How to change device Volume on iOS - not music volume

Question

I want to change the device volume on iOS (iphone).

I know that i can change the volume of music library with this lines below:

//implement at firs         


        

Answer 1

Creating MPVolumeView on the fly to get the slider and set the volume doesn't work in iOS 11.4 anymore. I solved the issue by adding new MPVolumeView to my UIViewController view, otherwise it didn't set the volume. As I added it to the controller I also need to set the volume view position to be outside of the screen.

The code is in Swift 4:

let volumeControl = MPVolumeView(frame: CGRect(x: 0, y: 0, width: 120, height: 120))

override func viewDidLoad() {
   self.view.addSubview(volumeControl);
}

override func viewDidLayoutSubviews() {
   volumeControl.frame = CGRect(x: -120, y: -120, width: 100, height: 100);
}

func setMaxVolume() {
    let lst = volumeControl.subviews.filter{NSStringFromClass($0.classForCoder) == "MPVolumeSlider"}
    let slider = lst.first as? UISlider

    slider?.setValue(1, animated: false)
}