我收到下面的错误，我不知道我做错了什么。
我猜有无法定位的托管对象，但是... arf ！
*** Terminating app due to uncaught exception 'NSInternalInconsistencyException', reason: '+entityForName: could not locate an NSManagedObjectModel for entity name 'Boxes''
这是我的.m（只有两个主要功能）
- (void)loadCoreData
{
[[NSNotificationCenter defaultCenter] postNotificationName:@"Test" object:self];
context = [app managedObjectContext];
NSError *err;
// GET THE JSON
NSString *urlString = [NSString stringWithFormat:@"http://localhost:8888/json.txt"];
NSData *data = [NSData dataWithContentsOfURL:[NSURL URLWithString:urlString]];
NSMutableArray *json = (NSMutableArray* )[NSJSONSerialization JSONObjectWithData:data options:kNilOptions error:&err];
// FILL THE ENTITY
for (int i = 0; i != 7; i++)
{
Boxes *boxes = [NSEntityDescription insertNewObjectForEntityForName:@"Boxes" inManagedObjectContext:context];
boxes.name = [[[json valueForKey:@"boxesDetail"] objectAtIndex:i] valueForKey:@"name"] ;
boxes.sexe = [[[json valueForKey:@"boxesDetail"] objectAtIndex:i] valueForKey:@"sexe"] ;
boxes.topic = [[[json valueForKey:@"boxesDetail"] objectAtIndex:i] valueForKey:@"topic"] ;
boxes.number = [NSNumber numberWithInt:[[[[json valueForKey:@"boxesDetail"] objectAtIndex:i] valueForKey:@"number"] intValue]];
}
request = [[NSFetchRequest alloc] init];
NSEntityDescription *entity = [NSEntityDescription entityForName:@"Boxes" inManagedObjectContext:context];
[request setEntity:entity];
arrayForPredicate = [context executeFetchRequest:request error:&err];
}
- (void) fillSexArray:(NSString *)sexe
{
// PREDICATE TO GET AN ARRAY OF PRODUCT WITH SEXE EQUAL TO
NSPredicate *sex;
if ([sexe isEqualToString:@"both"])
{
sex = [NSPredicate predicateWithFormat:@"sexe = %@ OR sexe = %@", @"female", @"male"];
}
else
{
sex = [NSPredicate predicateWithFormat:@"sexe = %@", sexe];
}
NSArray *BoxWithSex = [arrayForPredicate filteredArrayUsingPredicate:sex];
NSMutableArray *mutableArray = [self createMutableArray:BoxWithSex];
// NSLog(@"%@", [[mutableArray objectAtIndex:1] valueForKey:@"name"]);
// NSUInteger numObjects = [mutableArray count];
}
我的 .h ：
@interface AddViewController : UIViewController
{
IBOutlet UIButton *male;
IBOutlet UIButton *female;
IBOutlet UIButton *couple;
UIButton *maleBtn;
BOOL flag;
NSArray *arrayForPredicate;
NSFetchedResultsController *fetchedResultsController;
NSManagedObjectContext *context;
NSFetchRequest *request;
}
@property (nonatomic, retain) WonderAppDelegate *app;
- (void) fillSexArray:(NSString *)sexe;
- (NSMutableArray *)createMutableArray:(NSArray *)array;
- (void)loadCoreData;
- (void)sexeButtonPressed;
- (void)sexeArray;
@end
编辑创建 managedObject ：
+ (id)boxWithDictionary:(NSDictionary *)dict withManagedObjectContext:(NSManagedObjectContext *)managedObjectContext;
{
Boxes *boxes = [NSEntityDescription insertNewObjectForEntityForName:@"Boxes"
inManagedObjectContext:managedObjectContext];
boxes.name = [dict objectForKey:@"name"];
boxes.sexe = [dict objectForKey:@"sexe"];
boxes.topic = [dict objectForKey:@"topic"];
boxes.number = [dict objectForKey:@"number"];
return boxes;
}
这是我的 .m，它的工作原理就是这样，但我不想要 Add there 函数的代码，我想要它在 loadCoreData 上。
//
// AddViewController.m
// CoreDataTuto
//
// Created by Clement Yerochewski on 30/04/12.
// Copyright (c) 2012 Weblib. All rights reserved.
