Programmatically Setting Root View Controller in Swift - ios

Question

I'm not sure why this is so trivial, but my Swift translation has been a slow one. Anyways, I can't figure out what it is complaining about. All I am trying to do is set the root view controller, and the compiler spits an error saying:
"Splash pageController does not have a member named init"
Here's my app delegate:
var window: UIWindow?
var CLIENT_KEY = c_key()
func application(application: UIApplication, didFinishLaunchingWithOptions launchOptions: [NSObject: AnyObject]?) -> Bool {
// Override point for customization after application launch.
window = UIWindow(frame: UIScreen.mainScreen().bounds)
var url_string = "XXXX=\(CLIENT_KEY.client_key)"
var g_home_url = String.stringWithContentsOfURL(NSURL.URLWithString(url_string), encoding: NSUTF8StringEncoding, error: nil)
if (g_home_url? != nil){
NSUserDefaults.standardUserDefaults().setObject(g_home_url, forKey: "showUrl")
}
let DocumentsDirectory = NSSearchPathDirectory.DocumentationDirectory
let UserDomainMask = NSSearchPathDomainMask.UserDomainMask
if let paths = NSSearchPathForDirectoriesInDomains(DocumentsDirectory, UserDomainMask, true){
if paths.count > 0{
if let dirPath = paths[0] as? String {
// let url: NSURL = NSURL.URLWithString("\(g_home_url)/XXX\(CLIENT_KEY.client_key)")
// println(url)
var err: NSError?
var g_home_url = NSUserDefaults.standardUserDefaults().objectForKey("showUrl") as String
println(g_home_url)
var image = UIImage(data: NSData(contentsOfURL: NSURL.URLWithString("\(g_home_url)XXX=\(CLIENT_KEY.client_key)")))
let writePath = dirPath.stringByAppendingPathComponent("splash_page.png")
UIImagePNGRepresentation(image)
}
}
}
//This is where the error shows up
var rootview: SplashViewController = SplashViewController()
if let window = window {
window.rootViewController = rootview;
}
SplashViewController
class SplashViewController: UIViewController {
}
Very basic I know. Normally, in Objective-C I would init a nib name and set the view controller to that. What's the main difference in Swift?

Answer 1

This line:
var rootview: SplashViewController = SplashViewController()
...calls SplashViewController's init method. But you have not given SplashViewController any init method. Give it one.
What I usually do is specify the nib in my init override; for example:
override init() {
super.init(nibName:"SplashViewController", bundle:nil)
}
If you don't do something along those lines, the view controller won't find its nib and you'll end up with a black screen.
Note that that code will very likely net you a new error message complaining that you didn't implement init(coder:); so you'll have to implement it, even if only to throw an error if it is accidentally called:
required init(coder: NSCoder) {
fatalError("NSCoding not supported")
}