19237
5180
编辑:有人建议这是另一个问题的重复。不是我已经实现:
-(NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)部分//(当然要很快)。
在ViewController中,我以编程方式创建tableView并将其添加为子视图。我有一个名为DataSource的类,它通过两个扩展名采用UITableViewDelegate和UITableViewDataSource。
我正在按照这里给出的示例
我收到一个错误:
ViewController tableView:numberOfRowsInSection:]:无法识别的选择器已发送到实例0x7f88cc406ac0'
0x7f88cc406ac0是包含的ViewController的地址。
即使我通过扩展使包含的ViewController采用UITableViewDelegate,然后调用tableView:numberOfRowsInSection的DataSource实现,我仍然会看到错误。
有想法吗?
导入UIKit
类GenericDataSource:NSObject {
让标识符=“单元格”
var阵列:[任何] = [“狗”,“猫”,“小鼠”]
func registerCells(forTableView tableView:UITableView){
tableView.register(UITableViewCell.self,forCellReuseIdentifier:标识符)
// tableView.register(UINib(nibName:“”,bundle:nil),forCellReuseIdentifier:标识符)
}
func loadCell(atIndexPath indexPath:IndexPath,forTableView tableView:UITableView)-> UITableViewCell {
// let cell = tableView.dequeueReusableCell(withIdentifier:identifier,for:indexPath)
let cell:UITableViewCell = UITableViewCell(style:UITableViewCellStyle.subtitle,redirectIdentifier:“ cell”)
cell.textLabel!.text =数组[indexPath.row]如?串
返回单元
}
}
// UITableViewDataSource
扩展名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
扩展名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){
}
}
协议GenericDataSourceDelegate:类{
//委托回调方法
}
扩展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,样式:UITableViewStyle.plain)
}
类ViewController:UIViewController {
var tableView:UITableView?
var dataSource = GenericDataSource()
覆盖func viewDidLoad(){
super.viewDidLoad()
tableView = requestTableView()
if(tableView!= nil){
self.tableView!.delegate =自我
self.tableView!.dataSource =数据源
self.view.addSubview(self.tableView!)
}
}
}
根据要求,是完整的错误消息:
2018-03-09 08:37:52.479763-0800 Job [3560:6187366]-[Job.ViewController tableView:numberOfRowsInSection:]:无法识别的选择器已发送到实例0x7f9164c065b0
2018-03-09 08:37:52.623521-0800 Job [3560:6187366] *由于未捕获的异常'NSInvalidArgumentException'而终止应用程序,原因:'-[Job.ViewController tableView:numberOfRowsInSection:]:无法识别的选择器已发送至实例0x7f9164c065b0'
*首先抛出调用堆栈:
(
0 CoreFoundation 0x00000001089fc12b异常预处理+ 171
1个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个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(内部)_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场景:didUpdateWithDiff:transitionContext:完成:] + 392
33 UIKit 0x00000001055a236a-[UIApplication工作区:didCreateScene:withTransitionContext:完成:] + 523
34 UIKit 0x0000000105b7d605-[UIApplicationSceneClientAgent场景:didInitializeWithEvent:完成:] + 369
35 FrontBoardServices 0x000000010a8bfcc0-[FBSSceneImpl _didCreateWithTransitionContext:completion:] + 338
36 FrontBoardServices 0x000000010a8c87b5 __56- [FBSWorkspace客户端: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图形服务0x000000010b1889c6 GSEventRunModal + 62
48个UIKit 0x00000001055a55d6 UIApplicationMain + 159
49约伯0x00000001043ee5e7主+ 55
50 libdyld.dylib0x0000000109b9ad81开始+ 1
51 ??? 0x0000000000000001 0x0 + 1
)
libc ++ abi.dylib:以类型为NSException的未捕获异常终止
(lldb) 
在Apple文档中,tableView numberOfRowsInSection方法是数据源方法,而不是委托方法。
因此,您需要创建一个新扩展名并将numberOfRowsInSection方法移入其中:
扩展ViewController:UITableViewDataSource {
func tableView(_ tableView:UITableView,numberOfRowsInSection部分:Int)-> Int {
返回dataSource.tableView(tableView,numberOfRowsInSection:section)
}
}
|
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