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写入我的 NSMutableDictionary“字典”时收到错误消息。

从我的项目列表类中实现（如下）时：

- (void)setImage:(UIImage *)i forKey:(NSString *)s
{
[dictionary setObject:i forKey:s];
// Create full path for image
NSString *imagePath = [self imagePathForKey:s];

// Turn image into JPEG data,
NSData *d = UIImageJPEGRepresentation(i, 0.5);

// Write it to full path
[d writeToFile:imagePath atomically:YES];
}

从 DetailViewController:imagePickerController:

- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info
{
NSString *oldKey = [_detailItem imageKey];

//did the item already have an image
if (oldKey) {
    //delete old image
    [[RoomList sharedStore] deleteImageForKey:oldKey];
}

//get picked image from info dictionary
UIImage *image = [info objectForKey:UIImagePickerControllerOriginalImage];

//create CFUUID object; it knows how to create uique identifier strings
CFUUIDRef newUniqueID = CFUUIDCreate(kCFAllocatorDefault);

//create string from unique identifier
CFStringRef newUniqueIDString = CFUUIDCreateString(kCFAllocatorDefault, newUniqueID);

//use unique ID to set our item's imageKey
NSString *key = (__bridge NSString *)newUniqueIDString;
[_detailItem setImageKey:key];
NSLog(@"image key: %@", key);

[_detailItem setImage:image forKey:key];

//tell objects ointed to by newUniqueIDString and newUniqueID to lose an owner to avoid
//memory leak
CFRelease(newUniqueIDString);
CFRelease(newUniqueID);

//remove image picker (dismiss method)
[self dismissViewControllerAnimated:YES completion:nil];
[self configureView];
}

我遇到了以下错误，它与 [_detailItem setImage:image forKey:key]; imagePickerController 中的操作： -[NSManagedObject setImage:forKey:]：无法识别的选择器发送到实例 0x8195770

我的猜测是 UIImage *image、NSString *key 或两者都无法传递给 objectForKey 方法“setImage:forKey”。有什么办法可以解决这个问题，或者绕过它？

谢谢！

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