Swift 将图像从url下载到图像数组并显示在表视图中
从json url获取图像时遇到问题 这是我的json：Swift 将图像从url下载到图像数组并显示在表视图中,swift,uiimageview,Swift,Uiimageview,从json url获取图像时遇到问题 这是我的json： "bank_details": [ { "id": 1, "logo": "http://mortgagemarket.ae/webApi/public/mortgage_bank_icons/noorebank.png", "name": abc company } ] 我解析图像的swift代码如下： import UIKit class BanksViewContr
"bank_details": [
{
"id": 1,
"logo": "http://mortgagemarket.ae/webApi/public/mortgage_bank_icons/noorebank.png",
"name": abc company
}
]
import UIKit
class BanksViewController: UIViewController, UITableViewDelegate,UITableViewDataSource {
final let BANKS_URL = "http://www.mortgagemarket.ae/webApi/api/manage_interest_rates"
@IBOutlet weak var tableView: UITableView!
var bankicon = [String]()
var bankname = [String]()
var bankid = [Int]()
let stringid: String = ""
override func viewDidLoad() {
super.viewDidLoad()
self.displayFromDb()
tableView.dataSource = self
tableView.delegate = self
}
func displayFromDb()
{
let tokensp = UserDefaults.standard.string(forKey: "tokenKey")
let url = NSURL(string: BANKS_URL+"?token="+tokensp!)
print(url)
URLSession.shared.dataTask(with: (url as?URL)!, completionHandler: {(data,response,error) ->
Void in
if let jsonObj = try? JSONSerialization.jsonObject(with: data!, options: .allowFragments) as? NSDictionary
{
print(jsonObj.value(forKey: "bank_details")!)
if let messageArray = jsonObj.value(forKey: "bank_details") as? NSArray
{
print(jsonObj.value(forKey: "bank_details")!)
for message in messageArray
{
if let messageDict = message as? NSDictionary
{
if let data = data {
if let bankname = messageDict.value(forKey: "bank_name")
{
self.bankname.append(bankname as! String)
print(bankname)
}
if let banklogo = messageDict.value(forKey: "logo")
{
self.bankicon.append(banklogo as! String)
print(banklogo)
}
if let bankid = messageDict.value(forKey: "id")
{
self.bankid.append(bankid as! Int)
print(bankid)
}
OperationQueue.main.addOperation({
self.tableView.reloadData()
})
}
}
}
}
}
}).resume()
}
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return (bankname.count)
}
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier: "cell", for: indexPath) as! BanksTableViewCell
cell.bankicon.image = bankicon[indexPath.row] as? UIImage
cell.bankname.text = bankname[indexPath.row]
return (cell)
}
}
这是我将所有json数据放入表视图单元格的全部代码。请有人帮助我imageicon[indexPath.row]
提供一个url，而不是urlString图像
使用URLSession
从服务器获取图像，如
if let url = URL(string: imageicon[indexPath.row]) {
URLSession.shared.dataTask(with: url) { (data, response, error) in
if let data = data {
DispatchQueue.main.async {
cell.imageicon.image = UIImage(data: data)
}
}
}.resume()
}
您的模型应如下所示：
/// Your response models
struct BankDetails: Codable {
let bank_details: [ImageUrl]
}
struct ImageUrl: Codable {
let logo: String
}
func displayFromDb() {
let tokensp = UserDefaults.standard.string(forKey: "tokenKey")
let url = NSURL(string: BANKS_URL+"?token="+tokensp!)
if let myUrl = url {
URLSession.shared.dataTask(with: myUrl) { (data, response , error) in
guard let data = data else { return }
do {
let decoder = JSONDecoder()
let data = try decoder.decode(BankDetails.self, from: data)
print("my logo array is: \(data.bank_details)")
// TODO: - So you get urls
} catch let err {
print("Err", err)
}
}.resume()
}
}
然后在你的牢房里：
class MyCell: UITableViewCell {
/// create dataTask for cancel in prepareForReuse function
private var dataTask: URLSessionDataTask?
/// Like this
override public func prepareForReuse() {
super.prepareForReuse()
dataTask?.cancel()
}
func populate(with model: YourModel) {
/// You should set url in indexPath of your logo array([ImageUrl])
let url = model.url /// It's sample url for explain this is an url of your current index model
if let imageUrl = url {
downloaded(from: imageUrl)
}
}
func downloaded(from url: URL, contentMode mode: UIView.ContentMode = .scaleAspectFit) {
contentMode = mode
dataTask = URLSession.shared.dataTask(with: url) { data, response, error in
guard
let httpURLResponse = response as? HTTPURLResponse, httpURLResponse.statusCode == 200,
let mimeType = response?.mimeType, mimeType.hasPrefix("image"),
let data = data, error == nil,
let image = UIImage(data: data)
else { return }
DispatchQueue.main.async() {
self.yourImageView.image = image
}
}
dataTask?.resume()
}
}
在控制器的tableView cellForRowAt函数中：
let model = models[indexPath.row]
cell.populate(with: model)
return cell
您可以使用上述模型，并按如下方式创建displayFromDb：
/// Your response models
struct BankDetails: Codable {
let bank_details: [ImageUrl]
}
struct ImageUrl: Codable {
let logo: String
}
func displayFromDb() {
let tokensp = UserDefaults.standard.string(forKey: "tokenKey")
let url = NSURL(string: BANKS_URL+"?token="+tokensp!)
if let myUrl = url {
URLSession.shared.dataTask(with: myUrl) { (data, response , error) in
guard let data = data else { return }
do {
let decoder = JSONDecoder()
let data = try decoder.decode(BankDetails.self, from: data)
print("my logo array is: \(data.bank_details)")
// TODO: - So you get urls
} catch let err {
print("Err", err)
}
}.resume()
}
}
顺便说一句，您的JSON不是valid@Teetzjson有效json无效：Error:Parse Error在第1行：“bank_details”：[{“logo”：“http:--------------^应为'EOF'，'}'，，'，'，']“，Get'：”
ack，我希望STACKOVERFLOW更有帮助。这是一个很好的问题。这不是一个推荐的方法，因为这将使kepp在滚动时多次下载相同的图像，它肯定可以保存在缓存或模型中。这完全取决于OP是否愿意这样做。问题不是缓存图像下载的图像。这不显示图像：（检查是否有任何错误。检查您使用的URL是否有效。bank\u详细信息
和logo
不是imageURL
和URL
这将无法删除。它不起作用：（@johnDoe请分享您的最终代码，以便更好地理解。我们可以一起解决此问题：）您可以创建模型结构。请检查我对@johnDoe的编辑。如果您有任何问题，请立即提问。尽情享受。