我在xCode 6上使用了一次轻扫手势（使用Swift）。它运作良好。
@IBAction func ArrasteiDireita(sender: UISwipeGestureRecognizer) {
println("Arrastei Direita")
}
我删除了手势（在main.storyboard中）并尝试使用Pan Gesture，但我不知道为什么仍需要滑动手势。
如果注释了关联的方法（上面的ArrasteiDireita），我收到以下错误：
2014-07-05 10:48:51.400 Verdadeiro ou Falso[51178:2926619] - [_TtC19Verdadeiro_ou_Falso4Jogo ArrasteiDireita:]: unrecognized selector sent to instance 0xb23bfa0
2014-07-05 10:48:51.402 Verdadeiro ou Falso[51178:2926619] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[_TtC19Verdadeiro_ou_Falso4Jogo ArrasteiDireita:]: unrecognized selector sent to instance 0xb23bfa0'
*** First throw call stack:
(
0 CoreFoundation 0x00842646 __exceptionPreprocess + 182
1 libobjc.A.dylib 0x0216d8e3 objc_exception_throw + 44
2 CoreFoundation 0x00849575 -[NSObject(NSObject) doesNotRecognizeSelector:] + 277
3 CoreFoundation 0x00794407 ___forwarding___ + 1047
4 CoreFoundation 0x00793fce _CF_forwarding_prep_0 + 14
5 UIKit 0x01466e63 _UIGestureRecognizerSendActions + 327
6 UIKit 0x0146509c -[UIGestureRecognizer _updateGestureWithEvent:buttonEvent:] + 1657
7 UIKit 0x0146772d -[UIGestureRecognizer _delayedUpdateGesture] + 60
8 UIKit 0x0146b1cc ___UIGestureRecognizerUpdate_block_invoke689 + 347
9 UIKit 0x0146af6d _UIGestureRecognizerRemoveObjectsFromArrayAndApplyBlocks + 317
10 UIKit 0x0145e0a8 _UIGestureRecognizerUpdate + 3786
11 UIKit 0x0108ff3b -[UIWindow _sendGesturesForEvent:] + 1356
12 UIKit 0x01090d9f -[UIWindow sendEvent:] + 769
13 UIKit 0x01056c29 -[UIApplication sendEvent:] + 242
14 UIKit 0x010665e2 _UIApplicationHandleEventFromQueueEvent + 20518
15 UIKit 0x0103bcc5 _UIApplicationHandleEventQueue + 2154
16 CoreFoundation 0x00766faf __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION__ + 15
17 CoreFoundation 0x0075c34d __CFRunLoopDoSources0 + 253
18 CoreFoundation 0x0075b8a8 __CFRunLoopRun + 952
19 CoreFoundation 0x0075b22b CFRunLoopRunSpecific + 443
20 CoreFoundation 0x0075b05b CFRunLoopRunInMode + 123
21 GraphicsServices 0x0417e3ca GSEventRunModal + 192
22 GraphicsServices 0x0417e207 GSEventRun + 104
23 UIKit 0x0103f6e5 UIApplicationMain + 1526
24 Verdadeiro ou Falso 0x0000d591 top_level_code + 97
25 Verdadeiro ou Falso 0x0000d5cb main + 43
26 libdyld.dylib 0x026aeac9 start + 1
)
libc++abi.dylib: terminating with uncaught exception of type NSException
(lldb)
由于滑动手势发生在Pan Gesture之前，我无法达到Pan Gesture方法：
@IBAction func Arrastei(sender: UIPanGestureRecognizer) {
println("Arrastado")
}
我需要删除Swipe Gesture的引用吗？