Button event when end touch - ios

Question

I want to make voice recorder app. The
recording should start when long touch begins and the
recording must end when user stops the gesture on the button.
UIGestureRecognizer *longGesture=[[UILongPressGestureRecognizer alloc]initWithTarget:self action:#selector(startrecording)];
How can I handle that when the user leaves the button?

Answer 1

in viewDidLoad method
UILongPressGestureRecognizer *longPressOnButton = [[UILongPressGestureRecognizer alloc] initWithTarget:self action:#selector(longPressOnButton:)];
longPressOnButton.delegate = self;
btn.userInteractionEnabled = YES;
[btn addGestureRecognizer:longPressOnButton];
- (void)longPressOnButton:(UILongPressGestureRecognizer*)gesture
{
// When you start touch the button
if (gesture.state == UIGestureRecognizerStateBegan)
{
//start recording
}
// When you stop touch the button
if (gesture.state == UIGestureRecognizerStateEnded)
{
//end recording
}
}
Also you can try or use the touchEvent concept
- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)e {
// show touch-began state
}
- (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)e {
}
- (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)e {
UITouch *touch = [touches anyObject];
.....
}
- (void)touchesCancelled:(NSSet *)touches withEvent:(UIEvent *)e {
}

Answer 2

As user3182143 said, using a UILongPressGestureRecorgnizer will solve your problem, but if you are interested there is another way using a UIButton. No need to add a UILongPressGestureRecorgnizer!
From your storyboard, drag an IBAction for a UIButton. And while you are adding its name, change the event to Touch Down.
Now drag another IBAction for the same UIButton and while changing its name, change the event to Touch up Inside (if it isn't that already).
- (IBAction)touchDownButtonAction:(UIButton *)sender {
NSLog(#"Start");
}
- (IBAction)touchUpInsideButtonAction:(UIButton *)sender {
NSLog(#"End");
}
Handle your recording based on the actions!
Here is a screenshot just in case: