는 로그인의 버튼에 자동 레이아웃을 사용하여 메신저,이 버튼은 다양한 찾고, 코드를 작동하고
[self.view setNeedsLayout] ;
[self.view layoutIfNeeded];
[signInButton setTranslatesAutoresizingMaskIntoConstraints:NO];
[signInButton setStyle:kGPPSignInButtonStyleWide];
[signInButton setColorScheme:kGPPSignInButtonColorSchemeDark];
NSLayoutConstraint *vConstraint = [NSLayoutConstraint constraintWithItem:signInButton attribute:NSLayoutAttributeCenterY relatedBy:NSLayoutRelationEqual toItem:self.view attribute:NSLayoutAttributeCenterY multiplier:1 constant:0];
NSLayoutConstraint *hConstraint = [NSLayoutConstraint constraintWithItem:signInButton attribute:NSLayoutAttributeCenterX relatedBy:NSLayoutRelationEqual toItem:self.view attribute:NSLayoutAttributeCenterX multiplier:1 constant:0];
[self.view addConstraint:vConstraint];
[self.view addConstraint:hConstraint];