如何将UIImage序列化为JSON？

我在用

imageData = UIImagePNGRepresentation(imgvw.image);

并张贴

 [dic setObject:imagedata forKey:@"image"]; 

后

NSData *data = [NSJSONSerialization dataWithJSONObject:dic options:NSJSONWritingPrettyPrinted error:&theError];

现在的应用程序崩溃终止应用程序由于未捕获的exception' NSInvalidArgumentException '，原因：'JSON写入中的无效types（NSConcreteMutableData）

Answer 1

您需要将您的UIImage转换为NSData，然后将该NSData转换为NSString，这将是您的数据的base64string表示forms。

一旦你从NSData获得了NSString *，你可以把它添加到你的字典中的key @“image”

要将NSData转换为base64types的NSString *，请参阅以下链接： 如何在iphone-sdk上执行base64编码？

在一个更伪的过程将是这样的

 UIImage *my_image; //your image handle NSData *data_of_my_image = UIImagePNGRepresentation(my_image); NSString *base64StringOf_my_image = [data_of_my_image convertToBase64String]; //now you can add it to your dictionary NSMutableDictionary *dict = [NSMutableDictionary dictionary]; [dict setObject:base64StringOf_my_image forKey:@"image"]; if ([NSJSONSerialization isValidJSONObject:dict]) //perform a check { NSLog(@"valid object for JSON"); NSError *error = nil; NSData *jsonData = [NSJSONSerialization dataWithJSONObject:dict options:NSJSONWritingPrettyPrinted error:&error]; if (error!=nil) { NSLog(@"Error creating JSON Data = %@",error); } else{ NSLog(@"JSON Data created successfully."); } } else{ NSLog(@"not a valid object for JSON"); } 

Answer 2

尝试这个

 NSData *imageData = [UIImageJPEGRepresentation(self.photoImageView.image, compression) dataUsingEncoding:NSUTF8StringEncoding]; 

 const unsigned char *bytes = [imageData bytes]; NSUInteger length = [imageData length]; NSMutableArray *byteArray = [NSMutableArray array]; for (NSUInteger i = 0; i length; i++) { [byteArray addObject:[NSNumber numberWithUnsignedChar:bytes[i]]]; } NSDictionary *dictJson = [NSDictionary dictionaryWithObjectsAndKeys: byteArray, @"photo", nil]; NSData *jsonData = [NSJSONSerialization dataWithJSONObject:dictJson options:0 error:NULL]; 

Answer 3

你可以转换你的形象在TI NSData像： –

如果PNG图像

 UIImage *image = [UIImage imageNamed:@"imageName.png"]; NSData *imageData = [NSData dataWithData:UIImagePNGRepresentation(image)]; 

如果JPG图像

 UIImage *image = [UIImage imageNamed:@"imageName.jpg"]; NSData *imageData = UIImageJPEGRepresentation(image, 1.0); 

你可以将它存储到CoreData中，就像这样对你有用：

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

你可以加载像： –

  NSManagedObject *selectedObject = [[self yourFetchCOntroller] objectAtIndexPath:indexPath]; UIImage *image = [UIImage imageWithData:[selectedObject valueForKey:@"image"]]; // and set this image in to your image View yourimageView.image=image;