ios - NS无效参数异常 : [__NSArrayM insertObject:atIndex:]: object cannot be nil

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我正在创建一个项目，其中包含选项卡栏应用程序、数据库和导航控件中的分段控件(以编程方式)以显示来自数据库的信息，并且我正在获取 SIGABRT 和

 由于未捕获的异常“NSInvalidArgumentException”而终止应用程序，原因: '*** -[__NSArrayM insertObject:atIndex:]: 对象不能为 nil'

在控制台窗口中..

#import "SegmentsController.h" #import "TableViewAppDelegate.h" #import "RootViewController.h" #import "AtoZHomePageViewController.h" #import "CollectionRecipe.h" #import "NSArray+PerformSelector.h" @interface TableViewAppDelegate() - (NSArray *)segmentViewControllers; - (void)firstUserExperience; @end @implementation TableViewAppDelegate @synthesize window; @synthesize navigationController; @synthesize tabbarController; @synthesize recipes; @synthesize segmentsController, segmentedControl; #pragma mark - #pragma mark Application lifecycle - (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions { NSArray * viewControllers = [self segmentViewControllers]; // UINavigationController * navigationController = [[[UINavigationController alloc] init] autorelease]; self.segmentsController = [[SegmentsController alloc] initWithNavigationController:navigationController viewControllers:viewControllers]; self.segmentedControl = [[UISegmentedControl alloc] initWithItems:[viewControllers arrayByPerformingSelector:@selector(title)]]; self.segmentedControl.segmentedControlStyle = UISegmentedControlStyleBar; [self.segmentedControl addTarget:self.segmentsController action:@selector(indexDidChangeForSegmentedControl:) forControlEvents:UIControlEventValueChanged]; databaseName = @"RecipeDatabase.sql"; // Get the path to the documents directory and append the databaseName NSArray *documentPaths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES); NSString *documentsDir = [documentPaths objectAtIndex:0]; databasePath = [documentsDir stringByAppendingPathComponent:databaseName]; // Execute the "checkAndCreateDatabase" function [self checkAndCreateDatabase]; // Query the database for all animal records and construct the "animals" array [self readRecipesFromDatabase]; // Configure and show the window [self firstUserExperience]; [window addSubview:[tabbarController view]]; [window addSubview:[navigationController view]]; [window makeKeyAndVisible]; return YES; } #pragma mark - #pragma mark Segment Content - (NSArray *)segmentViewControllers { UIViewController * AtoZRecipe = [[AtoZHomePage alloc] initWithNibName:@"AtoZRecipeController" bundle:nil]; UIViewController * RecipesCollection = [[CollectionRecipe alloc] initWithNibName:@"RecipeCollection" bundle:nil]; NSArray * viewControllers = [NSArray arrayWithObjects:AtoZRecipe, RecipesCollection, nil]; [AtoZRecipe release]; [RecipesCollection release]; return viewControllers; } - (void)firstUserExperience { self.segmentedControl.selectedSegmentIndex = 0; [self.segmentsController indexDidChangeForSegmentedControl:self.segmentedControl]; } - (void)applicationWillTerminate:(UIApplication *)application { // Save data if appropriate } -(void) checkAndCreateDatabase{ // Check if the SQL database has already been saved to the users phone, if not then copy it over BOOL success; // Create a FileManager object, we will use this to check the status // of the database and to copy it over if required NSFileManager *fileManager = [NSFileManager defaultManager]; // Check if the database has already been created in the users filesystem success = [fileManager fileExistsAtPath:databasePath]; // If the database already exists then return without doing anything if(success) return; // If not then proceed to copy the database from the application to the users filesystem // Get the path to the database in the application package NSString *databasePathFromApp = [[[NSBundle mainBundle] resourcePath] stringByAppendingPathComponent:databaseName]; // Copy the database from the package to the users filesystem [fileManager copyItemAtPath:databasePathFromApp toPath:databasePath error:nil]; } -(void) readRecipesFromDatabase { // Setup the database object sqlite3 *database; // Init the animals Array recipes = [[NSMutableArray alloc] init]; // Open the database from the users filessytem if(sqlite3_open([databasePath UTF8String], &database) == SQLITE_OK) { // Setup the SQL Statement and compile it for faster access const char *sqlStatement = "select * from recipe order by name"; sqlite3_stmt *compiledStatement; if(sqlite3_prepare_v2(database, sqlStatement, -1, &compiledStatement, NULL) == SQLITE_OK) { // Loop through the results and add them to the feeds array while(sqlite3_step(compiledStatement) == SQLITE_ROW) { // Read the data from the result row NSString *aName = [NSString stringWithUTF8String:(char *)sqlite3_column_text(compiledStatement, 1)]; NSString *aAuthor=[NSString stringWithUTF8String:(char *)sqlite3_column_text(compiledStatement,2)]; NSString *aThumbnail=[NSString stringWithUTF8String:(char *)sqlite3_column_text(compiledStatement,3)]; NSString *aPre_time=[NSString stringWithUTF8String:(char *)sqlite3_column_text(compiledStatement,5)]; NSString *aBake_time=[NSString stringWithUTF8String:(char *)sqlite3_column_text(compiledStatement,6)]; NSString *aTota_ltime=[NSString stringWithUTF8String:(char *)sqlite3_column_text(compiledStatement, 7)]; NSString *alarge_image=[NSString stringWithUTF8String:(char *)sqlite3_column_text(compiledStatement,8)]; NSString *asmall_image=[NSString stringWithUTF8String:(char *)sqlite3_column_text(compiledStatement, 9)]; NSString *asummary=[NSString stringWithUTF8String:(char *)sqlite3_column_text(compiledStatement, 10)]; NSString *aServe_size=[NSString stringWithUTF8String:(char *)sqlite3_column_text(compiledStatement,11)]; // Create a new recipe object with the data from the database AtoZHomePage *recipe=[[AtoZHomePage alloc] initWithName:aName author:aAuthor img_thumbnail:aThumbnail pre_Time:aPre_time bake_Time:aBake_time total_time:aTota_ltime large_Img:alarge_image small_Img:asmall_image summary:asummary serve_size:aServe_size]; // Add the recipe object to the recipes Array [recipes addObject:recipe]; [recipe release]; } } // Release the compiled statement from memory sqlite3_finalize(compiledStatement); } sqlite3_close(database); } #pragma mark - #pragma mark Memory management - (void)dealloc { self.segmentedControl = nil; self.segmentsController = nil; [recipes release]; [tabbarController release]; [navigationController release]; [window release]; [super dealloc]; } @end

这一行是不明确的 NSArray * viewControllers = [NSArray arrayWithObjects:AtoZRecipe, RecipesCollection, nil]; 因为我看到了大部分相关的帖子，如果我删除 nil 它将丢失 sentinel 并且根据我已经调用了适当的 View Controller 。请帮我摆脱这个错误...提前致谢:):)

ios - NS无效参数异常 : [__NSArrayM insertObject:atIndex:]: object cannot be nil

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