ios – 视图控制器的交互式视图控制器从状态栏隐藏

这是我的 demo project.

我有两个视图控制器.主要的状态栏隐藏,第二个没有.

我创建了一个自定义驱动的转换动画,从控制器一到控制器二.

当我在子视图控制器(橙色)时,我通过从上到下平移开始驱动转换.您可以看到状态栏在拖动时回来.而UIButton“Hello”也在移动.

我取消了转换.然后我再次启动它,你可以看到状态栏也回来了,但这一次,我的按钮没有移动,它保持在同一个位置,好像状态栏仍然隐藏.

任何想法为什么一旦过渡被取消至少一次,它会表现如此？

(我甚至没有谈论动画的奇怪的事情,在取消时可能会翻倍(可能是模拟器的错误,因为它不会在我的iPhone 6 9.1和我的iphone 5 8.4上)

解决方法

添加：import Foundation

然后添加一个插座：

类ViewController：UIViewController {
@IBOutlet weak var topConstraint：NSLayoutConstraint！
…
}

然后,当视图消失时,将值更改为0,然后将其显示为20：

override func viewWillAppear(animated: Bool) {
    topConstraint.constant = 20.0
}

override func viewWillDisappear(animated: Bool) {
    topConstraint.constant = 0.0
}

完整的代码(确保记住将限制连接到插座)：

import UIKit
import Foundation

class ViewController: UIViewController {

    @IBOutlet weak var topConstraint: NSLayoutConstraint!
    let controllerTransition = InteractiveControllerTransition(gestureType: .Pan)
    let controllerTransitionDelegate = ViewController2Transition()

    override func viewDidLoad() {
        super.viewDidLoad()
        // Do any additional setup after loading the view,typically from a nib.

        controllerTransition.delegate = controllerTransitionDelegate
        controllerTransition.edge = .Bottom


    }

    override func viewWillAppear(animated: Bool) {
        topConstraint.constant = 20.0
    }

    override func viewWillDisappear(animated: Bool) {
        topConstraint.constant = 0.0
    }

    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    }

    @IBAction func unwindToViewController(sender: UIStoryboardSegue) { }

    override func prefersStatusBarHidden() -> Bool {
        return false
    }

    @IBAction func helloButtonAction(sender: UIButton) {
//      let storyBoard = UIStoryboard(name: "Main",bundle: nil)
//      let vc = storyBoard.instantiateViewControllerWithIdentifier("ViewController2") as! ViewController2
//      
//      vc.transitioningDelegate = controllerTransition
//      controllerTransition.toViewController = vc
//      
//      self.presentViewController(vc,animated: true,completion: nil)

        let storyBoard = UIStoryboard(name: "Main",bundle: nil)
//      let nvc = storyBoard.instantiateViewControllerWithIdentifier("NavigationViewController2") as! UINavigationController
//      let vc = nvc.topViewController as! ViewController2

        let vc = storyBoard.instantiateViewControllerWithIdentifier("ViewController2") as! ViewController2





//      nvc.transitioningDelegate = controllerTransition
        vc.transitioningDelegate = controllerTransition
        controllerTransition.toViewController = vc

//      self.presentViewController(nvc,completion: nil)
        self.presentViewController(vc,completion: nil)

    }

}