iPhone:Programming UISlider to position at clicked location

Question

Hello ,

How to set the slider to clicked position and get the slider value on the clicked location on UISlider in iPhone programming. i know we can drag the slider to that position but i dont want to do it. Can you please tel me how to set the slider to clicked position? Is this possible to do?

Answer 1

You can simply add a UITapGestureRecognizer to the slider, then pull out the UIEvent and Touches associated with it to figure out where along the UISlider the tap took place. Then set your slider's value to this calculated value.

UPDATE:

First, setup your slider and add the gesture recognizer to it.

UISlider *slider = [[[UISlider alloc] init] autorelease];
…
<slider setup>
…
UITapGestureRecognizer *gr = [[[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(sliderTapped:)] autorelease];
[slider addGestureRecognizer:gr];

Then implement the selector

- (void)sliderTapped:(UIGestureRecognizer *)gestureRecognizer {
    <left as a user excercise*>
}

*Hint: Read the docs to figure out how to get the locationInView extrapolated and figure out what the slider should be