nsslider.integerValue requires me to focus on another app before updating the value

Question

I have an `NSSlider` in my macos app, called `wave_mode_slider`. What I'm trying to do is update the value of said slider on input. So, what I did is this: ``` self.wave_mode_slider?.integerValue = ("\(params[2])" as NSString).integerValue ``` This sets the value of the slider (white dot) to the value of the input as intended. However, before I see any actual result, I have to click outside of the application, which causes the white dot of the slider to jump to it's new value. as shown here: Is there a way to make the slider update immediately? My slider is created like this: ``` self.wave_mode_slider = NSSlider(frame:CGRect(x: 10, y: 100, width: 20, height: 300)) self.wave_mode_slider?.cell = OWOWSliderVertical() self.wave_mode_slider?.maxValue = 127 self.wave_mode_slider?.target = self self.view?.addSubview(self.wave_mode_slider!) ``` I tried to set the `isContinuous` property of the slider to true, but that doen't change the outcome. edit: ``` var midiClient : MIDIClientRef = 0 var…

Accepted Answer

In the end it was pretty easy, as soon as i saw Willeke's comment about the threading, I just used the main thread to set the value on:

```
DispatchQueue.main.async {
    mySelf.wave_mode_slider?.floatValue = ("\(params[2])" as NSString).floatValue
}
```

nsslider.integerValue requires me to focus on another app before updating the value

Solution

Problem