Using UIScreen to drive a VGA display - doesn't seem to show the UIWindow?
- by Peter Hajas
HI there,
I'm trying to use UIScreen to drive a separate screen with the VGA dongle on my iPad.
Here's what I've got in my root view controller's viewDidLoad:
//Code to detect if an external display is connected to the iPad.
NSLog(@"Number of screens: %d", [[UIScreen screens]count]);
//Now, if there's an external screen, we need to find its modes, itereate through them and find the highest one. Once we have that mode, break out, and set the UIWindow.
if([[UIScreen screens]count] > 1) //if there are more than 1 screens connected to the device
{
CGSize max;
UIScreenMode *maxScreenMode;
for(int i = 0; i < [[[[UIScreen screens] objectAtIndex:1] availableModes]count]; i++)
{
UIScreenMode *current = [[[[UIScreen screens]objectAtIndex:1]availableModes]objectAtIndex:i];
if(current.size.width > max.width);
{
max = current.size;
maxScreenMode = current;
}
}
//Now we have the highest mode. Turn the external display to use that mode.
UIScreen *external = [[UIScreen screens] objectAtIndex:1];
external.currentMode = maxScreenMode;
//Boom! Now the external display is set to the proper mode. We need to now set the screen of a new UIWindow to the external screen
external_disp = [externalDisplay alloc];
external_disp.drawImage = drawViewController.drawImage;
UIWindow *newwindow = [UIWindow alloc];
[newwindow addSubview:external_disp.view];
newwindow.screen = external;
}
