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iosiphoneuislider

UISlider limitations in IPhone

In UISlider Control if I set "MinimumValue = 0" & "MaximimValue=2000" then I am not able to set the exact value. On release of slider thumb image it changes the value to + or - 5 to10. My slider width = 225px.

For example:- if I try to set the slider value to 100 then on release of slider thumb it shows me result like 105 or 95.

Code

    IBOutlet UISlider * slider;

//"Slider" Object attached using XIB(.NIB)

slider.minimumValue = 0;
slider.maximumValue = 100;

//Attached Below Method Using XIB(.NIB) with "value Changed" event.

-(IBAction)slider_Change:(id)sender;
{

//Assigning value to UITextField
   textFiled.text = [NSString stringWithFormat:@"%d",(((int)    (slider.value)) * 20)];
}

enter image description here

Solution

  • Because you have set your slider range to be so large each pixel on the screen is equivalent to 8.888.

    2000 / 255 = 8.8888888889

    To get graduations of 1 you'll need to move the slider 1/8 of a pixel (this is impossible).

    Alternatives are:

    1. Make the slider longer
    2. Reduce the slider range
    3. Use a different control UIStepper