テーブルセルを再利用するためのインデックスパスをアサートしない

Question

UITableViewCellとUITextFieldのカスタムを持つUITableViewがあります。

ユーザーがセルをタップしたときにキーボードを表示したいとします。私はこのような何かやってる：

[Assert] no index path for table cell being reused

：

func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) { 

    guard let cell = tableView.dequeueReusableCell(withIdentifier: "FormCell", for: indexPath) as? FormTableViewCell else { 
     return 
    } 

    cell.textField.becomeFirstResponder() 
} 

をしかし、私はiPad上でアプリを実行すると、セルをタップし、「閉じるキー」でキーボードを閉じようと、私はこのエラーを取得します

* thread #1: tid = 0x7f323, 0x00000001021d5cd8 libswiftFoundation.dylib`static Foundation.IndexPath._unconditionallyBridgeFromObjectiveC (Swift.Optional<__ObjC.NSIndexPath>) -> Foundation.IndexPath + 56, queue = 'com.apple.main-thread', stop reason = EXC_BREAKPOINT (code=1, subcode=0x1021d5cd8) 
    * frame #0: 0x00000001021d5cd8 libswiftFoundation.dylib`static Foundation.IndexPath._unconditionallyBridgeFromObjectiveC (Swift.Optional<__ObjC.NSIndexPath>) -> Foundation.IndexPath + 56 
frame #1: 0x00000001010ab9ec PullToDismiss`@objc PullToDismiss.tableView(UITableView, didEndDisplaying : UITableViewCell, forRowAt : IndexPath) ->() + 104 at PullToDismiss+Proxy.swift:0 
frame #2: 0x000000018fb29c9c UIKit`-[UITableView _reuseTableViewCell:withIndexPath:didEndDisplaying:] + 304 
frame #3: 0x000000018fa13b58 UIKit`-[UITableView _setIsAncestorOfFirstResponder:] + 1028 
frame #4: 0x000000018f8bc288 UIKit`+[UIView(Internal) _setIsResponderAncestorOfFirstResponder:startingAtFirstResponder:] + 216 
frame #5: 0x000000018f8bc02c UIKit`-[UIWindow _setFirstResponder:] + 112 
frame #6: 0x000000018fb973bc UIKit`-[UIResponder _setFirstResponder:] + 80 
frame #7: 0x000000018fae6ec0 UIKit`-[UIView _setFirstResponder:] + 92 
frame #8: 0x000000018fb973bc UIKit`-[UIResponder _setFirstResponder:] + 80 
frame #9: 0x000000018fae6ec0 UIKit`-[UIView _setFirstResponder:] + 92 
frame #10: 0x000000018fb973bc UIKit`-[UIResponder _setFirstResponder:] + 80 
frame #11: 0x000000018fb973bc UIKit`-[UIResponder _setFirstResponder:] + 80 
frame #12: 0x000000018fb973bc UIKit`-[UIResponder _setFirstResponder:] + 80 
frame #13: 0x000000018fb973bc UIKit`-[UIResponder _setFirstResponder:] + 80 
frame #14: 0x000000018fae6ec0 UIKit`-[UIView _setFirstResponder:] + 92 
frame #15: 0x000000018fb973bc UIKit`-[UIResponder _setFirstResponder:] + 80 
frame #16: 0x000000018fae6ec0 UIKit`-[UIView _setFirstResponder:] + 92 
frame #17: 0x000000018fb973bc UIKit`-[UIResponder _setFirstResponder:] + 80 
frame #18: 0x000000018fae6ec0 UIKit`-[UIView _setFirstResponder:] + 92 
frame #19: 0x000000018fb973bc UIKit`-[UIResponder _setFirstResponder:] + 80 
frame #20: 0x000000018fae6ec0 UIKit`-[UIView _setFirstResponder:] + 92 
frame #21: 0x000000018fb973bc UIKit`-[UIResponder _setFirstResponder:] + 80 
