Ich habe eine Situation, wo ich ein Formular ausfüllen und Bild aus der Bibliothek dann in einem Verzeichnis speichern. Ich kann Bild aus dem Verzeichnis aber tableview
Liste flackern in der Mitte der Bildlauf, so dass ich mit der Methode dispatch_async
arbeiten kann, aber nicht in der Lage zu tun.Schnelle asynch laden Bild aus dem Verzeichnis
Wenn jemand eine Lösung hat, lass es mich wissen.
Hier ist mein Code.
import UIKit
func getDocumentsURL() -> NSURL {
let documentsURL = NSFileManager.defaultManager().URLsForDirectory(.DocumentDirectory, inDomains: .UserDomainMask)[0]
return documentsURL
}
func fileInDocumentsDirectory(filename: String) -> String {
let fileURL = getDocumentsURL().URLByAppendingPathComponent(filename)
return fileURL.path!
}
class ViewController: UIViewController, UITableViewDelegate, UITableViewDataSource{
var marrEmpData : NSMutableArray!
@IBOutlet var MyTable: UITableView!
@IBAction func addEmpInfo(){
}
override func viewWillAppear(animated: Bool) {
self.getStudentData()
}
func getStudentData()
{
marrEmpData = NSMutableArray()
marrEmpData = ModelManager.getInstance().getAllStudentData()
MyTable.reloadData()
}
override func viewDidLoad() {
super.viewDidLoad()
MyTable.delegate = self
MyTable.dataSource = self
// Do any additional setup after loading the view, typically from a nib.
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int{
//return names.count;
return marrEmpData.count;
}
func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
let cell:CustomCell = self.MyTable.dequeueReusableCellWithIdentifier("cells") as! CustomCell
let emp:EmpInfo = marrEmpData.objectAtIndex(indexPath.row) as! EmpInfo
let randomNum = "Image-\(indexPath.row+1).png"
let imagePathOne = fileInDocumentsDirectory(randomNum)
dispatch_async(dispatch_get_main_queue()) {
if let loadedImage = self.loadImageFromPath(imagePathOne) {
print("view Loaded Image: \(loadedImage)")
cell.photo.image = loadedImage
}
else {
cell.photo.image = UIImage(named: "default_user")
}
}
// user profile
cell.name.text = emp.full_name
cell.age.text = emp.age
cell.phone.text = emp.phone
return cell
}
// which one is tapped
func tableView(tableView: UITableView, didSelectRowAtIndexPath indexPath: NSIndexPath) {
print("You tapped cell number \(indexPath.row).")
}
// load image of user
func loadImageFromPath(path: String) -> UIImage? {
print("image-----\(path)")
let image = UIImage(contentsOfFile: path)
if image == nil {
print("missing image at: \(path)")
}
print("Loading image from path: \(path)") // this is just for you to see the path in case you want to go to the directory, using Finder.
return image
}
}