title: iOS: Autolayout not showing correct size in iPhone
body: <p>I am making one app, in which I need to show two buttons at bottom named Sign In and Login. I have used Autolayout for this, beacuase I need to support all iPhone device. It's working till iPhone 5S and showing correct.However in iPhone 6 Sign Up button is not expanding its width. I am doing something wrong, but not sure where. Below is my code.</p>
  
  <p>Attach is the screenshot also.<img src="https://i.stack.imgur.com/aWq1b.png" alt="enter image description here"></p>
  
  <pre><code>NSDictionary *viewsDictionary = @{@"loginButton":self.loginButton};
  
  //Define the LoginButton Size
  
  NSArray *constraint_H = [NSLayoutConstraint constraintsWithVisualFormat:@"V:[loginButton(52)]" options:0 metrics:nil views:viewsDictionary];
  NSArray *constraint_V = [NSLayoutConstraint constraintsWithVisualFormat:@"H:[loginButton(160)]" options:0 metrics:nil views:viewsDictionary];
  
  [self.loginButton addConstraints:constraint_H];
  [self.loginButton addConstraints:constraint_V];
  
  //Define the LoginView Postion
  
  NSArray *constraint_POS_V = [NSLayoutConstraint constraintsWithVisualFormat:@"V:[loginButton]-0-|" options:0 metrics:nil views:viewsDictionary];
  NSArray *constraint_POS_H = [NSLayoutConstraint constraintsWithVisualFormat:@"H:|-0-[loginButton]" options:0 metrics:nil views:viewsDictionary];
  
  [self.view addConstraints:constraint_POS_V];
  [self.view addConstraints:constraint_POS_H];
  
  //Define the SignInButton Size
  
  NSDictionary *yellowDictionary = @{@"signInButton":self.signInButton};
  
  NSArray *yellow_constraint_H = [NSLayoutConstraint constraintsWithVisualFormat:@"V:[signInButton(52)]" options:0 metrics:nil views:yellowDictionary];
  NSArray *yellow_constraint_V = [NSLayoutConstraint constraintsWithVisualFormat:@"H:[signInButton(160)]" options:0 metrics:nil views:yellowDictionary];
  
  [self.signInButton addConstraints:yellow_constraint_H];
  [self.signInButton addConstraints:yellow_constraint_V];
  
  
  //Define the SignInView Postion
  
  NSArray *yellowconstraint_POS_V = [NSLayoutConstraint constraintsWithVisualFormat:@"V:[signInButton]-0-|" options:0 metrics:nil views:yellowDictionary];
  NSArray *yellowconstraint_POS_H = [NSLayoutConstraint constraintsWithVisualFormat:@"H:|-161-[signInButton]" options:0 metrics:nil views:yellowDictionary];
  
  [self.view addConstraints:yellowconstraint_POS_V];
  [self.view addConstraints:yellowconstraint_POS_H];
  </code></pre>