带有XCode 4的MPVolumeView（故事板）

Question

How do you make a slider that adjusts the volume level of the device with storyboarding? I haven't found any information on this relevant to XCode 4. Is MPVolumeView still the way to go? If so, how do I implement it?

Thanks.

Answer 1

You can still use an MPVolumeView in Xcode 4.x and iOS5. Simply import the MediaPlayer framework (link to it in your project settings, too) and use something like this:

MPVolumeView *volumeView = [[MPVolumeView alloc] initWithFrame:CGRectMake(0,0,120,15)];
[someView addSubview:volumeView];

This will give you the slider that will change system volume when dragged.

Answer 2

If you want to use a slider, you can add one to your view and link it to an action in the corresponding view controller. The action looks like this:

- (IBAction)volumeSliderChanged:(id)sender
{
    UISlider *slider = (UISlider *)sender;
    float newVolume = slider.value;
    // Set new volume
}