[英]UITableIViewCell image downloading from URL
我正在使用alamofire從URL下載圖像。 我正在獲取onclick的圖片,但顯示視圖時卻沒有。
出現視圖時如何獲取所有圖像? 這是我用來實現的代碼:
import UIKit
import Alamofire
import SwiftyJSON
import SDWebImage
import Kingfisher
class Paragogoi: UITableViewController {
var data=[FronItem]()
override func viewDidLoad() {
super.viewDidLoad()
Alamofire.request(.GET, "http://gaiaskarpos.com/getCategores.php").validate().responseJSON { response in
switch response.result {
case .Success:
if let value = response.result.value
{
let json = JSON(value)
let list: Array<JSON> = json.arrayValue
var urls=[String]()
for element in list{
let id:String=element["id"].stringValue
let name:String=element["name"].stringValue
let url:String=element["url"].stringValue
self.data.append(FronItem(id:id,name:name,url:url))
};
self.tableView.reloadData()
}
case .Failure(let error):
print(error)
}
}
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
override func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return data.count
}
override func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCellWithIdentifier("paragogosCell", forIndexPath: indexPath)
cell.textLabel?.text = data[indexPath.row].name
asycloadp(data[indexPath.row].url!, imageView: cell.imageView!)
return cell
}
func asycloadp(url:String,imageView:UIImageView){
let downloadQueue=dispatch_queue_create("myqueue", nil)
print(url)
dispatch_async(downloadQueue){
let imageUrl:NSURL?
= NSURL(string:url)
dispatch_async(dispatch_get_main_queue()){
imageView.sd_setImageWithURL(imageUrl)
}
}
}
}
除“ This”之外,我是否應該添加其他內容?
從服務器獲取所有數據后,只需在主線程中重新加載tableView
即可。
dispatch_async(dispatch_get_main_queue()) {
self.tableView.reloadData()
}
由於dispatch_async是異步傳輸,因此您必須在下載映像后刷新表視圖,但是我看到您正在使用SDWebImage,因此不需要功能asycloadp,更改代碼並重試。
import UIKit
import Alamofire
import SwiftyJSON
import SDWebImage
import Kingfisher
class Paragogoi: UITableViewController {
var data=[FronItem]()
override func viewDidLoad() {
super.viewDidLoad()
Alamofire.request(.GET, "http://gaiaskarpos.com/getCategores.php").validate().responseJSON { response in
switch response.result {
case .Success:
if let value = response.result.value {
let json = JSON(value)
let list: Array<JSON> = json.arrayValue
var urls=[String]()
for element in list{
let id:String=element["id"].stringValue
let name:String=element["name"].stringValue
let url:String=element["url"].stringValue
self.data.append(FronItem(id:id,name:name,url:url))
};
self.tableView.reloadData()
}
case .Failure(let error):
print(error)
}
}
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
override func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return data.count
}
override func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCellWithIdentifier("paragogosCell", forIndexPath: indexPath)
cell.textLabel?.text = data[indexPath.row].name
let imageUrl:NSURL? = NSURL(string:url)
cell.imageView!.sd_setImageWithURL(imageUrl, completed:{(image: UIImage?, error: NSError?, cacheType: SDImageCacheType!, imageURL: NSURL?) in
if (image != nil) {
tableView.reloadRowsAtIndexPaths([indexPath], withRowAnimation: .None)
}
})
return cell
}
}
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