XCode6 / Swift：无法识别的select器发送到实例

自从Swift / ios8发布以来，我一直试着在iOS开发中尝试一下，并且无法获得基本的tableView。

在模拟器中加载应用程序时，目前收到以下错误消息（Xcode说构build完成）：

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) 

我已经尝试跟踪堆栈跟踪到应该导致问题的方法，但找不到任何不寻常的东西（目前下面的教程）。 我还包括我的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 } } 

编辑：包括Main.storyboard的源代码：

 <?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> 

我已经检查了很多关于同样的错误的问题，似乎无法find任何特定的东西或任何解决我目前的问题。

谢谢！

Answer 1

如转储的第一行所示，您正在尝试将...numberOfRows...发送到类UIViewController的对象，但该方法仅在您的子类中实现。

在你的nib文件中，你需要将你的视图控制器的类从UIViewController （默认）改为ViewController 。

打开你的故事板（或笔尖文件）select控制器本身（它有一个图标在Xcode 6的底部（或顶部），当你将鼠标放在它上面时，将会显示“View Controller”。

然后从属性面板中select第三个图标，在顶部的“Custom Class”中input“ViewController”

Answer 2

看来你的表的数据源没有设置到你的ViewController类：

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

仔细检查，确保已经正确设置了XIB文件/ Storyboard。

Answer 3

将您的代码更改为：

 override func tableView(tableView: UITableView?, numberOfRowsInSection section: Int) -> Int { // Return the number of rows in the section. return 10 }