ios - 将图像从 UIimageView 保存到 Core Data

Question

我有一个“按钮”可以将相机胶卷中的图像加载到 imageView 中，效果非常好。现在我将图像保存在 imageView 我的数据库中。

我有 4 个“文本字段”，这没有问题。当我添加代码来保存“图像”时，应用程序崩溃了。

在 .h 文件中我有:

@property (weak, nonatomic) IBOutlet UIImageView *pictureData;

对于 UIImage。

我的.m 文件:

- (IBAction)save:(id)sender {
    NSManagedObjectContext *context = [self managedObjectContext];

    if (self.device) {
        // Update existing device
        [self.device setValue:self.nameTextField.text forKey:@"name"];
        [self.device setValue:self.versionTextField.text forKey:@"version"];
        [self.device setValue:self.companyTextField.text forKey:@"company"];
         [self.device setValue:self.adresse.text forKey:@"adresse"];
        [self.device setValue:self.pictureData forKey:@"picture"];



    } else {
        // Create a new device
        NSManagedObject *newDevice = [NSEntityDescription insertNewObjectForEntityForName:@"Device" inManagedObjectContext:context];
        [newDevice setValue:self.nameTextField.text forKey:@"name"];
        [newDevice setValue:self.versionTextField.text forKey:@"version"];
        [newDevice setValue:self.companyTextField.text forKey:@"company"];
        [newDevice setValue:self.adresse.text forKey:@"adresse"];
        [newDevice setValue:self.pictureData forKey:@"picture"];


    }

    NSError *error = nil;
    // Save the object to persistent store
    if (![context save:&error]) {
        NSLog(@"Can't Save! %@ %@", error, [error localizedDescription]);
    }

    [self dismissViewControllerAnimated:YES completion:nil];
}

在 xcdatamodeld(核心数据)中，我将图片作为二进制数据集类型!哪里出错了？

Answer 1

您应该保存其 image 属性，而不是保存 UIImageView。 This stack overflow question展示如何在 CoreData 中保存和检索 UIImage:

1)存储图像:

NSData* data = [NSData dataWithData:UIImagePNGRepresentation(yourUIImage)];
// save 'data' to core data

2) 载入图片:

// retrieve data from core data as per usual, stored in 'data'
UIImage* image = [UIImage imageWithData:data];