当用户在其他地方点击时，如何将第一个应答器从文本字段中退出?

I have filled my view with ScrollView (same size as the view) and I'm stuck at how to resign first responder when user tap elsewhere in the View (or the scrollview). Any idea on how to do that ? I'm using the following method but it's not working as expected:I have filled my view with ScrollView (same siz