Ios 使用coredata将图像保存到设备

我的实体名为“Image”，属性为img（可转换），imgcode（字符串），我正试图将此图像与核心数据一起保存到我的设备中。但我有此错误，可能是什么问题？提前谢谢你

---

错误：“NSInvalidArgumentException”，原因：“无法合并名为“图像”的两个不同实体的模型。

将图像属性的类型设置为

NSData

，而不是可转换的。如果要获取图像，请使用

PNG

表示法获取

---

NSData*imageData=UIImagePNGRepresentation（tmpphoto）； NSManagedObject*image=[NSEntityDescription insertNewObjectForEntityForName:@“image”在ManagedObjectContext:context中]； 图像。图像=图像

- (IBAction)saveImage:(id)sender{

    AppDelegate *appDelegate = (AppDelegate *)[[UIApplication sharedApplication] delegate];
    NSManagedObjectContext *context = [appDelegate managedObjectContext];


    NSManagedObject *image = [NSEntityDescription insertNewObjectForEntityForName:@"Image" inManagedObjectContext:context];
                              images.image = image;

                              [image setValue:tmpphoto forKey:@"img"];

                               CGSize size = tmpphoto.size;
                               CGFloat ratio = 0;
                               if (size.width > size.height) {
                                   ratio = 90.0 / size.width;
                               } else {
                                   ratio = 90.0 / size.height;
                               }
                               CGRect rect = CGRectMake(0.0, 0.0, ratio * size.width, ratio * size.height);

                               UIGraphicsBeginImageContext(rect.size);
                               [tmpphoto drawInRect:rect];

                               images.imaget = UIGraphicsGetImageFromCurrentImageContext();

                               UIGraphicsEndImageContext();

}

我已经像这样改变了，我也有同样的问题。而且在数据模型中，我们没有NSData选项。对于图像，我们有Binarydata和Transformable选项

[image setValue:imageData forKey:@"img"];

CGSize size = tmpphoto.size;
CGFloat ratio = 0;
if (size.width > size.height) {
        ratio = 44.0 / size.width;
} else {
    ratio = 44.0 / size.height;
}
CGRect rect = CGRectMake(0.0, 0.0, ratio * size.width, ratio * size.height);

UIGraphicsBeginImageContext(rect.size);
[tmpphoto drawInRect:rect];
images.imaget = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();

---

通过这一点，我已经解决了我的问题。谢谢大家。

我不能对你问题的核心数据方面发表评论，但有两点意见：1。您可以使用或

uiimagejpegresentation

来检索图像，而不是使用图形上下文方法；2.图像（除非非常小，小于100kb）不适合存储在CoreData中。而且，当我注释这两行时，AppDelegate*AppDelegate=（AppDelegate*）[[UIApplication sharedApplication]delegate]；NSManagedObjectContext*上下文=[appDelegate managedObjectContext]；而不是NSManagedObject*image=[NSEntityDescription insertNewObjectForEntityForName:@“image”inManagedObjectContext:self.managedObjectContext]；正在执行此操作我的错误正在更改为entityForName:nil不是合法的NSManagedObjectContext参数搜索实体名称“Image”？？？

NSManagedObjectContext *context = [(AppDelegate *)[[UIApplication sharedApplication] delegate] managedObjectContext];
    if (!currentPicture)
        self.currentPicture = (ImageList *)[NSEntityDescription insertNewObjectForEntityForName:@"ImageList" inManagedObjectContext:context];

    if (imageview.image)
    {
        float resize = 74.0;
        float actualWidth = imageview.image.size.width;
        float actualHeight = imageview.image.size.height;
        float divBy, newWidth, newHeight;
        if (actualWidth > actualHeight) {
            divBy = (actualWidth / resize);
            newWidth = resize;
            newHeight = (actualHeight / divBy);
        } else {
            divBy = (actualHeight / resize);
            newWidth = (actualWidth / divBy);
            newHeight = resize;
        }
        CGRect rect = CGRectMake(0.0, 0.0, newWidth, newHeight);
        UIGraphicsBeginImageContext(rect.size);
        [imageview.image drawInRect:rect];
        UIImage *smallImage = UIGraphicsGetImageFromCurrentImageContext();
        UIGraphicsEndImageContext();

        NSData *smallImageData = UIImageJPEGRepresentation(smallImage, 1.0);
        [self.currentPicture setMyimage:smallImageData];
    }
    NSError *error;
    if (![context save:&error]){
        NSLog(@"Failed to add new picture with error: %@", [error domain]);}
    else
    {
        UIAlertView *AlertCampo = [[UIAlertView alloc] initWithTitle:@"
" message:@"Your image successfully saved into your device"
                                                            delegate:nil
                                                   cancelButtonTitle:@"OK"
                                                   otherButtonTitles:nil];
        [AlertCampo show];
    }