Question

So I have a method then when called generates a simple UIView with some labels in it:

UIView *view1 = [[UIView alloc] initWithFrame:CGRectMake(50, 50, 300, 250)];
view1.backgroundColor = [UIColor redColor];
view1.userInteractionEnabled = YES;
[self.view addSubview:view1];

I call this method 6 times so it places 6 UIViews (I give them different coordinates of course) around the screen.

How can I detect when a user swipes right on one of them and then trigger some other method?
I’ve tried something like this:

UISwipeGestureRecognizer *swipeRight = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(myLabel1Tap)];
swipeRight.direction = UISwipeGestureRecognizerDirectionRight;
[view1 addGestureRecognizer:swipeRight];

and then a method:

- (void)myLabel1Tap {
}

But I’m not sure what to do inside that method, how can I know which view was swiped if they are all called the same ‘view1’?

Answer 1

change the gesture recognizers selector to accept an argument (by adding a colon after the method signature)

UISwipeGestureRecognizer *swipeRight = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(myLabel1Swipe:)];

this will mean the gesture recognizer will get passed in, and then you can perform actions based on the gesture recognizers properties, e.g.

- (void)myLabel1Swipe:(UISwipeGestureRecognizer *)recogniser
{
    UIView *swipedView = [recognizer view];
    //do whatever you want with this view
}