在 Swift 中加载 UIView 时自定义转换出错
Error with custom transition on loading UIView in Swift
我有一个包含多个元素的 UiViewcontroller。单击单元格上的 accessoryButtonType 时，它应该打开带有自定义转换的 window，但是在创建转换代码后，我的 UIViewController 根本不会加载。
通过添加断点，它在我的 viewDidLoad 方法后崩溃；
这是我的 viewController 脚本的第一部分及其 viewDidLoad 方法
class jeans: UIViewController, UITableViewDelegate{
@IBOutlet var insertion: UITableView!
@IBOutlet var continent: UITableView!
@IBOutlet var sizeOutputCell: UITableView!
var size = ["Size waist", "Size inseam"]
let customTransitionManager = TransitionManager()
override func viewDidLoad() {
super.viewDidLoad()
self.view.backgroundColor = UIColor(red:(239/255.0), green:(238/255.0), blue:(243/255.0), alpha: 1.0)
insertion.scrollEnabled = false;
continent.scrollEnabled = false;
let nib = UINib(nibName: "vwTableCell", bundle: nil)
self.insertion.registerNib(nib, forCellReuseIdentifier: "customCell")
let outputNib = UINib(nibName:"outputView", bundle:nil)
self.sizeOutputCell.registerNib(outputNib, forCellReuseIdentifier: "outputCell")
self.customTransitionManager.sourceViewController = self
}
这行代码在我的 TransitionManager.Class 中突出显示（第 128 行）：
let menuViewController = !self.presenting ? screens.from as! DetailedView : screens.to as! DetailedView
出现以下错误：
Could not cast value of type 'Converter.ViewController' (0x1000f7ce0) to 'Clothes_Converter.DetailedView' (0x1000f7f10).
这是它所在的方法：
func animateTransition(transitionContext: UIViewControllerContextTransitioning) {
// get reference to our fromView, toView and the container view that we should perform the transition in
let container = transitionContext.containerView()
// create a tuple of our screens
let screens : (from:UIViewController, to:UIViewController) = (transitionContext.viewControllerForKey(UITransitionContextFromViewControllerKey)!, transitionContext.viewControllerForKey(UITransitionContextToViewControllerKey)!)
// assign references to our menu view controller and the 'bottom' view controller from the tuple
// remember that our menuViewController will alternate between the from and to view controller depending if we're presenting or dismissing
let menuViewController = !self.presenting ? screens.from as! DetailedView : screens.to as! DetailedView
let topViewController = !self.presenting ? screens.to as UIViewController : screens.from as UIViewController
let menuView = menuViewController.view
let topView = topViewController.view
// prepare menu items to slide in
if (self.presenting){
self.offStageMenuControllerInteractive(menuViewController) // offstage for interactive
}
// add the both views to our view controller
container.addSubview(menuView)
container.addSubview(topView)
container.addSubview(self.statusBarBackground)
let duration = self.transitionDuration(transitionContext)
// perform the animation!
UIView.animateWithDuration(duration, delay: 0.0, options: nil, animations: {
if (self.presenting){
self.onStageMenuController(menuViewController) // onstage items: slide in
topView.transform = CGAffineTransformMakeTranslation(-container.frame.width, 0)
}
else {
topView.transform = CGAffineTransformIdentity
self.offStageMenuControllerInteractive(menuViewController)
}
}, completion: { finished in
// tell our transitionContext object that we've finished animating
if(transitionContext.transitionWasCancelled()){
transitionContext.completeTransition(false)
// bug: we have to manually add our 'to view' back http://openradar.appspot.com/radar?id=5320103646199808
UIApplication.sharedApplication().keyWindow!.addSubview(screens.from.view)
}
else {
transitionContext.completeTransition(true)
// bug: we have to manually add our 'to view' back http://openradar.appspot.com/radar?id=5320103646199808
UIApplication.sharedApplication().keyWindow!.addSubview(screens.to.view)
}
UIApplication.sharedApplication().keyWindow!.addSubview(self.statusBarBackground)
})
}
我该如何解决这个问题才能正常工作？我试图缩小崩溃的范围，但在我的 viewDidLoad 中添加了一个断点（最后）然后进入所有导致 xCode 崩溃的地方（因为它太多了）我还在每个方法之前添加了断点。
如果出于任何原因您需要完整的代码，可以在 github~ 上找到它：
https://github.com/bbriann123/Clothes/tree/master/Clothes_Converter/Clothes%20Converter
如有任何帮助，我们将不胜感激。
DetailedView 不是 ViewController，但您强迫它成为一个。
将as! DetailedView中的!改成as? DetailedView，剩下的自己说了算
这是代码
func animateTransition(transitionContext: UIViewControllerContextTransitioning) {
// get reference to our fromView, toView and the container view that we should perform the transition in
let container = transitionContext.containerView()
// create a tuple of our screens
let screens : (from:UIViewController, to:UIViewController) = (transitionContext.viewControllerForKey(UITransitionContextFromViewControllerKey)!, transitionContext.viewControllerForKey(UITransitionContextToViewControllerKey)!)
