How to set UIWindow property in Swift

Question

Ive been trying to make a simple change in UIWindow bounds in Swift. So far I have:

func application(application: UIApplication, didFinishLaunchingWithOptions launchOptions:NSDictionary?) -> Bool { // Override point for customization after application launch. //SHIFT EVERYTHING DOWN - THEN UP IN INDIV VCs IF ios7> var device:UIDevice=UIDevice() var systemVersion:String=device.systemVersion println(systemVersion) //Float(systemVersion) if (systemVersion >= "7.0") { UIApplication.sharedApplication().setStatusBarStyle(UIStatusBarStyle.LightContent, animated: true) self.window.setClipsToBounds = true // --> Member doesnt exist in UIWindow self.window.frame = CGRectMake(0,20,self.window.frame.size.width,self.window.frame.size.height); self.window.bounds = CGRectMake(0,0, self.window.frame.size.width, self.window.frame.size.height); //} let ok = true println("Hello World") return true }

but I get:

UIWindow does not have member named at each self.window.property setter line.

drewag · Accepted Answer · 2014-06-17 00:31:47Z

The problem is that self.window is an Optional. You first have to "unwrap" it. You also need to use clipsToBounds not setClipsToBounds.:

if let window = self.window { window.clipsToBounds = true window.frame = CGRect(x: 0, y: 20, width: window.frame.size.width, height: window.frame.size.height); window.bounds = CGRect(x: 0, y: 0, width: window.frame.size.width, height: window.frame.size.height); }

Note: I also updated CGRectMake to the preferred Swift way of creating CGRect using the CGRect initializer instead of the global CGRectMake function.

bdjett · Accepted Answer · 2014-06-17 00:40:58Z

In the AppDelegate class, window is an optional variable. You need to force unwrap the variable with !.

For example,

self.window!.clipsToBounds = true

If you aren't familiar with how optionals in Swift work, check out documentation from Apple about them.

Wow! And here I thought Swift was supposed to make coding more efficient. Thanks!

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