当我使用UISwipeGestureRecognizer时，我得到的线程1：信号SIGABRT

Question

我正好写了代码作为youtube视频教程的培训目的。这是我用同样的错误做的第二个程序。我的iOS模拟器有问题吗？

这里是代码：

import UIKit 

class ViewController: UIViewController { 

@IBOutlet weak var Label: UILabel! 
override func viewDidLoad() { 
    super.viewDidLoad() 
    // Do any additional setup after loading the view, typically from a nib. 

    var leftSwipe = UISwipeGestureRecognizer(target:self,action: Selector("handleSwipes")) 
    var rightSwipe = UISwipeGestureRecognizer(target:self,action: Selector("handleSwipes")) 
    var upSwipe = UISwipeGestureRecognizer(target:self,action: Selector("handleSwipes")) 
    var downSwipe = UISwipeGestureRecognizer(target:self,action: Selector("handleSwipes")) 

    leftSwipe.direction = .Left 
    rightSwipe.direction = .Right 
    upSwipe.direction = .Up 
    downSwipe.direction = .Down 

    view.addGestureRecognizer(leftSwipe) 
    view.addGestureRecognizer(rightSwipe) 
    view.addGestureRecognizer(upSwipe) 
    view.addGestureRecognizer(downSwipe) 


} 

override func didReceiveMemoryWarning() { 
    super.didReceiveMemoryWarning() 
    // Dispose of any resources that can be recreated. 
} 


func handleSwipes(sender:UISwipeGestureRecognizer){ 

    if (sender.direction == .Left){ 
     Label.text = "Left" 
    } 
    if (sender.direction == .Right){ 
     Label.text = "Right" 
    } 
    if (sender.direction == .Up){ 
     Label.text = "Up" 
    } 
    if (sender.direction == .Down){ 
     Label.text = "Down" 
    } 
} 

}

错误是：

2015年8月3日15：13：09.545 SwipeGestures [14088：457164] - [ SwipeGestures.ViewController handleSwipes]：无法识别的选择器发送到实例0x79f92120 2015-08-03 15：13：09.550 SwipeGestures [14088：457164] *终止应用程序由于unca ught 异常 'NSInvalidArgumentException'，原因： ' - [SwipeGestures.ViewController handleSwipes]：发送到实例0x79f92120无法识别选择 ' *第一掷调用堆栈：（0的CoreFoundation 0x002a9466 exceptionPreprocess + 182 1 libobjc.A.dylib
0x01c98a97 objc_exception_throw + 44 2的CoreFoundation
0x002b12c5 - [NSObject的（NSObject的）doesNotRecognizeSelector：] + 277 3
的CoreFoundation 0x001f9bc7 ___forwarding_ + 1047 4的CoreFoundation 0x001f978e _CF_forwarding_prep_0 + 14 5的UIKit 0x00f05057 _UIGestureRecognizer SendActions + 327 6的UIKit
0x00f038d4 - [UIGestureRecognizer _updateGestureWithEvent：buttonEvent：] + 561 7的UIKit 0x00f0591d - [UIGestureRecognizer _delayedUpdateGesture] + 60 8的UIKit 0x00f0929a _UIGestureRecognizerUpdate_block_invoke661 + 57 9
的UIKit 0x00f0915d _UIGestureRecognizerRemoveObjectsFromArrayAndApplyBlocks + 317 10的UIKit 0x00efd066 _UIGestureRecognizerUpdate + 3720 11的UIKit 0x00b14c5b - [一个UIWindow _sendGesturesForEvent：] + 1356 12的UIKit
0x00b15abf - [一个UIWindow的SendEvent：] + 769 13的UIKit
0x00adabb1 - [UIApplication的的SendEvent：] + 242 14的UIKit
0x00aeabf6 _UIApplicationHandleEventFromQueueEvent + 21066 15的UIKit 0x00abebc7 _UIApplicationHandleEventQueue + 2300 16的CoreFoundation
0x001cc98f __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION + 15 17的CoreFoundation 0x001c249d __CFRunLoopDoSources0 + 253 18的CoreFoundation 0x001c19f8 __CFRunLoopRun + 952 19的CoreFoundation
0x001c137b CFRunLoopRunSpecific + 443 20的CoreFoundation
0x001c11ab CFRunLoopRunInMode + 123 21 GraphicsServices
0x0404e2c1 GSEventRunModal + 192 22 GraphicsServices
0x0404e0fe GSEventRun + 104 23 UIKit
个0x00ac29b6 UIApplicationMain + 1526 24 SwipeGestures
0x000c2e1e top_level_code + 78个25 SwipeGestures
0x000c2e5b主+ 43 26 libdyld.dylib
0x02406ac9启动+ 1）的libC++ ABI。dylib：与未捕获 异常类型NSException（LLDB）的终止

Answer 1

添加一个冒号之后方法的名称：

Selector("handleSwipes:")

这是因为handleSwipes在其定义的参数。

Answer 2

下面一个替换你的动作代码，

var leftSwipe = UISwipeGestureRecognizer(target: self, action: "handleSwipes:") 
    var rightSwipe = UISwipeGestureRecognizer(target: self, action: "handleSwipes:") 
    var upSwipe = UISwipeGestureRecognizer(target: self, action: "handleSwipes:") 
    var downSwipe = UISwipeGestureRecognizer(target: self, action: "handleSwipes:") 

Answer 3

尝试分配用于UISwipeGestureRecognizer委托。 e.g：

class ViewController: UIViewController, UIGestureRecognizerDelegate { 

和：

leftSwipe.delegate = self 

并实行：

func gestureRecognizer(gestureRecognizer: UIGestureRecognizer, shouldRecognizeSimultaneouslyWithGestureRecognizer otherGestureRecognizer: UIGestureRecognizer) -> Bool { 
    return true 
} 

如果还是失败，在选择名称添加冒号别人的建议。

如果您使用以下教程：http://www.raywenderlich.com/76020/using-uigesturerecognizer-with-swift-tutorial您还可以阅读，如果您有多个手势识别器，则需要该代表。默认情况下只允许1个。

Answer 4

你忘了添加一个委托：

import UIKit 

    class ViewController: UIViewController, UIGestureRecognizerDelegate {