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animate wave with color

Hello. Thanks you for great lib. I have a question : I want to animate the realColor when progress < 20, or > 50,.. etc. I used loop with delay then it's seem animating wave is success, but I can not change this real color when animating.

Here is my code:

- (void) animateGasPercent:(NSTimer *)timer{
    if(!timer){
        [NSTimer scheduledTimerWithTimeInterval:0.5f
                                         target:self
                                       selector:@selector(animateGasPercent:)
                                       userInfo:[NSNumber numberWithInt:0]
                                        repeats:NO];
    }else{
        NSNumber *i = timer.userInfo;
        if([i intValue] >= percentGas)
            return;
        _progress.progress = [i floatValue]/100;
        NSLog(@"i: %@  - color: %@", i, _progress.realWaveColor);
        if([i intValue] < 20){
            if(_progress.realWaveColor != [UIColor redColor]){
                [_progress setRealWaveColor:[UIColor redColor]];
            }
        }else if([i intValue] < 80){
             if(_progress.realWaveColor != [UIColor orangeColor]){
                 [_progress setRealWaveColor:[UIColor orangeColor]];
             }
        }else{
            if(_progress.realWaveColor != [UIColor orangeColor]){
                [_progress setRealWaveColor:[Utils colorFromHexString:GREEN_COLOR]];
            }
        }
        [NSTimer scheduledTimerWithTimeInterval:0.02f
                                         target:self
                                       selector:@selector(animateGasPercent:)
                                       userInfo:[NSNumber numberWithInt:[i intValue] + 1]
                                        repeats:NO];
    }
}

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