// assign references to our menu view controller and the 'bottom' view controller from the tuple
// remember that our menuViewController will alternate between the from and to view controller depending if we're presenting or dismissing
//Changed the ! to ?
let menuViewController = !self.presenting ? screens.from as? DetailedView : screens.to as? DetailedView
let topViewController = !self.presenting ? screens.to as UIViewController : screens.from as UIViewController
let menuView = menuViewController?.view
let topView = topViewController.view
// prepare menu items to slide in
if (self.presenting){
//self.offStageMenuControllerInteractive(menuViewController) // offstage for interactive
}
// add the both views to our view controller
container.addSubview(menuView!)
container.addSubview(topView)
//THROWS unexpected nil value while unwrapping.
//container.addSubview(self.statusBarBackground)
let duration = self.transitionDuration(transitionContext)
// perform the animation!
UIView.animateWithDuration(duration, delay: 0.0, options: .CurveEaseInOut , animations: {
if (self.presenting){
self.onStageMenuController(menuViewController!) // onstage items: slide in
topView.transform = CGAffineTransformMakeTranslation(-container.frame.width, 0)
}
else {
topView.transform = CGAffineTransformIdentity
self.offStageMenuControllerInteractive(menuViewController!)
}
}, completion: { finished in
// tell our transitionContext object that we've finished animating
if(transitionContext.transitionWasCancelled()){
transitionContext.completeTransition(false)
// bug: we have to manually add our 'to view' back http://openradar.appspot.com/radar?id=5320103646199808
UIApplication.sharedApplication().keyWindow!.addSubview(screens.from.view)
}
else {
transitionContext.completeTransition(true)
// bug: we have to manually add our 'to view' back http://openradar.appspot.com/radar?id=5320103646199808
UIApplication.sharedApplication().keyWindow!.addSubview(screens.to.view)
}
//THROWS unexpected nil value while unwrapping.
// UIApplication.sharedApplication().keyWindow!.addSubview(self.statusBarBackground)
})
}
我有一个包含多个元素的 UiViewcontroller。单击单元格上的 accessoryButtonType 时，它应该打开带有自定义转换的 window，但是在创建转换代码后，我的 UIViewController 根本不会加载。
通过添加断点，它在我的 viewDidLoad 方法后崩溃；
这是我的 viewController 脚本的第一部分及其 viewDidLoad 方法
class jeans: UIViewController, UITableViewDelegate{
@IBOutlet var insertion: UITableView!
@IBOutlet var continent: UITableView!
@IBOutlet var sizeOutputCell: UITableView!
var size = ["Size waist", "Size inseam"]
let customTransitionManager = TransitionManager()
override func viewDidLoad() {
super.viewDidLoad()
self.view.backgroundColor = UIColor(red:(239/255.0), green:(238/255.0), blue:(243/255.0), alpha: 1.0)
insertion.scrollEnabled = false;
continent.scrollEnabled = false;
let nib = UINib(nibName: "vwTableCell", bundle: nil)
self.insertion.registerNib(nib, forCellReuseIdentifier: "customCell")
let outputNib = UINib(nibName:"outputView", bundle:nil)
self.sizeOutputCell.registerNib(outputNib, forCellReuseIdentifier: "outputCell")
self.customTransitionManager.sourceViewController = self
}
这行代码在我的 TransitionManager.Class 中突出显示（第 128 行）：
let menuViewController = !self.presenting ? screens.from as! DetailedView : screens.to as! DetailedView
出现以下错误：
Could not cast value of type 'Converter.ViewController' (0x1000f7ce0) to 'Clothes_Converter.DetailedView' (0x1000f7f10).
这是它所在的方法：
func animateTransition(transitionContext: UIViewControllerContextTransitioning) {
// get reference to our fromView, toView and the container view that we should perform the transition in
let container = transitionContext.containerView()
// create a tuple of our screens
let screens : (from:UIViewController, to:UIViewController) = (transitionContext.viewControllerForKey(UITransitionContextFromViewControllerKey)!, transitionContext.viewControllerForKey(UITransitionContextToViewControllerKey)!)
