iOS: Make UIViewController's view work both in iPhone 5 and iPhone 6

Create a base view controller overriding ViewDidLoad:

BaseViewController.m

- (void)viewDidLoad

{

    [super viewDidLoad];

    

    CGRect frame = self.view.frame;

    CGRect anotherFrame = [UIApplication sharedApplication].keyWindow.frame;

    CGFloat scaleX = anotherFrame.size.width / frame.size.width;

    CGFloat scaleY = anotherFrame.size.height / frame.size.height;

    

    if(scaleX > 1 && scaleY > 1) {

        self.view.transform = CGAffineTransformMakeScale(scaleX, scaleY);

        

    }

    ...

}