我正在尝试做什么：获取一个SplitViewController，用于两个相互传递数据的视图控制器之间。我很新，所以请提供任何例子。
错误： 使用线程1：信号SIGBRT
Scan[29101:2468584] Unknown class MainTableView in Interface Builder file.2015-07-17 02:06:59.356 X-Scan[29101:2468584] Registering for keyboard events2015-07-17 02:08:16.944 X-Scan[29101:2468584] Unregister for keyboard events2015-07-17 02:08:16.947 X-Scan[29101:2468584] Unknown class MainTableViewin Interface Builder file.2015-07-17 02:08:16.951 X-Scan[29101:2468584] Registering for keyboard events2015-07-17 02:08:17.769 X-Scan[29101:2468584] Unregister for keyboard events
我认为主要关注的是
*** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '+entityForName: nil is not a legal NSManagedObjectContext parameter searching for entity name 'DPickup''
我尝试了什么： 各种堆栈溢出解决方案，但似乎没有影响它的工作。我已经尝试了 prepareForSegue：sender ，但没有运气。我也尝试过使用delegate和managedObjectContext类，但也没有运气。 （当您尝试调试多年没有文档的代码时很难）。
我的Appdelegate.h代码
#import <UIKit/UIKit.h>
#import "X_ScanAppDelegate.h"
int main(int argc, char *argv[])
{
@autoreleasepool {
return UIApplicationMain(argc, argv, nil, NSStringFromClass([X_ScanAppDelegate class]));
}
}
Appdelgate.m
#import "X_ScanAppDelegate.h"
@implementation X_ScanAppDelegate
@synthesize window = _window;
@synthesize managedObjectContext = _managedObjectContext;
@synthesize managedObjectModel = _managedObjectModel;
@synthesize persistentStoreCoordinator = _persistentStoreCoordinator;
// 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:@"Model" withExtension:@"mom"];
_managedObjectModel = [[NSManagedObjectModel alloc] initWithContentsOfURL:modelURL];
return _managedObjectModel;
}
- (NSManagedObjectContext *)managedObjectContext {
if (_managedObjectContext != nil) {
return _managedObjectContext;
}
NSPersistentStoreCoordinator *coordinator = [self persistentStoreCoordinator];
if (coordinator != nil) {
NSManagedObjectContext* moc = [[NSManagedObjectContext alloc] initWithConcurrencyType:NSMainQueueConcurrencyType];
[moc performBlockAndWait:^{
[moc setPersistentStoreCoordinator: coordinator];
[[NSNotificationCenter defaultCenter]addObserver:self selector:@selector(mergeChangesFrom_iCloud:) name:NSPersistentStoreDidImportUbiquitousContentChangesNotification object:coordinator];
}];
_managedObjectContext = moc;
}
return _managedObjectContext;
}
- (void)mergeChangesFrom_iCloud:(NSNotification *)notification {
NSLog(@"Merging in changes from iCloud...");
NSManagedObjectContext* moc = [self managedObjectContext];
[moc performBlock:^{
[moc mergeChangesFromContextDidSaveNotification:notification];
NSNotification* refreshNotification = [NSNotification notificationWithName:@"SomethingChanged"
object:self
userInfo:[notification userInfo]];
[[NSNotificationCenter defaultCenter] postNotification:refreshNotification];
}];
}
// 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;
}
_persistentStoreCoordinator = [[NSPersistentStoreCoordinator alloc] initWithManagedObjectModel: [self managedObjectModel]];
NSPersistentStoreCoordinator *psc = _persistentStoreCoordinator;
// Set up iCloud in another thread:
dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{
// ** Note: if you adapt this code for your own use, you MUST change this variable:
NSString *iCloudEnabledAppID = @"rentxent";
// ** Note: if you adapt this code for your own use, you should change this variable:
NSString *dataFileName = @"X-Scan.sqlite";
/*
NSURL *storeURL = [[self applicationDocumentsDirectory] URLByAppendingPathComponent:@"X-Scan.sqlite"];*/
// ** Note: For basic usage you shouldn't need to change anything else
NSString *iCloudDataDirectoryName = @"Data.nosync";
NSString *iCloudLogsDirectoryName = @"Logs";
NSFileManager *fileManager = [NSFileManager defaultManager];
NSURL *localStore = [[self applicationDocumentsDirectory] URLByAppendingPathComponent:dataFileName];
NSURL *iCloud = [fileManager URLForUbiquityContainerIdentifier:nil];
if (iCloud) {
NSLog(@"iCloud is working");
NSURL *iCloudLogsPath = [NSURL fileURLWithPath:[[iCloud path] stringByAppendingPathComponent:iCloudLogsDirectoryName]];
NSLog(@"iCloudEnabledAppID = %@",iCloudEnabledAppID);
NSLog(@"dataFileName = %@", dataFileName);
NSLog(@"iCloudDataDirectoryName = %@", iCloudDataDirectoryName);
NSLog(@"iCloudLogsDirectoryName = %@", iCloudLogsDirectoryName);
NSLog(@"iCloud = %@", iCloud);
