xcode 如何在 Swift 3 中向右滑动以显示新的视图控制器？
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How to swipe right to show new View Controller in Swift 3?
提问by RDowns
I want to be able to swipe right in my ViewControllerwhich will show another view controller, CommunitiesViewController.
我希望能够在我的右侧滑动，ViewController这将显示另一个视图控制器CommunitiesViewController.
I have looked on other threads and found some ways of doing this though I believe they are for Swift 2.
我查看了其他线程并找到了一些这样做的方法，尽管我相信它们适用于 Swift 2。
This is the code I am using in my ViewController:
这是我在我的代码中使用的代码ViewController：
override func viewDidLoad() {
super.viewDidLoad()
let swipeRight = UISwipeGestureRecognizer(target: self, action: Selector(("respondToSwipeGesture")))
swipeRight.direction = UISwipeGestureRecognizerDirection.right
self.view.addGestureRecognizer(swipeRight)
}
func respondToSwipeGesture(gesture: UIGestureRecognizer) {
print ("Swiped right")
if let swipeGesture = gesture as? UISwipeGestureRecognizer {
switch swipeGesture.direction {
case UISwipeGestureRecognizerDirection.right:
//change view controllers
let storyBoard : UIStoryboard = UIStoryboard(name: "Main", bundle:nil)
let resultViewController = storyBoard.instantiateViewController(withIdentifier: "CommunitiesID") as! CommunitiesViewController
self.present(resultViewController, animated:true, completion:nil)
default:
break
}
}
}
I have given CommunitiesViewControllera storyboard ID of CommunitiesID.
我给CommunitiesViewController了一个故事板 ID CommunitiesID。
But this does not work and the app crashes when I swipe right with the following error:
但这不起作用，当我向右滑动时应用程序崩溃并出现以下错误：
libc++abi.dylib: terminating with uncaught exception of type NSException
libc++abi.dylib：以未捕获的 NSException 类型异常终止
回答by Kike Gamboa
Try with:
尝试：
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view, typically from a nib.
// Gesture Recognizer
let swipeRight = UISwipeGestureRecognizer(target: self, action: #selector(self.respondToSwipeGesture))
swipeRight.direction = UISwipeGestureRecognizerDirection.right
self.view.addGestureRecognizer(swipeRight)
let swipeLeft = UISwipeGestureRecognizer(target: self, action: #selector(self.respondToSwipeGesture))
swipeLeft.direction = UISwipeGestureRecognizerDirection.left
self.view.addGestureRecognizer(swipeLeft)
}
then add the function:
然后添加函数：
func respondToSwipeGesture(gesture: UIGestureRecognizer) {
if let swipeGesture = gesture as? UISwipeGestureRecognizer {
switch swipeGesture.direction {
case UISwipeGestureRecognizerDirection.right:
//right view controller
let newViewController = firstViewController()
self.navigationController?.pushViewController(newViewController, animated: true)
case UISwipeGestureRecognizerDirection.left:
//left view controller
let newViewController = secondViewController()
self.navigationController?.pushViewController(newViewController, animated: true)
default:
break
}
}
}
回答by T. W
wrong selector format, change to:
错误的选择器格式，更改为：
action: #selector(respondToSwipeGesture)
func respondToSwipeGesture(gesture: UIGestureRecognizer)
or
或者
action: #selector(respondToSwipeGesture(_:))
func respondToSwipeGesture(_ gesture: UIGestureRecognizer)
