Question

This is a weird one, but I think I’m just missing something simple.

I have an Objective C class called Theme.
Themes load all the art for my game from files and stores them in a NSMutableArray.

When the app launches it reates a new Theme object.
Part of the loading process does something like this:

UIImage *image = [self mergeImage: bg toImage: overlay];
[imageArray addObject: image];

I take a background image and place the overlay on top of it, creating a new UIImage, by using this code:

- (UIImage *)mergeImage:(UIImage *)image1 toImage:(UIImage *)image2 { 
UIGraphicsBeginImageContext(image1.size);  

[image1 drawInRect:CGRectMake(0, 0, image1.size.width, image1.size.height)];  

[image2 drawInRect:CGRectMake(0, 0, image2.size.width, image2.size.height)];  

UIImage *resultingImage = UIGraphicsGetImageFromCurrentImageContext();  
//[resultingImage retain];

UIGraphicsEndImageContext();  

return resultingImage;
} 

All of this happens in the init function of Theme.
Here’s the problem, when I call [[Theme alloc] init] from

-(BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions

The app crashes a second later, leaving me with no stack or anything(I figure it screws up some memory and crashes later when it uses it again or something).

Here’s the weird part. If I don’t add the newly merged image to the imageArray, it never crashes. I don’t have the image anymore, but there’s no crash. Also, if I don’t add the image to the array, but I retain it in the mergeImage function, it does crash, which makes me think that retaining this newly-made image is causing the problem.
Weirder still, if I don’t call mergeImage until later on in the app, outside of teh [Theme init] and didFinishLaunchingWithOptions, it’s OK.

Any idea why? What’s wrong with retaining this image when the app first launches?

Answer 1

Try this Below Code:

UIGraphicsBeginImageContext(drawImage.bounds.size); 
[drawImage.layer renderInContext:UIGraphicsGetCurrentContext()]; 
UIImage *viewImage = UIGraphicsGetImageFromCurrentImageContext(); 
UIGraphicsEndImageContext();
return viewImage

Thanks..!