Set slider value - ios

Question

i try to set a value to a slider after a button click,
but it does not work - the slider does not move. the code runs fine without mistakes.
It should be pretty simple but I can't figure it out.
xCode Version 4.5.2
Thanks!
here my code:
ViewController.h
#import <UIKit/UIKit.h>
#interface ViewController : UIViewController
#property (weak, nonatomic) IBOutlet UILabel *debugLabel;
#property (weak, nonatomic) IBOutlet UISlider *slider;
- (IBAction)slider:(id)sender;
- (IBAction)ButtonChangeValue:(id)sender;
#end
ViewController.m
#import "ViewController.h"
#interface ViewController ()
#end
#implementation ViewController
#synthesize slider;
...
- (IBAction)slider:(UISlider *)sender {
float value = [sender value];
self.debugLabel.text = [NSString stringWithFormat:#"Value: %f",value];
}
- (IBAction)ButtonChangeValue:(id)sender {
slider.value = 90;
}

Answer 1

I think your problem is that the slider accepts values between 0.0 and 1.0 (default values, change them with _slider.maximumValue and _slider.minimumValue). Try setting the value to 0.9 instead of setting 90 (if you mean 90%).
If the slider updates but is not animated, use :
[_slider setValue:0.9 animated:YES];
Note that given your code, you may need to use self.slider instead of _slider.

Answer 2

try using
self.slider.value = 90;
instead of
slider.value = 90;

Answer 3

Check My Answer
- (void)viewDidLoad
{
UITapGestureRecognizer *gr = [[UITapGestureRecognizer alloc] initWithTarget:self action:#selector(sliderTapped:)];
[slider addGestureRecognizer:gr];
}
- (void)sliderTapped:(UIGestureRecognizer *)g
{
UISlider* s = (UISlider*)g.view;
if (s.highlighted)
return; // tap on thumb, let slider deal with it
CGPoint pt = [g locationInView: s];
CGFloat percentage = pt.x / s.bounds.size.width;
CGFloat delta = percentage * (s.maximumValue - s.minimumValue);
CGFloat value = s.minimumValue + delta;
[s setValue:value animated:YES];
NSString *str=[NSString stringWithFormat:#"%.f",[self.slider value]];
self.lbl.text=str;
}

Answer 4

To use slider.value = 90;
Your ViewController.h should be:
#import <UIKit/UIKit.h>
#interface ViewController : UIViewController
{
UISlider *slider;
}
#property (weak, nonatomic) IBOutlet UILabel *debugLabel;
#property (weak, nonatomic) IBOutlet UISlider *slider;
- (IBAction)slider:(id)sender;
- (IBAction)ButtonChangeValue:(id)sender;
#end
And don't forget #synthesize slider; in your ViewController.m as well.
Otherwise, use self.slider.value = 90; or _slider.value = 90;

Answer 5

For Swift, you can use:
slider.setValue(5.0, animated: true)

Answer 6

Since you are using interface builder first thing to look at would be: are the UI components (slider, button) connected to the IBOutlets in File's owner. This is the most common source of problems like this.
Then check the min and max of the slider (default is 0;1 - as rdurand mentioned).
And spider1983 is correct also: since slider is a property, you can address it as self.slider (or _slider, but you shouldn't use the last one in this case).

Answer 7

i think . as you have not mentioned maximum and minimum value of slider ,it is taking default max and min values that are 0 to 1. So it is not possible to set value =90. First change its max and min like this :
Slider.minimumValue = 1;
Slider.maximumValue = 100;
now try your thing ,
Slider.value =90;

Answer 8

Within view
#State private var value1: Double = 0.9
Then make reference
Slider(value: $value1)