应用程序在尝试创建数据库时崩溃

我使用“SQLite 数据库浏览器”创建了一个 sql 数据库，将其拖放到我的 Xcode 项目中，并构建了应用程序。它在模拟器上运行良好，但在 iPhone 上崩溃，并出现以下错误：

*** Terminating app due to uncaught exception 'NSInternalInconsistencyException', 
 reason: 'Failed to create writable database file with message 'The operation could‚ 
not be completed. (Cocoa error 260.)'.'   

这是我的代码：

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
    // Creates a writable copy of the bundled default database in the application Documents directory:
    NSLog(@"AppDelegate...Looking for embedded Database file...");
    BOOL success;
    NSFileManager *fileManager = [NSFileManager defaultManager];
    NSError *error;
    // Grab the path to the Documents folder:
    NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
    NSString *documentsDirectory = [paths objectAtIndex:0];
    NSString *writableDBPath = [documentsDirectory stringByAppendingPathComponent:@"users.sql"];

    success = [fileManager fileExistsAtPath:writableDBPath];
    if (success) {
        NSLog(@"Database File Exists in Documents folder!");
        NSLog(@"Its path is: %@", writableDBPath);
        return YES;
    }
    else {
    // But if the writable database does not exist, copy the default to the appropriate location.
    NSLog(@"!!NO Database File Exists in Documents folder!");
    NSString *defaultDBPath = [[[NSBundle mainBundle] resourcePath] stringByAppendingPathComponent:@"users.sql"];
    success = [fileManager copyItemAtPath:defaultDBPath toPath:writableDBPath error:&error];
    if (!success) {
        NSAssert1(0, @"Failed to create writable database file with message '%@'.", [error localizedDescription]);
    }
    else 
        NSLog(@"WROTE THE DATABASE FILE!!!");
}

return YES;
}

同样，这适用于模拟器，但不适用于 iPhone。 （这不可能与具有“.sql”扩展名而不是“.sqlite”扩展名的文件有任何关系，不是吗？因为这是“SQLite 数据库浏览器”为其创建的文件提供的扩展名。 .)

答案与确保 sql 文件的“目标成员资格”设置正确有关，以便项目“看到”它：

1）单击Xco​​de左侧窗格中的sql文件

2）打开/显示文件检查器（右窗格）

3) 在“目标会员资格”下，确保“检查”为“已检查”

就是这样。