I am trying to create a thread in swift and send two parameters. I create thread and this work:
let thread = NSThread(target:self, selector:"getData", object:nil)
thread.start()
But how to send parameters to my func getData? How to create object with parameters like this:
let params =...
let thread = NSThread(target:self, selector:"getData", object:params)
thread.start()
...
getData(username: String, password: String) {
...
}
Instead of using threads directly, you should be using Grand Central Dispatch. In this case you'd want to use dispatch_async
to call getData
on a background queue:
let username = ...
let password = ...
let queue = dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0)
dispatch_async(queue) {
getData(username, password);
}
Keep in mind that if getData
actually return
s data then you'll have to handle that inside dispatch_async
's closure:
let username = ...
let password = ...
let queue = dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0)
dispatch_async(queue) {
let someData = getData(username, password)
/* do something with someData */
}
/* !! someData is NOT available here !! */
I highly recommend taking a look at Apple's Concurrency Programming Guide if you're going to be doing multithreaded / concurrent programming on iOS.