のlibC++ abi.dylib：タイプNSException（CollectionView）のキャッチされない例外で終了

Question

私はCollectionViewで私のアプリを起動すると：

2016-06-20 20:37:30.640 Projekt A[19055:699202] -[UIViewController collectionView:numberOfItemsInSection:]: unrecognized selector sent to instance 0x7fd1bbfa3ac0 
2016-06-20 20:37:30.748 Projekt A[19055:699202] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[UIViewController collectionView:numberOfItemsInSection:]: unrecognized selector sent to instance 0x7fd1bbfa3ac0' 
*** First throw call stack: 
(
    0 CoreFoundation      0x000000010f8d2d85 __exceptionPreprocess + 165 
    1 libobjc.A.dylib      0x0000000111854deb objc_exception_throw + 48 
    2 CoreFoundation      0x000000010f8dbd3d -[NSObject(NSObject) doesNotRecognizeSelector:] + 205 
    3 CoreFoundation      0x000000010f821cfa ___forwarding___ + 970 
    4 CoreFoundation      0x000000010f8218a8 _CF_forwarding_prep_0 + 120 
    5 UIKit        0x0000000110baa56c -[UICollectionViewData _updateItemCounts] + 492 
    6 UIKit        0x0000000110bad009 -[UICollectionViewData numberOfSections] + 22 
    7 UIKit        0x0000000110b8ef51 -[UICollectionViewFlowLayout _getSizingInfos] + 445 
    8 UIKit        0x0000000110b90c47 -[UICollectionViewFlowLayout _fetchItemsInfoForRect:] + 118 
    9 UIKit        0x0000000110b8a3fd -[UICollectionViewFlowLayout prepareLayout] + 273 
    10 UIKit        0x0000000110baac3d -[UICollectionViewData _prepareToLoadData] + 67 
    11 UIKit        0x0000000110bab411 -[UICollectionViewData validateLayoutInRect:] + 53 
    12 UIKit        0x0000000110b5853a -[UICollectionView layoutSubviews] + 199 
    13 UIKit        0x0000000110393980 -[UIView(CALayerDelegate) layoutSublayersOfLayer:] + 703 
    14 QuartzCore       0x0000000114a4ac00 -[CALayer layoutSublayers] + 146 
    15 QuartzCore       0x0000000114a3f08e _ZN2CA5Layer16layout_if_neededEPNS_11TransactionE + 366 
    16 QuartzCore       0x0000000114a3ef0c _ZN2CA5Layer28layout_and_display_if_neededEPNS_11TransactionE + 24 
    17 QuartzCore       0x0000000114a333c9 _ZN2CA7Context18commit_transactionEPNS_11TransactionE + 277 
    18 QuartzCore       0x0000000114a61086 _ZN2CA11Transaction6commitEv + 486 
    19 UIKit        0x000000011030519b _afterCACommitHandler + 174 
    20 CoreFoundation      0x000000010f7f7c37 __CFRUNLOOP_IS_CALLING_OUT_TO_AN_OBSERVER_CALLBACK_FUNCTION__ + 23 
    21 CoreFoundation      0x000000010f7f7ba7 __CFRunLoopDoObservers + 391 
    22 CoreFoundation      0x000000010f7ed7fb __CFRunLoopRun + 1147 
    23 CoreFoundation      0x000000010f7ed0f8 CFRunLoopRunSpecific + 488 
    24 GraphicsServices     0x000000011607cad2 GSEventRunModal + 161 
    25 UIKit        0x00000001102d8f09 UIApplicationMain + 171 
    26 Projekt A       0x000000010f6e4292 main + 114 
    27 libdyld.dylib      0x000000011238292d start + 1 
    28 ???         0x0000000000000001 0x0 + 1 
) 
libc++abi.dylib: terminating with uncaught exception of type NSException 
(lldb) 

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Answer 1

エラーは、コレクションビューのデータソースが平文の代わりにUIViewControllerに設定されていると言っていますあなたが持っているクラスはを実装しています。

データソースがどのように割り当てられ、どのクラスのオブジェクトであるかを確認します。