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)
}
}
