Error: CUICatalog: Invalid asset name supplied: (null), or invalid scale factor : 2.000000

Question

This one appears when someone is trying to put nil in [UIImage imageNamed:]

Add symbolic breakpoint for [UIImage imageNamed:]

Add $arg3 == nil condition on Simulator, $r0 == nil condition on 32-bit iPhone, or $x2 == nil on 64-bit iPhone.

Run your application and see where debugger will stop.

P.S. Keep in mind this also happens if image name is empty string. You can check this by adding [(NSString*)$x2 length] == 0 to the condition.

This error (usually) happens when you try to load an image with [UIImage imageNamed:myImage] but iOS is not sure if myImage is really a NSString and then you have this warning.

You can fix this using:

[UIImage imageNamed:[NSString stringWithFormat:@"%@", myImage]]

Or you can simply check for the length of the name of the UIImage:

if (myImage && [myImage length]) {

    [UIImage imageNamed:myImage];
}

Since the error is complaining that the name you gave is (null), this is most likely caused by calling [UIImage imageNamed:nil]. Or more specifically, passing in a variable hasn't been set, so it's equal to nil. While using stringWithFormat: would get rid of the error, I think there's a good chance it's not actually doing what you want. If the name you supply is a nil value, then using stringWithFormat: would result in it looking for an image that is literally named "(null)", as if you were calling [UIImage imageNamed:@"(null)"].

Something like this is probably a better option:

if (name) {
    UIImage *image = [UIImage imageNamed:name];
} else {
    // Do something else
}

You might want to set a breakpoint in Xcode on that "Do something else" line, to help you figure out why this code is getting called with a nil value in the first place.

In Xcode 6.4, this seems to occur when using "Selected Image" for a tab bar item in the storyboard, even if it's a valid image.

This doesn't actually seem to set the selected state image anyway, so it needs to be defined in User Defined Runtime Attributes, and removed from the SelectedImage attribute of the Tab Bar Item

In my case i was passing [UIImage imageNamed:@""] which caused me to show the warning. Just add breakpoints to all the lines where you have used imageNamed and the debug the line where you find the warning.

This happened to me after a storyboard was split into several (the actual change happened when I was on holidays, so I don't know exactly how it was done).

After inspecting the XML of the storyboards, I found that an image reference which previously had pointed to "bottomBar" in the assets catalogue instead pointed to imageView:fFo-1g-jzs:image.

At the end of the XML file under the <resources> tag was tag named <image name="imageView:fFo-1g-jzs:image"> containing a big mutableData blob.

After resetting the image reference in the storyboard and removing the blob, the error went away.