我已经解析了一个json字符串,我想在tableview中使用它。当我尝试将json字符串附加到数组中时,append方法无法正常工作。这是我用过的代码。任何人都可以帮我这个吗?
import UIKit
class ViewController: UIViewController, UITableViewDataSource, UITableViewDelegate {
@IBOutlet weak var tableView: UITableView!
var userName = [String]()
override func viewDidLoad() {
super.viewDidLoad()
tableView.delegate = self
tableView.dataSource = self
// 1
let urlAsString = "http://demo.codeofaninja.com/tutorials/json-example-with-php/index.php"
let url = NSURL(string: urlAsString)!
let urlSession = NSURLSession.sharedSession()
//2
let jsonQuery = urlSession.dataTaskWithURL(url, completionHandler: { data, response, error -> Void in
if (error != nil) {
print(error!.localizedDescription)
}
// 3
do {
let jsonResult = try NSJSONSerialization.JSONObjectWithData(data!, options: NSJSONReadingOptions.MutableContainers) as! NSDictionary
/*let err: NSError!
if (err != nil) {
print("JSON Error \(err.localizedDescription)")
}*/
// 4
//let fname: String! = jsonResult["firstname"] as! String
//let lname: String! = jsonResult["lastname"] as! String
//let usrname: String! = jsonResult["username"] as! String
dispatch_async(dispatch_get_main_queue(), {
if let users = jsonResult.objectForKey("Users") as? [[String:AnyObject]]
{
for user in users
{
print("First Name:")
print(user["firstname"]!)
print("Last Name:")
print(user["lastname"]!)
print("User Name:")
let nameUser = user["username"]! as! String
print(nameUser)
self.userName.append(nameUser)
print("***************")
}
}
//print(jsonResult["Users"]!)
//print(lname)
//print(usrname)
})
}
catch {
print("error");
}
})
jsonQuery.resume()
//self.userName.append("ganesh")
// 5
print(userName)
}
func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return userName.count
}
func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCellWithIdentifier("cell") as UITableViewCell!
cell.textLabel?.text = userName[indexPath.row]
return cell
}
func tableView(tableView: UITableView, commitEditingStyle editingStyle: UITableViewCellEditingStyle, forRowAtIndexPath indexPath: NSIndexPath) {
userName.removeAtIndex(indexPath.row)
tableView.deleteRowsAtIndexPaths([indexPath], withRowAnimation: .Automatic)
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
}
答案 0 :(得分:2)
您正在数组中追加,只需在调度结束时调用self.tableView.reloadData()
刷新表视图,以便在tableView中显示数据。
答案 1 :(得分:1)
append函数工作正常,但是你在后台填充数组,并且在数组中有数据时从不重新加载tableView
for user in users
{
if let nameUser = user["username"] as? String {
self.userName.append(nameUser)
}
}
self.tableView.reloadData()
在if let users = jsonResult.objectForKey("Users") as? [[String:AnyObject]]
块