How can I change the color of a UIWindow from a separate class?

Question

I am trying to change the background color of a UIWindow when an action is sent to the class MyController. However the UIWindow resides in the AppDelegate class so I don't have access to the variable to modify it using ``` window.backgroundColor = [UIColor theColor]; ``` in MyController. Here is the code for MyController.m: ``` @implementation MyController - (IBAction)sliderChanged:(id)sender { //want to call some method to change the UIWindow background color } @end ``` And here is the code for AppDelegate.h: ``` @interface AppDelegate : NSObject { UIWindow *window; } - (void)changeColorToRed:(int)r Green:(int)g Blue:(int)b; @property (nonatomic, retain) IBOutlet UIWindow *window; @end ``` I tried to implement a method changeColorToRed... in the AppDelegate class because that method has access to the variable `window`, but I had no way to call that from the `sliderChanged` method in MyController. How can I modify the UIWindow * window from another class?

Accepted Answer

```
[UIApplication sharedApplication].delegate.window.backgroundColor = [UIColor myColor];
```

If there's only 1 window,

```
[UIApplication sharedApplication].keyWindow.backgroundColor = [UIColor myColor];
```

How can I change the color of a UIWindow from a separate class?

Solution

Problem