Property implementation error - ios

Question

Im following this tutorial:
http://www.raywenderlich.com/1845/ios-tutorial-how-to-create-a-simple-iphone-app-tutorial-part-2
I get the following errors:
1.Property implementation must have its declaration in interface "RWTDetailViewController"
2.Property "data" not found on object of type "id"
Here is my code:
#import "RWTScaryBugDoc.h"
#import "RWTScaryBugData.h"
#import "RWTUIImageExtras.h"
#import "RWTDetailViewController.h"
#interface RWTDetailViewController ()
- (void)configureView;
#end
#implementation RWTDetailViewController
#pragma mark - Managing the detail item
#synthesize picker = _picker;
- (void)setDetailItem:(id)newDetailItem
{
if (_detailItem != newDetailItem) {
_detailItem = newDetailItem;
// Update the view.
[self configureView];
}
}
- (void)configureView
{
// Update the user interface for the detail item.
self.rateView.notSelectedImage = [UIImage imageNamed:#"shockedface2_empty.png"];
self.rateView.halfSelectedImage = [UIImage imageNamed:#"shockedface2_half.png"];
self.rateView.fullSelectedImage = [UIImage imageNamed:#"shockedface2_full.png"];
self.rateView.editable = YES;
self.rateView.maxRating = 5;
self.rateView.delegate = self;
if (self.detailItem) {
self.titleField.text = self.detailItem.data.title;
self.rateView.rating = self.detailItem.data.rating;
self.imageView.image = self.detailItem.fullImage;
}
}
- (IBAction)titleFieldTextChanged:(id)sender
{
self.detailItem.data.title = self.titleField.text;
}
#pragma mark UITextFieldDelegate
- (BOOL)textFieldShouldReturn:(UITextField *)textField
{
[textField resignFirstResponder];
return YES;
}
#pragma mark RWTRateViewDelegate
- (void)rateView:(RWTRateView *)rateView ratingDidChange:(float)rating
{
self.detailItem.data.rating = rating;
}
- (IBAction)addPictureTapped:(id)sender {
if (self.picker == nil) {
self.picker = [[UIImagePickerController alloc] init];
self.picker.delegate = self;
self.picker.sourceType = UIImagePickerControllerSourceTypePhotoLibrary;
self.picker.allowsEditing = NO;
}
[self presentViewController:_picker animated:YES completion:nil];
}
#pragma mark UIImagePickerControllerDelegate
- (void)imagePickerControllerDidCancel:(UIImagePickerController *)picker {
[self dismissViewControllerAnimated:YES completion:nil];
}
- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info {
[self dismissViewControllerAnimated:YES completion:nil];
UIImage *fullImage = (UIImage *) [info objectForKey:UIImagePickerControllerOriginalImage];
UIImage *thumbImage = [fullImage imageByScalingAndCroppingForSize:CGSizeMake(44, 44)];
self.detailItem.fullImage = fullImage;
self.detailItem.thumbImage = thumbImage;
self.imageView.image = fullImage;
}
- (void)viewDidLoad
{
[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.
[self configureView];
}
- (BOOL)shouldAutorotateToInterfaceOrientation
{
return YES;
}
- (void)didReceiveMemoryWarning
{
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
When I move my #synthesize into the interface-declaration, I the the following error: "Illegal interface qualifier"
Can anyone help me?
Here is my .h-file:
#import <UIKit/UIKit.h>
#import "RWTRateView.h"
#interface RWTDetailViewController : UIViewController <UITextFieldDelegate, RWTRateViewDelegate, UIImagePickerControllerDelegate, UINavigationBarDelegate>
#property (strong, nonatomic) id detailItem;
#property (weak, nonatomic) IBOutlet UIImageView *imageView;
#property (weak, nonatomic) IBOutlet RWTRateView *rateView;
#property (weak, nonatomic) IBOutlet UITextField *titleField;
#property (weak, nonatomic) IBOutlet UILabel *detailDescriptionLabel;
#property (strong, nonatomic) UIImagePickerController *picker;
- (IBAction)addPictureTapped:(id)sender;
- (IBAction)titleFieldTextChanged:(id)sender;
#end

Answer 1

Error description is self explanatory, you need to declare picker as a property in interface(.h) file before you move to implementation(.m) file and synthesize it. However you don't need to synthesize properties anymore but if you do that is also fine.
One more thing, you missed the part from tutorial in which writer has declared this property in .h file already. You can have a look again or add this line to RWTDetailViewController.h
#property (strong, nonatomic) UIImagePickerController *picker;
EDIT
For second error you are declaring detailItem as an object of type id, however writer is using a custom class RWTScaryBugDoc in which he should be having a property named data. That's why you are getting the error as property data doesn't belong to id type. You may want to download the sample code at the end of tutorial and cross check the missing points.

Answer 2

You just need to declare your property first. So in the interface (h file or top of your m file), add:
#property (nonatomic, strong)UIImagePickerController *picker;
The #synthetise need to stay in the implementation.

Answer 3

You declare self.detailItem as Id. Id is no class and so it has no attribute, but you try to access self.detailItem.data.... This is not possible.
I can't help you to fix this, because there are so many logical erros in your code, that 99% of it makes no sense for me.