XCode6/Swift: selettore non riconosciuto inviato all'istanza

Question

Ho pensato di provare lo sviluppo iOS dall'annuncio Swift/ios8 e ho difficoltà a creare un TableView di base da compilare.

Attualmente ottenendo i seguenti messaggi di errore quando si carica l'applicazione nel simulatore (Xcode dice costruire Completa):

2014-06-11 13:40:56.173 firstapp[2217:85843] -[UIViewController tableView:numberOfRowsInSection:]: unrecognized selector sent to instance 0xb20fcf0 
2014-06-11 13:40:56.180 firstapp[2217:85843] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[UIViewController tableView:numberOfRowsInSection:]: unrecognized selector sent to instance 0xb20fcf0' 
*** First throw call stack: 
(
    0 CoreFoundation      0x00452916 __exceptionPreprocess + 182 
    1 libobjc.A.dylib      0x01da28d9 objc_exception_throw + 44 
    2 CoreFoundation      0x004596f5 -[NSObject(NSObject) doesNotRecognizeSelector:] + 277 
    3 CoreFoundation      0x003a4857 ___forwarding___ + 1047 
    4 CoreFoundation      0x003a441e _CF_forwarding_prep_0 + 14 
    5 UIKit        0x00f149aa -[UISectionRowData refreshWithSection:tableView:tableViewRowData:] + 2767 
    6 UIKit        0x00f18ebc -[UITableViewRowData numberOfRows] + 98 
    7 UIKit        0x00d57bb0 -[UITableView noteNumberOfRowsChanged] + 133 
    8 UIKit        0x00d57442 -[UITableView reloadData] + 1055 
    9 UIKit        0x00d5b54d -[UITableView _reloadDataIfNeeded] + 78 
    10 UIKit        0x00d60ed5 -[UITableView layoutSubviews] + 36 
    11 UIKit        0x00cd9223 -[UIView(CALayerDelegate) layoutSublayersOfLayer:] + 601 
    12 libobjc.A.dylib      0x01db5763 -[NSObject performSelector:withObject:] + 70 
    13 QuartzCore       0x04441b87 -[CALayer layoutSublayers] + 152 
    14 QuartzCore       0x044359e9 _ZN2CA5Layer16layout_if_neededEPNS_11TransactionE + 397 
    15 QuartzCore       0x04441ace -[CALayer layoutIfNeeded] + 160 
    16 UIKit        0x00db72e3 -[UIViewController window:setupWithInterfaceOrientation:] + 309 
    17 UIKit        0x00ca5a80 -[UIWindow _rotateToBounds:withAnimator:transitionContext:] + 667 
    18 UIKit        0x00ca8388 -[UIWindow _rotateWindowToOrientation:updateStatusBar:duration:skipCallbacks:] + 2151 
    19 UIKit        0x00caa074 -[UIWindow _setRotatableClient:toOrientation:applyTransformToWindow:updateStatusBar:duration:force:isRotating:] + 6723 
    20 UIKit        0x00ca785d -[UIWindow _setRotatableClient:toOrientation:updateStatusBar:duration:force:isRotating:] + 128 
    21 UIKit        0x00ca77d6 -[UIWindow _setRotatableClient:toOrientation:updateStatusBar:duration:force:] + 84 
    22 UIKit        0x00ca769e -[UIWindow _setRotatableViewOrientation:updateStatusBar:duration:force:] + 115 
    23 UIKit        0x00ca7729 -[UIWindow _setRotatableViewOrientation:duration:force:] + 68 
    24 UIKit        0x00ca66b6 __57-[UIWindow _updateToInterfaceOrientation:duration:force:]_block_invoke + 120 
    25 UIKit        0x00ca6624 -[UIWindow _updateToInterfaceOrientation:duration:force:] + 406 
    26 UIKit        0x00ca7445 -[UIWindow setAutorotates:forceUpdateInterfaceOrientation:] + 905 
    27 UIKit        0x00cacb1f -[UIWindow setDelegate:] + 479 
    28 UIKit        0x00da4177 -[UIViewController _tryBecomeRootViewControllerInWindow:] + 184 
    29 UIKit        0x00c9f69a -[UIWindow addRootViewControllerViewIfPossible] + 683 
    30 UIKit        0x00c9f85c -[UIWindow _setHidden:forced:] + 313 
    31 UIKit        0x00c9fad9 -[UIWindow _orderFrontWithoutMakingKey] + 49 
    32 UIKit        0x00cae47b -[UIWindow makeKeyAndVisible] + 80 
    33 UIKit        0x00c4fa50 -[UIApplication _callInitializationDelegatesForMainScene:transitionContext:] + 3228 
    34 UIKit        0x00c528a3 -[UIApplication _runWithMainScene:transitionContext:completion:] + 1507 
    35 UIKit        0x00c6c335 __84-[UIApplication _handleApplicationActivationWithScene:transitionContext:completion:]_block_invoke + 59 
    36 UIKit        0x00c515e3 -[UIApplication workspaceDidEndTransaction:] + 29 
    37 FrontBoardServices     0x033f42af -[FBSWorkspace clientEndTransaction:] + 87 
    38 FrontBoardServices     0x033fb71d __53-[FBSWorkspaceClient _queue_handleTransactionBookEnd]_block_invoke + 49 
    39 CoreFoundation      0x003772f0 __CFRUNLOOP_IS_CALLING_OUT_TO_A_BLOCK__ + 16 
    40 CoreFoundation      0x0036ba83 __CFRunLoopDoBlocks + 195 
    41 CoreFoundation      0x0036b1e8 __CFRunLoopRun + 936 
    42 CoreFoundation      0x0036ab7b CFRunLoopRunSpecific + 443 
    43 CoreFoundation      0x0036a9ab CFRunLoopRunInMode + 123 
    44 UIKit        0x00c50efa -[UIApplication _run] + 571 
    45 UIKit        0x00c54dee UIApplicationMain + 3727 
    46 firstapp       0x00005011 top_level_code + 97 
    47 firstapp       0x0000504b main + 43 
    48 libdyld.dylib      0x022beac5 start + 1 
    49 ???         0x00000001 0x0 + 1 
) 
libc++abi.dylib: terminating with uncaught exception of type NSException 
(lldb) 

