ios - 当前模态未正确调整 View 大小

Question

我试图从 TableViewController 内的按钮呈现一个 ViewController(嵌入在 NavigationController 中)。呈现的 ViewController 应该是 TableViewController 高度的一半。我尝试过下面的代码，但它似乎不起作用(Swift 3)。有人可以帮忙吗？谢谢!

class AddNewRecipeTableViewController: UITableViewController, UIViewControllerTransitioningDelegate {
    @IBAction func popUpTest(_ sender: Any) {
        let storyboard = UIStoryboard(name: "Main", bundle: nil)
        let pvc = storyboard.instantiateViewController(withIdentifier: "popUpTest") as! UINavigationController

        pvc.modalPresentationStyle = UIModalPresentationStyle.custom
        pvc.transitioningDelegate = self
        self.present(pvc, animated: true, completion: nil)
    }

    func presentationControllerForPresentedViewController(presented: UIViewController, presentingViewController presenting: UIViewController!, sourceViewController source: UIViewController) -> UIPresentationController? {
        return HalfSizePresentationController(presentedViewController: presented, presenting: presentingViewController)
    }
}

class HalfSizePresentationController : UIPresentationController {
    override var frameOfPresentedViewInContainerView : CGRect {
        return CGRect(x: 0, y: 0, width: containerView!.bounds.width, height: containerView!.bounds.height/2)
    }
}

Answer 1

你有:

func presentationControllerForPresentedViewController(
    presented: UIViewController, 
    presentingViewController presenting: UIViewController!, 
    sourceViewController source: UIViewController) 
    -> UIPresentationController? {

该方法永远不会被调用，因为在 Swift 3 中它不对应于 Cocoa 知道的任何方法。 (我很惊讶你没有报告从编译器收到关于此的警告。)

您可能打算实现 presentationController(forPresented:presenting:source:)，如下所示:

func presentationController(
    forPresented presented: UIViewController, 
    presenting: UIViewController?, 
    source: UIViewController) 
    -> UIPresentationController? {

但即使这样也不会被调用，因为您尚未将呈现的 View Controller 的 modalPresentationStyle 设置为 .custom。