Segue sender对象“无法识别的选择器发送到实例”的问题

Question

我正在编写应用程序，我创建了一个MainTableviewVontrolller.h＆amp;带有相应目标文件的MainTableviewVontrolller.m个文件，用于存储名为Youga.h和Youga.m的数据的Json 在上面这个MainTableviewVontrolller.m我要从网络中提取一些数据，这是完美的。现在我要向另一个包含DetailTableViewController.h＆amp;通过DetailTableViewController.m在故事板上Showdetail Segue，这里我要传递一些参数，因为我需要在我的数组中选择那些包含ycategoryName的索引等于早期MainTableviewVontrolller.m所选行的索引路径名{{ 1}}

我正在使用两种不同的网络服务

1. http://yoga.lifehealthinfo.com/api/yoga_list/categories，主键ID和姓名

2. http://yoga.lifehealthinfo.com/api/yoga_list/all，其中包含匹配的关键字类别yougaName和category_id

我想要完成的事情是我愿意从第二个Web服务Json文件中显示所选行的相应数据。 这是我在控制台上遇到的错误。

category_name

现在查看2016-08-10 11:54:07.904 iYouga[622:21074] -[UITableViewController getCategory:]: unrecognized selector sent to instance 0x7fb195808490 2016-08-10 11:54:07.951 iYouga[622:21074] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[UITableViewController getCategory:]: unrecognized selector sent to instance 0x7fb195808490' *** First throw call stack: ( 0 CoreFoundation 0x0000000103933e65 __exceptionPreprocess + 165 1 libobjc.A.dylib 0x00000001033acdeb objc_exception_throw + 48 2 CoreFoundation 0x000000010393c48d -[NSObject(NSObject) doesNotRecognizeSelector:] + 205 3 CoreFoundation 0x000000010388990a ___forwarding___ + 970 4 CoreFoundation 0x00000001038894b8 _CF_forwarding_prep_0 + 120 5 iYouga 0x0000000102ea90bf -[MainTableViewController prepareForSegue:sender:] + 351 6 UIKit 0x0000000104409f01 -[UIStoryboardSegueTemplate _performWithDestinationViewController:sender:] + 369 7 UIKit 0x0000000104409d5f -[UIStoryboardSegueTemplate _perform:] + 82 8 UIKit 0x000000010440a023 -[UIStoryboardSegueTemplate perform:] + 156 9 UIKit 0x0000000103e23cee -[UITableView _selectRowAtIndexPath:animated:scrollPosition:notifyDelegate:] + 1775 10 UIKit 0x0000000103e23fb3 -[UITableView _userSelectRowAtPendingSelectionIndexPath:] + 388 11 UIKit 0x0000000103cec4a2 _runAfterCACommitDeferredBlocks + 317 12 UIKit 0x0000000103cffc01 _cleanUpAfterCAFlushAndRunDeferredBlocks + 95 13 UIKit 0x0000000103d0baf3 _afterCACommitHandler + 90 14 CoreFoundation 0x000000010385f367 __CFRUNLOOP_IS_CALLING_OUT_TO_AN_OBSERVER_CALLBACK_FUNCTION__ + 23 15 CoreFoundation 0x000000010385f2d7 __CFRunLoopDoObservers + 391 16 CoreFoundation 0x0000000103854f2b __CFRunLoopRun + 1147 17 CoreFoundation 0x0000000103854828 CFRunLoopRunSpecific + 488 18 GraphicsServices 0x00000001070f0ad2 GSEventRunModal + 161 19 UIKit 0x0000000103ce0610 UIApplicationMain + 171 20 iYouga 0x0000000102ea98df main + 111 21 libdyld.dylib 0x000000010606f92d start + 1 22 ??? 0x0000000000000001 0x0 + 1 ) libc++abi.dylib: terminating with uncaught exception of type NSException (lldb) 文件

MainTableViewController.m

这是我的#import "MainTableViewController.h" #import "Youga.h" #import "DetailTableViewController.h" #define getDataUrl @"http://yoga.lifehealthinfo.com/api/yoga_list/categories" @interface MainTableViewController () @end @implementation MainTableViewController @synthesize jsonArray, yougaArray; - (void)viewDidLoad { [super viewDidLoad]; [self retrieveData]; } - (void)didReceiveMemoryWarning { [super didReceiveMemoryWarning]; // Dispose of any resources that can be recreated. } #pragma mark - Table view data source - (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView { return 1; } - (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section { return yougaArray.count; } - (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath { UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:@"cell" forIndexPath:indexPath]; Youga * YougaObject; YougaObject = [yougaArray objectAtIndex:indexPath.row]; cell.textLabel.text = YougaObject.yougaName; cell.accessoryType = UITableViewCellAccessoryDisclosureIndicator; // Configure the cell... // Configure the cell... return cell; } #pragma mark - Navigation // In a storyboard-based application, you will often want to do a little preparation before navigation - (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender { if ([[segue identifier] isEqualToString:@"showDetail"]) { NSIndexPath *indexPath = [self.tableView indexPathForSelectedRow]; //get the object for selected row Youga *object = [yougaArray objectAtIndex:indexPath.row]; [[segue destinationViewController] getCategory:object]; }} -(void) retrieveData{ NSURL * url = [NSURL URLWithString:getDataUrl]; NSData * data = [NSData dataWithContentsOfURL:url]; NSDictionary *jsonDict = [NSJSONSerialization JSONObjectWithData:data options:kNilOptions error:nil]; NSDictionary *dataJSON = [jsonDict objectForKey:@"data"]; NSArray *allCategoriesJSON = [dataJSON objectForKey:@"categories"]; yougaArray = [[NSMutableArray alloc] init]; for (int i = 0; i < allCategoriesJSON.count; i ++) { NSDictionary *aCategoryJSON = [allCategoriesJSON objectAtIndex:i]; NSString *yId = [aCategoryJSON objectForKey:@"id"]; NSString *yName = [aCategoryJSON objectForKey:@"name"]; NSString *yDescription = [aCategoryJSON objectForKey:@"description"]; NSString *yImage = [aCategoryJSON objectForKey:@"image"]; [yougaArray addObject:[[Youga alloc] initWithYougaId:yId andYougaName:yName andYougaDescpription:yDescription andYougaImage:yImage]]; } [self.tableView reloadData]; } @end 文件

DetailTableViewController.m

有人能解决这个问题???

Answer 1

问题可能来自你的故事板。您确定正确地将segue目标视图控制器的类更改为自定义DetailTableViewController。似乎故事板实例化了一个经典的UITableViewController而不是你的自定义类，因此无法识别的选择器......

Answer 2

我认为在使用之前你应该引用目标视图控制器，试试这个：

q.setFirstResult(0)
q.setMaxResults(1)
List<Obj> myMcb = q.getResultList();