Question

AI have a slider, I’m saving it’s value to user defaults, and then grabbing that number in a different view. I’m then converting that float to an NSNumber for use in a CiRadialGradient filter.

I’m saving the value like:

[[NSUserDefaults standardUserDefaults] setFloat:_alphaSlider.value forKey:@"Alpha"];

And retrieving like:

NSNumber *inRadius1 = [NSNumber numberWithFloat:[[NSUserDefaults standardUserDefaults] floatForKey:@"Alpha"]];

The problem is when grabbing the slider value and converting it to an NSNumber, I get the value of -1.10311e-146. I’d expect something different.

In my storyboard the slider value is set from 0 to 100. No matter where I place the slider, the value is always a large negative.

Any ideas?

Cheers.

Answer 1

I’d guess you’re logging it like this:

NSLog(@"%f", inRadius1);

But actually an NSNumber is an Objective-C object, so you should use %@:

NSLog(@"%@", inRadius1);