如何呈现更小的视图控制器

我想要以比屏幕更小的尺寸呈现视图控制器 vc2，如何在 Swift 3 中做到这一点？感谢帮助。 这是我的代码：

@IBAction func leftButtonPressed(_ sender: UIButton) {
    let vc2 = self.storyboard?.instantiateViewController(withIdentifier: "Controller2") as! ViewController2
    vc2.modalPresentationStyle = .currentContext

    present(vc2, animated: true, completion: nil)
}

尝试这个..

@IBAction func leftButtonPressed(_ sender: UIButton) {
    let vc2 = self.storyboard?.instantiateViewController(withIdentifier: "Controller2") as! ViewController
    vc2.providesPresentationContextTransitionStyle = true
    vc2.definesPresentationContext = true
    vc2.modalPresentationStyle=UIModalPresentationStyle.overCurrentContext
    self.present(vc2, animated: true, completion: nil)

    // Make sure your vc2 background color is transparent
    vc2.view.backgroundColor = UIColor.clear
}