How to implement a volume key shutter for iPhone?

Question

I want to implement the same behavior with the native camera of iOS5:

• press the volume + button to take a photo

What\'s the

Answer 1

Building on huxia's code, this works on ios5+, no need to run the code every time it becomes active, just run it once in the beginning.

// these 4 lines of code tell the system that "this app needs to play sound/music"
AVAudioPlayer* p = [[AVAudioPlayer alloc] initWithContentsOfURL:[NSURL fileURLWithPath:[[[NSBundle mainBundle] resourcePath] stringByAppendingPathComponent:@"photoshutter.wav"]] error:NULL];
[p prepareToPlay];
[p stop];

//make MPVolumeView Offscreen
CGRect frame = CGRectMake(-1000, -1000, 100, 100);
MPVolumeView *volumeView = [[MPVolumeView alloc] initWithFrame:frame];
[volumeView sizeToFit];
[self.view addSubview:volumeView];