In Swift how to call method with parameters on GCD main thread?

Reload collectionView on Main Thread

DispatchQueue.main.async {
    self.collectionView.reloadData()
}

Swift 3+ & Swift 4 version:

DispatchQueue.main.async {
    print("Hello")
}

Swift 3 and Xcode 9.2:

dispatch_async_on_main_queue {
    print("Hello")
}

Modern versions of Swift use DispatchQueue.main.async to dispatch to the main thread:

DispatchQueue.main.async { 
  // your code here
}

To dispatch after on the main queue, use:

DispatchQueue.main.asyncAfter(deadline: .now() + 0.1) {
  // your code here
}

Older versions of Swift used:

dispatch_async(dispatch_get_main_queue(), {
  let delegateObj = UIApplication.sharedApplication().delegate as YourAppDelegateClass
  delegateObj.addUIImage("yourstring")
})

Swift 2

Using Trailing Closures this becomes:

dispatch_async(dispatch_get_main_queue()) {
    self.tableView.reloadData()
}

Trailing Closures is Swift syntactic sugar that enables defining the closure outside of the function parameter scope. For more information see Trailing Closures in Swift 2.2 Programming Language Guide.

In dispatch_async case the API is func dispatch_async(queue: dispatch_queue_t, _ block: dispatch_block_t) since dispatch_block_t is type alias for () -> Void - A closure that receives 0 parameters and does not have a return value, and block being the last parameter of the function we can define the closure in the outer scope of dispatch_async.