Objective-C: Name of the method that adjust floating point value to 0-1

I created the following method to use rate safely.
(Sometimes rate can become invalid value like INFINITY, NAN, or out of 0-1)

-(double)XXXX:(double)rate
    if (rate >= 1) {
         return 1;
    } else if (rate <= 0) {
        return 0;
    } else if (0 <= rate && rate <= 1) {
        return rate;
    } else {
        return 0;
    }
}

What should I name this method?

EDIT:
I use rate to display progress of time with UISlider, UIProgress, or just NString(XX %).

Usage of the method are:

rate = [objectOrClass XXXX: currentTime / totalTime];
rate = [objectOrClass XXXX:(currentTime + additionalTime) / totalTime];

I also use it to calculate currentTime from rate:

currentTime = [objectOrClass XXXX:rate] * totalTime;

-(double) adjustRate:(double)rate;