Ho provato seguendo la traccia di stack al metodo presumibilmente la causa del problema, ma può' t trovare qualcosa fuori dall'ordinario (attualmente seguendo un tutorial). Ho anche incluso il mio ViewController.swift:

import UIKit 

class ViewController: UIViewController, UITableViewDataSource, UITableViewDelegate { 

    override func viewDidLoad() { 
     super.viewDidLoad() 
     // Do any additional setup after loading the view, typically from a nib. 
    } 

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

    func tableView(tableView: UITableView!, numberOfRowsInSection section: Int) -> Int { 
     return 10 
    } 


    func tableView(tableView: UITableView!, cellForRowAtIndexPath indexPath: NSIndexPath!) -> UITableViewCell! { 
     let cell: UITableViewCell = UITableViewCell(style: UITableViewCellStyle.Subtitle, reuseIdentifier: "MyTestCell") 

     cell.text = "Row #\(indexPath.row)" 
     cell.detailTextLabel.text = "Subtitle #\(indexPath.row)" 

     return cell 
    } 

} 

EDIT: Compreso fonte per Main.storyboard:

<?xml version="1.0" encoding="UTF-8" standalone="no"?> <document type="com.apple.InterfaceBuilder3.CocoaTouch.Storyboard.XIB" version="3.0" toolsVersion="6154.17" systemVersion="13D65" targetRuntime="iOS.CocoaTouch" propertyAccessControl="none" initialViewController="CLE-J8-Gwc"> 
    <dependencies> 
     <plugIn identifier="com.apple.InterfaceBuilder.IBCocoaTouchPlugin" version="6153.11"/> 
    </dependencies> 
    <scenes> 
     <!--View Controller--> 
     <scene sceneID="53f-Xy-Vbi"> 
      <objects> 
       <viewController id="CLE-J8-Gwc" sceneMemberID="viewController"> 
        <view key="view" contentMode="scaleToFill" id="uoO-21-5Iu"> 
         <rect key="frame" x="0.0" y="0.0" width="320" height="568"/> 
         <autoresizingMask key="autoresizingMask" widthSizable="YES" heightSizable="YES"/> 
         <subviews> 
          <tableView clipsSubviews="YES" contentMode="scaleToFill" alwaysBounceVertical="YES" dataMode="prototypes" style="plain" separatorStyle="default" rowHeight="44" sectionHeaderHeight="22" sectionFooterHeight="22" id="Kl0-es-OXb"> 
           <rect key="frame" x="0.0" y="0.0" width="320" height="568"/> 
           <autoresizingMask key="autoresizingMask" widthSizable="YES" heightSizable="YES"/> 
           <color key="backgroundColor" white="1" alpha="1" colorSpace="calibratedWhite"/> 
           <connections> 
            <outlet property="dataSource" destination="CLE-J8-Gwc" id="HG5-Ye-UOQ"/> 
            <outlet property="delegate" destination="CLE-J8-Gwc" id="I76-0E-fPy"/> 
           </connections> 
          </tableView> 
         </subviews> 
         <color key="backgroundColor" white="1" alpha="1" colorSpace="calibratedWhite"/> 
        </view> 
       </viewController> 
       <placeholder placeholderIdentifier="IBFirstResponder" id="yaa-zI-5Eu" userLabel="First Responder" sceneMemberID="firstResponder"/> 
      </objects> 
      <point key="canvasLocation" x="110.66666666666666" y="562.08333333333337"/> 
     </scene> 
    </scenes> 
    <simulatedMetricsContainer key="defaultSimulatedMetrics"> 
     <simulatedStatusBarMetrics key="statusBar"/> 
     <simulatedOrientationMetrics key="orientation"/> 
     <simulatedScreenMetrics key="destination" type="retina4"/> 
    </simulatedMetricsContainer> </document> 

ho controllato un sacco di domande riguardanti lo stesso errore e non riesco a trova qualcosa di specifico o qualsiasi cosa risolva il mio problema attuale.

Grazie!

Answer 1

Come indicato nella prima riga del dump, si sta tentando di inviare ...numberOfRows... a un oggetto della classe UIViewController ma tale metodo è implementato solo nella sottoclasse.

Nel file del pennino è necessario modificare la classe del controller della vista da UIViewController (impostazione predefinita) a ViewController.

Apri il tuo storyboard (o file NIB) selezionare il controller stesso (che ha un icona in basso (o in alto in Xcode 6) che dirà "View Controller" quando il mouse su di esso.

Quindi selezionare la terza icona dal pannello delle proprietà e fino in alto dove si dice "classe personalizzata" enter "ViewController"

Answer 2

Sembra che la fonte di dati della vostra tabella non è impostato per la classe ViewController:

-[UIViewController tableView:numberOfRowsInSection:]: unrecognized selector sent to instance 0xb20fcf0 

Doppio controllo per assicurarsi di aver impostato il file XIB/Storyboard correttamente.

Answer 3

modificare il codice per:

override func tableView(tableView: UITableView?, numberOfRowsInSection section: Int) -> Int { 

    // Return the number of rows in the section. 
    return 10 
}