// assign references to our menu view controller and the 'bottom' view controller from the tuple
// remember that our menuViewController will alternate between the from and to view controller depending if we're presenting or dismissing
let menuViewController = !self.presenting ? screens.from as! DetailedView : screens.to as! DetailedView
let topViewController = !self.presenting ? screens.to as UIViewController : screens.from as UIViewController
let menuView = menuViewController.view
let topView = topViewController.view
// prepare menu items to slide in
if (self.presenting){
self.offStageMenuControllerInteractive(menuViewController) // offstage for interactive
}
// add the both views to our view controller
container.addSubview(menuView)
container.addSubview(topView)
container.addSubview(self.statusBarBackground)
let duration = self.transitionDuration(transitionContext)
// perform the animation!
UIView.animateWithDuration(duration, delay: 0.0, options: nil, animations: {
if (self.presenting){
self.onStageMenuController(menuViewController) // onstage items: slide in
topView.transform = CGAffineTransformMakeTranslation(-container.frame.width, 0)
}
else {
topView.transform = CGAffineTransformIdentity
self.offStageMenuControllerInteractive(menuViewController)
}
}, completion: { finished in
// tell our transitionContext object that we've finished animating
if(transitionContext.transitionWasCancelled()){
transitionContext.completeTransition(false)
// bug: we have to manually add our 'to view' back http://openradar.appspot.com/radar?id=5320103646199808
UIApplication.sharedApplication().keyWindow!.addSubview(screens.from.view)
}
else {
transitionContext.completeTransition(true)
// bug: we have to manually add our 'to view' back http://openradar.appspot.com/radar?id=5320103646199808
UIApplication.sharedApplication().keyWindow!.addSubview(screens.to.view)
}
UIApplication.sharedApplication().keyWindow!.addSubview(self.statusBarBackground)
})
}
我该如何解决这个问题才能正常工作？我试图缩小崩溃的范围，但在我的 viewDidLoad 中添加了一个断点（最后）然后进入所有导致 xCode 崩溃的地方（因为它太多了）我还在每个方法之前添加了断点。
如果出于任何原因您需要完整的代码，可以在 github~ 上找到它： https://github.com/bbriann123/Clothes/tree/master/Clothes_Converter/Clothes%20Converter
如有任何帮助，我们将不胜感激。
DetailedView 不是 ViewController，但您强迫它成为一个。
将as! DetailedView中的!改成as? DetailedView，剩下的自己说了算
这是代码
func animateTransition(transitionContext: UIViewControllerContextTransitioning) {
// get reference to our fromView, toView and the container view that we should perform the transition in
let container = transitionContext.containerView()
// create a tuple of our screens
let screens : (from:UIViewController, to:UIViewController) = (transitionContext.viewControllerForKey(UITransitionContextFromViewControllerKey)!, transitionContext.viewControllerForKey(UITransitionContextToViewControllerKey)!)
// assign references to our menu view controller and the 'bottom' view controller from the tuple
// remember that our menuViewController will alternate between the from and to view controller depending if we're presenting or dismissing
//Changed the ! to ?
let menuViewController = !self.presenting ? screens.from as? DetailedView : screens.to as? DetailedView
let topViewController = !self.presenting ? screens.to as UIViewController : screens.from as UIViewController
let menuView = menuViewController?.view
let topView = topViewController.view
// prepare menu items to slide in
if (self.presenting){
//self.offStageMenuControllerInteractive(menuViewController) // offstage for interactive
}
// add the both views to our view controller
container.addSubview(menuView!)
container.addSubview(topView)
//THROWS unexpected nil value while unwrapping.
//container.addSubview(self.statusBarBackground)
let duration = self.transitionDuration(transitionContext)
// perform the animation!
UIView.animateWithDuration(duration, delay: 0.0, options: .CurveEaseInOut , animations: {
if (self.presenting){
self.onStageMenuController(menuViewController!) // onstage items: slide in
topView.transform = CGAffineTransformMakeTranslation(-container.frame.width, 0)
}
else {
topView.transform = CGAffineTransformIdentity
self.offStageMenuControllerInteractive(menuViewController!)
}
}, completion: { finished in
// tell our transitionContext object that we've finished animating
if(transitionContext.transitionWasCancelled()){
transitionContext.completeTransition(false)
// bug: we have to manually add our 'to view' back http://openradar.appspot.com/radar?id=5320103646199808
UIApplication.sharedApplication().keyWindow!.addSubview(screens.from.view)
}
else {
transitionContext.completeTransition(true)
// bug: we have to manually add our 'to view' back http://openradar.appspot.com/radar?id=5320103646199808
UIApplication.sharedApplication().keyWindow!.addSubview(screens.to.view)
}
//THROWS unexpected nil value while unwrapping.
// UIApplication.sharedApplication().keyWindow!.addSubview(self.statusBarBackground)
})
}