Hi,
I'm beginning to feel this above my pay grade as I can't seem to work it out.
I have a framework in Objective-C. I've been writing some tests for it, and to
make life fun I've been writing the tests in Swift.
I have a property of a class in the objective-c framework declared like so:
@property (nonatomic, copy) CGImageRef (^createImage)(NSDictionary *);
In my tests I'm trying to write a function that I can assign to the property.
In the most basic form the function looks like this, I'm ignoring the passed in
dictionary for the purposes of asking this question:
func createCGImage2(dictionary: [NSObject:AnyObject]) -> CGImage {
let jpegURL = NSBundle.mainBundle().URLForResource("myimage",
withExtension:"jpg")
let imageSource = CGImageSourceCreateWithURL(jpegURL, nil)!
let theImage = CGImageSourceCreateImageAtIndex(imageSource, 0, nil)
return theImage
}
When I try to set the property with the function I get:
error: cannot convert the expression's type '([NSObject : AnyObject]) ->
Unmanaged<CGImage>!' to type '(([NSObject : AnyObject]!) ->
Unmanaged<CGImage>!)!?'
Now, if I have a function declared like so:
func createCGImageFromDictionary(dictionary: [NSObject:AnyObject]!) ->
Unmanaged<CGImage>!
error: cannot convert the expression's type '([NSObject : AnyObject]!) ->
Unmanaged<CGImage>!' to type '(([NSObject : AnyObject]!) ->
Unmanaged<CGImage>!)!?'
I'm still a long way off. There's an extra () in there and an extra !? at the
end that I really don't know how to interpret. Also I don't know how to convert
the result of CGImageSourceCreateImageAtIndex to a Unmanaged<CGImage> as a
return value.
I've been through various bits of the documentation, but something isn't
clicking so that I understand how this stuff works so that I can try and solve
it.
Kevin
_______________________________________________
Cocoa-dev mailing list ([email protected])
Please do not post admin requests or moderator comments to the list.
Contact the moderators at cocoa-dev-admins(at)lists.apple.com
Help/Unsubscribe/Update your Subscription:
https://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com
This email sent to [email protected]
