Question

我正在使用标签栏应用程序，数据库和导航控制中的分段控件（以编程方式）创建一个项目，以显示来自数据库的信息，我在控制台窗口中收到带Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '*** -[__NSArrayM insertObject:atIndex:]: object cannot be nil'的SIGABRT ..

TableViewAppDelegate。

#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

这一行是模棱两可的NSArray * viewControllers = [NSArray arrayWithObjects:AtoZRecipe, RecipesCollection, nil];，因为我看到大多数相关的帖子，如果我删除nil它将缺少哨兵，据我所知，我已经调用了适当的视图控制器。请帮我摆脱这个错误...提前感谢加载：）:)）

Answer 1

实际上你没有将内存分配给数组，这就是你获得NSInvalidArgumentException的原因

试试这个

NSArray * viewControllers = [NSArray arrayWithArray:[self segmentViewControllers]];

NSInvalidArgumentException：[__ NSArrayM insertObject：atIndex：]：对象不能为零

1 个答案: