我正在尝试显示来自 API 的图像。这些图像位于 URL 内，我想用所有数组填充表视图，但它在表视图中只显示一张图像。
这是我的代码：
struct Autos {
let Marca:String
let Modelo:String
let Precio:String
let RutaImagen:String
init?(_ dict:[String:Any]?){
guard let _dict = dict,
let marca=_dict["Marca"]as?String,
let modelo=_dict["Modelo"]as?String,
let precio=_dict["Precio"]as?String,
let rutaImagen=_dict["RutaImagen"]as?String
else { return nil }
self.Marca = marca
self.Modelo = modelo
self.Precio = precio
self.RutaImagen = rutaImagen
}
}
var arrAutos = [Autos]()
func getImage(from string: String) -> UIImage? {
// Get valid URL
guard let url = URL(string: string)
else {
print("Unable to create URL")
return nil
}
var image: UIImage? = nil
do {
// Get valid data
let data = try Data(contentsOf: url, options: [])
// Make image
image = UIImage(data: data)
}
catch {
print(error.localizedDescription)
}
return image
}
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return 9
}
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier: "carsCell", for: indexPath) as! CarsDetailTableViewCell
let url = URL(string: "http://ws-smartit.divisionautomotriz.com/wsApiCasaTrust/api/autos")!
let task = URLSession.shared.dataTask(with: url) {
(data, response, error) in
guard let dataResponse = data, error == nil else {
print(error?.localizedDescription ?? "Response Error")
return
}
do {
let jsonResponse = try JSONSerialization.jsonObject(with: dataResponse, options: []) as? NSArray
self.arrAutos = jsonResponse!.compactMap({ Autos($0 as? [String:String])})
DispatchQueue.main.async {
// Get valid string
let string = self.arrAutos[indexPath.row].RutaImagen
if let image = self.getImage(from: string) {
// Apply image
cell.imgCar.image = image
}
cell.lblBrand.text = self.arrAutos[indexPath.row].Marca
cell.lblPrice.text = self.arrAutos[indexPath.row].Precio
cell.lblModel.text = self.arrAutos[indexPath.row].Modelo
}
} catch let parsingError {
print("Error", parsingError)
}
}
task.resume()
return cell
}
JSON序列化工作正常，因为其他数据在表视图中正确显示，问题出在图像上，因为在表视图中只出现一张图像，其他行为空。有人有建议吗？
我认为您应该在加载表视图之前下载完整数据并在完成处理程序中重新加载表视图。称呼loadData()方法在你的viewDidLoad().
fileprivate func loadData() {
let url = URL(string: "http://ws-smartit.divisionautomotriz.com/wsApiCasaTrust/api/autos")!
let task = URLSession.shared.dataTask(with: url) {
(data, response, error) in
guard let dataResponse = data, error == nil else {
print(error?.localizedDescription ?? "Response Error")
return
}
do {
let jsonResponse = try JSONSerialization.jsonObject(with: dataResponse, options: []) as? NSArray
self.arrAutos = jsonResponse!.compactMap({ Autos($0 as? [String:String])})
DispatchQueue.main.async {
self.tableView.reloadData()
}
} catch let parsingError {
print("Error", parsingError)
}
}
task.resume()
}
要在 tableView 单元格中加载图像，请下载图像background线程，然后更新 imageView 中main thread.
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier: "carsCell", for: indexPath) as! CarsDetailTableViewCell
// Get valid string
let string = self.arrAutos[indexPath.row].RutaImagen
//print(string)
cell.lblBrand.text = self.arrAutos[indexPath.row].Marca
cell.lblPrice.text = self.arrAutos[indexPath.row].Precio
cell.lblModel.text = self.arrAutos[indexPath.row].Modelo
let url = URL(string: string)
if url != nil {
DispatchQueue.global().async {
let data = try? Data(contentsOf: url!)
DispatchQueue.main.async {
if data != nil {
cell.imgCar.image = UIImage(data:data!)
}
}
}
}
return cell
}
希望这会起作用。
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