Paparazzi-Part 3

這作業原本預計一個禮拜完成，結果多花了一個禮拜。我想主要原因是 Core Data 的部份我不熟，在 Part 2 時草草帶過，使得 Part 3 時不得不好好研究一下。

　
Part 2 時對於 relationship 的用法不是很瞭解，這次重新設計了 Core Data 就好很多。


這裡值得注意的是經度緯度我在 Data Model 用的Type是 double 但產生出來的 Code 卻是 NSNumber 

@class Person;
@interface Photo : NSManagedObject 
{
}
@property (nonatomic, retain) NSNumber * longitude;
@property (nonatomic, retain) NSData * data;
@property (nonatomic, retain) NSNumber * watched;
@property (nonatomic, retain) NSNumber * latitude;
@property (nonatomic, retain) NSString * name;
@property (nonatomic, retain) id url;
@property (nonatomic, retain) Person * author;
@end

而要取值時： theCoordinate.longitude = [self.longitude doubleValue];
注意： MKAnnotation 並不是程式自己產生的，而是為了要讓 photo 直接有 location 的功能而加入的 delegate




另外，參考 More iPhone SDK 增加了 NSArray 的 Categories Set

@interface NSArray(Set)
+ (id)arrayByOrderingSet:(NSSet *)set byKey:(NSString *)key ascending:(BOOL)ascending;
@end 

值這樣就可以順利取出 photo set 了  (NSSet 轉 NSArray)

NSArray* array = [NSArray arrayByOrderingSet:thePerson.photos byKey:@"name" ascending:YES];

Flickr 從網路抓取圖片用作業提供的 JSON 和 FlickFetcher 來達成，此次作業用同步的方式來下載，所以會有點停頓。



之前我遇到的  Hierarchy NavigationBar 問題 其實很蠢 ＝＝
UIViewController 本身就有 navigationController 所以.... 不用這麼麻煩，下面的 code 很簡單就達成：

[self.navigationController pushViewController:photoDetailViewController animated:YES];

#pragma mark -
#pragma mark MKMapViewDelegate
// note: you can assign a specific call out accessory view, or as MKMapViewDelegate you can implement:
- (void)mapView:(MKMapView *)mapView annotationView:(MKAnnotationView *)view calloutAccessoryControlTapped:(UIControl *)control{
 //NSLog(@"%@",view.annotation);
 Photo* thePhoto = (Photo*) view.annotation;
 PhotoDetailViewController* photoDetailViewController = [[PhotoDetailViewController alloc] initWithNibName:@"PhotoDetailViewController" bundle:nil];
 //photoDetailViewController.url = thePhoto.url;
 photoDetailViewController.title = thePhoto.name;
 photoDetailViewController.photo = thePhoto;
 
 [self.navigationController setNavigationBarHidden:NO animated:NO];
 [self.navigationController pushViewController:photoDetailViewController animated:YES];
 [photoDetailViewController release];
}
- (MKAnnotationView *)mapView:(MKMapView *)theMapView viewForAnnotation:(id <MKAnnotation>)annotation
{
    // if it's the user location, just return nil.
    if ([annotation isKindOfClass:[MKUserLocation class]])
        return nil;
    
 static NSString* AnnotationIdentifier = @"AnnotationIdentifier";
 MKPinAnnotationView* pinView = (MKPinAnnotationView *)
      [self.map dequeueReusableAnnotationViewWithIdentifier:AnnotationIdentifier];
 if (!pinView)
 {
  // if an existing pin view was not available, create one
  MKPinAnnotationView* customPinView = [[[MKPinAnnotationView alloc]
              initWithAnnotation:annotation reuseIdentifier:AnnotationIdentifier] autorelease];
  customPinView.pinColor = MKPinAnnotationColorPurple;
  customPinView.animatesDrop = YES;
  customPinView.canShowCallout = YES;
  
  // add a detail disclosure button to the callout which will open a new view controller page
  //
  // note: you can assign a specific call out accessory view, or as MKMapViewDelegate you can implement:
  //  - (void)mapView:(MKMapView *)mapView annotationView:(MKAnnotationView *)view calloutAccessoryControlTapped:(UIControl *)control;
  //
  UIButton* rightButton = [UIButton buttonWithType:UIButtonTypeDetailDisclosure];
  //[rightButton addTarget:self
//      action:@selector(showDetails:)
//     forControlEvents:UIControlEventTouchUpInside];
  customPinView.rightCalloutAccessoryView = rightButton;
  
  return customPinView;
 }
 else
 {
  pinView.annotation = annotation;
 }
 return pinView;
 
}

Map 顯示也是比較不熟，主要是參考 Apple 範例程式修改 MapCallouts
有些照片沒有地理位置資訊，我就不知道他是怎麼判斷的了。
看起來很多圖片都是在同一個位置上。


主要是實作上面的兩個 delegates

要有 Scroll 功能記得要設 delegate

















剩下最後一個部份了  gogogogo!!