gistfile1.m

    float lastTick = 0.0;
    
    for (int i = 0; i <= 900; i++) {
        float t = [self tickX:9 timesOfTotal:900 current:i lastTick:lastTick];
        if (t > 0) {
            NSLog(@"%f %i",t,i);
            lastTick = t;
        }
    }


-(float)tickX:(int)times
        timesOfTotal:(float)total
        current:(float)current
        lastTick:(float)last
{
    float tickUnit = 1.0 / times;
    float ret = last + tickUnit;
    float oneUnit = total / times;
    float nextTick = ret * (times) * oneUnit;
    
    if (current == 0) return 0.000001;
    
    if (current >= total) return 1.0;
    
    if (current > nextTick)
    {
        return ret;
    }else{
        return  0.0;
    }
}