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    <p>The following algorithm should be reviewed and of course optimized. It is only something that I have put together and I've not tested it.</p> <p>initialize each slider with a max and minimum value and set the inital value as desired, but respecting that <code>x + y + z = 1</code>.</p> <pre><code>[self.slider1 setMinimumValue:0.0]; [self.slider1 setMaximumValue:1.0]; [self.slider1 setValue:0.20]; [self.slider2 setMinimumValue:0.0]; [self.slider2 setMaximumValue:1.0]; [self.slider2 setValue:0.30]; [self.slider3 setMinimumValue:0.0]; [self.slider3 setMaximumValue:1.0]; [self.slider3 setValue:0.50]; </code></pre> <p>Set the three slider to the same selector:</p> <pre><code>[self.slider1 addTarget:self action:@selector(valueChanged:) forControlEvents:UIControlEventValueChanged]; [self.slider2 addTarget:self action:@selector(valueChanged:) forControlEvents:UIControlEventValueChanged]; [self.slider3 addTarget:self action:@selector(valueChanged:) forControlEvents:UIControlEventValueChanged]; </code></pre> <p>The selector should do something like that:</p> <pre><code>- (void)valueChanged:(UISlider *)slider { UISlider *sliderX = nil; UISlider *sliderY = nil; UISlider *sliderZ = nil; if (slider == self.slider1) { sliderX = self.slider1; sliderY = self.slider2; sliderZ = self.slider3; } else if (slider == self.slider2) { sliderY = self.slider1; sliderX = self.slider2; sliderZ = self.slider3; } else { sliderY = self.slider1; sliderZ = self.slider2; sliderX = self.slider3; } float x = sliderX.value; float y = sliderY.value; float z = sliderZ.value; // x + y + z = 1 // Get the amout x has changed float oldX = 1 - y - z; float difference = x - oldX; float newY = y - difference / 2; float newZ = z - difference / 2; if (newY &lt; 0) { newZ += y + newY; newY = 0; } if (newZ &lt; 0) { newY += z + newZ; newZ = 0; } [sliderY setValue:newY animated:YES]; [sliderZ setValue:newZ animated:YES]; } </code></pre> <p>If there is something wrong with this code, please let me know, and I can fix it!</p>
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    1. COThanks a million ! Your code does exactly what I've been trying to do. It would have taken me a hundred years to hatch something like that. Thanks for making others grow...
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