18549
11197
編輯:有人建議這是另一個問題的重複。不是我已經實現:
-(NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)部分//(當然要很快)。
在ViewController中,我以編程方式創建一個tableView並將其添加為子視圖。我有一個名為DataSource的類,它通過兩個擴展名採用UITableViewDelegate和UITableViewDataSource。
我正在按照這裡給出的示例
我收到一個錯誤:
ViewController tableView:numberOfRowsInSection:]:無法識別的選擇器已發送到實例0x7f88cc406ac0'
0x7f88cc406ac0是包含的ViewController的地址。
即使我使包含的ViewController通過擴展採用UITableViewDelegate,然後調用tableView:numberOfRowsInSection的DataSource實現,我仍然會看到錯誤。
有想法嗎?
導入UIKit
類GenericDataSource:NSObject {
讓標識符=“單元格”
var陣列:[任何] = [“狗”,“貓”,“小鼠”]
func registerCells(forTableView tableView:UITableView){
tableView.register(UITableViewCell.self,forCellReuseIdentifier:標識符)
// tableView.register(UINib(nibName:“”,bundle:nil),forCellReuseIdentifier:標識符)
}
func loadCell(atIndexPath indexPath:IndexPath,forTableView tableView:UITableView)-> UITableViewCell {
// let cell = tableView.dequeueReusableCell(withIdentifier:identifier,for:indexPath)
let cell:UITableViewCell = UITableViewCell(style:UITableViewCellStyle.subtitle,reuseIdentifier:“ cell”)
cell.textLabel!.text =數組[indexPath.row]如?串
返回單元
}
}
// UITableViewDataSource
擴展名GenericDataSource:UITableViewDataSource {
func numberOfSections(在tableView中:UITableView)-> Int {
返回0
}
func tableView(_ tableView:UITableView,numberOfRowsInSection部分:Int)-> Int {
返回array.count
}
func tableView(_ tableView:UITableView,cellForRowAt indexPath:IndexPath)-> UITableViewCell {
返回self.loadCell(atIndexPath:indexPath,forTableView:tableView)
}
}
// UITableViewDelegate
擴展名GenericDataSource:UITableViewDelegate {
func tableView(_ tableView:UITableView,EstimateHeightForRowAt indexPath:IndexPath)-> CGFloat {
返回UITableViewAutomaticDimension
}
func tableView(_ tableView:UITableView,heightForRowAt indexPath:IndexPath)-> CGFloat {
返回UITableViewAutomaticDimension
}
func tableView(_ tableView:UITableView,didSelectRowAt indexPath:IndexPath){
}
}
協議GenericDataSourceDelegate:類{
//委託回調方法
}
擴展ViewController:UITableViewDelegate {
func numberOfSections(在tableView中:UITableView)-> Int {
返回self.dataSource.numberOfSections(in:tableView)
}
func tableView(_ tableView:UITableView,numberOfRowsInSection部分:Int)-> Int {
返回dataSource.tableView(tableView,numberOfRowsInSection:section)
}
func tableView(_ tableView:UITableView,cellForRowAt indexPath:IndexPath)-> UITableViewCell {
返回dataSource.tableView(tableView,cellForRowAt:indexPath)
}
}
func requestTableView()-> UITableView {
返回UITableView(框架:UIScreen.main.bounds,樣式:UITableViewStyle.plain)
}
類ViewController:UIViewController {
var tableView:UITableView?
var dataSource = GenericDataSource()
覆蓋func viewDidLoad(){
super.viewDidLoad()
tableView = requestTableView()
if(tableView!= nil){
self.tableView!.delegate =自我
self.tableView!.dataSource =數據源
self.view.addSubview(self.tableView!)
}
}
}
根據要求,是完整的錯誤消息:
2018-03-09 08:37:52.479763-0800 Job [3560:6187366]-[Job.ViewController tableView:numberOfRowsInSection:]:無法識別的選擇器已發送到實例0x7f9164c065b0
2018-03-09 08:37:52.623521-0800 Job [3560:6187366] *由於未捕獲的異常'NSInvalidArgumentException'而終止應用程序,原因:'-[Job.ViewController tableView:numberOfRowsInSection:]:無法識別的選擇器已發送至實例0x7f9164c065b0'
*首先拋出調用堆棧:
(
0 CoreFoundation 0x00000001089fc12b異常預處理+ 171
1個libobjc.A.dylib 0x0000000104d08f41 objc_exception_throw + 48
2 CoreFoundation 0x0000000108a7d024-[NSObject(NSObject)didNotRecognizeSelector:] + 132
3 UIKit 0x00000001057d8f51-[UIResponder didNotRecognizeSelector:] + 295
4 CoreFoundation 0x000000010897ef78 ___forwarding_ + 1432
5 CoreFoundation 0x000000010897e958 _CF_forwarding_prep_0 + 120
6 UIKit 0x0000000105713b4c-[UITableView _numberOfRowsInSection:] + 62
7 UIKit 0x00000001059c60e1-[UISectionRowData refreshWithSection:tableView:tableViewRowData:] + 2389
8 UIKit 0x00000001059cc5ab-[UITableViewRowData rectForFooterInSection:heightCanBeGuessed:] + 487
9個UIKit0x00000001059cc711-[UITableViewRowData heightForTable] + 61
10 UIKit 0x00000001056c1a65-[UITableView _updateContentSize] + 372
11 UIKit 0x00000001056f267d-[UITableView _rebuildGeometry] + 66
