将图像保存到核心数据 [英] Saving Image to core Data

问题描述

我是一个与核心数据相关的新手。任何一个可以帮助我提供适当的步骤/教程，显示如何保存图像到核心数据和其检索太。我可以存储字符串数据已经，但我的应用程序崩溃时，尝试保存图像。
用于保存：

I am a newbie related to core data. Could any one help me to provide proper steps/ tutorial showing how to save images to core data and its retrival too.I am able to store string data already, but my app crashes when trying to save image. For saving:

DataEvent *event = (DataEvent *)[NSEntityDescription insertNewObjectForEntityForName:@"DataEvent"
                                                          inManagedObjectContext:managedObjectContext];
NSURL *url2 = [NSURL URLWithString:@"xxxxxxxxxxxxxxx SOME URL xxxxxxxxxxxx"];

NSData *data = [[NSData alloc] initWithContentsOfURL:url2];
imageSave=[[UIImage alloc]initWithData:data];
NSData * imageData = UIImageJPEGRepresentation(imageSave, 100.0);    
[event setValue:self.imageSave forKey:@"pictureData"];

检索：

 DataEvent *event = (DataEvent *)[eventsArray objectAtIndex:indexPath.row];
 UIImage *image = [UIImage imageWithData:[event valueForKey:@"pictureData"]];
 UIImageView *imageViewMainBackGround = [[UIImageView alloc] 
 CGRect rect3=CGRectMake(0,2,100.0,100.0); 
 imageViewMainBackGround.frame = rect3;
 [cell.contentView addSubview:imageViewMainBackGround];
 [imageViewMainBackGround release];

推荐答案

保存：

NSData *imageData = UIImagePNGRepresentation(myUIImage);

[newManagedObject setValue:imageData forKey:@"imageKey"];

和
检索图片：

And To Retrive Image:

NSManagedObject *selectedObject = [[self fetchedResultsController] objectAtIndexPath:indexPath];
UIImage *image = [UIImage imageWithData:[selectedObject valueForKey:@"imageKey"]];
[[newCustomer yourImageView] setImage:image];

更改格式

这篇关于将图像保存到核心数据的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！