我有一个UICollectionView和这个方法：
override func collectionView(collectionView: UICollectionView, didSelectItemAtIndexPath indexPath: NSIndexPath) {
在这个方法中，我有这样的说法：
switch indexPath.item {
case 7:
switch boatTypeSelectedText {
case "Royal Boat":
if definitionSelectedText == "Used to carry the pharoah" {
if let cell = collectionView.cellForItemAtIndexPath(indexPath) {
cell.backgroundColor = UIColor.greenColor()
}
} else {
self.performSegueWithIdentifier("Game End", sender: self)
gameOutcomeLabel.text = "You Lost on level \(selectLevelBoatMatchingGame.currentLevel)!"
}
注意：gameOutComeLabel是segue应发送到的视图控制器的一部分，但该视图控制器与当前视图控制器是同一个类。在else语句中，我创建了一个performSegueWithIdentifier方法。触发此方法时，我在控制台中收到以下错误：
2014-12-18 16:52:39.908 SailingTheNile[31847:20249939] *** Assertion failure in -[SailingTheNile.BoatMatchingGame loadView], /SourceCache/UIKit_Sim/UIKit-3318.16.14/UICollectionViewController.m:166
2014-12-18 16:52:39.912 SailingTheNile[31847:20249939] *** Terminating app due to uncaught exception 'NSInternalInconsistencyException', reason: '-[UICollectionViewController loadView] loaded the "83r-qs-tQG-view-Zwj-3W-sDw" nib but didn't get a UICollectionView.'
*** First throw call stack:
(
0 CoreFoundation 0x002fd946 __exceptionPreprocess + 182
1 libobjc.A.dylib 0x01cd9a97 objc_exception_throw + 44
2 CoreFoundation 0x002fd7da +[NSException raise:format:arguments:] + 138
3 Foundation 0x00770810 -[NSAssertionHandler handleFailureInMethod:object:file:lineNumber:description:] + 118
4 UIKit 0x012545a8 -[UICollectionViewController loadView] + 597
5 UIKit 0x00c67fef -[UIViewController loadViewIfRequired] + 78
6 UIKit 0x00c68595 -[UIViewController view] + 35
7 UIKit 0x012db707 -[_UIFullscreenPresentationController _setPresentedViewController:] + 75
8 UIKit 0x00c3da81 -[UIPresentationController initWithPresentedViewController:presentingViewController:] + 113
9 UIKit 0x00c75a61 -[UIViewController _presentViewController:withAnimationController:completion:] + 2102
10 UIKit 0x00c785d2 __62-[UIViewController presentViewController:animated:completion:]_block_invoke + 345
11 UIKit 0x00c78424 -[UIViewController presentViewController:animated:completion:] + 224
12 UIKit 0x01140a94 -[UIStoryboardPresentationSegue perform] + 117
13 UIKit 0x0112db49 -[UIStoryboardSegueTemplate _perform:] + 217
14 UIKit 0x00c6a81c -[UIViewController performSegueWithIdentifier:sender:] + 72
15 SailingTheNile 0x00080207 _TFC14SailingTheNile16BoatMatchingGame14collectionViewfS0_FTCSo16UICollectionView24didSelectItemAtIndexPathCSo11NSIndexPath_T_ + 14391
16 SailingTheNile 0x00081b99 _TToFC14SailingTheNile16BoatMatchingGame14collectionViewfS0_FTCSo16UICollectionView24didSelectItemAtIndexPathCSo11NSIndexPath_T_ + 89
17 UIKit 0x012287e8 -[UICollectionView _selectItemAtIndexPath:animated:scrollPosition:notifyDelegate:] + 591
18 UIKit 0x01246022 -[UICollectionView _userSelectItemAtIndexPath:] + 191
19 UIKit 0x01246216 -[UICollectionView touchesEnded:withEvent:] + 492
20 libobjc.A.dylib 0x01cef7cd -[NSObject performSelector:withObject:withObject:] + 84
21 UIKit 0x00cc6254 forwardTouchMethod + 270
22 UIKit 0x00cc62c4 -[UIResponder touchesEnded:withEvent:] + 31
23 libobjc.A.dylib 0x01cef7cd -[NSObject performSelector:withObject:withObject:] + 84
24 UIKit 0x00cc6254 forwardTouchMethod + 270
25 UIKit 0x00cc62c4 -[UIResponder touchesEnded:withEvent:] + 31
26 UIKit 0x00b6260a -[UIWindow _sendTouchesForEvent:] + 874
27 UIKit 0x00b630e5 -[UIWindow sendEvent:] + 791
28 UIKit 0x00b28549 -[UIApplication sendEvent:] + 242
29 UIKit 0x00b3837e _UIApplicationHandleEventFromQueueEvent + 20690
30 UIKit 0x00b0cb19 _UIApplicationHandleEventQueue + 2206
31 CoreFoundation 0x002211df __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION__ + 15
32 CoreFoundation 0x00216ced __CFRunLoopDoSources0 + 253
33 CoreFoundation 0x00216248 __CFRunLoopRun + 952
34 CoreFoundation 0x00215bcb CFRunLoopRunSpecific + 443
35 CoreFoundation 0x002159fb CFRunLoopRunInMode + 123
36 GraphicsServices 0x02d0724f GSEventRunModal + 192
37 GraphicsServices 0x02d0708c GSEventRun + 104
38 UIKit 0x00b108b6 UIApplicationMain + 1526
39 SailingTheNile 0x0007546e top_level_code + 78
40 SailingTheNile 0x000754ab main + 43
41 libdyld.dylib 0x030b1ac9 start + 1
)
libc++abi.dylib: terminating with uncaught exception of type NSException
(lldb)
How can I prevent this error from happening and the performSegueWithIdentifier method to work? Let me know if I need to provide any more code. Thanks for the support!
答案 0 :(得分：0)
您必须在prepareForSegue()中执行此操作。你可以这样做：
func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
let destination = segue.destinationViewController as YourViewControllerName
destination.gameOutcomeLabel.text = "AnyText"
}
您要显示的文字必须与发件人一起“传输”或存储为公共变量。
答案 1 :(得分：0)
我在第二个ViewController中做了什么，我创建了第一个ViewController的实例：
class GameOutcome: UIViewController {
var boatMatchingGame: BoatMatchingGame!
然后，在我的第一个ViewController中，我设置了prepareForSegue方法，我这样做了：
override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
let gameOutcome = segue.destinationViewController as GameOutcome
gameOutcome.boatMatchingGame = self;
boatMatchingGame是我设置的实例。接下来，在viewDidLoad中，我通过传入我设置的public var的值来更改标签的文本。
override func viewDidLoad() {
super.viewDidLoad()
gameOutcomeLabel.text = gameOutcomeText
}
感谢任何人的支持！