frame #22: 0x000000018fae6ec0 UIKit`-[UIView _setFirstResponder:] + 92 
frame #23: 0x000000018fb973bc UIKit`-[UIResponder _setFirstResponder:] + 80 
frame #24: 0x000000018fae6ec0 UIKit`-[UIView _setFirstResponder:] + 92 
frame #25: 0x000000018f928ecc UIKit`-[UITextField _resignFirstResponder] + 300 
frame #26: 0x000000018f8ff374 UIKit`-[UIResponder _finishResignFirstResponder] + 296 
frame #27: 0x000000019024d2d0 UIKit`-[UITextField _finishResignFirstResponder] + 52 
frame #28: 0x000000018f8a36d0 UIKit`-[UIResponder resignFirstResponder] + 284 
frame #29: 0x000000018f928bc8 UIKit`-[UITextField resignFirstResponder] + 136 
frame #30: 0x000000018fc25978 UIKit`-[UIKeyboardImpl dismissKeyboard] + 544 
frame #31: 0x000000018f9be760 UIKit`-[UIKeyboardLayoutStar continueFromInternationalActionForTouchUp:withActions:timestamp:interval:didLongPress:prevActions:executionContext:] + 2544 
frame #32: 0x000000018f9bdb7c UIKit`-[UIKeyboardLayoutStar completeSendStringActionForTouchUp:withActions:timestamp:interval:didLongPress:prevActions:executionContext:] + 784 
frame #33: 0x000000018f9b1684 UIKit`-[UIKeyboardLayoutStar completeRetestForTouchUp:timestamp:interval:executionContext:] + 4712 
frame #34: 0x000000018fc3211c UIKit`__45-[UIKeyboardLayout touchUpTaskForTouchState:]_block_invoke + 228 
frame #35: 0x000000018f821b14 UIKit`-[UIKeyboardTaskQueue continueExecutionOnMainThread] + 384 
frame #36: 0x000000018fc31dd0 UIKit`-[UIKeyboardLayout _touchEndedProcessingForTouches:] + 344 
frame #37: 0x000000018f82c0c4 UIKit`-[UIWindow _sendTouchesForEvent:] + 2484 
frame #38: 0x000000018f827328 UIKit`-[UIWindow sendEvent:] + 2988 
frame #39: 0x000000018f7f7da0 UIKit`-[UIApplication sendEvent:] + 340 
frame #40: 0x000000018ffe175c UIKit`__dispatchPreprocessedEventFromEventQueue + 2736 
frame #41: 0x000000018ffdb130 UIKit`__handleEventQueue + 784 
frame #42: 0x00000001898f6b5c CoreFoundation`__CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION__ + 24 
frame #43: 0x00000001898f64a4 CoreFoundation`__CFRunLoopDoSources0 + 524 
frame #44: 0x00000001898f40a4 CoreFoundation`__CFRunLoopRun + 804 
frame #45: 0x00000001898222b8 CoreFoundation`CFRunLoopRunSpecific + 444 
frame #46: 0x000000018b2d6198 GraphicsServices`GSEventRunModal + 180 
frame #47: 0x000000018f8627fc UIKit`-[UIApplication _run] + 684 
frame #48: 0x000000018f85d534 UIKit`UIApplicationMain + 208 
frame #49: 0x00000001003da970 `main + 140 at AppDelegate.swift:15 
frame #50: 0x00000001888055b8 libdyld.dylib`start + 4 

とアプリだけのクラッシュ：

これは私が得た全体の誤差があります。 UITableViewを一番上にスクロールしてもクラッシュします。それをどうやって防ぐのですか？

Answer 1

セルを取得するこのメソッドを試してください、あなたがやっていることは新しいものを作成することです。

if let cell = tableView.cellForRow(at: indexPath) as? FormTableViewCell { 
    cell.becomeFirstResponder 
} else { 
..dostuff 
}