I am trying to display some data I take from a data base into a TableView
but the data is not shown in the TableView
. The data I receive is formatted in JSON.
This is the data I receive form the data base and what I want to print in the TableView
is just David:
{"name":"David"}
This is the code to get the data from de data base:
let session = NSURLSession.sharedSession()
let request = NSURLRequest(URL: NSURL(string: "http://localhost:8888/Patients.php")!)
let task = session.dataTaskWithRequest(request) {data, response, downloadError in
if let error = downloadError {
print("Could not complete the request \(error)")
}
else {
do {
self.json = try NSJSONSerialization.JSONObjectWithData(data!, options: NSJSONReadingOptions.AllowFragments)
} catch {
fatalError()
}
dispatch_async(dispatch_get_main_queue(), {
if let parseJSON = self.json{
let name = parseJSON["name"] as! String
self.arrayData.append(name)
print("Data1:\(self.arrayData)")
}
})
}
}
task.resume()
arrayData is an array
where I put the data I receive from the data base and it is declared like this:
var arrayData: [String] = []
The code
print("Data1:\(self.arrayData)")
show in the console this Data1:["David"]
, so I get the data correctly.
Then I implement the methods to print in the ´TableView´, the numberOfSectionsInTableView
method, the numberOfRowsInSection
method and the cellForRowAtIndexPath
method but the data is not printed in the TableView
.
I think the problem is that the TableView
is drawn before I put the data in the array
so it prints nothing because the array is empty, and I don´t know how to fix it.
Anyone knows what is my problem?
yes, you're right.
session.dataTaskWithRequest
is async. Data is not returned immediately, it have delay. You must to reload tableview after recieved data:
self.arrayData.append(name)
self.tableview.reloadData()
Usually i will use block:
func getData(handleComplete:((arr:NSMutableArray)->())){
let aray = NSMutableArray()
let session = NSURLSession.sharedSession()
let request = NSURLRequest(URL: NSURL(string: "http://localhost:8888/Patients.php")!)
let task = session.dataTaskWithRequest(request) {data, response, downloadError in
if let error = downloadError {
print("Could not complete the request \(error)")
}
else {
do {
self.json = try NSJSONSerialization.JSONObjectWithData(data!, options: NSJSONReadingOptions.AllowFragments)
} catch {
fatalError()
}
dispatch_async(dispatch_get_main_queue(), {
if let parseJSON = self.json{
let name = parseJSON["name"] as! String
aray.append(name)
print("Data1:\(self.arrayData)")
}
handleComplete(aray)
})
}
}
task.resume()
arrayData
}
and in viewdidload i will call:
override func viewDidLoad() {
super.viewDidLoad()
self.getData { (arr) -> () in
self.tableview.reloadData()
}
}
it 's better
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