– ：无法识别的select器发送到实例0x7490da0'
我知道错误发生在这条线上，因为应用程序工作得很好，这条线被注释掉了：
controller.managedObjectContext = self.managedObjectContext; 错误是：
终止应用程序，由于未捕获的exception'NSInvalidArgumentException'，原因：' – [UITableViewController setManagedObjectContext：]：无法识别的select发送到实例0x7490da0'
fibroMappAppDelegate.h
// // fibroMappAppDelegate.h // fibromapp // // Created by jamie mcallister on 09/08/2013. // Copyright (c) 2013 Jamie McAllister. All rights reserved. // #import <UIKit/UIKit.h> @interface fibroMappAppDelegate : UIResponder <UIApplicationDelegate> @property (strong, nonatomic) UIWindow *window; @property (readonly, strong, nonatomic) NSManagedObjectContext *managedObjectContext; @property (readonly, strong, nonatomic) NSManagedObjectModel *managedObjectModel; @property (readonly, strong, nonatomic) NSPersistentStoreCoordinator *persistentStoreCoordinator; - (void)saveContext; - (NSURL *)applicationDocumentsDirectory; @end
和fibroMappAppDelegate.m
// // fibroMappAppDelegate.m // fibromapp // // Created by jamie mcallister on 09/08/2013. // Copyright (c) 2013 Jamie McAllister. All rights reserved. // #import "fibroMappAppDelegate.h" #import "fibroMappMasterViewController.h" @implementation fibroMappAppDelegate @synthesize managedObjectContext = _managedObjectContext; @synthesize managedObjectModel = _managedObjectModel; @synthesize persistentStoreCoordinator = _persistentStoreCoordinator; - (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions { // Override point for customization after application launch. UINavigationController *navigationController = (UINavigationController *)self.window.rootViewController; fibroMappMasterViewController *controller = (fibroMappMasterViewController *)navigationController.topViewController; controller.managedObjectContext = self.managedObjectContext; return YES; } - (void)applicationWillTerminate:(UIApplication *)application { // Saves changes in the application's managed object context before the application terminates. [self saveContext]; } - (void)saveContext { NSError *error = nil; NSManagedObjectContext *managedObjectContext = self.managedObjectContext; if (managedObjectContext != nil) { if ([managedObjectContext hasChanges] && ![managedObjectContext save:&error]) { // Replace this implementation with code to handle the error appropriately. // abort() causes the application to generate a crash log and terminate. You should not use this function in a shipping application, although it may be useful during development. NSLog(@"Unresolved error %@, %@", error, [error userInfo]); abort(); } } } #pragma mark - Core Data stack // Returns the managed object context for the application. // If the context doesn't already exist, it is created and bound to the persistent store coordinator for the application. - (NSManagedObjectContext *)managedObjectContext { if (_managedObjectContext != nil) { return _managedObjectContext; } NSPersistentStoreCoordinator *coordinator = [self persistentStoreCoordinator]; if (coordinator != nil) { _managedObjectContext = [[NSManagedObjectContext alloc] init]; [_managedObjectContext setPersistentStoreCoordinator:coordinator]; } return _managedObjectContext; } // Returns the managed object model for the application. // If the model doesn't already exist, it is created from the application's model. - (NSManagedObjectModel *)managedObjectModel { if (_managedObjectModel != nil) { return _managedObjectModel; } NSURL *modelURL = [[NSBundle mainBundle] URLForResource:@"fibromapp" withExtension:@"momd"]; _managedObjectModel = [[NSManagedObjectModel alloc] initWithContentsOfURL:modelURL]; return _managedObjectModel; } // Returns the persistent store coordinator for the application. // If the coordinator doesn't already exist, it is created and the application's store added to it. - (NSPersistentStoreCoordinator *)persistentStoreCoordinator { if (_persistentStoreCoordinator != nil) { return _persistentStoreCoordinator; } NSURL *storeURL = [[self applicationDocumentsDirectory] URLByAppendingPathComponent:@"fibromapp.sqlite"]; NSError *error = nil; _persistentStoreCoordinator = [[NSPersistentStoreCoordinator alloc] initWithManagedObjectModel:[self managedObjectModel]]; if (![_persistentStoreCoordinator addPersistentStoreWithType:NSSQLiteStoreType configuration:nil URL:storeURL options:nil error:&error]) { /* Replace this implementation with code to handle the error appropriately. abort() causes the application to generate a crash log and terminate. You should not use this function in a shipping application, although it may be useful during development. Typical reasons for an error here include: * The persistent store is not accessible; * The schema for the persistent store is incompatible with current managed object model. Check the error message to determine what the actual problem was. If the persistent store is not accessible, there is typically something wrong with the file path. Often, a file URL is pointing into the application's resources directory instead of a writeable directory. If you encounter schema incompatibility errors during development, you can reduce their frequency by: * Simply deleting the existing store: [[NSFileManager defaultManager] removeItemAtURL:storeURL error:nil] * Performing automatic lightweight migration by passing the following dictionary as the options parameter: @{NSMigratePersistentStoresAutomaticallyOption:@YES, NSInferMappingModelAutomaticallyOption:@YES} Lightweight migration will only work for a limited set of schema changes; consult "Core Data Model Versioning and Data Migration Programming Guide" for details. */ NSLog(@"Unresolved error %@, %@", error, [error userInfo]); abort(); } return _persistentStoreCoordinator; } #pragma mark - Application's Documents directory // Returns the URL to the application's Documents directory. - (NSURL *)applicationDocumentsDirectory { return [[[NSFileManager defaultManager] URLsForDirectory:NSDocumentDirectory inDomains:NSUserDomainMask] lastObject]; } @end
这意味着当你这样做的时候：
controller.managedObjectContext = self.managedObjectContext;
controller没有managedObjectContext属性，所以不可能给它分配任何东西。 你没有发布controller的代码，所以我不知道它是什么样的，但是错误消息说这是一个UITableViewController 。 如果你想以正确的方式解决这个问题，你需要给controller一个managedObjectContext属性，这样你就可以使这个任务成为可能。
你所要做的就是删除这一行：
controller.managedObjectContext = self.managedObjectContext;
而且，无论何时在视图中需要托pipe对象上下文，请使用：
[(fibroMappAppDelegate *)[[UIApplication sharedApplication] delegate] managedObjectContext];
该错误表明您使用的是非子类UITableViewController，并且认为您使用的是具有名为managedObjectContext的属性的子类。 检查你的故事板，xib或代码，看看发生了什么。
因为你正在尝试使用dependency injection（一个很好的东西btw），那么我会build议检查你在哪里创buildcontroller并改变它，以便它使用具有正确属性的UITableViewController的子类。