iphone响应地图长按事件 解决长按响应两次的问题

- (void)viewDidLoad
{
[super viewDidLoad];

[self addUserLongPressAction];

// Do any additional setup after loading the view from its nib.
}

-(void)addUserLongPressAction {
UILongPressGestureRecognizer *longPress = [[UILongPressGestureRecognizer alloc] initWithTarget:self action:@selector(addAnnotationForMap:)];

[longPress setMinimumPressDuration:0.8];
[myMapView addGestureRecognizer:longPress];
[longPress release];
}

- (void) addAnnotationForMap:(UILongPressGestureRecognizer*)press {
//解决响应两次的问题
if (press.state == UIGestureRecognizerStateEnded) {
return;
} else if (press.state == UIGestureRecognizerStateBegan) {
CGPoint point = [press locationInView:self.view];

CLLocationCoordinate2D coo = [myMapView convertPoint:point toCoordinateFromView:myMapView];

NSLog(@"经纬度:%lf, %lf", coo.longitude,  coo.latitude);
NSLog(@"调用一次");
}

return;
}