12 UIKit 0x00000001056f003c-[UITableView didMoveToWindow] + 145
13 UIKit 0x000000010566d147-[UIView(Internal)_didMoveFromWindow:toWindow:] + 1748
14 UIKit 0x0000000105686a81-[UIScrollView _didMoveFromWindow:toWindow:] + 84
15 UIKit 0x000000010565f1e1 45- [UIView(Hierarchy)_postMovedFromSuperview:] _ block_invoke + 151
16 UIKit 0x000000010565f0c8-[UIView(Hierarchy)_postMovedFromSuperview:] + 828
17 UIKit 0x000000010566fcbd-[UIView(Internal)_addSubview:positioned:relativeTo:] + 1973
18 UIKit 0x0000000105618aa2-[UIWindow addRootViewControllerViewIfPossible] + 845
19 UIKit 0x0000000105618ed7-[UIWindow setHidden:forced:] + 294
20 UIKit 0x000000010562be54-[UIWindow makeKeyAndVisible] + 42
21 UIKit 0x000000010559e8b8-[UIApplication _callInitializationDelegatesForMainScene:transitionContext:] + 4737
22 UIKit 0x00000001055a3aeb-[UIApplication _runWithMainScene:transitionContext:completion:] + 1720
23 UIKit 0x000000010596d6f8 __111-[__ UICanvasLifecycleMonitor_Compatability _scheduleFirstCommitForScene:transition:firstActivation:completion:] _ block_invoke + 924
24 UIKit 0x0000000105d434c8 + [_ UICanvas _enqueuePostSettingUpdateTransactionBlock:] + 153
25 UIKit 0x000000010596d2f1-[__ UICanvasLifecycleMonitor_Compatability _scheduleFirstCommitForScene:transition:firstActivation:completion:] + 249
26 UIKit 0x000000010596db6b-[__ UICanvasLifecycleMonitor_Compatability activateEventsOnly:withContext:completion:] + 696
27 UIKit 0x00000001062eba69 __82-[_ UIApplicationCanvas _transitionLifecycleStateWithTransitionContext:completion:] _ block_invoke + 262
28 UIKit 0x00000001062eb922-[_ UIApplicationCanvas _transitionLifecycleStateWithTransitionContext:completion:] + 444
29 UIKit 0x0000000105fc89c8 __125-[_ UICanvasLifecycleSettingsDiffAction performActionsForCanvas:withUpdatedScene:settingsDiff:fromSettings:transitionContext:] _ block_invoke + 221
30 UIKit 0x00000001061c7b06 _performActionsWithDelayForTransitionContext + 100
31 UIKit 0x0000000105fc888b-[_ UICanvasLifecycleSettingsDiffAction performActionsForCanvas:withUpdatedScene:settingsDiff:fromSettings:transitionContext:] + 231
32 UIKit 0x0000000105d42b25-[_ UICanvas場景:didUpdateWithDiff:transitionContext:完成:] + 392
33 UIKit 0x00000001055a236a-[UIApplication工作區:didCreateScene:withTransitionContext:完成:] + 523
34 UIKit 0x0000000105b7d605-[UIApplicationSceneClientAgent場景:didInitializeWithEvent:完成:] + 369
35 FrontBoardServices 0x000000010a8bfcc0-[FBSSceneImpl _didCreateWithTransitionContext:completion:] + 338
36 FrontBoardServices 0x000000010a8c87b5 __56- [FBSWorkspace客戶端:handleCreateScene:withCompletion:] _ block_invoke_2 + 235
37 libdispatch.dylib 0x0000000109b1e33d _dispatch_client_callout + 8
38 libdispatch.dylib 0x0000000109b239f3 _dispatch_block_invoke_direct + 592
39 FrontBoardServices 0x000000010a8f4498 __FBSSERIALQUEUE_IS_CALLING_OUT_TO_A_BLOCK + 24
40 FrontBoardServices 0x000000010a8f414e-[FBSSerialQueue _performNext] + 464
41 FrontBoardServices 0x000000010a8f46bd-[FBSSerialQueue _performNextFromRunLoopSource] + 45
42 CoreFoundation 0x000000010899f101 CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION + 17
43 CoreFoundation 0x0000000108a3ef71 __CFRunLoopDoSource0 + 81
44 CoreFoundation 0x0000000108983a19 __CFRunLoopDoSources0 + 185
45 CoreFoundation 0x0000000108982fff __CFRunLoopRun + 1279
46 CoreFoundation 0x0000000108982889 CFRunLoopRunSpecific + 409
47圖形服務0x000000010b1889c6 GSEventRunModal + 62
48個UIKit 0x00000001055a55d6 UIApplicationMain + 159
49約伯0x00000001043ee5e7主+ 55
50 libdyld.dylib0x0000000109b9ad81開始+ 1
51 ??? 0x0000000000000001 0x0 + 1
)
libc ++ abi.dylib:以類型為NSException的未捕獲異常終止
(lldb) 
在Apple文檔中,tableView numberOfRowsInSection方法是數據源方法,而不是委託方法。
因此,您需要創建一個新擴展名並將numberOfRowsInSection方法移入其中:
擴展ViewController:UITableViewDataSource {
func tableView(_ tableView:UITableView,numberOfRowsInSection部分:Int)-> Int {
返回dataSource.tableView(tableView,numberOfRowsInSection:section)
}
}
|
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