Programmatically trigger shake event iOS

Question

How can I programmatically trigger the shake event in iOS?

I've tried the following but it keeps crashing...

+ (void)shake {
    NSLog(@"TEST");

    UIMotionEventProxy *m = [[NSClassFromString(@"UIMotionEvent") alloc] _init];

    m->_subtype = UIEventSubtypeMotionShake;
    m->_shakeState = 1;

    [[[UIApplication sharedApplication] keyWindow] motionBegan:UIEventSubtypeMotionShake withEvent:m];
    [[[UIApplication sharedApplication] keyWindow] motionEnded:UIEventSubtypeMotionShake withEvent:m];
}

What does apple do in the simulator under Hardware > Shake Gesture?

Answer 1

Try to replace

UIMotionEventProxy *m = [[NSClassFromString(@"UIMotionEvent") alloc] _init];

with

UIMotionEventProxy *m = [[UIMotionEventProxy alloc] _init];

I guess it's crushing when NSClassFromString(@"UIMotionEvent") returns nil.