: @escaping (([JsonTeam]) -> Void)) {
//get teams with classes
let getTeamUrl = "http://192.168.178.77/MyWebService/api/getteams.php"
guard let urlTeam = URL(string: getTeamUrl) else { return }
URLSession.shared.dataTask(with: urlTeam) { (data,response,err) in
guard let data = data else {return}
do {
let team = try JSONDecoder().decode(ClassJsonTeam.self, from: data)
var tempArrayTeam = [JsonTeam]()
for index in 0...(team.getTeams().count - 1) {
let tempTeam = JsonTeam(id: team.getTeams()[index].getId(),
name: team.getTeams()[index].getName(),
member: team.getTeams()[index].getMembers())
print(team.getTeams()[index].getId())
print(team.getTeams()[index].getName())
print(team.getTeams()[index].getMembers())
tempArrayTeam.append(tempTeam)
}
completion(tempArrayTeam)
} catch let jsonErr{
print("Error serializing json: \(jsonErr.localizedDescription)")
}
}.resume()
}
func downloadTeamsImage(idTeam: Int,completion: @escaping (([JsonTeamImg]) -> Void)) {
//get teams with classes
let getTeamUrl = "http://127.0.0.1/MyWebService/api/fetch_image.php?id_team=\(idTeam)"
guard let urlTeam = URL(string: getTeamUrl) else { return }
URLSession.shared.dataTask(with: urlTeam) { (data,response,err) in
guard let data = data else {return}
do {
let team = try JSONDecoder().decode(ClassJsonTeamImage.self, from: data)
var tempArrayTeamImg = [JsonTeamImg]()
for index in 0...(team.getTeamsImg().count - 1) {
let tempTeamImg = JsonTeamImg(id: team.getTeamsImg()[index].getId(),
imagePath: team.getTeamsImg()[index].getImagePath(),
teamId: team.getTeamsImg()[index].getTeamId())
print(tempTeamImg.getId())
print(tempTeamImg.getImagePath())
print(tempTeamImg.getTeamId())
tempArrayTeamImg.append(tempTeamImg)
}
completion(tempArrayTeamImg)
} catch let jsonErr{
print("Error serializing json: \(jsonErr.localizedDescription)")
}
}.resume()
}
}
让我们明白一点：如果我单独调用这两个函数，当然它们可以工作，但我不知道如何将下载的数据合并到do-catch之外（例如在两个变量团队和团队中）这样我们就可以贡献变量teamsComplete并在另一个视图控制器中传输数据。
提前致谢
更新你viewDidLoad
override func viewDidLoad() {
super.viewDidLoad()
downloadTeams(completion: { (teams) in
self.teams = teams
for index in (0...(self.teams!.count - 1)){
self.downloadTeamsImage(idTeam: teams[index].getId(), completion:
{(teamsImg) in self.teamsImg = teamsImg
let finalId : Int = teams[index].getId()
let finalName : String = teams[index].getName()
let finalMember : Int = teams[index].getMembers()
var finalURL : URL = URL(string : "http://localhost/MyWebService/images/EmptyImg.png")!
for index2 in (0...(self.teamsImg!.count - 1)){
if (finalId == self.teamsImg![index2].getId()){
finalURL = self.teamsImg![index2].getImagePath()
}
}
let tempCompleteTeam = JsonCompleteTeam(id: finalId, name: finalName, member: finalMember, imgUrl: finalURL)
self.teamsComplete?.append(tempCompleteTeam)
// YOU CAN MOVE FORWARD NOW AS ALL THE DATA IS LOADED
if index == self.teams!.count - 1 {
self.showTeamButton((Any).self)
}
}
})
})
}
这将删除您的崩溃，并在加载所有数据时调用showTeamButton。