UITapGestureRecognizer在多次点击时崩溃
我正在以编程方式将UIImageView添加到UIScrollView并在imageView上添加一个轻击手势。 它恰好4次识别轻敲事件，第四次崩溃时没有任何明确的错误消息。 这是在名为FeaturedListingDetailVC的控制器中
码：
let frame = CGRect(x: 0, y: 0, width: 128, height: 128) _iv = UIImageView(frame: frame) _iv.image = UIImage(named: "no_media") _iv.userInteractionEnabled = true tapGesture = UITapGestureRecognizer(target: self, action: #selector(initImagePopup(_:))) _iv.addGestureRecognizer(tapGesture) _iv.widthAnchor.constraintEqualToConstant(CGFloat.init(128)).active = true _iv.heightAnchor.constraintEqualToConstant(CGFloat.init(128)).active = true hrScroll.addSubview(_iv)
在Tap上调用的函数：
@objc func initImagePopup(gesture: UITapGestureRecognizer) { print("I am tapped!!!") }
此外，我加载目标viewController （即FeaturedListingDetailVC）的方式确实很重要，但我不知道为什么以及如何。 因为当我将目标viewController推入UINavigationViewController ，它会在第一次点击时崩溃，否则当我通过演示viewController初始化目标VC时它会在第4次点击时崩溃。
使用以下代码初始化时第一次点击时崩溃：
let storyboard = UIStoryboard(name: "Post", bundle: nil) let featuredVC = storyboard.instantiateViewControllerWithIdentifier("FeaturedListingDetailVC") as! FeaturedListingDetailVC self.vc?.navigationController!.pushViewController(featuredVC, animated: true)
使用以下代码初始化时第4次崩溃时崩溃：
let storyboard = UIStoryboard(name: "Post", bundle: nil) let featuredVC = storyboard.instantiateViewControllerWithIdentifier("FeaturedListingDetailVC") as! FeaturedListingDetailVC self.vc?.navigationController!.presentViewController(featuredVC, animated: true, completion: nil)
回溯：
* thread #1: tid = 0x78c3e, 0x0000000106365553 UIKit\`-[UIViewController(UIKitManual) release] + 122, queue = 'com.apple.main-thread', stop reason = EXC_BAD_INSTRUCTION (code=EXC_I386_INVOP, subcode=0x0) frame #0: 0x0000000106365553 UIKit\`-[UIViewController(UIKitManual) release] + 122 frame #1: 0xfffffffee7368160 frame #2: 0x0000000105bf72f3 UIKit\`-[UIViewController setChildModalViewController:] + 248 frame #3: 0x0000000105be853e UIKit\`-[UIViewController dealloc] + 1329 frame #4: 0x0000000105f48b31 UIKit\`_UIGestureRecognizerSendTargetActions + 162 frame #5: 0x0000000105f4519a UIKit\`_UIGestureRecognizerSendActions + 162 frame #6: 0x0000000105f43197 UIKit\`-[UIGestureRecognizer _updateGestureWithEvent:buttonEvent:] + 843 frame #7: 0x0000000105f4b655 UIKit\`___UIGestureRecognizerUpdate_block_invoke898 + 79 frame #8: 0x0000000105f4b4f3 UIKit\`_UIGestureRecognizerRemoveObjectsFromArrayAndApplyBlocks + 342 frame #9: 0x0000000105f38e75 UIKit\`_UIGestureRecognizerUpdate + 2634 frame #10: 0x0000000105ac548e UIKit\`-[UIWindow _sendGesturesForEvent:] + 1137 frame #11: 0x0000000105ac66c4 UIKit\`-[UIWindow sendEvent:] + 849 frame #12: 0x0000000105a71dc6 UIKit\`-[UIApplication sendEvent:] + 263 frame #13: 0x0000000105a4b553 UIKit\`_UIApplicationHandleEventQueue + 6660 frame #14: 0x00000001046f2301 CoreFoundation\`__CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION__ + 17 frame #15: 0x00000001046e822c CoreFoundation\`__CFRunLoopDoSources0 + 556 frame #16: 0x00000001046e76e3 CoreFoundation\`__CFRunLoopRun + 867 frame #17: 0x00000001046e70f8 CoreFoundation\`CFRunLoopRunSpecific + 488 frame #18: 0x000000010bf6ead2 GraphicsServices\`GSEventRunModal + 161 frame #19: 0x0000000105a50f09 UIKit\`UIApplicationMain + 171 * frame #20: 0x0000000103e34b22 JaClassified\`main + 114 at AppDelegate.swift:5 frame #21: 0x000000010886b92d libdyld.dylib\`start + 1 frame #22: 0x000000010886b92d libdyld.dylib\`start + 1
听起来很奇怪，我已经测试了很多你的代码，并且没有办法，总是崩溃。
所以我只是尝试更改回调方法的名称：
func didTapOnImagePopup(recognizer: UITapGestureRecognizer) {}
它有效。
我真的不知道为什么，我可以找到任何合理的解释。
我唯一能想到的是应该存在一个名为“initImagePopup”的内部函数..但它很奇怪。
如果有人知道，我真的很好奇真正的解释。