NSLog(@"iCloudLogsPath = %@", iCloudLogsPath);
if([fileManager fileExistsAtPath:[[iCloud path] stringByAppendingPathComponent:iCloudDataDirectoryName]] == NO) {
NSError *fileSystemError;
[fileManager createDirectoryAtPath:[[iCloud path] stringByAppendingPathComponent:iCloudDataDirectoryName]
withIntermediateDirectories:YES
attributes:nil
error:&fileSystemError];
if(fileSystemError != nil) {
NSLog(@"Error creating database directory %@", fileSystemError);
}
}
NSString *iCloudData = [[[iCloud path]
stringByAppendingPathComponent:iCloudDataDirectoryName]
stringByAppendingPathComponent:dataFileName];
NSLog(@"iCloudData = %@", iCloudData);
NSMutableDictionary *options = [NSMutableDictionary dictionary];
[options setObject:[NSNumber numberWithBool:YES] forKey:NSMigratePersistentStoresAutomaticallyOption];
[options setObject:[NSNumber numberWithBool:YES] forKey:NSInferMappingModelAutomaticallyOption];
[options setObject:iCloudEnabledAppID forKey:NSPersistentStoreUbiquitousContentNameKey];
[options setObject:iCloudLogsPath forKey:NSPersistentStoreUbiquitousContentURLKey];
[psc lock];
[psc addPersistentStoreWithType:NSSQLiteStoreType
configuration:nil
URL:[NSURL fileURLWithPath:iCloudData]
options:options
error:nil];
[psc unlock];
}
else {
NSLog(@"iCloud is NOT working - using a local store");
NSMutableDictionary *options = [NSMutableDictionary dictionary];
[options setObject:[NSNumber numberWithBool:YES] forKey:NSMigratePersistentStoresAutomaticallyOption];
[options setObject:[NSNumber numberWithBool:YES] forKey:NSInferMappingModelAutomaticallyOption];
[psc lock];
[psc addPersistentStoreWithType:NSSQLiteStoreType
configuration:nil
URL:localStore
options:options
error:nil];
[psc unlock];
}
dispatch_async(dispatch_get_main_queue(), ^{
[[NSNotificationCenter defaultCenter] postNotificationName:@"SomethingChanged" object:self userInfo:nil];
});
});
return _persistentStoreCoordinator;
/*
if (_persistentStoreCoordinator != nil) {
return _persistentStoreCoordinator;
}
NSURL *storeURL = [[self applicationDocumentsDirectory] URLByAppendingPathComponent:@"X-Scan.sqlite"];
NSError *error = nil;
_persistentStoreCoordinator = [[NSPersistentStoreCoordinator alloc] initWithManagedObjectModel:[self managedObjectModel]];
if (![_persistentStoreCoordinator addPersistentStoreWithType:NSSQLiteStoreType configuration:nil URL:storeURL options:nil error:&error]) {
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];
}
- (void)saveContext{
}
@end
我正在尝试查看的视图控制器头文件
@interface SecondViewController : UIViewController {
UITableView *tblPickups;
UIBarButtonItem *btnClosedPickups;
UIBarButtonItem *btnAllPickups;
UIBarButtonItem *btnOpenPickups;
NSMutableArray * PickupArray;
NSMutableArray * PickupArrayAll;
UISearchBar *searchBar;
}
@property (nonatomic, retain) NSFetchedResultsController *fetchedResultsController;
@property (nonatomic, retain) NSManagedObjectContext *managedObjectContext;
@property (nonatomic, strong) IBOutlet UISearchBar *searchBar;
@property (nonatomic, strong) IBOutlet UITableView *tblPickups;
@property (nonatomic, strong) IBOutlet UIBarButtonItem *btnClosedPickups;
@property (nonatomic, strong) IBOutlet UIBarButtonItem *btnAllPickups;
- (IBAction)btnAllPickups_Clicked:(id)sender;
- (IBAction)btnOpenPickups_Clicked:(id)sender;
- (IBAction)btnClosedPickups_Clicked:(id)sender;
@property (nonatomic, strong) IBOutlet UIBarButtonItem *btnOpenPickups;
我的视图控制器主文件
#pragma mark TableView
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {
EditPickupView *firstViewController =[self.storyboard instantiateViewControllerWithIdentifier:@"EditPickupView"];
//[[EditPickupView alloc] initWithNibName:@"EditPickupView" bundle:nil];
DPickup * thepickup=[PickupArray objectAtIndex:indexPath.row];
firstViewController.thePickup=thepickup;
UIBarButtonItem *backButton = [[UIBarButtonItem alloc] initWithTitle:@"Update Pickups" style:UIBarButtonItemStylePlain target:nil action:nil];
self.navigationItem.backBarButtonItem = backButton;
//[scanItemViewController setIsEditing:NO];
//[scanItemViewController setIsListBased:NO];
[self.navigationController pushViewController:firstViewController animated:YES];
}
- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView {
return 1;
}
// Customize the number of rows in the table view.
