I'm am using an NSTime to run a function every x amount of seconds as suggested here.
My issue is that I am getting this error message when ever the x amount of seconds is up and it is time to execute the function.
2015-04-06 11:55:51.898 myapp[21611:1186926] -[myapp.ViewController getJson(sharedData.jsonUrl)]: unrecognized selector sent to instance 0x7fff48761d60
2015-04-06 11:55:51.902 myapp[21611:1186926] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[myapp.ViewController getJson(sharedData.jsonUrl)]: unrecognized selector sent to instance 0x7fff48761d60'
*** First throw call stack:
(
0 CoreFoundation 0x0000000101497a75 __exceptionPreprocess + 165
1 libobjc.A.dylib 0x0000000102fefbb7 objc_exception_throw + 45
2 CoreFoundation 0x000000010149ed1d -[NSObject(NSObject) doesNotRecognizeSelector:] + 205
3 CoreFoundation 0x00000001013f69dc ___forwarding___ + 988
4 CoreFoundation 0x00000001013f6578 _CF_forwarding_prep_0 + 120
5 Foundation 0x00000001018cf844 __NSFireTimer + 83
6 CoreFoundation 0x00000001013ff6c4 __CFRUNLOOP_IS_CALLING_OUT_TO_A_TIMER_CALLBACK_FUNCTION__ + 20
7 CoreFoundation 0x00000001013ff285 __CFRunLoopDoTimer + 1045
8 CoreFoundation 0x00000001013c259d __CFRunLoopRun + 1901
9 CoreFoundation 0x00000001013c1bc6 CFRunLoopRunSpecific + 470
10 GraphicsServices 0x00000001055a0a58 GSEventRunModal + 161
11 UIKit 0x0000000101d2a580 UIApplicationMain + 1282
12 maybe 0x0000000100ed55ee top_level_code + 78
13 myapp 0x0000000100ed562a main + 42
14 libdyld.dylib 0x00000001037cb145 start + 1
)
libc++abi.dylib: terminating with uncaught exception of type NSException
(lldb)
I know that the function works as I have tested it on its own.
The code I am using to call the function with the NSTimer is:
override func viewDidLoad() {
super.viewDidLoad()
var timer = NSTimer.scheduledTimerWithTimeInterval(0.2, target: self, selector: "getJson(sharedData.jsonUrl)", userInfo: nil, repeats: true)
}
I'm not sure why i am getting this error. I have tried removing the argument from the call and the function itself so that it is exactly the same as the code from the question on SO that I learnt this from but I have had no luck.
I am writing this in swift.
Here is a little bit more info. getJson is just a function that downloads a JSON file and appends some of the values to an array. sharedData is a singleton class - I am using it to store values that are needed to be used in different view controllers. jsonUrl is one of the variable in that class. So sharedData.jsonUrl is just getting that variable out of the class.\
EDIT:
This is the code I am trying to use now: var timer = NSTimer.scheduledTimerWithTimeInterval( 0.2, target: self, selector: "getJson:", userInfo: nil, repeats: true)
The exact error message is:
2015-04-06 16:16:56.160 myapp[22712:1284267] -[myapp.settingsViewController getJson:]: unrecognized selector sent to instance 0x7f8c88c7d810
2015-04-06 16:16:56.165 myapp[22712:1284267] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[myapp.settingsViewController getJson:]: unrecognized selector sent to instance 0x7f8c88c7d810'
*** First throw call stack:
(
0 CoreFoundation 0x000000010a491a75 __exceptionPreprocess + 165
1 libobjc.A.dylib 0x000000010bfe9bb7 objc_exception_throw + 45
2 CoreFoundation 0x000000010a498d1d -[NSObject(NSObject) doesNotRecognizeSelector:] + 205
3 CoreFoundation 0x000000010a3f09dc ___forwarding___ + 988
4 CoreFoundation 0x000000010a3f0578 _CF_forwarding_prep_0 + 120
5 Foundation 0x000000010a8c9844 __NSFireTimer + 83
6 CoreFoundation 0x000000010a3f96c4 __CFRUNLOOP_IS_CALLING_OUT_TO_A_TIMER_CALLBACK_FUNCTION__ + 20
7 CoreFoundation 0x000000010a3f9285 __CFRunLoopDoTimer + 1045
8 CoreFoundation 0x000000010a3bc59d __CFRunLoopRun + 1901
9 CoreFoundation 0x000000010a3bbbc6 CFRunLoopRunSpecific + 470
10 GraphicsServices 0x000000010e59aa58 GSEventRunModal + 161
11 UIKit 0x000000010ad24580 UIApplicationMain + 1282
12 myapp 0x0000000109ed41ce top_level_code + 78
13 myapp 0x0000000109ed420a main + 42
14 libdyld.dylib 0x000000010c7c5145 start + 1
)
libc++abi.dylib: terminating with uncaught exception of type NSException
The get getJson function is:
func getJson() {
let urlPath = sharedData.jsonUrl.absoluteString
let url: NSURL = NSURL(string: urlPath!)!
let session = NSURLSession.sharedSession()
let task = session.dataTaskWithURL(url, completionHandler: {data, response, error -> Void in
if error != nil {
// If there is an error in the web request, print it to the console
println(error.localizedDescription)
}
var err: NSError?
var jsonResult = NSJSONSerialization.JSONObjectWithData(data, options: NSJSONReadingOptions.MutableContainers, error: &err) as NSDictionary
if err != nil {
// If there is an error parsing JSON, print it to the console
println("JSON Error \(err!.localizedDescription)")
}
let json = JSON(jsonResult)
var teamCount = json["teamCount"].string! // Number in array
var teamCountInt: Int = teamCount.toInt()! // Converts to integer
for index in 0...teamCountInt - 1 { // loop for number in array
let teamJson = json["teams"][index]["\(index)"].string! //
sharedData.teamsArray.append(teamJson) // Appends to array in shared data
}
println(sharedData.teamsArray) // For debug - delete after
})
task.resume()
}
This function is uses Swifty-json.
Change the method getJson() as follows:
class SomeGoodClassName {
func getJson(timer: NSTimer) {
//Directly use shareData.jsonUrl here to get json data
//... more code
}
}
NSTimer initialization
let jsonLoader = SomeGoodClassName()
override func viewDidLoad() {
super.viewDidLoad()
var timer = NSTimer.scheduledTimerWithTimeInterval(0.2, target: jsonLoader, selector: "getJson", userInfo: nil, repeats: true)
}