我完成了我的应用程序的开发,但是当我尝试将图像保存在核心数据中时,我遇到了随机崩溃。
这是控制台消息:
CoreData:错误:严重的应用程序错误。在核心数据更改处理期间捕获到异常。这通常是 NSManagedObjectContextObjectsDidChangeNotification 观察者中的一个错误。-[_PFExternalReferenceData compare:]:无法识别的选择器使用 userInfo (null) 发送到实例 0x94b69b0
问题是它是不确定的。它在 5 次中或多或少地发生一次。
有人知道我应该在哪里寻找吗?
编辑:
这是我班级的代码,似乎有问题。当我点击保存按钮时,有时会发生这种情况,调用 -(IBAction)saveResultingImage:
#import "ResultViewController.h"
@interface ResultViewController ()
@property (nonatomic)BOOL resultSaved;
@end
@implementation ResultViewController
#pragma mark - IBActions
- (IBAction)saveResultingImage
{
UIGraphicsBeginImageContextWithOptions(self.view.bounds.size, NO, 0.0);
[self.view.layer renderInContext:UIGraphicsGetCurrentContext()];
_resultImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
_resultSaved = [self saveOnCoreData];
[self performSegueWithIdentifier:@"BackToStartSegue" sender:self];
}
- (IBAction)discardWithoutSaving
{
[self performSegueWithIdentifier:@"BackToStartSegue" sender:self];
}
- (IBAction)restartDrawing:(id)sender
{
UIImage *backgroundImage = _subImage;
UIImageView *imageView =
[[UIImageView alloc] initWithFrame:CGRectMake(0, 0, backgroundImage.size.width, backgroundImage.size.height)];
imageView.image = backgroundImage;
[self.view addSubview:imageView];
UIImage *maskImage = _maskImage;
CGRect maskViewRect = CGRectMake(0, 0, maskImage.size.width, maskImage.size.height);
ImageMaskView *subView = [[ImageMaskView alloc] initWithFrame:maskViewRect image:maskImage];
[self.view addSubview:subView];
}
- (IBAction)showExplainVC
{
[self performSegueWithIdentifier:@"ShowInfoSegue" sender:self];
}
#pragma mark - Methods
- (BOOL)saveOnCoreData
{
NSManagedObjectContext *context = [self managedObjectContext];
NSManagedObject *newMeme =
[NSEntityDescription insertNewObjectForEntityForName:@"Meme" inManagedObjectContext:context];
NSData *toSaveMeme = UIImagePNGRepresentation(_resultImage);
[newMeme setValue:toSaveMeme forKey:@"image"];
NSError *error = nil;
if (![context save:&error]) {
DebugLog(@"Can't save: %@ %@", error, [error localizedDescription]);
return NO;
}
return YES;
}
#pragma mark - View Controller LifeCycle
- (BOOL)shouldPerformSegueWithIdentifier:(NSString *)identifier sender:(id)sender
{
if ([identifier isEqualToString:@"BackToStartSegue"]) {
return _resultSaved;
}
return _resultSaved;
}
- (void)viewWillAppear:(BOOL)animated
{
[super viewWillAppear:animated];
[self.navigationController setNavigationBarHidden:NO];
DebugLog(@"Called viewWillAppear");
self.navigationController.navigationBar.barStyle = UIBarStyleBlack;
}
- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
if (self) {
// Custom initialization
}
return self;
}
- (void)viewDidLoad
{
[super viewDidLoad];
UIBarButtonItem *discardBarButtonItem =
[[UIBarButtonItem alloc] initWithTitle:@"Discard" style:UIBarButtonItemStylePlain target:self action:@selector(discardWithoutSaving)];
UIBarButtonItem *saveBarButtonItem =
[[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemSave target:self action:@selector(saveResultingImage)];
UIBarButtonItem *infoBarButton =
[[UIBarButtonItem alloc] initWithTitle:@"How to" style:UIBarButtonItemStylePlain target:self action:@selector(showExplainVC)];
discardBarButtonItem.style = UIBarButtonItemStyleBordered;
self.navigationItem.rightBarButtonItems = @[saveBarButtonItem, discardBarButtonItem, infoBarButton];
self.view.backgroundColor = [UIColor blackColor];
[self restartDrawing:nil];
}
- (void)didReceiveMemoryWarning
{
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
#pragma mark - Core Data Stack
- (NSManagedObjectContext *)managedObjectContext
{
NSManagedObjectContext *context = nil;
id delegate = [[UIApplication sharedApplication] delegate];
if ([delegate performSelector:@selector(managedObjectContext)]) {
context = [delegate managedObjectContext];
}
return context;
}
@end
感谢您的兴趣:-)