February 13 2010
iPhone Tip: Capturing a Shake Event
It’s very easy to detect a shake event in an iPhone app. There are many good posts on StackOverflow about it, but I wanted to consolidate the code into the minimal number of lines. The key is the motionEnded:withEvent: delegate and the view becoming the first responder.
-(BOOL)canBecomeFirstResponder {
return YES;
}
- (void) viewDidAppear:(BOOL)animated {
[self becomeFirstResponder];
[super viewDidAppear:animated];
}
- (void) viewDidDisappear:(BOOL)animated {
[self resignFirstResponder];
[super viewDidDisappear:animated];
}
- (void)motionEnded:(UIEventSubtype)motion withEvent:(UIEvent *)event {
if (event.subtype == UIEventSubtypeMotionShake) {
// TODO: insert code here.
}
[super motionEnded:motion withEvent:event];
}