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {
int rows=[PickupArray count];
return rows;
}
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
static NSString *CellIdentifier = @"Cell";
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
if (cell == nil) {
cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleSubtitle reuseIdentifier:CellIdentifier];
}
// Set up the cell
int therow=indexPath.row;
DPickup * currentItem= [PickupArray objectAtIndex:therow];
cell.textLabel.text=[NSString stringWithFormat:@"%@-%@-%@",currentItem.orderNumber,currentItem.clientCompany,currentItem.clientName];
cell.accessoryType=UITableViewCellAccessoryDisclosureIndicator;
return cell;
}
- (UITableViewCellEditingStyle)tableView:(UITableView *)aTableView editingStyleForRowAtIndexPath:(NSIndexPath *)indexPath {
return UITableViewCellEditingStyleDelete;
}
- (void)setEditing:(BOOL)editing animated:(BOOL)animated {
// Updates the appearance of the Edit|Done button as necessary.
[super setEditing:editing animated:animated];
[tblPickups setEditing:editing animated:animated];
}
- (void)tableView:(UITableView *)tableView commitEditingStyle:(UITableViewCellEditingStyle)editingStyle forRowAtIndexPath:(NSIndexPath *)indexPath {
//AppData *appdata=[AppData sharedInstance];
[tableView beginUpdates];
AppData *app=[AppData sharedInstance];
NSManagedObjectContext *context=[app managedObjectContext];
if (editingStyle == UITableViewCellEditingStyleDelete) {
DPickup *pitem=[PickupArray objectAtIndex:indexPath.row];
for(DPickup *itm in PickupArrayAll){
if(itm==pitem){
[PickupArrayAll removeObject:itm];
[PickupArray removeObject:itm];
break;
}
}
[context deleteObject:pitem];
[context save:nil];
[tableView deleteRowsAtIndexPaths:[NSArray arrayWithObjects:indexPath, nil] withRowAnimation:YES];
/*
DPickup *pitem=[PickupArray objectAtIndex:indexPath.row];
AppData* appdata=[AppData sharedInstance];
[appdata deletePickupItemsForPickup:[pitem getID]];
[appdata deletePickup:[pitem getID]];
[PickupArray removeObjectAtIndex:indexPath.row];
PickupArrayAll=[appdata readPickups];
[tableView deleteRowsAtIndexPaths:[NSArray arrayWithObjects:indexPath, nil] withRowAnimation:YES];
*/
}
[tableView endUpdates];
}
#pragma mark LifeCycle Functions
// Implement viewDidLoad to do additional setup after loading the view, typically from a nib.
- (void)viewDidLoad
{
id delegate = [[UIApplication sharedApplication] delegate];
self.managedObjectContext = [delegate managedObjectContext];
self.navigationItem.rightBarButtonItem = self.editButtonItem;
self.title=@"Update Pickup";
btnAllPickups.style=UIBarButtonItemStyleDone;
btnClosedPickups.style=UIBarButtonItemStyleBordered;
btnOpenPickups.style=UIBarButtonItemStyleBordered;
[[NSNotificationCenter defaultCenter] addObserver:self
selector:@selector(reloadFetchedResults:)
name:@"SomethingChanged"
object:[[UIApplication sharedApplication] delegate]];
[super viewDidLoad];
}
- (void)visewDidUnload {
[[NSNotificationCenter defaultCenter] removeObserver:self];
}
- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation
{
// Return YES for supported orientations
return 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.
