title: How to make any subview flexible with respect to the frame of the type of iPhone i.e., iPhone 5, 5S, 6, 6+?
body: <p>I have to add a text filed and it is 210X30 for iPhone 5. I want it to stretched according to iPhone 6 and iPhone6+. I don't want to fix the width or height of the text field and also don't want to fix the horizontal spacing from the edges of the iPhone. I want it to be flexible and maintain the ratio of the space which it has in case of iPhone 5. Kindly let me know what kind of Constraints I need to put in order to achieve that.
  Please let me know if my question is Unclear I will explain in detail as I am sure this scenario will be faced by each and every iOS Developer shortly. </p>