//
#import "AddViewController.h"
#import "Boxes.h"
@implementation AddViewController
@synthesize app, context;
- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
if (self) {
UINavigationBar *navBar = [[UINavigationBar alloc] initWithFrame:CGRectMake(0, 0, 768, 44)];
UINavigationItem *navItem = [[UINavigationItem alloc] initWithTitle:@"Add Detail"];
[navBar pushNavigationItem:navItem animated:NO];
UIBarButtonItem *cancelButton = [[UIBarButtonItem alloc] initWithTitle:@"Cancel" style:UIBarButtonItemStylePlain target:self action:@selector(cancel)];
UIBarButtonItem *addButton = [[UIBarButtonItem alloc] initWithTitle:@"Add" style:UIBarButtonItemStyleBordered target:self action:@selector(add)];
navItem.leftBarButtonItem = cancelButton;
navItem.rightBarButtonItem = addButton;
[self.view addSubview:navBar];
app = [[UIApplication sharedApplication] delegate];
}
return self;
}
- (void) add{
[self dismissModalViewControllerAnimated:YES];
// PREDICATE TO GET AN ARRAY OF PRODUCT WITH A LENGTH NAME <= 5
// NSPredicate *length;
// length = [NSPredicate predicateWithFormat:@"name.length <= 5"];
// NSArray *BoxWithCheapPrice = [array filteredArrayUsingPredicate:length];
// NSLog(@"Box %@", BoxWithCheapPrice);
// PREDICATE TO GET AN ARRAY OF PRODUCT WITH PRICE BETWEEN $MIN AND $MAX
// NSNumber *min = [NSNumber numberWithInteger:30];
// NSNumber *max = [NSNumber numberWithInteger:100];
// NSPredicate *between;
// between = [NSPredicate predicateWithFormat:@"number BETWEEN %@", [NSArray arrayWithObjects:min, max, nil]];
// NSArray *BoxWithPriceBetween = [array filteredArrayUsingPredicate:between];
// NSLog(@"Box %@", BoxWithPriceBetween);
// NSLog(@"%@", [BoxWithPriceBetween valueForKey:@"name"]);
}
- (NSMutableArray *)createMutableArray:(NSArray *)array
{
return [NSMutableArray arrayWithArray:array];
}
- (IBAction) sexeChoosen: (id) sender
{
switch ( ((UIButton*)sender).tag ){
case 0:
[self fillSexArray:@"male"];
break;
case 1:
[self fillSexArray:@"female"];
break;
default:
[self fillSexArray:@"both"];
}
[self sexeButtonPressed];
}
- (void)sexeButtonPressed
{
if (flag)
{
UIImage * maleImg2 = [UIImage imageNamed:@"pressed.png"];
[maleBtn setImage:maleImg2 forState:UIControlStateNormal];
flag = NO;
[self sexeArray];
}
else
{
UIImage * maleImg1 = [UIImage imageNamed:@"unpressed.png"];
[maleBtn setImage:maleImg1 forState:UIControlStateNormal];
flag = YES;
[self sexeArray];
}
}
- (void)sexeArray
{
}
- (void)loadCoreData
{
}
- (void) fillSexArray:(NSString *)sexe
{
context = [app managedObjectContext];
// GET THE JSON
NSString *urlString = [NSString stringWithFormat:@"http://localhost:8888/json.txt"];
NSData *data = [NSData dataWithContentsOfURL:[NSURL URLWithString:urlString]];
NSError *err;
NSMutableArray *json = (NSMutableArray* )[NSJSONSerialization JSONObjectWithData:data options:kNilOptions error:&err];
// FILL THE ENTITY
for (int i = 0; i != 7; i++)
{
Boxes *boxes = [NSEntityDescription insertNewObjectForEntityForName:@"Boxes" inManagedObjectContext:context];
boxes.name = [[[json valueForKey:@"boxesDetail"] objectAtIndex:i] valueForKey:@"name"] ;
boxes.sexe = [[[json valueForKey:@"boxesDetail"] objectAtIndex:i] valueForKey:@"sexe"] ;
boxes.topic = [[[json valueForKey:@"boxesDetail"] objectAtIndex:i] valueForKey:@"topic"] ;
boxes.number = [NSNumber numberWithInt:[[[[json valueForKey:@"boxesDetail"] objectAtIndex:i] valueForKey:@"number"] intValue]];
}
NSFetchRequest *request = [[NSFetchRequest alloc] init];
NSEntityDescription *entity = [NSEntityDescription entityForName:@"Boxes" inManagedObjectContext:context];
[request setEntity:entity];
arrayForPredicate = [context executeFetchRequest:request error:&err];
NSPredicate *sex;
// PREDICATE TO GET AN ARRAY OF PRODUCT WITH SEXE EQUAL TO
if ([sexe isEqualToString:@"both"])
{
sex = [NSPredicate predicateWithFormat:@"sexe = %@ OR sexe = %@", @"female", @"male"];
}
else
{
sex = [NSPredicate predicateWithFormat:@"sexe = %@", sexe];
}
NSArray *BoxWithSex = [arrayForPredicate filteredArrayUsingPredicate:sex];
NSMutableArray *mutableArray = [self createMutableArray:BoxWithSex];
NSLog(@"SEXE CHOOSEN %@", mutableArray);
// NSLog(@"%@", [[mutableArray objectAtIndex:1] valueForKey:@"name"]);
NSUInteger numObjects = [mutableArray count];
NSLog(@"%d", numObjects);
}
- (void) cancel{
[self dismissModalViewControllerAnimated:YES];
}
- (void)didReceiveMemoryWarning
{
// Releases the view if it doesn't have a superview.
[super didReceiveMemoryWarning];
// Release any cached data, images, etc that aren't in use.
}
#pragma mark - View lifecycle
- (void)viewDidLoad
{
flag = YES;
maleBtn = [UIButton buttonWithType:UIButtonTypeCustom];
maleBtn.frame = CGRectMake(40, 47, 107, 75);
[maleBtn setTitle:@"male" forState:UIControlStateNormal];
UIImage * maleImg1 = [UIImage imageNamed:@"unpressed.png"];
[maleBtn setImage:maleImg1 forState:UIControlStateNormal];
[maleBtn addTarget:self action:@selector(sexeChoosen:) forControlEvents:UIControlEventTouchUpInside];
[self.view addSubview:maleBtn];
[self loadCoreData];
[super viewDidLoad];
// Do any additional setup after loading the view from its nib.
}
- (void)viewDidUnload
{
[super viewDidUnload];
// Release any retained subviews of the main view.
// e.g. self.myOutlet = nil;
}
- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation
{
// Return YES for supported orientations
return (interfaceOrientation == UIInterfaceOrientationPortrait);
}
@end