}
- (void)viewDidUnload
{
[self setTblPickups:nil];
[self setSearchBar:nil];
[self setBtnClosedPickups:nil];
[self setBtnOpenPickups:nil];
[self setBtnAllPickups:nil];
[super viewDidUnload];
[[NSNotificationCenter defaultCenter] removeObserver:self];
// Release any retained subviews of the main view.
// e.g. self.myOutlet = nil;
}
-(void) viewDidAppear:(BOOL)animated {
AppData *appData=[AppData sharedInstance];
NSManagedObjectContext *context=[appData managedObjectContext];
NSFetchRequest *fetchRequest = [[NSFetchRequest alloc] init];
NSEntityDescription *entity = [NSEntityDescription
entityForName:@"DPickup" inManagedObjectContext:context];
[fetchRequest setEntity:entity];
NSError *error;
NSArray *fetchedObjects = [context executeFetchRequest:fetchRequest error:&error];
PickupArray=[[NSMutableArray alloc] initWithArray:fetchedObjects];
PickupArrayAll=[[NSMutableArray alloc] initWithArray:PickupArray];
//Pickups== [appData readPickups];
[tblPickups reloadData];
}
- (IBAction)btnSynchClicked:(id)sender {
AppData *app=[AppData sharedInstance];
[app.managedObjectContext mergeChangesFromContextDidSaveNotification:nil];
}
- (void)searchBar:(UISearchBar *)searchBar textDidChange:(NSString *)searchText
{
[PickupArray removeAllObjects];
for(DPickup* item in PickupArrayAll){
if([ [item.orderNumber uppercaseString] hasPrefix:[searchText uppercaseString]] || [searchText isEqualToString:@""])
[PickupArray addObject:item];
}
[tblPickups setScrollsToTop:YES];
[tblPickups reloadData];
}
- (IBAction)btnAllPickups_Clicked:(id)sender {
[PickupArray removeAllObjects];
for(DPickup* item in PickupArrayAll){
[PickupArray addObject:item];
}
[tblPickups setScrollsToTop:YES];
[tblPickups reloadData];
btnAllPickups.style=UIBarButtonItemStyleDone;
btnClosedPickups.style=UIBarButtonItemStyleBordered;
btnOpenPickups.style=UIBarButtonItemStyleBordered;
}
- (IBAction)btnOpenPickups_Clicked:(id)sender {
[PickupArray removeAllObjects];
for(DPickup* item in PickupArrayAll){
if([item.isPickedUp intValue]==0)
[PickupArray addObject:item];
}
[tblPickups setScrollsToTop:YES];
[tblPickups reloadData];
btnAllPickups.style=UIBarButtonItemStyleBordered;
btnClosedPickups.style=UIBarButtonItemStyleBordered;
btnOpenPickups.style=UIBarButtonItemStyleDone;
}
- (IBAction)btnClosedPickups_Clicked:(id)sender {
[PickupArray removeAllObjects];
for(DPickup* item in PickupArrayAll){
if([item.isPickedUp intValue]==1)
[PickupArray addObject:item];
}
[tblPickups setScrollsToTop:YES];
[tblPickups reloadData];
btnAllPickups.style=UIBarButtonItemStyleBordered;
btnClosedPickups.style=UIBarButtonItemStyleDone;
btnOpenPickups.style=UIBarButtonItemStyleBordered;
}
- (void)reloadFetchedResults:(NSNotification*)note {
NSLog(@"Underlying data changed ... refreshing!");
AppData *appData=[AppData sharedInstance];
NSManagedObjectContext *context=[appData managedObjectContext];
NSFetchRequest *fetchRequest = [[NSFetchRequest alloc] init];
NSEntityDescription *entity = [NSEntityDescription
entityForName:@"DPickup" inManagedObjectContext:context];
[fetchRequest setEntity:entity];
NSError *error;
NSArray *fetchedObjects = [context executeFetchRequest:fetchRequest error:&error];
PickupArray=[[NSMutableArray alloc] initWithArray:fetchedObjects];
PickupArrayAll=[[NSMutableArray alloc] initWithArray:PickupArray];
//Pickups== [appData readPickups];
[tblPickups reloadData];
}
@end
我很新，所以如果需要任何示例或更多信息，请告诉我。
谢谢！
答案 0 :(得分：1)
问题在于您尝试在nil上下文中获取特定类型（DPickup）的所有值。
此行很可能将上下文设置为nil
NSManagedObjectContext *context=[appData managedObjectContext]
您确定已正确设置AppData单身人士吗？