CoronaCards: Unity Integration — iOS

Example

To add the CoronaViewController and CoronaView to the view controller hierarchy, add a member in UnityAppController.h via the process outlined below. In this example, we’ll add a simple Corona project to the native Xcode Unity project, set to run as an overlay.

1. Add the following line to the UnityAppController interface:

CoronaViewController* _coronaController;

2. Add the following code at the end of the createViewHierarchy method in UnityAppController.mm:

- (void)createViewHierarchy
{
    //Unity Specific code
    //...
    //...
    //...

    //CoronaCards code
    _coronaController = [[[CoronaViewController alloc] init] autorelease];
    [_rootController addChildViewController:_coronaController];

    CoronaView *coronaView = (CoronaView *)_coronaController.view;

    //Define the region for CoronaCards - example is 100X100
    CGRect rect = CGRectMake(0,0,100,100);
    
    coronaView.frame = rect;
    
    [_rootView addSubview:coronaView];

    // Transparent background
    coronaView.backgroundColor = [UIColor clearColor];
    coronaView.opaque = NO;

    [coronaView run];
}

3. Add the following code to the beginning of the repaint method in UnityAppController.mm:

- (void)repaint
{
    //Added for OpenGL context
    [EAGLContext setCurrentContext:_mainDisplay->surface.context];

    //Unity Specific code
    //...
    //...
    //...
} 

Transparent Views

In iOS, a CoronaView can have transparent backgrounds. To accomplish this, two things are required:

First, instruct iOS to enable transparency in the UIView itself:

// [Obj-C]
coronaView.backgroundColor = [UIColor clearColor];
coronaView.opaque = NO;

Second, tell Corona to utilize an transparent OpenGL surface by setting the alpha key to 0:

-- [Lua]
display.setDefault( "background", 0, 0, 0, 0 )