Question

How can I use uislider to control alpha in uitextview?
Please provide code.
Thanks a lot.

Answer 1

If you have some class with instance variables _yourTextView and _yourSlider, use:

_yourSlider.minimumValue = 0;
_yourSlider.maximumValue = 1;
_yourSlider.value = 0.0;
[_yourSlider  addTarget:self action:@selector(sliderValueChanged:) forControlEvents:UIControlEventValueChanged];

And then, in the same class, define function:

- (void)sliderValueChanged:(UISlider *)sender {
    _yourTextView.alpha = sender.value;
}

The definition of UISlider and UITextView,i believe, you can do by yourself.