Added loading property to FRPPhotoViewModel.

FRP/FRPPhotoViewController.m

@@ -51,11 +51,12 @@
     [self.view addSubview:imageView];
     self.imageView = imageView;
 
-    [[self.viewModel.didBecomeActiveSignal take:1] subscribeCompleted:^{
-        [SVProgressHUD show];
-    }];
-    [RACObserve(self.viewModel, photoImage) subscribeNext:^(id _){
-        [SVProgressHUD dismiss];
+    [RACObserve(self.viewModel, loading) subscribeNext:^(NSNumber *loading){
+        if (loading.boolValue) {
+            [SVProgressHUD show];
+        } else {
+            [SVProgressHUD dismiss];
+        }
     }];
 }
 

FRP/FRPPhotoViewModel.h

@@ -15,6 +15,7 @@
 @property (nonatomic, readonly) FRPPhotoModel *model;
 
 @property (nonatomic, readonly) UIImage *photoImage;
+@property (nonatomic, readonly, getter = isLoading) BOOL loading;
 
 -(NSString *)photoName;
 

FRP/FRPPhotoViewModel.m

@@ -15,6 +15,7 @@
 @interface FRPPhotoViewModel ()
 
 @property (nonatomic, strong) UIImage *photoImage;
+@property (nonatomic, assign, getter = isLoading) BOOL loading;
 
 @end
 
@@ -46,9 +47,14 @@
 #pragma mark - Private Methods
 
 -(void)downloadPhotoModelDetails {
+    self.loading = YES;
+    
+    @weakify(self);
     [[FRPPhotoImporter fetchPhotoDetails:self.model] subscribeError:^(NSError *error) {
         NSLog(@"Could not fetch photo details: %@", error);
     } completed:^{
+        @strongify(self);
+        self.loading = NO;
         NSLog(@"Fetched photo details.");
     }];
 }