保存圖像設備與coredata

- (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(); 

}

我的實體名稱爲「圖像」與屬性IMG（變形），imgcode（串），我嘗試這個圖像保存到我的設備與核心data.But我有這個錯誤，是什麼可以是問題嗎？預先感謝您...保存圖像設備與coredata

錯誤：「NSInvalidArgumentException」的，理由是：圖片「

來源

2012-12-06 santa

我不能評論你的問題的核心數據方面，但有兩點意見：1.你可以使用['UIImagePNGRepresentation']（http://developer.apple.com/library/ios/documentation/uikit/reference /UIKitFunctionReference/Reference/reference.html#//apple_ref/c/func/UIImagePNGRepresentation）或'UIImageJPEGRepresentation'來檢索圖像，而不是圖形上下文方法; 2.圖像（除非非常小，小於100kb）不適合存儲在CoreData中。 – Rob

並且當我評論這兩行時 AppDelegate * appDelegate =（AppDelegate *）[[UIApplication sharedApplication] delegate]; NSManagedObjectContext * context = [appDelegate managedObjectContext]; 而不是這些行 NSManagedObject * image = [NSEntityDescription insertNewObjectForEntityForName：@「Image」inManagedObjectContext：self.managedObjectContext];我做這個我的錯誤正在改變爲entityForName：nil不是合法的NSManagedObjectContext參數搜索實體名稱'圖像'??? – santa

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]; 
    }

有了這個，我已經解決了我的problem.Thanks爲大家NSData的選項there.Binarydata和Tranformable選項。

來源

2012-12-11 07:56:36 santa

集型的你像財產NSData而不是變形」無法與命名兩個不同的實體合併模型「和當你想獲得圖像時，請使用PNG表示。

see this

來源

2012-12-06 08:55:54 aahsanali

的NSData *的imageData = UIImagePNGRepresentation（tmpphoto）;我們可以看到NSManagedObject * image = [NSEntityDescription insertNewObjectForEntityForName：@「Image」inManagedObjectContext：context]; images.image = image;

[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();

我已經改變了這個，我也有同樣的問題。而也是在數據模型我們沒有，我們有圖像

來源

2012-12-06 09:31:10 santa

保存圖像設備與coredata

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