Core Plot: Creating a CPTImage with imageWithCGImage

Question

I am trying to create a bar with a gradient in core plot. I have the following code:

UIImage *img = [UIImage imageNamed:@"orange_bar_graph"];

CPTImage *image = [CPTImage imageWithCGImage:img.CGImage];
image.tiled = NO;
CPTFill *areaFill = [CPTFill fillWithImage:image];

CPTBarPlot *plotOne = [[CPTBarPlot alloc] init];
plotOne.fill = areaFill;
plotOne.identifier = identifer[@"plotOne"];

However when I run the application it just shows the outline of the bars and the fill image is not being shown:

If I place it breaks points it shows that the image is created successfully and that the variable areaFill is not nil.

I did a post a while back where I had this similar code working. Here I use imageForPNGFile but that was just returning nil when trying it here: Core Plot Gradient bars

However I can't seem to get it to work here.

Edit:

I have just ran this on the iPad 2 simulator and it works as expected. However when running on the iPad Air simulator it doesn't work.

Answer 1

Set the scale of the image.

CPTImage *image = [CPTImage imageWithCGImage:img.CGImage scale:img.scale];

If you're using the latest Core Plot code (after release 1.5.1), you can load the image directly:

CPTImage *image = [CPTImage imageNamed:@"orange_bar_graph"];